TEL -TECH & Electronic Industries
Printed le Circuits i for Deflection Yokes
Fusion Transistors Silicon COPY! Glow Transfer Tubes in Counting Circuits THIS SHARE ro Piccsc Roule
December 1954 Another RMC First
DISCAPS for printed wire circuits
The exclusive wedge design of the leads on these new DISCAPS lock them securely in place on printed circuit assemblies prior to the soldering operation. The "Wedg-loc" leads eliminate the possibility of the capacitors becoming loose or falling out. Application of "Wedg-loc" lead DISCAPS to your printed circuits will cut production time, reduce costs, and insure the uniformity of your soldered connection. RMC "Wedg-loc" in between .01 DISCAPS are available capacities 2 MMF and 10,000 MMF in temperature compensating, by-pass, and stable capacity types with lead spacing as shown above. Electrical specifications and tolerances RMC are the same as standard wire lead DISCAPS. Your 200 inquiry is invited.
II ANOTHER NEW DEVELOPMENT FROM THE RMC TECHNICAL CERAMIC LABORATORY
DISCAP RADIO MATERIALS CORPORATION CERAMIC CAPACITORS GENERAL OFFICE: 3325 N. California Ave., Chicago 18, III. FACTORIES AT CHICAGO, ILL. AND ATTICA, IND. Two RMC Plants Devoted Exclusively to Ceramic Capacitors & Electronic Industries
DECEMBER, 1954
FRONT COVER: PRINTED CIRCUITS FOR DEFLECTION YOKES-Closeup view of new printed circuit crossed field type coil developed by French designers. These yokes reportedly developed the same deflection as con- ventional ferrite cored types. See page 82 for additional details. Use of printed circuits throughout the elec- tronic industries is growing by leaps end bounds. One foil -clad laminate manufacturer predicts that each TV set will eventually require a pound of clad -laminate stock. Radio sets, computers, hearing aids, office equip- ment, automatic signaling devices, hi-fi units are other areas of application now under development.
Totals: U. S. Foreign Electronic Exports 3
As We Go To Press 13
It's Later Than You Think 71 Radarscope: What's Ahead for the Electronic Industries 72
A Universal Printed Circuit J R Goodykoontz 74 Recent Developments in Silicon Fusion Transistors R. A. Gudmundsen, W. P. Waters, A. L. Wannlund, and W. V. Wright 76
Page from an Engineer's Notebook Joseph F. Sodaro 79 No. 29-Printed Circuit Capacitor Design Limitations of Voltage Doubling Method in Rating Instruments ... H. B. Conant 80 Printed Crossed -Field Deflecting Coils A V J. Martin 82 Glow Transfer Tubes for Counting Circuits Philip Cheilik 84 Subharmonic Crystal Oscillator 86
Gain -Stabilized l -F Transformers John F. Clemens 87
Design for a Printed Subminiature I -F Amplifier B Raboy & J. R. Endicott 88
Transistor Frequency Standard 1 H Smith, Jr. & Mark Campbell 90 Cues for Broadcasters 92 Behavior of Electronic Equipment in Vehicular Transportation G. K. Guttwein, F. K. Priebe and S. M. lee 94 How to Prepare Printed Circuit Artwork Jack Bayha 97
New Abrasive Process Speeds Component Production Robert R. Gretter 98 Printed Circuits: Soldering Techniques 75 On Copper -Clad Laminates 104 On Automatic Chassis Production 116
DEPARTMENTS
Books 64 Letters 48 Personal 124 Bulletins 128 Military Contract Awards 118 Tele Tips 24 Coming Events 18 New Equipment 100 Washington News Letter 108 Industry News 56 News of Manufacturers Reps 131
TELE -TECH & ELECTRONIC INDUSTRIES", Vol. 13, No. 12. Published monthly by Caldwell -Clements, Inc. M. Clements, President; M. H. Newton, Assistant to President; John J. Borghi, Vice President and Secretary; M. B. Clements, Treasurer. Acceptance under section 34.64 Postal Laws and Regulations authorized at Bristol, Conn., June 9, 1954. Additional acceptance at New York, N. Y. 750 a copy. Subscription Rates: United States and U. S. Possessions: I year, $5.00; 2 years $8.00; 3 years $10.00. Canada: 1 year $7.00; 2 years $11.00; 3 years $14.00. All other countries: 1 year $10.00; 2 years $16.00. Please give title, position and company connections when subscribing. Copyright by Caldwell -Clements, Inc., 1954. Printed in U.S.A.
CALDWELL-CLEMENTS, Inc. Reg. U. S. Pat. Off. Publication Office, Bristol, Conn. Editorial/Business Offices 480 Lexington Ave., New York 17, N. Y., Tel. Plaza 9-7880
TELE -TECH & ELECTRONIC INDUSTRIES December 1954 1
MODEL TCR-12
A NEW MICROWAVE SYSTEM Engineered for Reliable Service at Low Cost INDUSTRIAL BAND and COMMON CARRIER BAND Applications (6575-6875 mc) (6250-6425 mc)
Marking a big step forward in microwave economy, reliability and ease of installation, Raytheon pre- RELIABLE, LOW COST MICROWAVE sents the Model TCR-12 TELELINK. Available for one SERVICE FOR or two channel operation, TELELINK is particularly PIPELINES PUBLIC WORKS applicable for handling telephone, telemetering, POWER UTILITIES FIRE AND POLICE teletype, telegraph, control and VHF functions. TELEPHONE COMPANIES AIRLINES TURNPIKES RAILROADS HIGHWAYS FORESTRY UNITS. SINGLE -PACKAGE Completely self-contained MILITARY AND CIVIL DEFENSE including built-in parabolic antenna and all-weather radome, TELELINK units are quickly and easily in- stalled on poles or towers and may be used with passive DETAILED INFORMATION ... a new brochure contains reflectors. TCR-12 repeater units permit multi -hop complete data on the new Raytheon TELELINK. Write for it. systems.
Simple, compact, rugged, designed for trouble -free, unattended operation in all weather, TELELINK features long -life circuits and automatic self-tuning after power failures or maintenance shut -downs. Op- erates on standard utility power.
PRINTED CIRCUIT TECHNIQUES . . . First to use RAYTHEON MANUFACTURING COMPANY strip line plumbing with printed circuit techniques, Raytheon Equipment Soles Division TELELINK incorporates latest design features for reliability, economy, compactness, and servicing ease. WALTHAM 54, MASSACHUSETTS
1954 2 For product Information, us* Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December ONP.O..-NONMONO..OmNmmNmONNONMMO'ONNaO.NNOMOMOMm.M'O.OPNP.ON'OmN.NPNP mP.O-NaOPOMMNN.mNP NMM N PO O.N'ONOMN NNO' .-N .NOO'*N" N^ m O M O P'OOPO M m m O '*PON'* ' O C MON .'O ON .N'OPPMNNP .'ON'O .N .N .NPmNP'OMM .N -0^O ..N -'ON . .MPN ."NON .N 00O d00 -O NN NO'*m'OOON .NNN 0 d --MONMmN'O .NNNNN M^ONO' .- .m'OONN N 'ÒO ' 'P 'ON:NNi N 'hNiÓ ' 'N! ' ^VÑh'Ó- 'LV ". ÿ<.O. N. .^ :M . ¡ N . -- N.- :N^N1V. 'á ' Ó7 ' ^. 'O . . . . M . a . M . - 'O , .. . N Mw N )j42 O.- 0. -NO OmVOoON NO MP 'O^MNOO NmP 000NPN'*'*MO0 NO'OP Nm-'ONOO .O.- . .mNmN .N9NPN.NN . .NO . .MM .NNOmPO .NNN .ON'OmONmO'ON'O . .O'O.P . .PM'ONOP. 'NP . E Ó NPmN NO'ONdNN Me . ON -OhMNmN NON ^NOON'ONmhNN . NOON . .NPOO-MN 1 O C :NP ' ''ÓNC6N 'NN@1L7N)V ' 'Lh ' 'p 'N.v1NìN 'q^^ .p¡^NN N/1N ' 'MNNO ' .NP'OMm'O úU . 'O M .N . . m C .- Ñ : : . . . d. : N ^M : -'N : . . N NM è ^ O a O mO 'OOm'ON -'O. MN'* 'O NN m ^ O. 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O N .- mee a0'*mP M O.Om 00a0 0 0M ON NN N. -NO N MN N 00 60.Ó NI 'M ow .NPd'O N PNmN 'Om" NN m'O 'NN 'mMNN . N) 'NN O Nm Ó E ' 'O a V m 'NNN 'MNhPN 'n ''OMN.- PPNN ' 'N'O 'ON ' 'O. 'NN ' NNON' ' 'O '.N ''O 'NO 0.00 .O ..N .O NNÑ .O ..-Ó.ÓÑ . N f7 : .N . :N1'Ó :m .tV'ÓfV .th :Ni ^M . . . LrLLV .N ...... N N ...... M . . w .--N ' O 'O-m'O. O . 00 O'ON mNN ame 'O NPOMN'* O -Mm N m.m O M 41' ^ N 'm NaN'OO em NN- m'ON mamac,'O OmMNON N'O.P ''O NOa N M ' ''O O .- 'M -MOM 'Nd 'ONm 'mNN 'M ''OmMNhN ' ''ONNO 'N O Pm. 'O 'PMm O e O . .N .N . . .OMN .NO.- .00mOP .'O . OMP .NNP .-O .N-- . M .NON . co . . . . .N . ,me . . . .M . . .N -'O . -N .. N ..- ... .M .. m . . . ..^ 'O at w - ^ p..: .PNOO NO.NOdMP .ON .-aNOON NM da -0 NNNO NN NaN..NNO '*Oma PNO . NMNON . . F ^mdNdNmd .dda ..NOO-N .PN .01. -OP .MN^0 'CO. .NNPMONmN . .NddP .000 OPmON . OZa OaPm.-O'OM NNN .OmmdPO -m. .NIOa .PN^N ..N .'*OdMPmmN . .OMMm .mNd .NLVPMNN m .MÑNi :ÑNi .- 'ÒM 'PN ' :PNN . PdMPNNichN pE Q -" c'' . : . ' R^^ - . . h0^ LY. K W O N M'O M ' N . . N . < V o m LL u "Cl.)v W < : m . O ...... : Z OOZ -e « OW O J L < OC .( . : . . . . .QQ : :Z< OO Oo gu :: :Z< Y TELE -TECH & ELECTRONIC INDUSTRIES December 1954 3 s The Color -TV Film Camera that outmodes alt other approaches *TP-EBZ 1 5mm Prcfessio iJl F IT P1( ..r101 *TK -26A 3 -Vidicon =ilm CCI c -TP-3B DtSec 2 [ 2 D J al Slide Projector *TP -12 M t pexer *TP-6BC 16mm Professi t -ol Film Projector NEW SIMPLIFIED UNMATCHED NEW, EASY EMPLOYS STANDARD DESIGN PICTURE QUALITY MULTIPLEXING TYPE PROJECTORS TK -26A Film Camera Sys- RCA TK -26A use: 3 small, Resolution and stability are un- As simple and straightfo.-avard RCA's The type inexpensive Vidicon cameras to matched by any other approach. as any monochrome arrangement, tem works with standard as the handle red, green, and blue in- Gamma is ideal-needs virtually the TK -26A includes all facilities television projectors such no correcnon. Color fidelity needed for color fi£et program- RCA TP-6BC. You get ample dividually (see diagram) -and a films-and fixed lens-and-dichroic mirror sys- equals the high -quality standards ming - slides, film, and multi- light to handle dense set by RCA's studio color camera. plexer. You can iarserchange at the same time you avoid com- tem-for handling color separa- in- tion. Electronic control assures Exceptional stability and praise slides, and 16- and 35 -mm film- plicated projector equipment the three picture registration are character- just like you do with blade and volvin,g moving optical parts. precise registration of operates with cameras for day -in, day -out opera- istics that assure simplicity and white. RCA's equipment "station tested" reliability. tion. Here is the color film system ease of operation and a minimum that not only handles 16- and of maintenance. Ample reserve 35 -mm motion picture him-but of light assures best possible pic- slides as well! tures from the densest of films. 1112"91 NOW, "STUDIO REALISM" IN COLOR RN= -WITH 16MM, 35MM 111 BEIM COLOR FILM AND SLIDES The search for high quality in a Color -TV film and slide camera is ended! After several years of intensive work with almost every conceivable approach to color film and slide reproduction, RCA Broadcast Design Engineers have now produced a superior film camera system matched by no other. This is the color film system that has outperformed ... flying -spot scanners ... fast pull -down systems continuous motion arrangements ... in actual side -by -side tests at the RCA Engi- *Close-up view of the neering Laboratories. This is the color film system that RCA TK -26A -- RCA's remark- -spot scanner." able 3-V Color Film Cam- has now adopted over its own previous "flying era. Heart of the 3-V is the For complete technical information on the TK-26A-the revolutionary new, in- remarkable RCA 3 -Vidicon color film camera that outmodes expensive Vidicon Camera Sales Repre- tube- RCA -6326! all other approaches-call your RCA Broadcast sentative. In Canada, write RCA Victor Ltd., Montreal. Important for Station Men-new brochure on RCA's 3 -Vidicon Camera Chain. Free, from your RCA Broadcast Sales Representative. RCA Pioneered and Developed Compatible Color Television How It Works! croic _r_irrars and color fi ters "split" the light into three valor Light from- either one of three conpenents-green, red, and l -lue. selected _olcr p_ct.1re projectors Each color component produces passes inm the 3-t Multiplexer. a VIDEO s_gaal in a separate A remo:e.y-ooncrolled mirror ar- Vidicon camera. Videc ou_pa: rangement reflects the interning from each camera then goes into image th-ough s hid lens and ne Processing Amplifier in tie into the 3-t Camera. Here, di - csnera control unit. 16mm_;. FILM 3-'.IeICON CAMERA P2olECtOR 3-V CICOn UICC MtJL7I2LE.(ER 2AMEtP ;CRffil) rKNIRaIC INC. S I VIDEO DICiRDI- 1 N]. OUTPUTS VIC7CON í 4 2r2 TO :AMERA 2 (FE)I Tp PROCESSING ` D CNROIC D CNRDIC AMPLIFIER NC.. No. I V DCON CAl/LOS a -I BLU) 1El- I.... MIRRORS rmi EN 11 surnien FRofQCIF MIMI ILwrPlideolge !!!!"elleriMMIZI 811111111161=1 mor...wifflowd am m%guimin% Iran TELE -TECH & Electronic Industries M. CLEMENTS DR. O. H. CALDWELL Publisher Editorial Consultant BERNARD F. OSBAHR ALBERT J. FORMAN Editor Associate Editor DR. A. F. MURRAY JOHN H. BATTISON Contributing Editor Contributing Editor B. V. SPINETTA, Directory Editor MARTHA USDIN, Assistant Editor CARL THOMAS, Assistant Editor R. C. DAVIES, Washington News Editor CHARLES F. DREYER, Art Director GAIL CARLSON, Editorial Secretary Lt. Col. STANLEY GERSTIN, Contributing Editor BUSINESS DEPARTMENT M. H. NEWTON, Business Manager HOWARD A. REED, General Sales Manager PAUL J. CARNESE, Sales Promotion Manager JOSEPH DRUCKER, District Manager JAMES S. COLEMAN, Asst. Sales Manager N. McALLISTER, Asst. Business Manager CECILIA KAVANAUGH, Advg. Records A. SHILLIN, Production Manager 480 Lexington Ave., New York 17, N.Y. Telephone Plaza 9-7880 S. M. GASKINS, Western Manager JOHN D. LUPTON, District Manager New Shalicross "12000 Series" 201 N. Wells St., Chicago 6, III. Oval Ceramic Switches offer Telephone RAndolph 6-9225 "custom-built" quality - without CHRIS DUNKLE & ASSOCIATES the delay and cost California Representatives of specials. 3257 W. 6th Street, Los Angeles 5, Calif. Telephone DUnkirk 7-6149 With only a few basic inter- 1651 Market St., San Francisco 3, Calif. changeable parts, Telephone UNderhill 3-5282 constantly Shallcross 12000 Series stocked by Shallcross, 1000 over Oval Ceramic Switches ELMER DALTON, Circulation Manager different switch types can be JOHN J. BORGHI, Controller -SHORTING quickly assembled. Delivery is im- NON ACTION - 40° or 60° indexing mediate. Your specifications are matched exactly. SHORTING ACTION -20° or 30° in- CIRCULATION 22,000 dexing B The use of solid silver contacts DETENT-Optional. Positive -acting PA wheel and collector rings, low-loss stea- star type. TELE -TECH & ELECTRONIC INDUSTRIES is decks, edited for top-level engineers and execu- tite and silver plated beryl- POLES PER DECK -1, 2, or 3 ives throughout the electronic industries. It gives the busy engineering executive lium -copper wiper pressure springs and NUMBER OF DECKS-Up to 10 decks outhoritative information interpretation assures uniformly low contact re- of the latest developments and new products, may be ganged. with emphasis on subjects of engineering sistance and exceptional durability import and timeliness. Special attention is ADJUSTABLE STOP Available on given to: for a wide variety of instrument - order switching applications. MANUFACTURING SHAFT-Completely isolated -Electronic equipment, communications, broadcasting, microwave relay, instru- For complete information mentation, telemetering, computing. on CONTACT RESISTANCE -0.0025 ohm, -Military equipment including radar, "12000 Series" Switches, write, ±0.0002 ohm sonar, guided missiles, fire controls. -TV-FM-AM receivers, phonographs, reproducers. wire, or phone for Shallcross Engi- RATINGS-110 v., la., 60 cy.-nominal. recorders, neering Bulletin L-32 which cata- 2500 v., 60 cy.-de-rated current. OPERATION logs 275 of the most popular types. 40 amps-de-rated voltage. -Fixed, mobile and airborne communi- cations in commercial, municipal, avi- SHALLCROSS MFG. CO., 518 Complete specifications in ation and government services. Bullein L-32. -Broadcasting, Color TV, video and audio Pusey Avenue, Collingdale, Pa. recording, records, audio and sound sys- tems, motion picture production. -Military, civilian and scientific elec- tronic computing and control systems. -*Req. U. S. Pat. OR. THE ELECTRONIC INDUSTRIES DIRECTORY Published annually as an integral Shall cross section of TELE -TECH in June 6 For product information, use inquiry card on last page. TELE-T:CH & ELCCTRONIC INDUSTRIES December 1954 LAN? SPECIFIED LENGTH .020"WALL 13/4" 70 3-1/8" INCLUSIVE 1, mefr'retet: NOTE-: .283" ±.003" INTERNALLY THREADED I/4"-28 AND EMBOSSED TO PROVIDE 1'T06' OZ. RUNNING TORQUE WITH I/4"-28 MPA STANDARD SHALLOW THREAD CORE AS DETAILED BELOW : THE FOLLOWING MPA STANDARD CORE THREAD FORM DRAWING AND DIMENSION CHART IS THE RECOMMENDATION OF THE CLEVELAND CONTAINER CO. FOR USE WITH TORKRITE COIL FORMS CORE LENGTH CORE O.D. 3/8' .249" *_.001" 1/2" .248' ±.001 5/8" .248" *.001" 3/4" .247" ±.001" 7/8" .247"±.001" I" .246"±.001" .012" MAX. 0.0357" PITCH BY THE MAKERS OF CLEVELITE* PHENOLIC TUBING Torkrite coil forms eliminate torque and stripping problems and are rapidly replacing other coil forms because Torkrite: withstands more than required strip- has no holes or perforations thru tube ping pressure. wall which eliminates cement leakage locking cores. requires no revision other than re- duced winding arbor diameter. has smooth adjustment of core without is round and concentric; winds coils at lubricant. higher speed without wire breakage or fallen turns. torque increases less after winding as heavier wall reduces any tendency to permits use of lower torque since it is collapse and bind core. completely independent of stripping pressure. maximum stability results as core can- recycling ability is unmatched. not move in relation to winding after peaking as it is engaged in internal is stronger mechanically because of threads. heavier wall. provides 1-6" oz. running torque when embossings are evenly spaced, with a used with MPA standard shallow thread lead at each end of the form to permit core. easy insertion of core. INVESTIGATE this outstanding coil form. Why pay more? For good Quality *Reg. U. S. Pat. Off. ... Call CLEVELAND! * * * Improved new Torkrite is 6 CLEVELAND CONTAINERÓ T now available in various di- ?h 6201 BARBERTON AVE. CLEVELAND 2, OHIO Win... Ogd.nsburg, N.Y. Jamesba%B, N. J. PLANTS AND SALES ONICES at Chicago, De nelt, Memphis, Plrnnovtl% ameter tubes. Lengths from ABRASIVE DIVISION at Cleveland. Ohle Container, Canada. Ltd., Pr.catt, Ontario 3/4" to 3-1 /8" are made to CANADIAN PLANT t The Cleveland fit 8-32, 10-32, 1/4-28 and REPRESENTATIVES N.J. NEW YORK AREA R. T. MURRAY, 604 CENTRAL AVE. EAST ORANGE, HARTFORD, CONN. 5/ 16-24 cores. NEW ENGLAND L S. ETTIOREW & CO., 62 LA SALLE RD., WEST AVE. CHICAGO CHICAGO AREA PLASTIC TURING SALES, S215 N. RAVENSWOOD S ALVARADO ST., LOS ANGELES * * * WEST COAST IRV. M. COCHRANE CO., 408 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 7 CORPORATION 363 EAST 75th STREET CHICAGO 19 PERFORMANCE GUARANTEED*SYSTEMS FEATURING VSWR low enough for color television New Andrew copper clad steel waveguide Andrew UHF Coaxial line Andrew high efficiency Steatite line for VHF Andrew transmission systems for today's TV will not be obsoleted by tomorrow's colorcasting- * Our high technical standards are backed by a 20 year record of accepting systems responsibility, and we invite you to write for a copy of our guarantee policy. Andrew will design and engineer a complete system for your station now -and accept a contingent order to be placed through your transmitter manufacturer at a later date. Oos' g For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES De:asrmser 1?54 the KEY NX to your problem metal -cased ph a®asst st ronn the NEW LOOK .n MULTIMETERS to pka©strop co. SO. PASADENA SCALIF., U S. A. 1vO0 Y GP PI D.C. A.C.V. 1.5 V.A.C. 3 4 5 .04 1 3 9 5 4 1 .0 6 ODI= 1.73Y. 500A LINE POCKET SIZE WITH A 47/8" LENGTH SCALE the KEYS WE LEAVE IT TO YOU to your problems WOULD YOU BUY A PLASTIC -CASED WRIST WATCH ... rha©st ron AC CURRENT RANGES if you could buy the finest movement in a magnetically shielded metal case? rkaQst ron ANTI -MAGNETIC . . . DOUBLY SHIELDED Phaostron, world famous manufacturer of ENVIRON- MENT FREE PRECISION AIRCRAFT EQUIPMENT for Mili- tary and Industrial uses introduces a new concept in Multimeters. This magnetically shielded, metal -cased rha©st ron LARGE SCALES ... COLOR CODED "555" compares with plastic -cased multimeters as a fine watch in a precious metal case would compare with a plastic wrist watch. rha©st ron SIMPLICITY ... ONLY 2 JACKS The shielded, shatterproof and anti -magnetic case in- sures continued accuracy and integrity of this instru- rhaQstron ACCURACY 2% DC, 3% AC ment for years to come. ... Phaostron "555" Multimeter incorporates more ranges, including AC current, greater visibility, simplified and rhaQstron GREATER RANGES ... 3 TO 1 STEPS functional controls and the greatest value offered to date. EASIER See the Phaostron "555", note its many outstanding rha©st ron FASTER & FUNCTIONALLY features, its beautiful satin chrome case, its compact- to use and read ness and light weight, and you will know why "YOU CANNOT BUY BETTER" PRICE $39.95 at your PARTS DISTRIBUTOR Manufactured by PHAOSTRON COMPANY 151 Pasadena Avenue South Pasadena, Calif., U.S.A. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 9 E r \ \\ / \ / \ "/ \ ,, \ / -'0"-THE ONE INSTRUMENT,/"OU, NEED MODEL 712 $39500 NET JACKSON COLOR BAR / DOT GENERATOR Signal Outputs 8. Black, relative luminance zero, chrom- Internal Adjustments 1. Composite video of either polarity, adjust- inance zero 1. Burst amplitude. able amplitude to 2 volts across 90 ohms. Luminance and chrominance held to 10 per- 2. 3.58 frequency vernier. 2. Modulated R.F., channels 3 through 5, 0.1 cent, phase angles to ±5 degrees 3. Sync. lock controls. volt across 300 ohms. Position 2 -Color Difference. 3. Horizontal sync., positive polarity, 1 volt 7 Bars of zero luminance in the following Tube Complement across 200 ohms. sequence: 12AT7 -8 616-10 4. Color subcarrier, 4 volts across 200 ohms 1. Black, relative chrominance zero. I2AX7 -4 5U4 -G 1 burst - at phase. 2. I, relative chrominance 0.25 6AL5 - 1 6817 - 1 Synchronizing Signals 3. Q. relative chrominance 0.25 1. Horizontal sync. and blanking (F.C.C. stand- 4. Black, relative chrominance zero Circuit Operation 5. R -Y, relative chrominance 0.25 ards). 1. Color sub -carrier and sound frequencies are 2. Vertical sync., serrated and locked to hori- 6. B -Y, relative chrominance 0.25 determined by crystal oscillators. 7. Black, relative chrominance zero zontal. 2. Color phase angles are determined by an 3. Vertical blanking. Phase angles held to ±2 degrees. accurate, low impedance delay line. 4. Color burst (N.T.S.C. standards). Positions 3, 4 and 5 -Single bars, luminance 3. Direct gating of proper chrominance phase 0.3, chrominance 0.5, occupying approxi- Video Signals is employed for each color bar to attain mately 60% of screen width. maximum stability and reliability 1. Dots (nominal 108 dots) rather 1. Red (position 3) than usual methods 2. Crosshatch (nominal 12 by 9) utilizing quadrature 2. Green (position 4) encoders. 3. Color bars (5 switch positions) 3. Blue (position 5) 4. Serrated vertical sync. is maintained an in- Position 1 -Multi. tegral divisor of horizontal rate. 8 Bars in the following sequence: Sound Carrier, approximately 25% of peak 5. Luminance and chrominance levels are re- 1. White, relative luminance 1.0, chrom- picture carrier, placed 4.5 megacycles from pic- liable and stable. No multivibrators inance zero ture carrier. are em- 2. Yellow, relative luminance 0.89, chrom- ployed in generating color bars. inance 0.44 Panel Controls 6. No internal or external adjustments are 3. Cyan, relative luminance 0.70, chrom- 1. R.F. carrier tuning, channels 3 through 5. necessary for proper bar widths, luminance inance 0.63 2. Video output amplitude. or chrominance levels, For use on 105-125 4. Green, relative luminance 0.59, chrom- 3. Horizontal lock. volts 60 cycle AC. inance 0.59 4. Standby switch (sound on, sound off). Physical Characteristics 5. Magenta, relative luminance 0.41, 5. Video output polarity switch. chrominance 0.59 6. Power switch. Dimensions -161/2" wide x 91/2" high x 101/4" 6. Red, relative luminance 0.30, chrom- 7. Function switch (crosshatch - dots - color deep. Designed to match other Jackson TV inance 0.63 bars) Equipment, both in styling and exterior di- 7. Blue, relative luminance 0.11, chrom- 8. Color bar switch (Multi, Color Diff., Red, mensions. inance 0.44 Green, Blue). Weights -27 net pounds. Shipping 32 pounds. II Service Engineered "Test Equipment JACKSON ELECTRICAL INSTRUMENT CO. 16.18 South Patterson Boulevard, Dayton 2, Ohio In Canada: The Canadian Marconi Company 10 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 111 MINIATURIZATION By their very nature, printed circuits are extremely does -it" step toward complete automation. compact. They open up virtually unlimited possibilities National Vulcanized Fibre Co. is a pace -setter in to alert designers concerned with the miniaturization the development of foil -clad laminates-the basic of electrical and electronic devices. From the simplest materials for most printed circuitry. Copper -Clad switches to the most complex computers, printed cir- Phenolite-by National-is recognized as the standard cuits are proving their versatility and great potential by fabricators everywhere. For Phenolite is a high- application. quality base laminate that can be engineered to fit your Complicated manual wiring is replaced by a pattern conditions. It has the high insulation resistance, low of conductors, coils, resistors, and other components electrical loss, and low moisture absorption required in "printed" on a sheet of laminated plastic. Low in cost, the right base material for printed circuits. It is light uniform in performance, and free of wiring "bugs," in weight, easily punched and worked, and withstands such assemblies are speedily mass-produced. Labor effects of the various circuit -printing processes. costs are drastically cut two ways-far fewer per- No matter which method you use to produce printed sonnel are needed, and lesser -skilled workers can easily circuits, Phenolite clad laminates are the ideal base assemble (and service) complex devices with less materials. Whether clad with metal foils, or non-me- chance of error. Since exact wiring duplication is tallic materials (such as rubber, vulcanized fibre, etc.) achieved, inspection is greatly simplified. Assemblies there is a Phenolite laminate for your particular job. grow small in size, overhead is reduced, less floor space Ask any of our district offices or Wilmington head- is needed ... the whole problem takes a big "easy- quarters for details. HENOLITE HERE'S HELP FOR YOU-our new, fact -filled, 12 -page' bulletin entitled "Mechanize Your Wiring With Copper -Clad Phenolite." Contains full Laminated PLASTIC information and application data on Copper -Clad Phenolite and other metal and non-metal clads. Write for it today! Address Dept. A12. Also manufacturers of Vulcanized Fibre, Vul-Cot Waste Baskets, Peerless Insulation, 1ST ATI0 1ST AL Materials Handling Equipment and Textile Bobbins VULCANIZED FIORE CO. WILMINGTON 99, DELAWARE TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 11 THIS IS IT! This is the actual size of the newest, small- est Blue Jacket - ready now to help solve your produc- tion problems! ??( NEW..a 3 -watt miniaturized axial -lead wire -w nd resistor This power -type wire wound axial -lead Blue Jacket is hardly larger than a match head hut it performs like a giant! It's a rugged vitreous -enamel coated job- SPRAGUEand WATTAGE DIMENSIONS MAXIMUM like the entire Blue Jacket family, TYPE NO. RATING L (inch.) D RESISTANCE it is built to withstand severest humid- ity performance requirements. 151E 3 "t, 6,000í1 Blue Jackets are ideal for dip -sol- 27E 5 1;, s,, 30,000 dered sub -assemblies ... for point -to - 28E 10 l', . 50,000 IT point wiring ... for terminal board mounting and processed wiring boards. They're low in cost, Standard Resistance Tolerance: ±57,, eliminate extra hardware, save time and labor in mounting! Axial -lead Blue Jackets in 3, 5 and 10 watt ratings are available without delay in any quantity you require. * * 4131111 WRITE FOR ENGINEERING BULLETIN NO. 111B SPRAGUE SPRAGUE ELECTRIC COMPANY 233 MARSHALL ST. NORTH ADAMS, MASS. 12 for product InformatIon, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 r- ) As We Go To Press... New Component Placing System Manpower Conference with The Fourth Conference on Scien- An automatic system to place com- types and sizes of components by the leads tific Manpower, sponsored ponents in varied types of electronic up to eight each. National Scientific' Foundation, the equipment sub -assemblies was de- The system has an electronic the En- reader, up production National Research Council, scribed recently by George W. Gam- which sets gineering Manpower Commission, from punch cards. When a dif- ble, of the G -E Advanced Electron- steps the Scientific Manpower Commission ferent job is to be done, the reader ics Center, Ithaca, N.Y., as a further and Section M -Engineering of the is for the step toward the automatic factory. fed the punch card job. It American Association for the Ad- up to prepare The system, with flexibility to switch then sets the system of will be convey them to vancement Science, held and test components, in Berkeley, California, December rapidly from one type of assembly the assembly unit, assemble them. to another, is being built by GE for and test the completed sub -assem- 28-29, 1954. the Army Signal Corps as an indus- bly. trial preparedness measure. Unlike The system can be programmed to Minimum Gov't. Control automatic assembly systems for place any number of components, long -run, standardized operations, limited only by the size of the cir- of Broadcasting Expected the GE system can adapt itself im- cuit boards and the size of compon- From the new FCC Chairman mediately to work on varied sizes ents to be placed. The G -E system George C. McConnaughey comes the of circuit boards, using different can place 1,600 components per hour. statement, "I believe in having as few government controls as possible. . . . The public interest is on the Magnetic Recording Group standards and cooperation with al- one lied hand served by the full force To Study Standardization organizations; a preliminary of private initiative and private in- of playback for all survey standards vestment, and on the other protected Four subcommittees to study tape speeds; review of the status of by alert government regulation dimensional specifications, tapes and standardization problems and rec- which prevents of reels; and investigating the prepa- abuse private ommend procedures to be adopted freedom." At about the same time, have been set up by the Standards ration of standards on heads and NARTB track placements. President Harold E. Fel- and Engineering Committee of the lows noted that "the has come Association members who time Magnetic Recording Industries As- have when the vast resources and strength been assigned chairmanship of these sociation, which recently held its of American business must be uti- subcommittees are C. J. LeBel of lized in of second annual meeting at the Hotel Devices Inc., the defense broadcasting Audio Russell Tinkham as a free institution." New Yorker, N.Y. of Ampex Electric Corp., Arnold Specific standardization problems Hultgren of American Molded Plas- to be studied are the general order tics Corp. and Clarence Sprosty of MORE NEWS of procedure to be adopted in setting Brush Development. on page 14 SYLVANIA EXPANDS SENECA FALLS PRODUCTION Completion of automatic aluminized TV picture tube facilities enables additional output of 25,000 more units per month. Photo at left shows new settling room under one man centralized control. At right new equipment for automatic in -line aluminizers are seen. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 13 about a half pound per square inch, As We Go To Press . . . (continued) and can withstand winds up to 125 New Radar for Arctic Defense Net miles per hour. The radome protects the radar antenna from Arctic gales, snow and ice. Inside radome building, radar height -finder has own room above control center. Air pressure supports rubberized grass fabric "balloon." Radome entrance is through air lock chamber Three versions of new radar height finder made for U.S. Air Force are (I) mobile unit, (c) radome for radar in Arctic climates, and (r) unit for fixed installations in temperate regions Engineers of the G.E. Heavy Mili- A powerful new radar height - search radar to detect high -flying tary Electronic Equipment Dept. at finder being made by the General aircraft and to provide information Syracuse, and the Griffiss AFB at Electric Co. for the U.S. Air Force on distance, altitude and flight di- Rome, N.Y., collaborated in devel- is helping to strengthen defense net- rection. oping the radar. works of the United States and its In Arctic climates the radar is allies. It is reported that the device housed in a dome -shaped circular can detect planes three times as far structure with a balloon -like radome AF Aids RR as previous units of this type. Exact made of woven glass fabric impreg- spirit of Casey Jones flew into is classified. The radar height - nated with a rubber compound. The The range on an Air Force Mitchell finder is being used together with radome is supported by air pressure, Virginia B-25 and helped to unsnarl a rail- road disrupted by the recent Hurri- FCC Reports Mobilization Group Formed cane Hazel. For the first time in history, two Air Force TV Broadcast Figures A panel of leading engineers and railroading scientists from industry, government officers and a Navy captain played and universities has been formed to aerial dispatcher. Initial investment in tangible TV Frank B. Evans study methods of mobilizing scien- The officers, Maj. broadcast property, as of the end of M. Dunn, USAF, tific resources in case of emergency. and Capt. James 1953, has been reported by the FCC USN, on a The group, headed by Dr. James R. and Capt. C. W. Rooney, to total $233,100,000. This includes routine cross-country flight between equipment and property owned by Killian, Jr., President of MIT, will Naval air have their findings reviewed by the Andrews AFB and the 325 TV stations and four networks. station at Key West, Fla., received The total investment accounts for Office of Defense Mobilization, and recommendations a distress call from the Atlantic $71,600,000 by networks and their 16 will be submitted Richmond Radio to the President. Coast Line R.R. via owned and operated stations; $87,- in Va. Hurricane Hazel had broken 400,000 by 91 pre -freeze stations; New Calif. Hq for Sprague railroad communications, fouled $40,900,000 by 109 post -freeze VHF railroad signals and disrupted stations; and $33,000,000 by 109 post - The Sprague Electric Company schedules. The Atlantic Coast Line freeze UHF stations. has started construction of a 13,000 had lost contact with its trains. Uti- Time sales during 1953 by the net- square foot, one story building in lizing the B-25 as a relay point and works and 260 stations were $384,- the Venice section of Los Angeles, the officers as stop -gap dispatchers, 000,000, or 36% above 1952. Of this Calif., to house all its Southern Cali- the railroad transmitted schedules amount, network time sales ac- fornia operations. The building, in from Richmond Radio to Rocky - counted for $171,900,000, or 25% contemporary modern California ar- mount, Va. Later, as the airplane above 1952; national spot sales $124,- chitectural style of stone, glass, and continued south, Radio Danville 318,000, or 55% over 1952; and local cinder block, is expected to be com- added its voice to the impromptu sales $88,474,000, or 36% above 1952. pleted in the spring of 1955. The communication system. Stations with less than $25,000 an- Sprague company will then move nual sales are not required to report from its present rented quarters in MORE NEWS their revenues or investment. Culver City. on page 1 8 14 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Your FILMS and COSTS BOTH LOOK BETTER with the new GPLVIDICON FILM CHAIN Low first cost; low operating cost Operates unattended; frees studio manpower Photo -conductive tube Stable black level No shading correction required No back or edge lighting required Lowest "noise" level in television Easy to multiplex W TWO MAJOR ADVANTAGES for station owners sum up the features of this new Vidicon Film Chain produced by GPL. First, it sets a new high for quality. STATION OWNERS & OPERATORS Second, it saves dollars. And more dollars. It's built around a photo -conductive tube, with long -proven GPL Test this GPL chain in your station, circuits and construction techniques. It is compact, simple and rugged ... easy to maintain, flexible for 4 or more multiplex com- with your projectors and monitors . . . binations. All your existing projectors, monitors, master monitor and standard racks can be used. A stable black level, and almost your operating conditions. See for your- complete absence of spurious signals, eliminates the need of con- self its almost automatic operation, its stant attention. You save man-hours that previously went into monotonous monitoring. quality with all types of film. No charge, This GPL chain has the lowest noise level in television. The grey scale reproduction is true. In all, with this GPL combination no obligation. Just write, wire or phone. of both quality and economy, you can afford to retire your icono- scopes to slides. And, in equipping a new station, the GPL Vidicon is unmatched for value. General Precision Laboratory INCORPOR ATED PLEASANTVILLE NEW YORK 'PII, Write, wire or phone for information A SUBSIDIARY OF GENERAL PRECISION EQUIPMENT CORPORATION Regional Offices: Chicago Atlanta Dallas Glendale, California TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. Is HOW CAN AUTOMATIC CONTROL strengthen our defenses i MISSILE GUIDANCE . . . GUN STABILIZATION AIRCRAFT NAVIGATION . .. WEAPONS SYSTEMS The staff of engineers at Ford Instrument Company are experts in the field of automatic control. Every week, in the laboratories and shops of this large company thousands of men are working on electronic, hydraulic, mechanical and electrical servo -mechanisms, computers, controls and drives to solve problems for the Army, Navy and Air Force. Ever since Hannibal C. Ford started, in 1915, to develop and build the first gunfire computer for the U.S. Navy, Ford Instrument has been leading the 's' . in applying the science of automatic control to America's defensi\ strength ... and to American industry. 34 Each year the Ford Instrument Company is adding to its staff of several hundred engineers. If you are an engineer FORD INSTRUMENT COMPANY and can qualify, there may be a position for you. DIVISION OF THE SPERRY CORPORATION 31.10 Thomson Avenue, Long Island City 1, N. Y. 16 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Development Production AN INTEGRATED ELECTRONICS OPERATION Hoffman's reputation for getting things done is due, in part, to the unification of Research -Development - Design -Production into one closely integrated electronics operation. At Hoffman - instead of the usual four Navigational Gear completely separate operations - one technical director Guided Missiles is assigned to co-ordinate each new project from Radar start to finish. Every new project is developed in close Noise Rejection Counter Measures cooperation with the divisions ahead, including Computers the practical problems of quantity production. This Communications Terminal Equipment integration practically eliminates the all -too -common Transistors duplications and overlapping of functions, the errors and re -work caused by poor liaison, and materially cuts down the usual time lag between the testing of the prototype and actual production. Hoffman has become a leader in electronics by doing progressively complex jobs - to specifications - to cost estimates - and on schedule. tolima n Write for your copy of a LABORATORIES, INC. REPORT FROM HOFFMAN LABORATORIES A SUBSIDIARY OF HOFFMAN RAHION CORP. HOFFMAN LABORATORIES, INC. A Subsidiary of Hoffman Radio Corp. 3761 South Hill Street, Los Angeles 7, California Challenging opportunities for outstanding electronics and mechanical engineers. Write Director of Engineering. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 17 As We Go to Press ... . COMING EVENTS Largest Delay Lines Nov. 29 -Dec. 4-First International Au- AES, Alexandria Hotel, Los Angeles, The successful manufacture of the tomation Exposition, 242nd Coast Calif. largest solid ultrasonic delay lines Artillery Armory, New York, N. Y. Feb. 17-18-Conference on Transistor ever built is reported by Corning Dec. 7 -9 -3rd Annual Wire and Cable Circuits, sponsored by IRE, profes- Glass Works, Corning, Symposium, sponsored by Army Sig- sional Group on Circuit Theory, Sci- N. Y. Made Mon- of fused silica, the folded nal Corps Engineering Labs, Ft. ence and Electronics Div. of AIEE, -path lines mouth, and Wire and Cable Industry, and Univ. of Pa., University of Pa., have a delay of 3,333 microseconds. Berkeley -Carteret Hotel, Asbury Philadelphia, Pa. Two of these 20 -in. diameter delay Park, N.J. Mar. 14-18-ASTE Western Industrial lines were built for the Lincoln Lab- Dec. 8 -10 -4th Annual Eastern Joint Exposition and Annual Meeting, oratories at the M.I.T. They will be Computer Conference and Exhibi- Shrine Auditorium and Exposition used in the development of proto- tion, jointly sponsored by the AIEE, Hall, Los Angeles, Calif. type radar equipment. IRE, and ACM. Bellevue -Stratford March 21-24-1955 IRE National Con- Disk -like in appearance, each line Hotel, Phila. Pa. vention, Kingsbridge Armory, New consists of a thin polygon York, N.Y. sheet of Apr. 18-22-National fused silica. The 1955 Convention of sheets were cut and Dept. of Audio -Visual Instruction ground by precision methods similar Jan. 17-19-Conference on High Fre- of Nat'l. Education Assn., Hotel Bilt- to those used in the preparation of quency Measurements, sponsored by more, Los Angeles, Calif. optical glass to meet tolerances up IRE, AIES, URSI and Nat'l Bur. of May 16-20-National Materials Han- to ±0.0003 -in. After testing, the Standards, Hotel Stoller and Dept. of dling Exposition, International Am- glass was mounted and cushioned Interior auditorium, Washington, D.C. phitheatre, Chicago, Ill. inside an aluminum casing. Jan. 20-21-Symposium on Printed Cir- June 20 -23 -2nd International Powder cuits, sponsored by RETMA, Univ. of Metallurgy Congress, Reutte, Tyrol, Pa., auditorium, Philadelphia, Pa. Austria. Jan. 24-26-Plant Maintenance & En- Aug. 24-26-Western Electronic Show First Transistor Radios gineering Conference, International & Convention, San Francisco Civic Amphitheatre, Chicago, Ill. Auditorium, San Francisco, Calif. in Mass Production Jan. 26 -28-10th Symposium on Instru- Nov. 2-5-World Symposium on Ap- The first commercial transistorized mentation for the Process Industries, plied Solar Energy, conducted under portable radio receiver to be mass sponsored by School of Engineering, leadership of Stanford Research In- produced for the general public has Chemical Engineering Dept., Agri- stitute, Phoenix, Arizona. cultural & Mechanical College of ACM: Assoc. for Computing Machines. been announced by the Regency Texas, College Station, Texas. AES: Audio Engineering Society. Div. of I.D.E.A. AIEE: American Institute of Electrical Engineers. The unit features Feb. 10 -12-7th Annual Southwestern IRE: Institute of Radio Engineers. long battery life, measures 3 x 5 x and Electronics ISA: Instrument Society of America. IRE Conference NACE: National Assoc. Corrosion Engineers. 11/4 in., and retails for $49.95. The Show, sponsored by Dallas -Fort NARTB: National Assoc. of Radio and TV Broad- radio uses only four Worth section of IRE, Baker Hotel, casters. transistors of RETMA: Radio-Electronics -TV Manufacturers the grown -junction n -p -n germa- Dallas, Tex. Assoc. Feb. Fair-Los Angeles, RTCM: Radio Technical Commission for Marine nium type, made by Texas Instru- 11-13-Audio Services. ments. One of the low-cost transis- sponsored by Los Angeles Section of URSI: International Scientific Radio Union. tors is used as a combination mixer - oscillator, two as i -f amplifiers with power gain of 34 db, and one as an Co.; a tiny tuning capacitor pro- former made by Texas Instruments. audio amplifier with 40 db gain. One duced by Radio Condenser Co.; a These and other tiny components are germanium diode detector is em- diminutive i -f transformer designed assembled into the completed radio ployed. by Vokar Corp.; a miniature low- in a semi -automatic process using The radio, designated the TR -1, is cost volume control created by Chi- printed wiring and dip soldering a notable example of cooperation cago Telephone Supply Corp.; a very techniques. between several component manu- small ceramic capacitor engineered MORE NEWS facturers. Included are a small, effi- by Centralab Div. of Globe Union; on page 21 cient speaker made by Jensen Mfg. and a subminiature output trans- (I) New Regency portable radio employing four Texas Instruments grown ¡unction germanium transistors. Unit measures 3x5x1I/4. (r) Receiver circuit shows one transistor used as mixer -oscillator, two as i -f amplifiers and one as audio amplifier. Detector is germanium diode 18 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 An An nouncement tv of the Utmost Importance to Engineers Doing Research and Design Work in the Entire Audio Frequency Range. Á ,Y.J. w 3«zimadMt Burnell and Co., Inc. is proud to announce the development of an entirely new product- RoToRoi a Variable Toroidal Inductor (patent applied for) ROTOROID will prove to be a valuable aid in the solution of many engineering problems - in research and design - and opens new possi- bilities for production which were previously impractical or impossible. RTRoiD An outstanding feature of ROTOROID is that, at maximum inductance, it provides the full Q is a .usly variable, stepless toroidal inductor which can ... of the toroid it contains. Thus, the user is at provide ge of maximum to minimum inductance in 180° once able to take advantage of the high Q char- rotation of a s aft. acteristics of toroids while at the same time having available a variable inductor not previ. contacts and is therefore ... employs no mechanical resistance ously available in a toroid. free of noise and wear. Virtually unlimited. Just a few of the requires no DC saturating currents and thereby eliminates the Applications: ... many possible uses of ROTOROID are: need for circuitry. Tunable Audio Oscillators is applicable over the entire audio range (from approximately ... Variable Z Devices is not limited to any stock value of nominal 300 cps). ROTOROID Servo Systems inductance. It is available in any value of inductance now available Telemetering in regular toroids. Adjustable Selective Networks ... is hermetically sealed and is virtually vibration and shock- Variable Phase Shift Networks proof, can be chassis or panel mounted. Variable Filters Electra -Mechanical Control Systems Write Department for further ill rmation. Availability: Immediately available: ROTOROIDS VTI-A and VTI-B which are equivalent in electrical characteristics to Burnell Burne) & Co., Inc. toroids TC -16 a in cases 21/4' in Soon to be available: two Yonkers 2, New York iniature types, VTI-C and VTI-D, equivalent to urnell toroids TCO and TC -6, PACIFIC DIVISIONI 720 Mission Street, South Pasadena, California FIRST IN TOROIDS AND RELATED NETWORKS R O T O R O I D S®A continu. ariable, stepless toroidal i for wh .c n prou'. nge of maximum to minuc n of a shaft. 3 Write for new brochure which gives complete technical data. REASNS to check TOROIDS Combining the advantages of toroidal type winding with the molybdenum permalloy dust core and other specially selected materials, these toroids provide higher Q than any other structure. They also provide greater stability of inductance vs. temperature and level in a smaller space. Their self -shielding properties permit compact BURNELL assemblies of coils with a minimum of deleterious effects. Supplied to an inductance accuracy of 1%. Available in standard, miniature and sub -miniature sizes. Also in a wide variety of finishes, including for the first time toroids molded first! in a new special material. 3 EXTRA REASONS TO CHECK BURNELL FIRST! TELEMETERING FILTERS * Proven Top Quality Band pass filters available for every channel ranging from 400 to 70,000 cycles for band width between 15 - 40%. Low pass Competitive Prices filters available for operation in either unbalanced or balanced * line, and range in cut off frequency from 6 up to 10,500 cycles. - Prompt Deliveries Also, miniaturized filters that do not sacrifice attenuation characteristics, save up to 80% space. I FIRST IN TOROIDS Write Department G u.u.het BURNELL & CO., INC. for Catalog 102A legier AND Yonkers 2, New York 1 RELATED NETWORKS PACIFIC DIVISION: 720 Mission Street, South Pasadena, California As We Go to Press ... . SATELLITE TV View at Emporium, Pa. shows Sylvania's satellite TV transmitting sites. Program on VHF channel 6, WJAC-TV, Johnstown, Pa., is microwaved to UHF station KG2XEL where it is retransmitted on Channel 82. Sylvania also operates KG2XDU, Channel 22, located at VHF receiving site. Both stations have output power of 10 watts (175 watts ERP) and are used in conducting research and development work designed to provide vide) reception in areas where good signals are blocked by mountains, hills or other natural obstacles. Ampex Celebrates Tenth Anniversary Typical Installation of B & M Spotlights in "I Love Lucy" TV Show To commemorate the firm's 10th anniversary, executives of the Am- pex Corp. presented a 10 -year serv- ice pin to its founder and president, Alexander M. Poniatoff. with Ampex was founded November 1, fl4t4'4&4t 1944, by Mr. Poniatoff, as a manu- facturer of precision, permanent - BARDWELL & MCA ISTER'S magnet motors and generators used Engineered Television Lights in airborne radar scanning devices. g g TV With the end of World War II de- This complete line of television spot- fense contracts were suddenly can- lights was especially designed and celled and the company found itself engineered for television stage light- without a market for its products. A ing. The many years of experience in search for a suitable postwar prod- TV SPOT the production of studio lights for uct of commercial value ended when Model 5000 stage and motion pictures was drawn upon to produce the B & M TV Spots Poniatoff witnessed a demonstration which make possible painting with of the Magnetophon, a German tape light. Painting with light is the abil- recorder. Poniatoff and his two lead- ity to control the light source in order ing engineers, Harold Lindsay and to emphasize the necessary high- Myron J. Stolaroff, began develop- lights and all the important shadows. ment of the first Ampex recorder in Only through controlled Iight can the April, 1947 and built the first ma- scene and subject be given the desired chine by February, 1948. brilliance, beauty, and third dimen- Fate catapulted Ampex to the sional effects to produce ideal screen forefront of the magnetic recording pictures. industry in the form of Bing Crosby who was faced with the prospect of `-`TV SPOT having to go to "live" broadcasting, Model 500/750 because of a low Hooper rating at- to "canned" characteristics TV SPOT tributed Model 1000/2000 of recording methods used in 1948. In his search for a recording medium that could not be distinguished from direct broadcasting, he arranged a series of demonstrations by manu- facturers of the then "new" mag- netic recording machines including Ampex. On hearing the Ampex, Crosby placed an order for the first Our specialists ore always ready to assist and advise your engineering staff so that your 20 Ampexes at $4,000 each. These studios and stages will be fully equipped to later sold to ABC, properly point with light. Write for complete machines were and prices of these 88 M TV Spots. and Bing Crosby Enterprises has specifications been an important Ampex distribu- tor ever since. BARDWELL & McALISTER, Inc. BURB0 ANKTACALLIIFO NA page. TELE -TECH A ELECTRONIC INDUSTRIES December 1954 For product information, use Inquiry card on last Years of experience groves to users .. . 18 YEARS Li_ 18 YEARS the dependability of Westrtx ¡ElectrIc KOVAR 16 YEARS Glass -sealing Alloy AMPEREX 18 YEARS 12 YEARS ?L'RES c 13 YEARS 11 YEARS ACHLEr* 15 YEARS DtaC 6 YEARS VARIAN Westinphovse Trade Mark No. 33' associates 18 YEARS The ideal alloy for glass sealing, Kovar matches the expansivity 5 YEARS of certain hard glasses over the entire working temperature range. It resists mercury attack, has ample mechanical strength and seals readily. A permanent and impervious bond is obtained by a closely controlled thickness of oxide on Kovar alloy interfused with hard glass. Kovar is a cobalt, nickel, iron alloy, manufactured under YEARS very carefully controlled conditions, and supplied by Stupakoff ¡... 18 in the form of: SHEET, ROD, WIRE, FOIL, TUBING, EYE- LETS, LEADS and FABRICATED SHAPES. The prominent users of KOVAR and the length of time they have employed 7 YEARS this metal are convincing proof of satisfaction. Full information on the use of Kovar is given in Stupakoff Bulletin 145, which we will send upon request. Stupakoff CERAMIC & MFG. CO. Sigh Latrobe, Pennsylvania 13 YEARS 24 For product information, use Inquiry card on last page. TELS -TECH & ELECTRONIC INDUSTRIES Decerrber 1954 U.S. C. PRINTED CARD RECEPTACL E S ARE SPECIFIED FOR MODERN DESIGN U. S. C. offers a Complete CHANNEL STRENGTH Repertory of Printed Card CONTACTS Receptacles to meet the ever increasing requirements of Modern Applications. SNAP- IN CONTACT Illustrated on this page CONSTRUCTION are a few of the U. S. C. Receptacle versions that FATIGUE PROOF have found wide acceptance by leading engineers. Contact U. S. C. is constantly co- EASY CARD INSERTION operating with Industry in Polarizing designing and developing Insert ` PROPER CONTACT new types in various RETENTION FORCES configurations. You will find the solution to your connector problems at U. S. C. WIDE TOLERANCE Over a thousand different RANGE CARD types of connectors are now OPERATION manufactured by U. S. C. RUGGED -COMPACT - LIGHTWEIGHT Solder Contact Typical Custom Construction Wire Wrap Contact .t Patents Pending For I /16" boards (range .052 - .072) UPCR-6, 10, 15, 18, and 22 For 1/16" boards - Double Row Wire Solder - AVAILABILITY UPCR-DW6, 10, 15, 18, and 22 Polarizing Insert For 1/16" boards - Double Row Wire Wrap - DW UPCR-D and 22 Series Insulating body available in Mineral UPCR-DW6, 10, 15, 18, and Filled Melamine, Alkyd 440 A and For 3/32" boards - Double Row Wire Solder - Diallyl Phthalate UPCR-93b6, 10, 15, 18, and 22 Contacts - Phosphor Bronze and For 3/32" boards - Double Row Wire Wrap - Beryllium Copper - Silver plated UPCR-93DW6, 10, 15, 18, and 22 with Gold Flash other designs to specifications U. S. CO1'lPONENTS, Inc. f Associated with U. S. Tool and Mfg. Co., Inc. 454-462 East 148th Street, New York 55, N. Y. CYpress 2-6525-6 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 23 SIMPLIFY CIRCUIT TRIMMING with 73duRNs sub -miniature PRINTED CIRCUITS - 1904 STYLE: The letter reproduced below, written by Frank J. Sprague TS to Thomas A. Edison, is dated Jan. 3 TIMES ThThiPO 4, 1904. It provides some interesting ACTUAL historical insight into the thinking SIZE of leading scientists more than 50 years ago. One of many applications when space is at a premium - - v.' 4-- _ - / i ) . _ // f ,-.ry j' i ,.,...u., J -....t c..., i.G- .I.,..k o... .., .tG 7^. d - The text reads: Dear Edison: As the boss chemist-tell me something. I want to draw a line on RESOLUTION: AS LOW AS 0.25% a piece of brown paper which will be a fairly good conductor. There POWER RATING: 0.25 WATT AT 100° F. are several preparations-of course -but I have an idea you can tell WEIGHT: ONLY 0.1 OZ. me the best. Sincerely, BOURNS RIMPOT is a 25 turn, fully adjustable wire -wound Sprague potentiometer, designed and manufactured exclusively by BOURNS Sprague- LABORATORIES. This rugged, precision instrument, developed expressly I really don't know the best thing. for trimming or balancing electrical circuits in miniaturized equipment, & is accepted as a standard component by aircraft and missile manufac- Ink thickened with gum dust over turers and major industrial organizations. with electrotyp.ers grafite is one Accurate electrical adjustments are easily made by turning the way-ditto gold leaf-strong solu- exposed slotted shaft with a screw driver. Self-locking feature of the tion nitrate silver & reduce to silver shaft eliminates awkward lock -nuts. Electrical settings are securely by fumes of phosphorus. Also bronze maintained during vibration of 20 G's up to 2,000 cps or sustained powder made from copper. acceleration of 100 G's. BOURNS TTPOrS may be mounted indivi- dually or in stacked assemblies with two standard screws through the "TOM THUMB" rocket fuze de- body eyelets. Immediate delivery is available in standard resistance veloped by Elgin National Watch Co. values from 10 ohms to 20,000 ohms. BOURNS TR ToPOrS can also be is about 1/10 the size of the me- furnished with various modifications including dual outputs, special chanical time fuze which was con- resistances and extended shafts. sidered a miracle of miniaturization BOURNS also manufactures precision potentiometers a decade ago. According to the firm's to measure Linear Motion; Gage, Absolute, and president, J. G. Shennan, the World Differential Pressure and Acceleration War II variety are fast becoming museum pieces. SAFETY GLASS in TV receivers J3ÛURNS LABORATORIES is no better than the mountings that hold it. In a recent case, the picture 6135 MAGNOLIA AVENUE, RIVERSIDE, CALIFORNIA tube imploded, blowing the still -in- Technical Bulletin On Request, Dept. 172 tact protective window right out of (Continued on page 28) 24 For product information, use inquiry card on last peg,. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 TV camera action ever known with CAMERA EQUIPMENT GRAVITY BALANCED ROCKER TYPE PAN AND TILT HEAD You'll know what we're talking about the instant you try it! Cur new ROCKER Head has almost gyroscopic action, smooth, effortless. s' No longer do you have to fight spring balance to make your ti ts. You establish absolute balance by positioning camera on ROCKER head platform and adjusting center of gravity with vernier control. Long and short lenses are compensated for with vernier adjustment. Prompting device may be added and balanced easily. Convenient brake handles and locking device for pan and tilt tension. Fits standard tripod and dollies. Lighter in weight-and more economical in price. See it-test it-it's a "musr"! Accessories that SURPASS accepted standards- for Studio, Mobile and Micro -Relay Equipment NEW PORTABLE 3 -WHEEL DOLLY Model C BALANCED TV Head provides correct COLLAPSIBLE New Dolly folds to fit center of gravity in a FLASH- without groping. into carrying case -18"x12" No matter what focal x36': Weighs only 60 lbs. Has length lens is used on for steering, the turret, the camera wheel in rear may be locked for may be balanced by which the positioning handle straight dollying. without loosening the camera tie -down screw. Something every camera- DOLLY I man has always desired. COLLAPSED Famous BALANCED TV Head MICRO RELAY supporting a TV camera. Both are mounted on one of Micro wave relay beam our all -metal tripods, metal reflector head, also which in turn is mounted Head is tripod. perfect for on a Ceco Spider Dolly. parabolas up to 6 ft. Here is a "team" outstand- diameter, withstands torque ing for versatility and spec's environmental treaded. maneuverability in studio in Tripod legs work unison or on location. one lock knob, spurs and rubber foot pads included. FRANK C. ZUCKER GHI11ERfl ESUIPf11Ef1T C., inc. York City WRITE FOR COMPLETE ILLUSTRATED BROCHURE Dept. T-1215 1600 Broadway New PANORAM DOLLY gives camera complete mobility; smooth panning, dolly shots, run- ning shots, special effects. Two man crew. CAMERA is counterbalanced in Model PD -3 TV Pedes- tal by Houston -Fearless, enabling cameraman to raise or lower with ease. WHICH TYPE OF CAMERA CINEMOBILE offers extreme maneuverability. Camera boom raises hydraulically. Ideal for MOUNT SHOULD YOU BUY? smooth dollying, panning, etc. Two man crew. Proper mounting of television and for a specific purpose. Each is the finest motion picture cameras is essential for of its type, the standard of the industry. efficient operation, smooth production A Houston -Fearless representative and good showmanship. Choice of will be happy to analyze your require- mobile equipment should be determined ments and recommend the equipment by the size of your studio, types of that will serve you best. Write or phone: shows, size of camera crew, camera The Houston -Fearless Corp., 11801 equipment used, budget and many West Olympic Boulevard, Los Angeles other factors. 64, California. BRadshaw 2-4331. 620 Each piece of Houston -Fearless Fifth Avenue, New York 20, N. Y. equipment shown here has been designed Clrcle 7-2976. HOUSTON -FEARLESS TC -1 CRANE raises camera to extremely high and low positions. Permits "fluid motion" shots. Foot -operated panning. .z >e'+ HOUSTON -FEARLESS All -Metal Tripod on MODEL BT -1 CRANE has power drive, hyorau- TV PEDESTAL MODEL PD -1 by Houston - Tripod Dolly gives mobility to cameras at lic lift. Provides lens height from 2' to 10'. Fearless is operated by cameraman. Rolls low cost. Completely portable. Ideal for Developed for Motion Picture Research smoothly, raises, lowers, turns on own radius. remotes. Council. 26 For product information, use inquiry card on lost page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 "PATENT PENDING ALI RIGHTS ZESRVED .ayyïiiìi {íiiirìiï iN E-1 Standard Types - TWO ELECTRODE TERMINAL MINIATURE THREE SINGLE WIRE COMPRESSION FOR MINATURE ASSEMBLIES ELECTRODE COMPONENTS TYPE MINIATURE SEALED amples and quota- (SUPP_IED WITH CASE) 'AVAILABLE WITH CASE) TERMINALS tions on standard ter- minals and c:osures will be supplied promptly on request. Require Custom Types? Special components for unusual require- ments can be sup- COMPLETELY STRAIN -FREE OCTAL HEADERS WITH plied quickly and HERMETICALLY SEALED END SEALS FOR SOLID METAL BLANKS TERMINAL WITH CUSHIONED CONDENSERS RESISTORS, FOR MAXIMUM RIGIDITY economically in rea- GLASS CONSTRUCTION TUBULAR ASSEMBLIES AND MECHANICAL STRENGTH sonable quantities. atalogs Available - ncluding specifica- tions, diagrams and ptional features. all or write :or opies, today! SUPER DURABLE COMPRESSION -YPE LUG TYPE, LEAD THRU HEADERS OFFER MAXIMUM SILICONE TREATED, INSULATORS FOR VOLTAGE RESISTANCE TO SHOCK STRAIN -FREE, VACUUM RATINGS FROM 2,000 AND VIBRATION TIGHT MULTIPLE HEADER TO 4,000 (rms.) for MultipleöaP' KEMOeadqu°mers Octal Sealed Compression Headers, Seals, Lead- {eoders. End lug-Type . DIVISION OF AMPEREX H eaders, Type ators, MiniatureCla ELECTRONIC CORP. n ELECTRICAL thru INDUSTRIES sures, etc. 44 SUMMER AVENUE, NEWARK 4, NEW JERSEY TEL h IBA (Continued from page 24) the cabinet. Luckily, no one was within range of the glass shrapnel. C0mplete Obvious moral: make stronger mountings. AUTOMATIC TOLL COLLEC- TORS are being installed on New Jersey's Garden State Parkway. Coin transactions made by the high- way robots are recorded on a tape recorder located in the administra- tion building. Any attempts to beat the toll collector by not paying or short changing sets off an alarm, and other toll collectors (humans, that is) can radio police patrol cars to pick up the deadbeat. RUSSIAN TV, according to some optimistic reports out of that country, includes nine stations and 700,000 receivers in use. The official newspaper, Izvestia, is complaining that a shortage of coax has pre- vented inter -city network connec- tion, and an irresponsible approach The BRADLEY METALLIC to receiver design has seriously de- layed large screen TV sets. SELENIUM RECTIFIERS which RECTIFIER MANUAL show no indication of failure or de- crease in output after more than An Invaluable Tool for the Engineer ... 1000 hours at 150° C are being built Bradley Labs., A Workable Guide for the Purchasing Agent experimentally by ... New Haven, Conn. The Bradley METALLIC RECTIFIER MANUAL is the PSYCHIATRIST friend of ours most comprehensive and up-to-date handbook on Selenium claims that President Eisenhower's and Copper -Oxide Rectifiers. It's a real "must" for every public slip -of -the -lip in calling RCA design and development engineer using rectifiers. president Frank Folsom, "Mr. Stan- Into its 144 pages are packed the facts and figures you ton" (CBS president), was a "Freu- need on - types, designs, circuitry, applications, characteris- dian slip with deeper significance." tics. Here, in clear, concise form, is all the usual information What significance? Impossible to tell and a great deal of the unusual. unless Ike becomes a patient. Included in the initial low price of $2.00 a copy is the ELECTROSTATIC SPEAKERS, revision service that will keep your manual always in step with which are becoming increasingly progress. As changes and developments occur, additions and popular because of their ability to revisions will be mailed automatically to all manual owners. reproduce high frequencies, were in- Fill out the coupon and mail it today. Your copy of the troduced many years ago, but were Bradley METALLIC RECTIFIER MANUAL will be de- driven off the market by the electro- livered promptly. dynamic type. Reasons for early failure, reports A. A. Janszen, in- to electrical 1 clude susceptibility Please send me copies of the Bradley breakdown, low efficiency, oxidation METALLIC RECTIFIER MANUAL at $2.00 each. of structural materials, and lack of Check for $ is enclosed. manageable thin membrane materi- als. NAME MORE SHAKESPEARE, and for B the benefit of the literati, the quota- FIRM LABORATORIES, INC. tion's source. ADDRESS HIGH ANTENNAS: Those that CITY ZONE stand high have many blasts to STATE BRADLEY LABORATORIES, INC. shake them. (King Richard III) 170A Columbus Ave., New Haven 11, Conn. (Continued on page 36) 28 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 C L CHICAGO TELEPHONE SUPPLY ELKHART INDIANA .'iecitcltólß Aecivrcn ,/17a44 Aadaee/ion eJ' %ce're'alrle e:97i),e4e:54t.5 . ounded /896 1 CL J11 r THE ONLY COMPLETE LINE FOR ALL COLOR TV APPLICATIONS 1. SIZES-"dime size" to 2 1/2 " diameter. 5. TERMINAL STYLES-for conventional soldering, printed circuits and wire wrap. 2. WATTAGES -2/10 watt to 4 watt. 6. COMBINATIONS-an endless variety of tandems, both 3. TYPES-carbon and wirewound with and without attached single and dual shaft. switch. 4. MOUNTINGS-conventional bushing, twist ear and snap - A CTS control can be tailored to your specific require- in bracket for printed circuits. ment. Miniature 3/4" "dime size" High voltage control for focus composition control. Con- applications. Rated up to serves panel space at price 5,000 volts DC across end ter- comparable to larger size bushing mounted controls. minals and 2 1 2 watts de- pending on total resistance. CTS type 70. Will operate up to 15,000 vo4ts DC above ground when mounted on insulated panel. CTS type 85. 1 1 8" diameter composition control for applications where ratings up to3; 4 watt required. CTS type 35. Concentric shaft tandem con- trol with conventional bush- ing mounting. Designed for front panel dual knob applica- tions, such as contrast and volume. Available in various combinations of composition or wirewound front and rear Ear mounted composition sections with or without on - îontrol. Simply twist two off switch attached to rear ?ars for rigid mounting. section. CTS type GC -C252- Eliminates bushing and 45 with wirewound front mounting hardware. section, corn position rear Available with shafts for section and on -off switch il- Higher Wattage Carbon Controls With Exceptional Four watt wirewound control Stability Available available with or without cen- ONE WATT: Entire 45 ter tap. CTS type 27 with tap series 15/16- diameter line illustrated. available with 90 series spe- cial one watt military resist- ance elements. TWO WATT: Entire 35 Ear mounted tandem for series 1 1, 8" diameter line preset applications. available with 95 series spe- Combines panel space cial two watt military resist- saving features of a con- ance elements. centric tandem with the economy of an ear mounted unit. Available in various combinations THE ONLY COMPLETE LINE FOR of composition or wire - wound front and rear sections. CTS type P -C2- 45 with composition front ALL COLOR TV APPLICATIONS and rear sections illus- trated. CTS also makes a complete line of controls for military, black and white TV, radio and other commercial applications. Consultation without obligation available for all your control applications. Write for complete catalog TODAY. EAST COAST OFFICE SOUTHWESTERN U.S.A. SOUTH AMERICA Henry E. Sanders John A. Green Company Jose Luis Pontet 130 North Broadway 6815 Oriole Drive Buenos Aires, Argentina Camden 2. New Jersey P.O. Box 7224 Montevideo, Uruguay Phone: Woodlawn 6-1668 Dallas 9. Texas Rio de Janeiro, Brazil CHICAGO TELEPHONE SUPPLY TWX No. Camden NJ 380 Sao Paulo, Brazil Phone: Dixon 9918 (e iaaiem WEST COAST OFFICE CANADIAN DIVISION OTHER EXPORT Robert A. Stackhouse C. C. Meredith & Co., Ltd. Sylvan Ginsbury 928 S. Robertson Blvd. Streetsville, Ontario 8 West 40th Street Los Angeles 35, California ELKHART INDIANA Phone: 310 New York 18, New York Phone: Crestview 4-5931 Phone: Pennsylvania 6-8239 TWX No. BEV H 7666 eteciaiß4 in Aece4t,ozn e_Wa44 Ace/tedien o '-a2r,'a4.4 tWe4i4444 dumded 1896 X566 20kw High power gain of 53db modulating anode UHF operation - 960-1400mc pulse klystron ...,.x.,.x,,.e».. } EIMAC X566 UHF klystrons have consistently obtained low pulsing power. In Eimac high power amplifier kly- peak pulse power outputs of more than 20kw with over strons using ceramic and copper construction, the reso- 40%j% efficiency at 960-1400mc. Many times more power- nant cavities are completed outside the vacuum system, ful than any other tube intended for similar operation, which is left free of RF tuning devices - permitting such as aircraft navigational aid Distance Measuring easy wide range tuning and uncomplicated input and Equipment, the air-cooled X566 requires only 100 -milli - output coupling adjustment. This simplicity of design watts driving power for a 20kw output -a power gain and rugged construction minimize replacement costs of 53db with bandwidth adequate for most pulse ap- as well as making the Eimac X566 suitable for mass plications. Of special significance is the high average production techniques. power capability of one kilowatt, allowing the duty The X566, another Eimac high power klystron achieve- cycle to be raised 5('/-2 to with a 20kw peak output, or ment, is now available with circuit components for ex- 10% with 10kw output, and so on. Outstanding pulse perimental purposes. capabilities of the X566 are made possible through the use of the Eimac modulating anode - an insulated For additional information, contact anode between the cathode and drift tube section - our Technical Services Department. permitting the klystron to be pulse modulated with THE WORLD'S EITEL-McCULLOOGH, INC. LARGEST MANUFACTURER OF SAN BRUNO CALIFORNIA TRANSMITTING TUBES announcing ... a new source for Permalloy POWDER CORES Here's something to ring bells about, for Magnetics, Inc., the nation's largest manufacturer of tape wound cores, is now licensed by the Western Electric Company to manu- facture molybdenum permalloy Powder Cores. So now Magnetics, Inc. brings to powder core users the same "Performance -Guarantee" which has already provided a major free bonus to users of our tape wound cores, bobbin cores, magnetic shields and magnetic laminations. This is a guarantee of perform- ance to your specifications. "Performance -Guarantee" is your assurance of savings in pro- duction and assembly. It costs you no more . . . our prices are standard in the industry ... so make sure your next permalloy pow- der core order reads, "Magnetics, Inc. Performance -Guaranteed." READILY AVAILABLE Why wait to have your Performance -Guaranteed Powder Core orders filled? Our expanded production facilities can have your order on its way almost as soon as it arrives. And send for our Bulletin PC -103 today so that you're ready to order Performance- Guaranteed Powder Cores as soon as you need them. Write trarsr-- on company letterhead /11 RG/I ET/cS inc. DEPARTMENT TT -19, BUTLER, PENNSYLVANIA 32 For product information, use inquiry card on last page, TELE -TECH & ELECTRONIC INDUSTRIES December 1954 SPA.CE-SAVING SUBMINA} jRF CONNE3TORS Part No. Description 27-1 Plug the ruler tells the 27-2 Jack story... Rece;atacle 27-3 27-4 Jack Bulkhead ,AMPHENoj SUBMINAX RF CONNECTORS 27-5 Feed Through A complete line of 50 and 75 ohm RF connectors, so small that all of Part No. Description the twenty-two connectors in the series easily fit in the palm of your 27-5 Plug 27-8 Jack 27-9 Receptacle hand!-the ruler certainly tells the story of the amazing new AMPHENOL 27-10 Jack Bulkhead 27-11 Feed Through subminax RF connectors! A result of the continuing AMPHENOL development 27-12 Receptacle, Hermetically Sealed work in the field of miniaturization, the new subminax connectors have all the dependable features of their older, larger brothers compressed into Pan No. Description a fraction of the space usually demanded in RF connectors! 27-13 Plug 27-14 Jack The subminax line is exceptionally 27-15 Receptacle complete. Connectors are available 27-16 Jack Bulkhead Through in both screw-on and push -on types in either 50 or 75 ohms. In each design 27-17 Feed there is a plug, jack, receptacle, jack bulkhead and feed through. In addition, Pan No. Description hermetically sealed receptacles are available in the 50 ohm and 75 ohm 27-19 Plug screw -on 27-20 Jack connectors. Construction? Subminax connectors have machined 27-21 Receptacle 27-22 Jack Bulkhead brass bodies with a tough and shining gold-plated finish. 27-23 Feed Through 27-24 Receptacle, Although subminax cable assemblies are available directly from Hermetically Sealed AMPHENOL, assembly at your plant is both easy and practical. Inexpensive Three types of miniature coaxial cable are available from AMPHENOL and easy -to -use hand crimpers are available along with the necessary for making submira.r assemblies. These are 50 ohm and 75 ohm lengths of AMPHENOL Miniature Coaxial Cable. polyethylene dielectric with black vinyl jacket cable and a 50 ohm Kel-F dielectric and Kel-F jacket cable. Part No. RG-; U Mo. Impedance Description _ . . _ . _...... 21-596 50 ohm Kel-F -- 21-597 75 ohm Poly. 21-598 174 50 ohm Poly. depend on AMERICAN PHENOLIC CORPORATION chicago 50, Illinois Akt41PHENo IJtCanada: AMPHENOL CANADA LTD., Toronto for progress! 1 ir Precisior, high-speed viril rig equiDmeit for IRC elms its ONLY IRC WINDING SKILL OFFERS If you seek savings in component costs, IRC's winding skill may serve your need. IRC's mastery of winding wire elements dates back more than 25 years. Today, it provides a wide variety of unique units that offer realistic possibilities for savings. Cost-conscious IRC engineers Wire element its uniformly and tightly wound on an Insulated will glady analyze your requirements. core. Axial leads or other termina- tions are secured to element by automatic machinery. Insulated housing may be used or omitted. 34 For product information, use inqu,ry card on last page, TELE-T:CH & ELPCTRONIC INDUSTRIES December Iv`54 NC MAW encapsulated 14c savings per car Type AW Wire Wound resistors save precision automobile manufacturers an average of 14c per car. For quantity require- ments, these low-cost windings can be resistors made specially to suit individual de- signs. This adaptability has proved profitable to numerous appliance manufacturers. Type WW15M-MIL-R-93A Style RB15 low cost-low wattage Type BW insulated wire wounds offer excellent stability in low ranges-at low prices. Leading instrument manu- facturers attest to their superiority. %, 1 and 2 watt sizes are equivalent Type WW 16M-- MÌL-R-93A to Jan types RU -3, RU -4 and RU -6. Style RB16 50% savings Chokes offer savings up -- IRC Insulated Type WW17M--MIL-R-93A to 50% over ordinary types. Available Style RB17 in two sizes, they are fully protected against humidity, abrasion, assembly damage and danger of shorting to chassis. A favorite source of savings for TV and radio set manufacturers. Type WW18M Style R318 TH ESE SA I NGS inexpensive solution ype WW19M- MI. -R -93A 4 -watt Insulated Power Wire Wounds Style RB19 with axial leads can save several cents over conventional power resistors. Epoxy Resin Compound Used For Inorganic core and high -temperature Both Windingì Form and Seal. plastic housing allow safe operation Exclusive Melding Process Avoids Air up to 165° C. Widely used in toys, Pockets And Assures Uniform Distri- juke boxes and amusement devices. bution Of Resin. e Exceed MIL -R -93A Specifications In 1%, 0.5%, 0.25%, 0.1% Tolerances. SEND COU'ON FOR DATA BULLETIN INTERNATIENAL RESISTANCE CO. B, Boron & Deposited Carbon Precis- 407 N. Broad St., Philadelphia Pa. tors Power Resistors Voltmeter In Canada: International Resistance Co., Ltd., Multipliers Low Wattage Wire Toronto, Licensee Wounds Insulated Composition Resistors Volume Controls Send Technical Bulletins on: Encapsulated Precision Wire Wounds; Insulated Chokes; BW Resistors; D 4 -Watt Power Resistors. Name Title Precision Wire Wounds Ultra HF Company and Hi -Voltage Resistors Low Value Capacitors Selenium Address Rectifiers Insulated Chokes Hermetic Sealing Terminals City State IkG/IYÑJ' P/us./ TEL Regulated Volm9e h p New R (Continued from page 28) PIX TUBE IMPLOSION: Is't possi- ble that so short a time can alter OG the condition of a man? (Corio- PP,v lanus) NEW COMPUTER: He shall have a noble memory. (Coriolanus) TV AUDIO FAILURE: She speaks, - for general laboratory yet she says nothing. (Romeo & Juliet) and production line use STOCK SPECULATION: A fool's paradise. (Romeo & Juliet) - power supply for many ALIBI: The excuse that thou dost low voltage klystrons make in this delay is longer than the tale thou dost excuse. (Romeo & Juliet) TRACKING OF GUIDED MIS- SILES to be aided soon by three powerful optical tracking devices be- ing made by Perkin-Elmer Corp., Norwalk, Conn. Instruments will consist basically of telescopes similar to those employed for astronomical observations but will incorporate rapid sighting properties of modern gun mounts. TITANIUM PRODUCTION at sharply reduced prices may soon be k() in the offing because of a new pow- der metallurgy process according to Dr. Paul A Schwartzkopf, president ------=- .... , Electro Metal Corp., $275.00 f.o.b. N. Y. of the American 320 Yonkers Ave., Yonkers, N. Y. G ound either std Features: The product derived from titanium to +600V Wider than usual output range: scrap may inaugurate a way to drop B SUPPLY '0 at 200 ma at 200 ma. prices from $15. a pound to less than 6500 ohms max. "B" supply 0 to ±600V. common 115 or C- "C" supply 0 to -250V. at 5 ma. one fifth. 230V SUPPLY 0 to -250 V ELECTRONIC at 5 ma Additional fixed supply -250V. at 50 ma. BUILD YOUR OWN 50/60 cps'- ORGAN-A new "home" model or- INPUT Fixed -250V Unregulated 6.3V., 10A. C.T. filament supply single at 50 ma gan has been added to build -it -your- phase Excellent voltage regulation (only ±.25V.) FILAMENT 6.3 V a.c self kit line that Electronic Organ SUPPLY at 10 arra Low ripple (less than 4 mv.) Arts, Box 41084, Los Angeles, Calif. Input 115 or 230 Volts ac, is offering. Designed as a compact 50/60 cps, single phase console it should appeal to home owners having only limited space The PRD Type 807 is a general purpose, available. constant voltage power supply, competi- stacking Flexible ground permits tively priced to fit any instrument budget. HEATING AND AGING have a of supplies to provide up to -600V. of cathode voltage and an addi- It is conservatively rated for continuous marked effect on the stability tional 0 to -250V. for the reflec- service. Panel voltmeter monitors either polystyrene dielectric capacitors. So tor of low voltage klystrons. supply voltage; milliameter indicates "B" reports the Condenser Products Co., supply current. Write for bulletin. division of the New Haven Clock and Watch Co., New Haven, Conn., who also claim that their capacitors RESEARCH which have undergone a heat and aging series during manufacture & DEVELOPMENT CO Inc 202 TILLARY ST. have less than 1.5% overall capacity Chicago Sales Office: change in temperature range of -60° B`KLYN 1, N.Y. PARK RIDGE, ILLINOIS-TAlcol 1 SO. NORTHWEST HWY., 3-3174 tempera- Telephoner Los Angeles Sales Officer C. to 85° C. Formerly this Ulster 2-6800 741t/2 NO. SEWARD ST., HOLLYWOOD 38, CAL.-H011ywood S-5287 ture coefficient was about 2%. (Continued on page 40) 36 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Standard Electronics Corporation delivers ANOTHER TELEVISION AMPLIFIER AH[AP of schedule MORE POWER roWMAZ-TV GUARANTEE CHANNEL 13 transmitters DELIVERIES VHF D sh ppedond Macon, Georgia from °m stock Standard Electro.nics. Cor orat. on ,cNDE A SUBSIDIAR OF CLAUDE N N, 289 EMMETT STREET NEWARK 5, CTRON TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on fast page 37 For long life under extreme conditions of shock, vibration, corrosion, humidity and temperature Igoe/ type HEAVY-DUTY ELECTRICAL CONNECTOR Here is the electrical connector designed and built for maximum per- formance under rugged operating conditions. Intended for use with jacketed cable and not requiring ground return through mating surfaces, this connector incorporates sealing gaskets at all mating joints. SCINTILLA DIVISION W -Type Bendix* Connectors also incorporate standard Scinflex resil- ient inserts in established AN contact arrangements. Shell components are 117énee/ thick -sectioned high-grade aluminum for maximum strength. All aluminum surfaces are grey anodized for protection against corrosion. SIDNEY, NEW YORK For the real tough jobs, be sure to specify the W-Type Electrical Connector. Our Sales Department will gladly furnish complete specifica- tions and details on request. *TRADE-MARK Export Sales: Bendix International Division 205 East 42nd Street, New York 17, N. Y. FACTORY BRANCH OFFICES: 117 E. Providencia Ave., Burbank, Calif. Stephenson Bldg., 6560 Cass Ave., Detroit 2, Mich. 512 West Ave., Jenkintown, Pa. Brouwer Bldg., 176 W. Wisconsin Ave., Milwaukee, Wisc. American Bldg., 4 S. Main St., Dayton 2, Ohio 8401 Cedar Springs Rd., Dallas 19, Tex. 38 For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 L NEW: L VIDICON FILM CAMERA CHANNEL HIGHEST FILM PROGRAMMING QUALITY TO TOP L COMPETITION ...BUILD SPONSORED TIME YOUR STATION AUDIENCE will be vitally aware of the quality difference between G -E Vidicon film reproduced pictures and any other system. Only a keen eye can distinguish this from live program reproduction. And, it has many more benefits you'll recognize. First, since shading controls and the need for them have been eliminated, your operators can de- vote full time to other video duties. Next, this highly flexible film technique accommodates a variety of projected -image SIS systems. There's a choice of channel amplifier mounting tYPE GHAs - ... gpCK either in a standard rack or in the camera stand. 'N ON Ú t FUNCSIONs Examine each stand -out feature of the G -E Vidicon Film pll p0 FILIA L and decide here is the only channel OR vOPOPAQUES A Camera Channel you'll A NEGATIVç SLIDES that lives up to modern day TV standards. General Electric HANDLES LEXEDPLUS r MULt1P Co., Section X48124, Electronics Park, Syracuse, N. Y. In sKILLFUOE Canada, write: CGE Electronics,830 Lansdowne Ave., Toronto. pIREGZ DYNAMICFOCUEINGPOCAS) FEAtUitEs VEC E 11MpR0 L O Plan view of new G -E "Optiplexer" setup. óóEi ni sJA 39 FROM LENS VERTEX% OF FOUR PROJECTION TO RELAY LENS CAPABLE HANDLING SOURCES as illustrated at left in conjunction with the new G -E "Optiplexer". By using this PLANE .o°aÉLFILM:MLENs highly efficient optical system there's no need r= .7 OPTICAL MULTIPLE%ER to flip mirrors! And, the new G -E Vidicon chan- IZPRÓJL I Ii0`LENS CAÑER4 a choice of Studio con- v v óm nel offers monitors...1. ADJUSTABLE - RELAY LENS VERTEX sole type. 2. Lightweight portable design. WHITE OPAGJE / PRE -FOCUS SCREEN 'Progress /5 Our Most /mportant Product . = SLIDE PROJECTOR AND TWO PF -S -APRO- INTERCHANGE - ABLE ° PHYSICALI Y WITH ONE ANOTHER PROJECT ION DISTANCES ARE APPROXIMATE NO OR INITIAL SETOP USE ONLY GENERAL( ) ELECTRIC I TELE -TIPS i1111üi (Continued from page 36) SMALL BUSINESS FIRMS are be- ginning to suffer acutely through the retraction of large quantities of sub- contract work for military aviation building. While the Small Business Administration maintains that it is doing all that it can to assist, there appears to be no immediate solution to the growing problem. Delay in bringing Air Force up to 137 -wing strength for two years plus discon- tinuance of manufacture of certain aircraft types are major causes of contract retractions. DO-IT-YOURSELF trend has now expanded to become a low cost method of speeding in -plant com- munications. The Lamson Corp. of RADIO INTERFERENCE Syracuse, N.Y. has developed a pre- fabricated 2 -station pneumatic tube and FIELD INTENSITY* system, in kit form, that can be in- stalled in any type of building by measuring equipment regular maintenance personnel. KNOCKING THE JOB-some 20,000 times each day soon will be over for 165 girls at GE's Owensboro, Ky., NM -10A 14kc to 250kc tube plant. The light cork mallets to sfoddarf check for short circuits are being re- Commercial Equivalent of AN/URM-6B placed by automatic, solenoid -oper- ated "rappers" on each test set so VERSATILITY...The NM -10A is designed to meet the most exacting labora- girls can concentrate only on read- tory standards for the precise measurements, analysis and interpretation of ing test set dials. VLF radiated and conducted radio -frequency signals and interference. Thoroughly portable, yet rugged, the NM -10A can be supplied with acces- SUBMARINE EARS in the form of sories to fulfill every conceivable laboratory and field requirement. rubber panels developed by B. F. EXCELLENT SENSITIVITY...The NM -10A sensitivity ranges from one micro- Goodrich form part of the hull for the volt -per -meter to 100 microvolts -per -meter, depending upon whether rod USS Nautilus and house sonar gear or shielded loop antennas or line probe are used. for the detection of surface and ACCURACY... Each equipment is "hand calibrated" in the Stoddart Test undersea craft. Installed fore and aft, Laboratories by competent engineers. This data is presented in simplified the "ears" share characteristics of chart form. ocean water, thereby preventing DRIPPROOF... Sturdy dripproof construction allows long periods of opera- distortion of sonar signals. tion in driving rain or snow without adverse effects. COMPUTERS FOR DICTION- FLEXIBLE POWER REQUIREMENTS ...The ac power supply permits opera- ARIES. The University of Chicago tion from either 105 to 125 volts or 210 to 250 volts ac, at any frequency reports that scholars are wondering 50 cps and 1600 cps. between if some of the essential steps in mak- Stoddart RI -Fl* Meters cover the frequency range 14kc to 1000mc ing a dictionary cannot be by-passed with the use of the new high speed HF NM -20B, 150kc to 25mc VHF UHF Commercial Equivalent of NM -30A, 20mc to 400mc NM -50A, 375mc to 1000mc computing machines. When the AN/PRM-1A. Self-contained Commercial Equivalent of Commercial Equivalent of largest commercially published dic- t-atteries. A.C. supply optional. AN/URM-47.. Includes standard broadcast Frequency range AN/URM-17. Frequency range includes FM and TV bands. includes tionary in the U.S. was made only band, radio range, WWV, and Citizens band and communications frequencies. UHF color TV band. two fifths of the entries available in Has BFO. the files ever reached print. To revise it in any major form would cost ten million dollars and it would take STODDART AIRCRAFT RADIO Co., Inc. one person an estimated fifty to proof-read 6644-G Santa Monica Blvd., Hollywood 38, California Hollywood sixty years to this large 4-9294 dictionary. For product information, use 40 inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 t2f Pe, woei t ít svor t Near-sighted or not, our snake charmer friend should know he can get more out of a wire if it has a well soldered connection. How do we know that? Well, making the right kind of flux core solder for every application has been Kester's sole business for more than 50 years. There's no mystery about Kester Solder, no secret ingredients either. With Kester, quality is the paramount feature ... the same today as it's always been. TRIPLE -PLAY! Kester "44'" Resin .....Resin -Five'" . . Plastic Rosin -Core Solder ... your best bets ... with exact core size or flux -content and alloy "tailored" to your requirements. KESIE SOLDER C O M PAN Y 4210 WRIGHTWOOD AVENUE, CHICAGO 39, ILLINOIS NEWARK 5, NEW JERSEY BRANTFORD, CANADA WRITE TODAY for Kester's NEW 78 -Page Informative Textbook, "SOLDER ... its fundamentals and usage" TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 41 Amok/ Pu/se Tm#tmet Co/es ewe índitfídua/1y tested under actrra/ pulse coed/Woes W&D 8238 The inset photograph above illus- pulses per second, at a peak flux trates a special Arnold advantage: a density of 10,000 gausses. 10 -megawatt pulse -testing installa- The test equipment has a variable tion which enables us to test -prove range which may enable us to make pulse cores to an extent unequalled special tests duplicating the actual elsewhere in the industry. operating conditions of the trans- For example, Arnold i mil Silectran former. The pulser permits tests at WRITE "C" cores-supplied with a guaran- .05, .25, 2.0 and 10.0 microsecond teed minimum pulse permeability of pulse duration, for your at repetition rates 300 are tested at 0.25 microseconds, varying anywhere from 50 to 1000 COPIES 1000 pulses per second, at a peak flux pulses per second. density of 2500 gausses. The 2 mil This is just another of Arnold's cores, with a guaranteed minimum facilities for better service on mag- "MAGNETI C MATERIALS CATALOG" pulse permeability of 600, receive netic materials of all description. General information on all Arnold standard tests at 2 microseconds, 400 Let us magnetic materials: permanent mag- supply your requirements. nets, tape -wound and powder cores, types "C" and "E" cut cores, etc. THE ARNOLD ENGINEERING COMPANY "ARNOLD SILECTRON CORES" 52 pages cf valuable data covering a SUBSIDIARY OF ALLEGHºNY i.UDLUM STEEL CORPORATION complete range of core shapes, sizes, tape gauges, etc. General Office & Plant:.Mcrengo, Illinois ADDRESS DEPT. T-12 DISTRICT SALES OFFICES ... New Yo -k: 350 Fifth Ave. Los Angeles: 3450 Wilsii-e Blvd. Boston: 200 Berkeley St. For product information, 42 use inquiry tard on as page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Subminiatur Toroid HIGH PRODUCTION PROTOTYPES ENGINEERING DEVELOPMENT RESEARCH C -A -C TRANSISTOR TRANSFORMERS Consistent with advanced engineering in subminiaturization, CAC offers transistor transformers in hermetically sealed cases, molded or cast type construction-designed to meet military requirements- temperatures (- ) 55° C to (-t-) 105° C. Enclosed magnetic field afforded by toroidal form. Frequencies and impedances to your specifications ... utilize our advanced engineering and modern high speed production facilities. See your CAC representative now. TYPISkää Pjjj.StajlANSWRMER Illielataillikallikularevemilli RING Br 3 ,OM B Inn 3 a26 1111 8 2.5 31J: $ 0 Ina! Design A TYPICAL PULSE TRANSFORMER-ONE OF MANY CUSTOM DESIGNS DEVELOPED BY CAC ENGINEERS -- HIGHLY -STABLE 10ROIDAL UNITS - EXHIBIT EXCELLENT CHARACTERISTICS KEEP YOUR DESIGNS AHEAD WITH CAC SUBMINIATURES ERS, C . '. :,t._._ITOR AND P .....IIll..... Subminiature Filters 1IIe11uoI I1II1. FOR TELEMETERING r 111.1_, 12 DB 1111 AND AIRBORNE EQUIPMENT IL1 45 DB n45 U1,111111113II1111IBII11 1211 '.3133SN!IIINIi 1=I1211 1113 Mann« II . i WRIAMIIIN VÁ1112 11INIZOINILIIWWAV IU 121 _, 1 1111111111MIWIMIZI 111111MioJIi , - 3 230C 3000 3900 5400 r39 1C5K 14SK FREQUENCY IN CPS FREQUENCYI .55 CUBIC INCHES AND LESS. STANDARD LOW PASS SERIES -. DESIGNED EXCELLENT BPND PASS CHAR- & PACKAGED 10 MIL T27 SPECIFICATIONS - OFFERS OVER 45 db ABOVE ACTERISTICS - DESIGNEC TO f. if, r 1.5 fi). HERMETIC SEALED-STUD MOUNTED -TEF- MIL SPECIFICATIOCIS IDEAL LON TYPE TERMINALS. CIGARETTE SIZE MULTI CHANrEL OPERATION. PACKAGE. 3, 6, 10 & 15 KC STD. UNITS. ALSO AVAILABLEi IN SUBMINIATURE VERSION. FON ADDITIONAL INFORMATION CONTACT COMMUNICATION ACCESSORIES COMPANY FIQKMAN MILLS, MISSOURI PHONE KANSAS CITY. SOUTH 5528 TEi.E-TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 43 `tN.\\\\\\q,,NNNN..- .,. \ .s\ J SWITCHES and COMMUTATORS PRINTED CIRCUITS FOR ELECTRONIC APPLICATIONS Let Electralab quote on your next requirement for .. . ETCHED CIRCUITS PLATED CIRCUITS RADIO RECEIVERS DIE STAMPED CIRCUITS .. Why don't you take advantage of Electralab's t engineering facilities before you design or re -design your products? Send for our new engineering brochure. -E LEEiR-ALAS INCORPOR A TED A subsidiary of Farrington Manufacturing Company 78 Atherton Street, Boston 30, Massachusetts I. 44 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 NOW SYLVANIA PRESENTS a Full Line of PENCIL TUBES These improved Sylvania tubes are manufactured and quality controlled for highest dependability. Now for the first time they enable circuit engineers to meet precisely the ever -widening range of today's application requirements. 5675 a low Mu tube for CW operation to 3000 cycles as an amplifier, oscillator, or frequency multiplier in either lumped, constant, or external cavity -type circuits. De. livers 300 mw average power at 1700 megacycles. 5794 designed for continuous wave operation, this tube oscil- lates inside a cavity tuned to a fixed frequency of 1680 megacycles. This low Mu tube with its special heater at 5.2 volts is capable of delivering a power of 300 milli - watts. is a high Mu triode designed for continuous wave opera- 5876 tion up to 3000 megacycles in either lumped, constant, or external cavity -type circuits. 5893 for pulse operation to 3400 megacycles. Will deliver .750 KW peak minimum at maximum frequency with .001 duty cycle. 6263 a low Mu high power tube for application as an ampli- fier, oscillator to 1700 megacycles. Plate input power is 22 watts and plate dissipation is 13 watts. a medium Mu frequency multiplier version of the 6263 6264 with the same plate characteristics. The attached coupon brings you full engineering data and characteristics of Sylvania's complete pencil tube line. "Another reason why it pays to specify Sylvania." Products Inc. Sylvania Electr4412,c Broadway Dept. 4E-4412, 1740 19, N. Y. New York data me complete engineering Please send of Sylvania Pencil sheets covering the full line SYLVAMA Tubes. In Canada: Sylvania Electric (Canada) Ltd., University lower Building St. Catherine Street, Montreal, P. Q. Name Street Zone State City LIGHTING RADIO ELECTRONICS TELEVISION ATOMIC ENERGY TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 45 12,800 TO 50,000 MC integrated equipment for xtremely SIGNAL igh GENERATORS frequencies Now, Polarad has applied its advanced engineering techniques to SIGNAL produce fully self-contained microwave test equipment for use in the SOURCES Extremely High Frequency region --12,800 to 50.000 MC This new line of Signal Generators, Signal Sources, and Spectrum Analyzers is designed to save engineering manhours in the laboratory and on production lines-obviating experimental test set-ups. The Extremely High Frequency Polarad Signal Generator, for example, furnishes monitored power output as well as measures external signal strength and frequency. SPECTRUM Highest accuracy and reliability of operation are assured by ANALYZERS careful engineering and the use of highest quality components. For complete information write to your nearest Polarad representative or directly to the factory. SIGNAL GENERATORS SIGNAL SOURCES SPECTRUM ANALYZERS Frequency Range Model Number Output Power Model Number power Output Model Number Sensitivity OA (Average) (Signal=Noise) (Average)vera 12.8 to 17.5 KMC SG 1218 -10 DBM SS 1218 15 mw SA 1218 -70 DBM 30 MC 15.75 to 16.25 KMC SG 1516' -6 DBM SS 1516 5 mw SA 1516 -70 08M 45 MC 16.25 to 16.75 KMC SG 1617* -6 DBM SS 1617 5 mw SA 1617 -70 DBM 45 MC 18.0 to 22.0 KMC SG 1822 -10 DBM SS 1822 10 mw SA 1822 -60 DBM 40 MC 22.0 to 25.0 KMC SG 2225 -10 DBM SS 2225 10 mw SA 2225 -60 DBM 40 MC 24.7 to 27.5 KMC SG 2427 -10 DBM SS 2427 10 mw SA 2427 -60 DBM 40 MC 27.27 to 30.0 KMC SG 2730 -10 DBM SS 2730 10 mw SA 2730 -60 DBM 45 MC 29.7 to 33.52 KMC SG 3033 -10 DBM SS 3033 10 mw SA 3033 -60 DBM 45 MC 33.52 to 36.25 KMC SG 3336 -10 DBM SS 3336 9 mw SA 3336 -50 DBM 45 MC 35.1 to 39.7 KMC SG 3540 -10 DBM SS 3540 5 mw SA 3540 -50 DBM 45 MC 37.1 to 42.6 KMC External Source Power Measurement SS 3742 Approx 3 mw Range: +6 to +30 DBM I.F Gain Control: 0 to 40 DB 41.7 to 50.0 KMC Accuracy with Correction, ±2 DB SS 4150 Approx. 3 mw I.F Band Width: 50 KC Modulation: All units except the SG 1516* and SG 1617* can be modu- lated as follows: Sweep Frequency: 5 to 40 CPS 1. Internal 1000 CPS Square Wave 2. External a. Pulse Pulse Width: 0.5 to 10 Microseconds PRF: 100 to 10,000 CPS Pulse Amplitude: 10 volts Pk to Pk Min. Polarity: Positive b. Sawtooth or Sinusoidal Frequency: 100 to 10,000 CPS Amplitude: 1.5 Volts RMS Min. *Internal variable pulse and FM modulation ELECTRONICS CORPORATIONid» 100 METROPOLITAN AVENUE, BROOKLYN 11. NEW YORK REPRESENTATIVES - Albuquerque Atlanta Boston Chicago Cleveland Fort Worth Kansas City Los Angeles New York - Phila- delphia San Francisco Seattle St. Paul Syracuse Washington. D. C Canada. Arnpricr-Export: Rocke International Corporation 46 For product information, use inquiry card on last page, TELE -TECH & ELECTRONIC INDUSTRIES December 1954 "THIRD DOWN...SIX TO GO!" "Van called a 57X ... We split the specs" for this recorder in a nation- tures: Fast forward and reverse at line wide open and went for a touch- wide survey that resulted in this any speed. Instantaneous Reeloks. down." outstandingly rugged and depend- Automatic cut-off. Tape tension A Monday morning quarterback able machine. The BR -1 was spe- arms. Adjustable bias ... and three interview with Los Angeles Rams' cifically designed to serve you better, motors. both in the studio and in the field. star end, Tom Fears, is recorded dur- All of the above is what you, the ing a practice session for broadcast Its roster of exclusive features in- engineer, wanted. The man in the at a more convenient time. cludes: PROVISION FOR FIVE HEADS figure department wanted depend- (three are standard) : an optional The engineer -interviewer is Bert ability and low maintenance cost switching arrangement Berlant, designer-manufacturer of allows both ... at the right price! We listened the Berlant Broadcast Recorder single and dual track operation. to him, too. UNISYNC DRIVE: a completely new BR -I, which is being used here. $545 IS THE PROFESSIONAL USERS hysteresis synchronous direct drive NET FAIR TRADED PRICE. A coordinated combination of tape with 99.8 % timing accuracy and recorder and 4 -channel mixer in two total temperature rise of 30 degrees. You'll want to test it yourself, we know. matched portable cases made easy UNIFIED CONTROL: one simple con- For a distributor close to you, for work out of a one-man recording job venient error -proof lever system. more complete technical bro- chure, write: in the field. A -B TEST FADER: fades from incom- Berlant Concertone Jefferson "Operational simplicity" was one of ing signal to playback without 4917 West Boulevard, Dept. i3 the things insisted upon by 382 radio transients or clicks. D Los Angeles 16, California station engineers who "wrote the And these additional requested fea- THIS IS REPORT NO. 2 IN A SERIES OF FIELD TESTS. Manufacturers of Concertone...world's foremost high fidelity recorders and accessories. LETTERS... Stop Wasting Engineers! Editors, TELE-TECH Thanks very much for sending me the TELE-TECH editorial on "Stop SPECIALISTS IN Wasting Engineers!" so promptly. It certainly contains some thought pro- voking information on a very im- portant subject. MINIATURIZATION Harris Reinhardt Manager, Organization Development Sylvania Elec. Prods. Inc. 1740 Broadway New York 19, New York Editors, TELE-TECH Your editorial, "Stop Wasting En- gineers," is excellent and more of this type information should be pre- sented. If possible, I would certainly ap- preciate about 15 tearsheets of the article for discussion with California Senators Knowland and Kuechel. You may have noticed Represen- tative Hinshaw has started logical thinking in terms of push button operations. This article will also be brought to his attention. Unfortunately the ASME and other societies are very slow and ` _ d! a unaware of current events. Some of 11 Examples of Miniaturization your short articles in the past have a them. by Stonized been forwarded to Jud E. White Thirty years' experience in the precision manufac- 511 Walnut Ave. ture of small diameter spiral wound paper tubes Burbank, Calif. gives Stone a decided advantage in the important Ed note: Mr. White is Divisional En- movement to miniaturization now going on in the gineer at General Controls Co., electronics and electrical fields. Glendale, Calif. and associate mem- Stonized, our phenolic impregnated tube, when ber of Republican State Central used as a coil form, has low moisture absorption Committee. characteristics (5% after 24 -hour immersion), low power factor, and good insulation resistance. Editors, TELE-TECH Stonized bushings combine extremely high com- I have read with deep interest pression strength with resiliency. your September editorial titled Stonized thin wall insulating tubes can be precision Engineers." ex- walls .006" "Stop Wasting It engineered and manufactured down to of presses most lucidly several senti- with ID's ranging from .046" to 1 ". ments I have long positively entertained, These examples of Stone's craftsmanship which are based, I might add, on illustrate what you may expect when your order calls several years of varied experience for a rigid meeting of your specifications. in military electronics engineering. Write or phone us directly. We will be happy to There is, of course, no simple an- have one of our conveniently located representatives swer to this complex problem. How- call on you. ever, I do believe that realistic guid- ing policies of positive nature should be established by organizations such as the Scientific Manpower Com- mission. I further believe that Con- gress would require these policies to be followed if they were aware of St0nePAPER TUBE CO. the great dangers in the existing AFFILIATED WITH situation. At the present time, it ap- pears that most of Congress does not realize the long range implications STONIZED PRODUCTS CO. INC. of our current practices relative to 900-922 Franklin Street, N.E., Washington 17. D. C. (Continued on page 52) 48 For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Behind every piece of tape NEW equipment are these PRESTO PRESTO SR -11 R-11 PRESTO "extras"- painstaking craftsmanship, Complete studio console tape recorder. Never before so much quality, operational A tape recording mechanism of truly modern years of experience... ease and value at such a modest price. design in engineering and operation. Mech- Embodies the famous PRESTO R-11 tape anism includes three -head assembly, sole- mechanism, matching amplifier - power noid operated brakes and employs the quality control ...and supply in sturdy well -designed console cab- exclusive Capstan drive unit. Tape reels inet. Three motors for complete flexibility; mounted directly on heavy-duty torque advanced production 15" and 7t/_," per sec. speeds. motors. facilities that guarantee instruments of absolute precision and lifelong PRESTO PRESTO dependability. R-7 PB -17A Rugged, portable tape recorder with separate Reliable, long-playing tape reproducing recording, reproduction, and erasing heads. mechanism. Automatically reversible for Built around a sturdy, three -motor drive continuous playback for background music eliminating friction clutch, the RC -7 con- in eight hour cycles. Frequency response RECORDING CORPORATION tains the same high -quality components uniform from 50 to 8000 cps. Tape speed: PARAMUS, NEW JERSEY found in PRESTO'S fine studio equipment. 33/" per sec. Reels up to 14" diam. (4800' Heavy-duty construction throughout. of tape) with dual track. Export Division: 25 Warren Street, New York 7, N.1 Canadian Division: Instantaneous Recording Service, 42 Lombard Street, Toronto WORLD'S LARGEST MANUFACTURER OF PRECISION RECORDING EQUIPMENT PREST.O PRESTO AND DISCS 900-A TL -10 MAIL THIS COUPON TODAY Precision tape amplifier for portable use or rack mounting. Composed of individual Presto Recording Corporation record and reproduce (monitor) amplifiers Turntable -driven tape reproducer. Unique, Tape Equipment Sales Div. on a common chassis: separate power sup- loe -cost unit that adapts any 16" turntable ply: three -microphone input, 250 ohm low for reproduction of tape at 7t/2"/sec. or Paramus, New Jersey level mixer: illuminated V.U. meter. Out- 15"/sec. with exceptional accuracy. No put of reproduce amplifier, 500 ohms, plus pre -amplifier required; plugs into standard Please send full information and prices on 20 db maximum. May be used with any studio speed input equipment. .model PRESTO tape recorder. the following Presto tape equipment: SR -11 Tape Recorder D PB -17A Tape Recorder R-11 Tape Transport D TL -10 Tape Reproducer R-7 Tape Recorder A-920 Tape Amplifier I 900-A Tape Amplifier CDR -200 Capstan Drive PRESTO CDR -200 NAM E PRESTO A-920 CAPSTAN DRIVE UNIT COMPANY More compact than the 900-A. In carrying case or for rack mounting. Consists of ADDRESS Heart microphone preamp, a reproduce preamp, of all Presto tape recorders and re- producers. Motor, capstan and flywheel, power amplifier and power supply - all on CITY -ZONE a common chassis. Two small speakers pressure pulley and pressure pulley sole- mounted behind front panel for playback. noid are mounted on independent cast Single mike input: 250 ohms. Playback aluminum chassis. Positive, very quiet tape STATE output: 15 ohms, 10 watts. drive with minimum of parts. 1 a I i to see why leading industries specify ADLAKE Mercury Relays wherever sensitivity and dependability are vital! ADLAKE Mercury Relays have won their place by proven dependability in jobs which conventional relays can do in an uncertain manner at best. For instance, they have proved their ability to stand up under the most adverse conditions of temper- ature and moisture ... normal line voltage fluctuations or ambient tem- peratures from -38.8° to +200° F. have no material effect on their time - delay characteristics. What's more, every ADLAKE Relay is hermetically sealed ... absolutely maintenance -free ... always silent and chatterless. And ADLAKE'S mer- cury -to -mercury contact provides an ideal snap action. Yes, wherever sensitivity and de- pendability are required, ADLAKE EVERY ADLAKE RELAY GIVES YOU THESE PLUS FEATURES: Mercury Relays can do the job best! Send for the ADLAKE Relay catalog HERMETICALLY SEALED-dust, dirt, moisture, oxidation and temperature changes can't today ... no obligation, of course. interfere with operation. The Adams & Westlake Company, 1175 N. Michigan, Elkhart, Indiana. SILENT AND CHATTERLESS REQUIRES NO MAINTENANCE ABSOLUTELY SAFE In Canada, address Powerlite De- MERCURY -TO -MERCURY CONTACT- prevents burning, pitting and sticking. vices, Ltd., Toronto. And every ADLAKE Relay is tested-and guaranteed-to meet specifications! THE Adams COMPANY & Westlake 97year `h 'J of serving the transportation Established 1857 EIJ(HART, INDIANA New York Chicago and building industries Manufacturers of ADLAKE Hermetically Sealed Mercury Relays 50 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 "Precision airborne communication equipment must have a dynamotor of consistently reliable quality . . that's why we specify Winco." says Mr. Paul Wulfsberg, Ass't. Director Engineering and Research Cedar Rapids, Iowa. WINCO DYNAMOTORS are manufactured on a wide range of rugged frames that allow for broad design applications. Winco engineers have a decade of experience in successfully de- signing dynamotors to rigid military and com- mercial specifications. They tackle each power conversion and/or supply problem individually, either modifying a standard Winco machine, Collins 18S Transmitter/Receiver, or designing a special unit to meet your exact used for reliable HF communica- tions in major air -lines and execu- requirements. Winco specialists then plan its tive aircraft uses a Winco-Engin- manufacture on a production basis to keep costs eered Frame 51 Dynamotor. down and final performance quality at its best. Winco dynamotors are lightweght, compact and totally enclosed and ventilated. Precise static and dynamic balance is assured by the most modern machines - each dynamotor is thor- oughly tested with periodically calibrated pre- cision meters. SEND THIS COUPON TODAY for complete information on how Winco can supply you with reliable, efficient dynamotors and power supplies produced in volume at low cost. ihm POWER for the Nation's Mobile Communications To Wincharger Corp., Sioux City 2, Iowa. Send me the facts on Winco Dynamotors and Power Supplies WINCHARGER Name______ Company _. CORPORATION Address Sioux City 2, Iowa City_._ State Coupon No. 168 Subsidiary of ZENITH Radio Corporation TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 51 1 ti LETTERS .. . (Continued from page 48) technical and scientific manpower. Why don't you perform another service and direct reprints of your excellent editorial to individual con- a "HOT TIP" for gressmen? Perhaps it would serve to stir some constructive action by influential and responsible members. I am sure that many of our legisla- better soldering! tors are very much interested in the problem, and that your comments would be most welcome. Again my appreciation for your editorial, and also for a very fine publication. C. H. Blackerby The Years Ahead Editors, TELE -TECH I have read with great interest, in the October issue of TELE -TECH & ELECTRONIC INDUSTRIES, Dr. Alfred N. Goldsmith's paper, "The Years Ahead." It seems to me that this kind of forecasting is an essential element in the intelligent manage- 3118 ment of any modern industry. The for FINE whole electronics industry, for many years, has benefited from the fore- soldering 3138 sight Dr. Goldsmith has provided. for MEDIUM It must have required courage and a bit of gambling instinct, as soldering as make his 3198 well foresight, to pre- dictions and to let them be pub- for HEAVY lished. Perhaps he could be reason- soldering ably safe in predicting the broad trend of future developments, but there must be almost infinite possi- use bilities for surprises in predicting fimerictin Betiuty details. In any case, Dr. Goldsmith's pre- ELECTRIC SOLDERING IRONS dictions are stimulating and, since they are based upon years of obser- The Tip . . . That's where American Beauty Electric vation and practical experience, Soldering Irons "pay off" in economy, dependability, have a good chance of being accu- rate. In fact, by predicting develop- efficiency-on all your soldering jobs. ments which were possible, he often Made of commercially -pure copper rod, heavily nickeled has provided the inspiration which to resist corrosion and oxidation, there are American caused them to be accomplished. Clarence W. Hansell Beauty tips in many special shapes and sizes available Radio Corp. of America to fit particular requirements. RCA Laboratories Rocky Point, N. Y. All 12 models of American Beauty Electric Soldering Irons feature tip lengths proportioned to size to permit full insertion into the element core and maximum soldering length. High Frequency Measurements Confab American Beauty Electric Soldering are available Irons The fourth meeting of the Confer- in Tip Sizes from %" to 1 %" and in wattages from ence on High Frequency Measure- 25 to 550. ments will be held on January 17, 18 and 19, 1955 in 'Washington, D.C. Write For Descriptive Literature Headquarters will be at the Hotel Statler and sessions are to be held AMERICAN ELECTRICAL HEATER COMPANY Inen'cnn1l in the Department of Interior Audi- torium. The 1955 meeting will be No.143-H DETROIT 'ERR,S YOUNG 2, MICHIGAN pB / B6 (Continued on page 166) 1954 52 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December Miniaturized Series 49 wire -wound "Illunsdnger" Series controls in single and dual units. 10 MH uhtra-compact po- to 20,000 ohms. t.5 wctts. Switches tentiometer. 10 to available. 2000 ohms. I watt, Series 58 3 -watt wire -wound "Hu mdü n get ries 39 co -tra&. 1 to 50,000 ohms sIaftless, screwdriver- WG -h or without switch. adjusted poentiom- e'er. 4 to 5800 ohms. 2 wet -s. Your wire-wound control needs - usual or unusual -are readily met by specifying CLAROSTAT. Here's why: For usual needs, the Clarostat line is outstandingly complete. It includes 2 -watt (1-1/8" dia.), 3 -watt and 4-watt (1-21/32" dia.) types; 25- and 50 -wit: power rheostats; miniaturized (3/4" dia.) 1.5 -watt controls; and the handy, space - Wire- saving, cost -reducing "Humdingers"*. All these types, and many more, are standard and stocked, available for your convenience at the local Clarostat distributor or in quantities Wound from Clarostat factory stock. And for unusual needs, Clarostat can design CONTROLS and put into production those special types - quickly, satisfactorily, economically - often based on ingenious adaptations of standard features and tooling. Send those wire -wound control requirements to us for 43c engineering service and quotations. Literature on request. 6K S¿ Pcwer hreostats, Series 25 curd 50 25 and 50 watts. Smaller or Series 43c 2 -watt 5,0(0 aed 10,000 ohms max.. wire -wound controls. 5 to respect"voly. 51:1K ohms With or without j;` Also aircraft switch. type, ercased in metal Series 10 4 -watt wire-wound housing controls. 1 to 100,000 ohms. With or without switch. r CLAIIO STAT CLAROSTAT MFG. CO., INC., DOVER, NEW HAMPSHIRE Rep. U. S, i%t. Office In Canada: Canadian Marconi, Co., Ltd., Tcrono '7, Ont. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product Information, ete Inquire yard on last page. 53 60 N N A A W W N N u' N O N O N O N O O O Ó o o o o Ó o Ó 55 new... SERIES "E Z 16" EASY RELEASE precision 50 ContinentaL 45 Ccnttecto14 simplify your connector problems 40 25 ERIES "SM -20" SUBMINIATURE Printed Circuit Connectors Series P-C-With 6,10,15,18, 22, and 28 contacts in single or double rows Answers the need for a positive, space -saving connection 20 between printed circuitry and conventional wiring. Per- mits direct connection to a printed circuit"plug" mounted sub-assembly. By specifying 28 contacts in a double row connector and using both sides of the printed circuit card you have provision for up to 56 individual connec- tions for #16 AWG wire. 15 Series P -C Connectors can be custom built to suit any card thickness, and are available in Mineral filled Melamine, Plaskon Reinforced (glass) Alkyd type 440-A, and Diallyl Phthalate (blue) insulating materials. SERIES "H-20" HERMETIC SEAL Write for Engineering Literature, Series P -C, to Department 10 Electronic Sales 5 ** SERIES "C 20" H¡EXr,; "'::.I Division DeUR / BREAKDOWN VOLTAGE-VOLTSIII1 RM5 45-01 Northern Blvd., Long Island City 1, N. Y. l ///L- -. S4 For product Information, use Inquiry card on lost page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 CORPORATION MA NVQFACTuR 'NG pTIC vaRn,-",ov9"NN.`o, (TOM w'ww tl00 -A alij..,ai,d and ete.,oiltt9bane eowdets niíotmit9 cess TOT 'icon 4nantit¿y excellent, pge ' .qie Catbonyl Qeóial1 .c. P. If. deaeloQ best 04 G to ttemely is ttie e. that into Qóaúction, yn cote desin a comQ enable1ettical i á á. toS TN t. et the i1éled tYou bo r megea btainale s\ so 1aty Qeog1Vse and à dm\ oee e s O,RZpN anp° ts by co clima latßet aStet FQ.CTß1NG '1.x% VAn only so OIAPZC 4tesiden'' IS A FACTOR G A & Po CARBONYL IRON POWDERS. THE K-TRAN-made by Automatic Manufacturing Corporation coils, to confine stray fields and to increase transformer coupling -measures only %" across. Yet it is available in RF and IF trans- factors. The Carbonyl Process assures the quality and uniform- formers covering frequency ranges from 20 KC to 30 MC and ity of each type. higher! For its size, it covers the widest range of uses in the IF We urge you to ask your core maker, your coil winder, your in- field-and with unsurpassed stabilities... . As indicated, the dustrial designer, how G A & F Carbonyl Iron Powders can in- makers credit K-TRAN's success, in large measure, to the con- crease the efficiency and performance of the equipment or trolled uniformity of G A & F Carbonyl Iron Powders. product you make, while reducing both the cost and the weight. We also invite inquiries for powders whose performance char- Today there are ten types of iron powders made by the Carbonyl acteristics are different from those exhibited by any of our Iron Process-with the particle sizes ranging from 3 to 20 microns existing types. in diameter. The iron content of some types is as high as 99.6 to 99.9%. This 32 -page book offers you the most comprehensive treatment yet given to the characteristics and applications of a.n,i:.- With quite different chemical and physical characteristics, the G A & F Carbonyl Iron Powders. 80% of the story is told with n a... photomicrographs, diagrams, performance charts and tables. ten types lend themselves to many different uses- to increase Q For your copy-without obligation-kindly address Depart- values, to vary coil inductances, to reduce the size of ment 92. ANTARA ANTARA® CHEMICALS A SALES DIVISION OF GENERAL ANILINE & FILM CORPORATION From Research to Reality tupa 435 HUDSON STREET NEW YORK 14, N. Y. Atr nSKnaq TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product Information, use Inquiry card on last page. 55 INDUSTRY doell EBY offers ` NEWS Robert A. McGinnis has been elected A COMPLETE to the position of vice president and general mgr. of American Lava Corp. subsidiary of Minnesota Mining & Mfg. PRINTED CIRCUIT Co. Mr. McGinnis had previously been manufacturing mgr. of 3M's interna- tional division. / James P. Buckley has SERVICE been named to the new position of regional sales mgr. on the West Coast for 4 divisions of Bendix Aviation Corp.-Eclipse Pioneer Div., Red Bank Div., Utica Div., and Pioneer Central Div. Emmet G. Cameron and Merle R. Printed Circuit Zinser have become Vice President for production and Financial Vice Presi- Boards Printed dent, respectively, at Varian Associates, and Palo Alto, Calif. Accurately Punched Ready for Components. E. G. Cameron M. R. Zinser Martin F. Bennett has been assigned Plus the to the position of Director of Regional Operations for Radio Corp. of America. Additional Service He will supervise operations of RCA's 8 regional offices. of Complete or Stanley Kramer has been appointed Partial Assembly ass't. sales manager of the Semi -Con- ductor Div. of Radio Receptor Co., Inc., to Customers' New York, N. Y. Specifications. Art Brown has become advertising manager of Jensen Mfg. Co., speaker mfr. of Chicago, Ill. Fred Okon has been promoted- to ad- vertising mgr. of CBS -Columbia Div. of Columbia Broadcasting System, and will report to Gerald Light, CBS -Columbia advertising and sales promotion Direc- tor. FOR THE BEST IN PRINTED CIRCUITS Will James former director of plant operations at this division, has been ... FACILITIES AND SERVICE, IT'S named Director of Operations and will P. S. Don't forget Eby be responsible for all purchasing and Printed Circuit Sockets. mfg. James L. Brown has been named regional manager of midwest sales for CBS-Hytron Div. of Columbia Broad- casting System. His headquarters will be in the Chicago office of the firm. Albert A. Pulley, manager of general HUGH H. CO. recording at RCA Victor Records Div., has been elected president of the Audio Engineering Society, succeeding Jerry B. Minter, pres. of Components Corp., Denville, N.J. 4704 Stenton Ave., Philadelphia 44, PL (Continued on page 62) For product information, 56 use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 NOW...VR TUBES WITHOUT "PIPS"! ...for Stable Voltage Reference U SN -O A2W A, USN - 082 WA NEW "RELIABLE"...DUAL-PURPOSE CBS-HYTRON USN-0A2WA USN-0B2WA* CBS-Hytron, the leader in VR tubes, has solved the "un- J AN- OA 2 JAN -O 82 solvable" VR -tube problem. Has taken those annoying "pips" (sudden discrete voltage shifts) out of two new CBS- Hy_ron VR developments: The dual-purpose USN-OA2WA and USN-OB2WA. Both are superior, "reliable" voltage reg- ulators. Both also achieve stable voltage -reference perform- ance. Ty pica IRegu Iati on Curves These new tubes are directly interchangeable with the JAN- 0A2 and JAN -0B2. But they are manufactured and tested to new, more rigid U. S. N. Bureau of Ships specifications. USN-OA2WA and USN-OB2WA are designed for dependa- bility under severe environmental conditions ... and for a wide range of applications. Improved construction and tight quality control offer many advantages. Check features, curves, and construction of these versatile tubes. RELATIVE LIFE PERFORMANCE !USNt CBS-HYTRON VR TUBES * 0A2le "RELIABLE" USN-OA2WA USN-OB2WA Improved tubes, tested STANDARD----JAN-0A2 JAN -0B2 to U. S. N. specifica- tions, not to be con- fused with earlier "reliable" ver- IONIZATION VOLTAGE JAN sions. TUBE DROP CHECK TUBE DRO P RANGE THESE FEATURES 1. Flat, smooth voltage -current characteristic. 2. Greatly improved voltage repeatability. OPERATING ME 3. Stable electrical characteristics. 4. Tested under severe cDnditions of shock, vibration, and altitude. IMPROVED CONSTRUCTION temperature, 2 USN-OB2WA Note these improvements: I. New, simplified aluminum- rod anode. 2. New disc -type starting electrode, to minimize gap -spacing variations and give mare uniform starting volt- age. (In USN-0A2WA, this elec- trode is located at bottom of mount assembly.) 3. New gas fill with neon body and low argon FREE DATA for both USN-OA2WA and content. 4. New composite USN-0B2 WA. Write for Bulletin E-235. nickel -aluminum cathode work surface. Improvements 3 and 4 make possible operation at -. 150°C ... and stable voltage - CBS reference applications. Y CBS-HYTRON Main Office: Danvers, Mass. A Division of Columbia Broadcasting System, Inc. A member of the CBS family: CBS Radio CBS Television . Columbia Records CBS Laboratories CBS -Columbia CBS International and CBSHytron TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Fer prnducr information, use inquiry card on last page. 57 FASTEST THING IN FASTENINGS ELECTRIC SWITCHBOARDS ELECTRIC RANGES and OTHER APPLIANCES ELECTRIC AND ELECTRONIC EQUIPMENT OVENS ALL TYPES PUSH -ON SPEED NUTS SPEED NUTS "flash" 75% cost savings on pilot -light attachment Start by hand Tinnerman Push-On type SPEED NUTS are strongly For a wide range of stud shapes and recommended for fastening Omni -Glow Pilot sizes these one-piece. self-locking Lights over several alternate methods by Indus- spring steel fasteners zip over plain die cast or plastic studs, trial Devices, Inc., Edgewater, New Jersey. In rivets. tubing. nails, etc. Bite into fact, they are furnished hardest. smoothest surfaces-lock as standard mounting equipment with every firmly under live spring tension order. The reason: production and cost records prove Push -On type on metal. plastic or wood. SPEED NUTS save up to 75 per cent over other fastening methods. Tinnerman Push-Ons provide lightning -fast, vibration -proof attach- ments on thick or thin panel installations and they prevent turning Write today for your copy of "SPEED and slipping. Costly tooling, mounting brackets, tapped holes, NUT SAVINGS STORIES", testimonials of outstanding savings to industry. washers, welded or complicated threaded fastening devices are all TINNERMAN PRODUCTS, INC., Depart- eliminated. The results are lower material costs, faster assembly, ment 12. Box 6688. Cleveland 1. Ohio. less parts handling. In Canada: Dominion Fasteners Ltd., Hamilton, Ontario. In Great Britain: Sim- See your Tinnerman representative for more cost -saving information monds Aerocessories, Ltd., Treforest Wales. In France: Aerocessoires Simmonds. S. A. on these and other SPEED NUT brand fasteners. -7 rue Henri Barbusse. Levallois (Seine). 58 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 CONFIDENCE You can place your orders for printed circuitry and allied elec- tronic sub -assemblies in the hands of Photocircuits Corporation with assurance of satisfaction for these reasons: SUCCESS. Photocircuits Corporation SPECIALIZATION. At Photocircuits has produced more printed circuits of Corporation "printed circuitry" is the the etched foil variety than any other sole aim, and product. Engineering and company. It has an unexcelled reputa- production staffs concentrate only on tion for reliability of quality and pro- producing the best for each application duction performance. Photocircuits Cor- of electronic and electrical circuitry ... poration h is played the largest part in extending to switches, bringing to maturity the young printed commutator circuit industry. discs etc. TECHNICAL AUTHORITY. Coupled RESEARCH, a never-ending activity at with actual production, the Photocircuits Photocircuits Corporation, does not stop Corporation technical staffs have devel- with experimentation on production oped for the trade press authoritative methods! Many suppliers, as well as its information to aid the entire industry. customers, have benefited greatly by Photocircuits' research efforts. This is also the product of pioneering, of Photocircuits Corporation's initiative has concentration, of successful achievement. been the bulwark and bellwether of the Engineering bulletins, furthermore, have industry's development of a variety of been produced on all phases of design insulator -conductor laminates for and production of printed circuitry. printed circuitry. These are available to all on request. The information indicated in the eg ogt7CUtue coupon is yours on request. CORPOR A TION PHOTOCIRCUITS CORPORATION Pioneers in Cost -Cutting Printed Circuit Techniques Dept.T712, 6LEN COVE, N. Y. GLen Cove 4-4000 FLushing 3-5050 l'lia,c send us the literature items checked: 1954 Engineering Brochure P -I Fabrication P-2 Base Materials P-3 Platings & Plated-Thru Holes P-4 Etched or Plated Conductor Characteristics P-5 Printed Components P-6 Switch Plates & Commutator Discs P-7 Assembly & Dip Soldering P-8 Layout & Design BOSTON: 25 Huntington Ave. Commonwealth 6.7705 NAME CHICAGO: 4258 W. Irving Park Rd. PAlisades 5-1170 COMPANY PHILADELPHIA: 1531 Spruce St. Kingsley 5-1205 ADDRESS ROCHESTER, N. Y.: 3 Juniper St. CUlver 7635 CITY ZONE STATE LOS ANGELES: 7407 Melrose Ave. WEbster 3-7276 i DAYTON, 0.: 1521 Burroughs Drive RAndolph 5907 Trade Moro KANSAS CITY, MO.: 903 McGee St. Victor 8090 J TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 59 t=3 FM1 She keeps Case Hi tory Records of every Stackpole iron core ever made! Producing iron cores that are really Guesswork goes out the window. uniform, or matching a new batch of These files backed by over a quarter cores to the exact specifications of a of a century's experience in molding previous run are critical jobs! top quality components from metal powders mean that each and every That's why the files from which the Stackpole core is exactly as you want above sketch was made are basic in it ... electrically as well as mechani- assuring Stackpole iron core superi- .cally. And each one made to a given ority in these all-important respects. specification is exactly like the others. For here are kept careful formula rec- Electronic Components Division ords and production case histories of STACKPOLE CARBON COMPANY, every Stackpole iron core ever made. St. Marys, Pa. 60 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 BLAW-KNOX tower designed and fabricated n . to accommodate special automatic two -man elevator When WWJ-TV, Detroit, wanted an automatic elevator in their new tower, Blaw-Knox went to work on the design of the tower ... in close coopera- tion with the manufacturers of both the elevator and the control system. The result is this tremendous triangular tower . . 14 feet on each side, 1063 feet high and weighing 265 tons ... with special structural features to rigidly support both the 102 foot antenna and the automatic elevator. Ready accessibility to any part of the tower up to the 980 foot level is provided by special design, completely enclosed automatic elevator. It can be stopped by the operator at any level by means of low frequency inductive carrier control. In addition an auxiliary pushbutton station, located at the lower landing, permits manual control at that point. The two controls are interlocked so that only one can be operated at a time. A telephone provides ground-to-car communication. The advanced design and fabrication of this tower for WWJ-TV typifies the kind of service which Blaw-Knox offers you ... to meet your specific requirements. For more complete information on all types of Blaw-Knox Antenna Towers, write or phone for your copy of Bulletin No. 2417. Or send us your inquiry for prompt service, specifying height of tower and type of antenna. BLAW-KNOX COMPANY BLAW-KNOX EQUIPMENT DIVISION TOWER DEPARTMENT PITTSBURGH 38, PENNSYLVANIA lerator-Marshall Elevator Company, Pittsburgh, Pa. :rostrol system-Union Switch & Signal Division of .Vestinghouse Air Brake Company, Wilmerding, Pa. ANTENNA TOWERS Guyed and self-supporting - for AM FM -V microwave communications radar (Continued from page 56) P. F. Brophy has been elected to the office of President of R. W. Cramer Co., Inc., Centerbrook, Conn. He succeeds Mr. R. W. Cramer, founder and first KEARFOTT president of the company, who has be- come Chairman of the Operating Com- ANNOUNCES mittee. a new product line from the West CUSTOM AND STANDARD MICROWAVE EQUIPMENT STANDARD microwave equipment by Kearfott for laboratory or P. F. Brophy A. S. Clarke production includes attenuators, directiónal couplers, crystal - Board mixers, wavemeters and all universally -used microwave compo- of Directors of Nat'l. Electrical Machine Shops, Inc., have elected Mr. nents. Units have been developed for the S, C, XI., X, and K. A. S. Clarke president of the Silver microwave bands. Components to applicable AN specifications Spring, Md., firm. He was formerly are available in brass or aluminum-other materials to order. vice-president in charge of engineering. Walter E. Sutter has been appointed CUSTOMDESIGNEDmicrowave equipment is a specialty of Kearfott. mgr. of sales for instruments and in- Manufacturing facilities, engineering -design personnel, a com- dustrial electronic products of Com- plete test laboratory and wide experience can be brought to bear mercial Equipment Dept. of General on your problem. Kearfott can supply specialized components Electric, and Wayne E. Wright has be- such as rotary joints, RF sources, come sales engineer handling the Com- matched assemblies and test ponent department's ferrite products equipment such as: at G. E. in Syracuse, N. Y. Gen. Walter Bedell Smith, former X -BAND TEST SET MODEL W-109 Under Secretary of State, has been A four -in one instrument that saves time elected Vice -Chairman of the Board of Directors & and money. Precision Wavemeter, Signal of American Machine Foundry Co. Generator, Spectrum Analyzer and Power Monitor in a single instrument for rapid field or assembly line testing. Designed by Kearfott engineers, utilizing Kearfott spe- cialized microwave components. Write for brochures D X Band Test Set. Microwave Components. eaifDttCOMPANY, INC. LITTLE FALLS, NEW JERSEY WESTERN MANUFACTURING DIVISION W. B. Smith M. B. Carlton 14844 OXNARD ST. VAN NUYS, CALIF. A SUBSIDIARY OF GENERAL PRECISION EQUIPMENT CORPORATION M. Barry Carlton has joined Magna- EASTERN OFFICE: vox Co., Fort Wayne, Ind., as general 1378 Main Ave. Clifton, N.J. mgr. of the defense products division. OFFICE! MIDWEST OFFICE: For the past 6 years Mr. Carlton has 188 W. Randolph St. Chicago, III. served as executive director and co- SOUTH CENTRAL OFFICE: ordinator of reliability in the office of 6115 Denton Drive Dallas, Texas the Secretary of Defense. WESTERN AREA OFFICE: 253 Vinedo Ave. Pasadena, Calif. Eugene E. Broker has become man- ager of the Sylvania radio tube plant at Shawnee, Okla. He succeeds Charles W. Hosterman who was named to the new post of ass't general mgr. of the Elec- tronics Div. (Continued on page 164) For product information, use 62 inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Compact Philco Industrial TV camera also available with remote pan, tilt and lens focusing. A SUPERVISORY TV SYSTEM FOR INDUSTRIAL APPLICATIONS L NOTE THESE FEATURES: Professional, high -definition monitor y. L C I Operation at extremely low light levels l_ - I Complete remote control of camera Philco professional TV monitor Here is an amazing industrial TV system by The new camera - one of the smallest yet PHILco -a new management tool which now developed - performs in dimly lighted areas, makes supervision by TV practical and eco- operates unattended for long periods of time .. . nomical for the factory and office. can be completely controlled from a remote location! A high -definition monitor displays distant objects Get complete data on this new industrial TV and people with brilliance and clarity - with a equipment .. . let PHILCO help you plan your "presence" ... as though you were on the scene. system. Write today to PHILco, Dept. T.T HILCO CORPORATION OVERNMEN NOND PHI DELPHIA 44 INDUSTRIAI DIVISION PENNSYLVANIA In Canada: Philco Corporation of Canada limited, Don Mills, Ontario Voltage Regulation BOOKS Modern Physics for the Engineer Edited by Louis N. Ridenour Published 1954 by McGraw-HIll Book Co., Inc. 330 West 42 Street, New York City. 499 pages Price $7.50 IS A VICTOREEN SPECIALTY This volume comprises a collection of lectures delivered to an extension Whenever electronic designs course at the University of California. involve a voltage regulating Dr. Ridenour, who edited this volume, problem, call upon Victoreen has collected the lectures under three regu- main categories. Part One, The Laws of for the proper voltage Nature, covers physics in its narrow lator to give maximum per- definition-what we know of matter, of formance and long life. radiation and the laws of their inter- Here are a few of the Victor- action. The second part, Man's Physical een voltage regulators which Environment, discusses the application quality of physical laws and techniques of in- can be manufactured in vestigation to the study of the universe, quantities at economical costs. Victoreen Very of the earth and of the air. The third High Voltage section deals with the application of Regulators are physics to that branch of engineering sturdily de- known as modern electronics. Some in- signed for regu- teresting chapter headings include: As- lation of poten- trophysics; High Pressure Phenomena tials of 18,000, and Geophysics; Thunderstorms and 20,000, 30,000 Lightning Strokes; Transient Phe- volts. nomena in Supersonic Flow; Semicon- ductor Electronics; Communication Theory and Computing Machines. BOOKS RECEIVED Victoreen subminiature volt- Report on Available age regulators are only %" 13/8" Environmental Test Facilities for diameter x long plus Equipment leads. Available in ratings Testing Electronic for regulating potentials of Prepared for the Reliability Committee of the Radio . Electronics- Television Manufacturers 400 to 2500 volts. Association, 81/ x 11, soft cover, 140 pages (appr.) Price $10.00 Contains company names, addresses, persons to contact for or- ganisations in U.S. having radio noise, shock, vibration, and environmental chambers for testing electronic equipment to meet military specifications. Equipment available at each laboratory listed on separate sheets. Available from RETMA Engineering Office, Room 1015 500 Fifth Avenue, New York 36, N.Y. Symposium on Temperature Stability of Electrical Insulating Materials A compilation of the eleven papers presented at th 57th Annual meeting of the American So. This Victoreen glass enveloped regu- ciety for Testing Materials in Chicago, June lator can be produced in quantities 1954. Titles include: Electrical Properties of Thermosetting Plastics at Elevated Tempera- of uniform high quality for applica- tures; Electrical Resistivity of Bonded Mica- tions requiring potential regulation ceous Materials at Elevated Temperature; from 500 to 5000 volts. Heat Aging Characteristics of Insulating Var- nishes; Effect of Elevated Temperature on Silicon Varnished Class Fabric for Electrical Insulation. This 141 -page heavy paper cov- ered volume available from American Society for Testing Materials, 1916 Race St., Phila. 3, Pa. at $2.75 per copy. Rod, Bar and Wire Product Information A 160 page, hard covered volume, 5% s 8%, The VXR regula- dealing with the production of aluminum and 6000 series its specific properties and characteristics as tor is typical of Victoreen related to rod, bar and wire as well as new metal case designs for po- data regarding various alloys, their applica. tential regulation Lions, fabrication and finishing methods. Glos- from 6000 sary of descriptive words and definitions in. to 15,000 volts. eluded as well as numerous engineering tables and nomographs. Available on request on company letterhead or at cost of $2.00 from Technical Editor, Kaiser Aluminum and Our engineering department is available to Chemical Sales Inc., 22 N. LaSalle St., Chi. help solve your voltage regulation probelms. cago 1, Ill. United States Dept. of Commerce Publications Available through local field offices or from Office of Technical Services, U.S. Dept. of COMPONENTS DIVISION: 3814 Perkins Ave. Cleveland 14, O. (Continued on page 68) 64 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Miniaturization with Hughes Diodes New computer matrix has high component density This experimental Frequently, space requirements of diodes, designers can take full ad- reading gate matrix for conventional wiring techniques vantage of advanced packaging airborne computers effectively will not permit electronic equip- and wiring techniques. utilizes the subminiature size of ment to be miniaturized to the Hughes diodes are easy to mount Hughes Point -Contact Germanium same extent as the components. in conventional assemblies or in Diodes*. Developed by the However, spot-welded connec- subminiature equipment. In service, Miniaturization Group of Hughes tions can effectively reduce wiring these diodes have earned a reputa- Research and Development Labo- space ... and it is easy to spot- tion for reliable performance and ratories, the unit measures 5/ by weld the dumet leads of Hughes stability under severe operating 12 3/ by inches (excluding plugs diodes. There is no adverse effect conditions. Make your selection J and frame). It contains 504 diodes, on diode characteristics, even when from the many standard and special *Actual size, diode 209 resistors. Average component the connections are welded close types available - all listed and de- body: 0.265 by 0.130 density: 94.5 per cubic inch! to the diode body. With Hughes scribed in our new Bulletin, SP -2A. inches, maximum. Reprints of a paper describing the SEMICONDUCTOR SALES DEPARTMENT packaging techniques of the sub- Hughes miniature matrix are available, too. Your copy will be sent promptly on request. Aircraft Company, Culver City, Calif. o New York Chicago TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 65 2 New SYLVANIA SOCKETS save Assembly Time ...Cut Costs ...Improve Performance! Tube Shield Ground Strap New Sylvania 7 -pin Miniature Printed-circuit Sockets. Con- tacts and center shield are shaped so that sockets can be stacked one upon another for automatic feeding and assembly. Small slots are used on the circuit board to receive the contacts, resulting in stronger chassis construction. Only one socket assembly need be stocked since terminals can be interconnected by printing New Sylvania Solderless-type Sockets the circuit on the chassis board rather than using a metallic con- 2 for wire -wrapped connections are now nector on the socket itself. being made in all 7 and 9 -pin miniature sizes. Insulator is molded of general-purpose or low -loss phenolic. Con- Contacts are shaped to provide reliable con- tacts are brass or phosphor bronze, plated to suit your specification. nections with the use of present wire -wrap- Supplied with or without center shield. Now available in 7 -pin ping tools. construction with 9 -pin miniature and other types to follow. Tube Shield Ground Strap can also be furnished. For full information concerning these or other Sylvania parts, or special quality components engineered to your See the full story of Sylvania's Fabri- own specifications, write to Dept. 4A- cating Services in Sweet's Catalog - 4412, Sylvania today. Product Design File. Look for 1 b Sy -° SYLVANInc., 1740 Sylvania Electric Products Broadway, New York 19, N. Y. In Canada: Sylvania Electric (Canada) Ltd., University Tower Building, St. Catherine Street, Montreal, P. Q. LIGHTING RADIO ELECTRONICS TELEVISION 66 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 UNG-SO1 AMPLIFIER HIGH POWER CAPABILITIES (Up tc 100 watts output in pairs) LOW DISTORTION OUTPUT EXTREMELY UNIFORM CHARACTERISTICS LONG LIFE MECHANICAL DATA Coated Unipotential Cathode first in its power Outline Drawing Bulb-Short St -16 Base Large Wafer Octal 8 -Pin Mica! with Metal Sleeve B8-86 Vr16" range .. designed Maximum Diameter 2 Maximum Overall Length 43/4" specifically for Maximum Seated Height 43/16" Pin Connections Retma Basing 75 audio service Pin 1-Base Shell Pin 5-Grid No. 1 Pin 2-Heater Pin 7-Heater The Tung -Sol 6550 is a brand new and direct approach to the Pin 3-Plate Pi n 8-Cathode and high power design requirements of high fidelity audio amplifiers. Pin 4-Grid No. 2 Grid No. 3 For outputs up to 100 watts, two 6550's in push-pull will provide Mounting Position Any the same power now attained in most existing designs by the use of four or more tubes. In addition to greater aud';o output, ELECTRICAL DATA use of the new 6550 results in simplified electrical balance, re- (INTERPRETED ACCORDING TO RETMA DESIGN CENTER duced maintenance and lower cost. The Tung -Sol 6550 is not SYSTEM) directly interchangeable with the 6L6, 5881 or KT66 class of DIRECT INTERELECTRODE CAPACITANCES No Shield tubes. With proper circuitry, however, the 6550 will provide - full power output with approximately the same grid voltage Grid #1 to Plate 0.85 µµf drive as the smaller tubes. The 6550 is produced under labora- Input 14.0 µµf tory conditions with exhaustive quality control to assure premium Output 12.0 µµf performance and long life. RATINGS Heater Voltage (AC or DC) 6.3 ±10% VOLTS Rugged Construction - The advanced design features which Maximum DC Plate Voltage 600 VOLTS have made the Tung -Sol 5881 so extremely reliable are em- bodied in the 6550. Maximum Plate Voltage (Triode Connection) 450 VOLTS Maximum Plate Dissipation (Triode Connection) 40 WATTS Glass button stem construction is strong and compact and Maximum DC Grid #2 Voltage 400 VOLTS provides a rugged support for the tube structure. Maximum Grid #1 Voltage -300 to 0 VOLTS Micanol wafer and metal shell base provides furl lifetime 2 Maximum Plate Dissipation 35 WATTS electrical insulation and greater mechanical strength. Maximum Grid #2 Dissipation 6.0 WATTS Cathode materials of exceptional stability give more uni- 3 Maximum DC Cathode Current 175 MA. form emission with greater life expectancy. Cathode is not Maximum Heater -Cathode Voltage poisoned by inactivity during standby periods. Heater Positive (Peak) (DC not to exceed 100V) -1-200 VOLTS 4 Maximum control of grid emission achieved by gold plating Heater Negative (Peak or DC) -300 VOLTS and carbonizing. Maximum Grid #1 Circuit Resistance (Fixed Bias) 50 KILOHMS Triple gettering 5 promotes long, gas -free life. Getters ore Maximum Grid #1 Circuit Resistance (Self Bias) 250 KILOHMS confined by a spray shield to prevent mica contamination. Maximum Bulb Temperature 250 °C Life tests are made under severe overload conditions to 6 assure adequate safety factor. HEATER CHARACTERISTICS Heater Voltage 6.3 VOLTS Heater Current 1.8 AMP. f The TUNG-SOL engineering which nos produced the 6550 is constantly at tt work multitude ltro tubel op m loi M o \ r4 exceptionally escientofgeneral aendec sptnaol purpose rubesentshave resulted.industry. Tecnt'-h - meal data sheets. or circuitry suggestions fior the 6550 r ay be obtained b writing to Tung -Sol Commercial Engineering Deportment. TUNG-SOL NG -SOL ELECTRIC INC., Newark 4, New Jersey - Sales Offices: Atlanta Chicago, Columbus, Culver City (Los Angeles), Dallas. Denver, Detroit, Newark Seattle TUNG-SOL makes All -Gloss Sealed Beam Lamps, Miniature lamps, Signal Flashers, Picture ELECTRON TUBES Mes. Rodio and Special Purpose Electron Tubes and Semiconductor Products TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 67 newest aids to BOOKS (Continued from page 64) AUTOMATION! Commerce, Washington 25, D.C. Checks pay- able to Treasurer of the United States. Metal Coatings on Non -Metallic Materials. A nine volume guide to the techniques of de- positing metal coatings which includes: PB 111326, Vol. 1, Silver Films, 138 pp., $2.00; PB 111327, Vol. 2, Copper Films, 37 pp., $1.00; PB 111330, Vol. 3, Nickel Films, 14 pp., $1.00; PB 111331, Vol. 4, Lead Sul- phide Films, 19 pp., $1.00; PB 111332, Vol. 5, Gold Films 17 pp., $1.00; PR 111333, Vol. 6, Mechanical Films, 21 pp., $1.00; PB 111334, Vol. 7, Metallic Paints for Printed Circuits and Other Uses, 30 pp., $1.00; PB 111335, Vol. 8, Vacuum Coating Methods, 22 pp., 81.00; PB 111336, Vol. 9, Applica- tions of Metal Films on Commercial Products, 29 pp., $1.00. Some Ultrasonic and Sterilasation Research. Significant advances in fields of ultrasonic energy, sound propagation and electronic and radiological sterilization. PB 111190, 27 pp., $0.50. Materials Suitable for Sound Applications: Ultrasonic Velocities and Impedance of Se- lected Liquids PB 111234, 44 pp., $1.25. Transistor Circuits Components. Survey of mini- ature electronic components alreay available and under development. PB 114778. Photo- copy $4.00, Micro film 82.25. 22 pages. Progress Report on Reliability of Electronic Equipment. PB 111455 20 pages, $0.50. Here are three unusual "helping hands" which will The Automatic Office enable you to reduce many of your present production By Messrs. Alden, Cleminshaw, Dinsmore, McClay, Pearsall, Williams and Windsor 48 and control operations to push-button simplicity. Be- Clippard MINIATURE PNEUMATIC pages, 81/2 x 11. A study of the applications CYLINDERS (No. MAC 38), are of electronic digital computer principles to cause of their versatility, they will fire your imagina- shown above in a typical test jig the automatisation of clerical and accounting set-up activating electrical con- tion-suggest challenging new ways to manufacture routines. Price $5.00. Available from William tacts. Size of cylinders overall is L. Alden. Alden Sv.tems Co., Alden Research 2t/it" x r/it" dia., stroke 3/e" maxi- Center, Westboro,Mass. better products faster, at lower cost. mum, spring return piston.Op- erates on as little as 12 pounds Clippard Miniature Pneumatic Cylinders, for air pressure. Eastern Joint Computer example, are so small they can be jig mounted Conference and Exhibition on %" centers, making them ideal for activating Eastern Joint Computer Confer- electrical contacts, valves or small work holding ence and Exhibition will be held at or feeding fixtures. In test operations (see jig illus- the Bellevue -Stratford Hotel, Phila- tration at right) they actually give an operator extra delphia, Dec. 8, 9 and 10, 1954, and hands to work with thru use of a foot pedal air valve. the following papers will be pre- sented: If your manufacturing process involves the test- WEDNESDAY, DECEMBER 8 grading matching resistors, ing, sorting, or of the "Small Computers in a Large World," C. W. Clippard P. R. 5 Automatic Resistance Comparator Adams, Digital Computer Lab., M.I.T. P. R. 5 AUTOMATIC RESISTANCE "Characteristics of Currently Available Small will pay for itself very quickly, permitting you to COMPARATOR permits unskilled Digital Computers," Alan J. Perlis, Com- operator or automatic set-up to puting Lab., Purdue Univ. compare unknown resistors with a standard resistor test, grade, sort or match as "Why Not Try a Plugboard," Rex Rice, Jr., many resistors a minute as can Northrop Aircraft, Inc. simply by touching them across two terminals. Work be touched across two front "Techniques for Increasing Storage Density of Magnetic Drum Systems," Harrison W. can be handled either by unskilled operator or auto. terminals. Range 100 ohms to 100 megohms. Three scales of Fuller, Paul A. Husman, Robert C. Kehler, matic production set-up. deviation from your standard: Lab. for Electronics Inc. -5% to +5%, -25% to +30% "Application and Performance of Magnetic or -50% to +100%. Core Circuits in Computing Systems," Rob- The Clippard P. C. 4 Automatic Capacitance Com- ert D. Kodis, Raytheon Mfg. Co. "A Self Checking High Speed Printer," Earl parator is a companion instrument permitting you Masterson, Abraham Pressman, Eckert- Mauchly Div., Remington Rand. Inc. to accurately check, grade, sort or match up to "Teletype High Speed Tape Equipment and Systems," William P. Byrnes, Teletype 8000 condensers of any type (10 mmfd to 1000 mfd) Corp. in one day. Either unskilled labor or automatic THURSDAY, DECEMBER 9 set-ups can be used. "Operating Characteristics of the National Cash Register Company's Decimal Com- puter CRC 102-D," R. M. Hayes, A. D. Write for catalogue sheets describing these ver- Hestenes, L. P. Meissner, Electronics Div., National Cash Register Co. satile new "helping hands" to automation, and lit- "A Marchant Minute Computer System," George B. Greene, Marchant Research Inc. erature showing how others are using them to pro- "Performance of the TRADIC Transistor Digital Computer," J. H. Felker, Bell Tele- duce higher quality products at lower cost, today! P. C. 4 AUTOMATIC CAPACITANCE phone Labs. COMPARATOR grades, sorts, "Application of a Burroughs E101 Com- checks or matches all types of puter," Alex Orden, Burroughs Corp. condensers (10 mmfd to 1000 Panel, "Small Digital Computers and Busi- mfd) at production speeds with ness Applications," Chairman William D. laboratory accuracy. Requires Bell. Clippard no accessories other than the Panel, "Redundancy Checking for Small standard capacitor against Digital Computer," Chairman Richard W. which unknowns are to be com- Hamming, Bell Laboratories. INSTRUMENT LABORATORY, INC. pared. Panel, "Small Digital Computers to Assist Large Digital Computers," Chairman, John 7390 Colerain Road, Cincinnati 24, Ohio W. Carr, III, Univ. of Michigan. (Continued on page 162) MANUFACTURERS OF R.F. COILS AND ELECTRONIC EQUIPMENT 68 For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Why it's Good Business to Standardize on BUSS FUSES Manufacturers and service organizations in increas- ing numbers are standardizing on BUSS fuses because ... they know, from their own experience, that BUSS fuses give dependable electrical protection under all service conditions. In fuses, unfailing dependability is so necessary - for the fuse alone protects when there is trouble on the circuit. And just as important, a fuse should never give a "false alarm" by blowing needlessly. To make sure that BUSS fuses maintain their 40 year old reputation for highest quality, every BUSS fuse normally used by the Electronic Industries is tested in a sensitive electronic device that automatically rejects any fuse not correctly calibrated, properly constructed and right in all physical dimensions. Save designing time on new products. When designing new devices that require electrical protection you can save engineering time by turning to BUSS. Our fuse research laboratory and its staff of fuse engineers can help you save time and money in deter- mining the right fuse or fuse mounting for the job .. . and if possible, ones already available in local whole- salers' stocks. Makers of a complete line of fuses for home, farm, commercial elec- tronic and industrial uses. for More Information TRUSTWORTHY NAMES IN Mall this Coupon ELECTRICAL PROTECTION BUSS BUSSMANN Mfg. Co. (Div. McGraw Electric Co.) .1 1 University at Jefferson, St. Louis 7, Mo. Please send me bulletin SFB containing facts on BUSS small dimension fuses and fuse holders 1 I Name Title 1 1 Company.__. 1 1 Address I 1 1 City & Zone._ State.__ rr.i 4 ZS TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use Inquiry card on last pace. 69 Sprague PULSE TRANSFORMERS for digital computers BASIC CHARACTERISTICS OF TYPE 10Z PULSE TRANSFORMERS Pulse .05 to 0.5 microseconds. Duration flipflop circuits buffer circuits amplifier circuits gating cir- Applications pulse cuits other circuits with pulse lengths up to about 0.5 microseconds. Hermetically sealed. Housed in cor- rosion -resistant can with glass-to- metalysical solder -seal terminals at each Type 10Z pulse transformer at left is color -coded to Physical and customer specifications. Unit at right is standard. end. Can length is % diameter is 1/2". Transformers can be mounted and supported by lead wires in most applications. As a new line of reliable components for digital computers, Sprague has introduced Ratio 1:1 - Cat. No. 10Z3 s and is in production on pulse transformers Ratio 2:1 - Cat. No. 10Z5 of a new type. This transformer line is prin- Ratios Ratio 3:1 - Cat. No. 10Z4 cipally directed to high speed, low power Offered Ratio 4:1 - Cat. No. 10Z2 computer circuits, with some designs also Ratio 5:1 - Cat. No. 10Z1 finding application in blocking oscillator Special Ratios Available circuits, memory ring driving circuits, etc. For a pulse length of 0.1 microsec Maximum Two major types are offered: a miniature ond, pulse repetition rates up to 2 Repetition transformer, Type 10Z, for 0.05 to 0.5 megacycles per second can be em Rate microsecond pulse circuits, and a larger ployed. transformer, Type 20Z, for handling pulses up to 20 microseconds in length. Inter- Pulse Normally used in circuits whose puls mediate sizes and plug-in units are also avail- Amplitude amplitude varies up to 60 volts. able for special customer requirements. Maximum working voltage, 300VDC Basic data on the high reliability min- Flash tested between windings a t D -C iature transformer is tabulated at right. 600VDC. May be life tested at 45( Rating Complete details are in Engineering Bul- VDC between windings, 85°C, for 25 0 letin M 502. A copy will be sent you on hours. letterhead request to the Sprague Electric Company, 233 Marshall Street, North May be operated between -55°C ant Adams, Massachusetts. Temperature +85°C. Higher temperature unit s available on request. 20,000 megohms minimum between Insulation Sprague, on request, will provide you windings, measured at 25°C and 18C Resistance with complete application engineering Volts DC. service for optimum results in the use of pulse transformers for computers. WORLD'S LARGEST CAPACITOR MANUFACTURER Export For PRAGUEThe North Adams, Mass. CABLE: SPREXINT Americas: Sprague Electric Internationa Ltd., , T , .¡. ... 70 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 TELE -TEC H E, Electronic Industries Lexington Ave., New York 17, N. Y. O. H. CALDWELL, Editorial Consultant * M. C'_EMENTS, Publisher * 430 It's Later Than You Think! Cold War. We're throwing suçcessful experience. Virtually all Soviet engineering We're losing the Scientific and sometimes even our technological lead over the Soviet Union. schools offer five-year deferments, away service. Scientific occupations We're jeopardizing our future survival. exemptions from military editors are not being panicky or sen- are the highest paid in that country. Believe us, the manpower, we propose sationalist in stating the case in such strong terms. There To increase our engineering statements, and we the following, and suggest that key engineers and ex- is ample evidence to justify such their influence these supporting facts as soon as they ecutives in the electronic industries use have published and government officials to have become available. (See editorial, "Stop Wasting to encourage management & Electronic Indus- promote such efforts. Engineers," Sept. 1954 Tele -Tech and high items in this year's May, July, 1. Intensive educational program to grade tries. Also, "Radarscope" parents to acquaint them with Aug., Oct. and Nov. issues.) school students and their of other men in the the career opportunities in engineering. Despite these efforts, and those teachers. profession who appreciate the urgency of 2. Increased pay for high school science engineering policy for college engineer- the situation, little information has been disseminated 3. Liberal draft deferment exception is a recent front-page ing students. to the public. A notable -supported scholarships to in the New York Times, from which the follow- 4. More generous industry report students. ing is taken. promising science data of federal grants to technical The Soviet Union has 175 technical schools at univer- 5. Expanded program level with a student body of more than 300,000. The students. sity government tax benefits to companies aid- U.S. has about 150,000 engineering students. 6. Special has 3700 intermediate technical training ing future engineers. The Soviet encouragement to young women schools with 1,600,000 students. We have about 1000 such 7. Special educational to enter the engineering field. schools with an enrollment under 50,000. to students in higher edu- 8. Maximum training and utilization of technicians China has 150,000 technical work. is graduating 25,000 persons a release engineers for more advanced cational institutions, and and technicians. year from two-year engineering courses. 9. Higher pay for engineers of scientists in regard to po- The threat to the U.S. high school science program- 10. Better consideration training ground for future graduate engineers-is omi- litical and security matters. for such teaching has We can not stress too strongly the importance of ini- nous. College graduates trained our engineering man- in the last four years, from 9096 to 3978. tiating a bold program to increase fallen 56% because it's later than you think. In Soviet secondary schools, 40% of the curriculum power. The time is now, is devoted to science and mathematics. Soviet professional engineering training is of high Thousands of Graduates ,140 quality, and practically comparable to our masters' 140 I I I degree. GRADUATES PER YEAR IN ALL SCIENTIFIC FIELDS.. / AND SOVIET UNION '" 120 The Soviet produced as many Ph.D.'s last year as the 130_ UNITED STATES / / U.S., but while our degrees were three -to -one in favor I 100 of the humanities, they had the same ratio in favor of 100 UNITED STATES ei science and engineering. W The U.S. has approximately 500,000 engineers and 80 .. /--- 200,000 other scientists. Russia has 400,000 engineers and 60 in the ac- 60 - 150,000 other scientists. However, as shown E I with their tremen- 40 companying chart from the Times, 40 I SOVIET UNION dous rate of training, they will easily outstrip us in a 20 few years. 20 I I t t I I t 1 1 1 t 0 p 1 I t t t 19551 1956 How to Meet the Crisis 1940 1945 1950 1 1930 1 1 1 1935 In addition to encouraging young people in grade schools to enter engineering careers, the Soviet offer Graph comparing scientific graduates in USSR and USA from other important inducements. We can profit by their 1930 to 1956. (From New York Times, November 6, 1954) 71 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 HIGH FREQUENCY' 3 (HF) 98 'VERY HIGH FREQUENCY' (VHF) YONUS^+^'A., w rURLISAFETY r ' s - mum RADARSCOPE L. O `M.uö, N.l ;¡ FM TV ó ó î .m"'OOMRNMENT UC CHANNELS 'Wá Revealing p ä e . ÿ O < important developments and trends Y n AMATEUR INTERNATIONAL RC t 0 : °"2O.^L -s > é e R 9 1011771f: throughout the spectrum for radio, TV and o C 1 MAANALTM ° X IÓ n electronic research, manufacturing and operation MEDICS' = SCIENTIFIC S I.6 1 54 77'6 U 1g8 1 1411i 7 1 4 7 1'5 0 1 1 7I RESTLESSNESS and change mark the continued dyna- types, including 10% higher dc voltage for a given input mic growth of the electronic industries as the end of and immunity to ageing. Serious drawback for the orig- 1954 nears. Eyes are focused on future course of industry inal equipment market is higher cost of germanium patent pool. Number of medium -size defense plants are rectifiers. Possibly this obstacle may be temporary and looking around for suitable commercial products. A not affect the replacement market. In high -current large transmitter manufacturer is quietly up for sale. magnetic amplifier applications, (above 1 ampere) Status of fair trade laws is under anxious observation. where rectifier forward voltage drop is an important Several non -electronic industrial giants are scrutinizing consideration affecting gain and efficiency, the claim is the field for a suitable point of entry. Shifts in adver- made that for a 130 v. rms germanium rectifier the drop tising agencies are in progress. Mixture of caution and would be less than 0.5 v.; for silicon about 1.5 v.; for optimism accompany anticipation of rapid rise of color selenium over 5 v.; and for gas tubes over 10 v. TV. All the searching and jockeying for po;ition point to a year of stiff competition, significant expansion and NUCLEAR magnetic resonance spectroscopy, developed aggressive selling. at the end of World War II, is finding increasing accept- ance in the laboratory. In contrast with conventional GERMANIUM POWER RECTIFIERS are being pushed spectroscopy, which relies on radiation emission or for the TV receiver market. General Electric reports absorption, the new technique depends upon nuclear that such units have several advantages over selenium energy absorption when under the influence of station- ary and modulated magnetic fields. It can recognize very fine differences between nuclear particles in a given SUBMARINE COUNTERMEASURE specimen. RADIO TARGETS MODERN MILITARY AIR WEAPONS, such as guided missiles, radar controlled anti-aircraft guns and jet in- terceptor planes require modern targets for crew train- ing. Inadequateness of targets previously used such as 200 mph towed sleeve targets, small radio controlled planes with gasoline engines, and obsolete planes con- verted to drone operation have been emphasized by recent gunnery tests. Small, swept-wing, pilotless jet planes, such as the Ryan "Firebee" are now being delivered to the Air Force, Army and Navy. These are able to fly about 600 mph at altitudes up to 40,000 ft. and are piloted from an electronic remote control on the ground. Since the cost of these units are approximately one -tenth of a converted piloted aircraft to a pilotless radio -controlled drone, and in view of our nation's constantly expanding air horizons, a new electronic industry is in the making. RECORDING MEASURING ENERGY and frequency of ocean waves is a topic receiving considerable attention of late from outstanding scientists and organizations. Recently Drs. S. S. Chang and W. J. Pierson Jr., N.Y.U. Research Stinger tail on U.S. Navy Neptune P2V-7 contains new electronic device Scientists, reported a new electronic instrument for re- capable of locating submarines hiding submerged beneath the sea. The cording ocean waves on magnetic tape. A three -unit Lockheed aircraft, called the "MAD-bird"-MAD standing for magnetic air- device consisting of recorder, playback unit and borne detector-spots the subs by registering disturbances in the earth's ana- magnetic field, and then lets loose with depth charges or torpedoes. lyzer, it does in five or ten minutes the laborious and 72 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 'VI TRA HIGH FREQUENCY' (UHF) 3,000 SUrtR r49GR FREOUFNCY Fsraf 3M - <á GOVERNMENT I l GOVERNMENT ..2, J Ea Z E F .. w W $ Z Z AMATEUR, 1e40 9R0 ) Fi` iîá e Ow a TVH x MOBILE, 0 Z.7 âc W INDUSTRIAL, d' ',py 70 CHANNELS áOáZ o á C,pol W GOVERNMENT, á Ó áz ä>á . W 00 »Z F 1Qjj Ó AEuO-NAVIGATION, p á 0 Qp F RADAR ,> Z u 14151iI7.H 1 818783> ÓW Q ZG á Z< .Er, z 2 N -MICROWAVES- 35.6 890 960 1215 1300 71R MEGACYCLES 0 4fi 460 470 1990 5 7125 335.1 4 106 410 1 error -susceptible mathematic computations previously example of the second step is the integration of radar requiring two weeks by hand. The instrument is not a and computer controls in automatic yard controls, de- computer, however, and costs only a fraction thereof. A veloped jointly by the Union Pacific Railroad and pressure transducer FM modulates the on -shore tape Reeves Instrument Corp., a Claude Neon subsidiary. recorder operating at 0.5 in. /min. Playback then repro- The electronic yardmaster virtually eliminates impact duces wave for permanent graphical recording. Increas- damage to boxcar lading resulting from human errors. ing tape speed by about 4000 times permits obtaining a As the freight cars are pushed over the hump to descend wave record spectrum. Fed into a filter analyzer the end down the incline to various tracks of the yard, a range - product is presented as a function frequency for a finding device determines how far the car must roll to 20 minute period and represents graphically the amount couple with other cars. A radar meter measures the of energy at each wave frequency. Wave properties like speed. All this data is fed to a computer which de- surf beats and swell can be determined and thus permit termines exactly how much the car should be slowed, accurate representation of the net effect of the waves on and actuates braking devices on the retarder section of beaches, shore structures and vessels. track, releasing it at just the right speed to roll perhaps mile and reach the coupling point at 3 mph. MICROWAVE COSTS RECENT INDICATIONS by FCC to permit operation of privately owned microwave relay systems for television ULTRASONIC TOOL broadcasters has evoked some supporting comment from smaller stations. Generally it appears that privately owned systems can be operated at ?its to T/io the monthly cost of rental from AT&T, the common carrier. Short one hop systems cost about $16,500 initially and there- after about $450 a month to operate. AT&T charges for monthly services are reported to range from $3500 to $4000. Such high monthly outlays are a burden for the smaller broadcasters, some of whom are already operating in red. There will be more on this topic in the near future. ECONOMY TECHNOLOGICAL EXPANSION is a must if we are to reap the benefits of our past gains and keep our econ- omy strong, notes Dr. W. R. G. Baker. To do this we need a higher level of education, and educational TV is one means which can accomplish it. Outlining how the nation will expand, and provide new markets and opportunities, Dr. Baker noted that the U.S. population is expected to reach 184 million by 1963, a 15% increase over this year. This would mean 5 to 6 million new homes, millions more automobiles, TV sets and radios, and all other items required for modern living. Money spent on goods and services is expected to increase from $356 billion to $530 billion by 1963, and the money avail- able for consumer spending or saving will increase from $252 billion to $365 billion. Impact grinding by ultrasonic machine tool developed by Raytheon Meg. Co. permits intricate shapes to be cut from hard and brittle materials, RADAR AUTOMATION such as glass, ceramics and tungsten carbide, which were difficult or im- possible to machine before. A 25 kc magnetostriction unit drives the brass CATCHING automobile traffic violators is only the first or soft steel head a few thousandths of an inch up and down. Abrasive particles, suspended in a liquid which flows over the work in a continuous step in what is expected to become a definite pattern of stream, are driven by the head, rapidly striking the work with f-rces civilian industrial applications of radar control. A good up to 10,000 times their normal weight. This action does the cutting. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 73 111111111111111111111111 Fig. 2b: Printed wiring side of amplifier showing arrangements of breaks and solder points A Universal Fig. 1: Universal printed circuit board consists of pattern of wiring on one side which may be connected in a large number of combinations Time -saving standard board offers design engineers opportunity to try developmental circuits quickly By J. R. GOODYKOONTZ Aeronautic & Ordnance Systems Div. General Electric Co. Thus very little is saved in reality; Schenectady, N. Y. the time lag and cost are simply projected into the future. SINCE its introduction the printed But these difficulties may be circuit has been considered to be avoided. To do this we have devised suitable only for relatively large what we call the universal printed production runs. This is so because circuit. This circuit, designed to the cost advantage of the printed mate with a printed circuit connec- circuit does not appear until a cer- tor, is shown in Fig. 1. As can be tain critical production quantity is seen the circuit consists simply of a surpassed. A second reason, and this number of parallel wires which are (Ai) ' 1 is more important from the view- fabricated onto one side of an insu- point of the development engi- lating board. To adapt the universal Fig. 2a: Circuit of amplifier shown above neer, is that the printed circuit circuit to a particular circuit it is may not be altered to accommodate merely necessary to cut the board circuit changes. Unfortunately cir- down to the desired size, using that cuit changes are necessary in the section of the circuit which most TABLE I development stage and frequently in closely fits the application, break Company A 23 days Company B 34 days the early production stage also. This certain wires by cutting and peeling " A 57 " A 6 is especially true when a weapon off wire sections and adding cross " A 13 " C 28 such as a torpedo_ or guided missile over wires on the component side " B 31 C 23 is made. These devices cannot be of the board. In making the layout " A 17 C 40 " C 47 C 23 adequately tested in the laboratory. care is taken to keep the number of Frequently the first model of such cross over wires at a minimum. A 19 Average 27 days a device is built with the primary Shown in Fig. 2 is an amplifier purpose of determining what circuit which has been made using the uni- changes will be necessary. versal printed circuit system. all practical purposes, reduces this Obviously if such printed circuits time to zero. In addition, the flexi- Universal I'irrviit are stocked a considerable amount bility of the system permits circuit of time can be saved in putting to- changes to be made with relative For these reasons, and also be- gether the first laboratory samples ease. cause of the time it takes to get a or prototypes of an equipment. An While the process of adding and printed circuit made, the utilization idea of the time saved can be gained subtracting wires on a universal of the printed circuit during devel- from Table I. This table was made printed circuit to adapt it to a par- opment is a burden. Yet it is not a up from the records of all the ticular circuit is ideal for laboratory good idea to use conventional wiring printed circuit orders which the and model shop applications it does for development if printed wiring is writer has made during the past not follow that the same system is contemplated for production. This two years. The table includes only best for production applications. procedure will save some tithe dur- the time between ordering date and Therefore in converting a particular ing the early development stages but delivery date and does not include design to production it woúld be de- makes necessary an eventual, com- drafting time. sirable to fabricate the circuit boards plete redesign of the equipment. The universal printed circuit, for with the subtracted wiring already 74 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 r I outs to fit the various types of cir- cuits which they expect to produce. Foresight, generated by experience, will ultimately enable them to ap- proximate their general require- ments in advance and to provide themselves with adequate standard- ized circuits for their development projects. Time Interval It has long been recognized that the time interval between the con- Fig. 2c: Reverse side of boards in Fig. 2b shows tubes and components connected to wiring ception of an electronic device and its production is too great. In fact for certain types of equipment, mili- tary equipment in particular, the in- terval is such that by the time the first shipment of a device is made the device is obsolete. It is believed Printed Circuit that the process suggested here would in general reduce this time by about a month if no circuit off and with the added, cross over fore simplified, as compared to pres- changes are made. If circuit changes wires printed on the reverse side. ent systems in which component are made the time saved would be Electrical ties may be made through leads are randomly positioned. even greater. the board by means of plated holes No disadvantage of the system is Skeptics of course may view the or eyelets. Thus the production seen other than the obvious one that process with less optimism. But even methods for circuits developed in it may not be convenient to modify the takers of the dim -view will have this system would not be essentially the universal printed circuit to fit all to grant that the process will save different from the conventional applications. In this regard it should some time, time which could well methods now in use. In fact, if pro- be noted that the circuit shown in be used for something else. And this duction is accomplished by auto- Fig. 1 need not be considered a final time is obtained without cost in matic machines, the system is actu- and ultimate form. This layout was quality, without making any new ally superior, since, due to the devised to apply to the problems of a demands of skill or machinery, and restrictions placed upon the com- particular laboratory. Other labora- without giving rise to a loss some- ponent lead positions, the possible tories may find it to their advantage where else in the long and difficult instructions to the machine would to alter this layout or to provide process of converting a thought into likewise be restricted, and there- themselves with a number of lay- a finished, material product. Printed Circuit Soldering Techniques By FRED A. ANDREWS, JR. action of the acid etch. However, it One fairly accepted method for Vulcan Electric Company will just as effectively deter the ox- deterring excessive oxide build-up Danvers, Mass. ide removing duties of the solder on clean panels when extended stor- flux. Unfortunately these inks have age is required has been the dipping PRINTED circuit soldering is no enamel, dried asphalt, or similarly or hot -spraying of panels with para - different in principal than more inert bases which are insoluble in fin or light wax. This of course re- conventional and better practised customary solvents and necessitate vives the necessity for cleaning prior solder operations. Yet several diffi- light mechanical abrasion for thor- to the actual soldering operation. culties are reported and for causes ough cleaning. The decontaminated Residual wax can carbonize at ele- we can look for breaches of the most copper circuit is then, of course, vated soldering temperatures, and fundamental soldering precepts. Vi- subject to normal oxide build-up effectively impair the quality of the olation of the following maxims ap- which must be flux removed prior completed panel. pear to be most prevalent: to dip soldering. Strangely enough, (1) Surfaces to be soldered must however, soldering difficulties can Electroplating be clean and completely free more often be traced to this ink of metal oxides. contamination than to inadequate More prevalent has been the prac- (2) The parts to be soldered must fluxing. It is interesting to note that tise of electroplating printed circuits. be as hot as the molten solder. some manufacturers are dusting and The plated circuit is by no means an Close consideration should be rubbing printed panels in bins filled expedient for corrosion resistance given to the entire removal of the with granulated corn cobs. This not only. A wide assortment of plating conductor pattern which has been only acts to dry the boards subse- metals have been used with consid- printed or screened on the copper quent to etching and rinsing opera- eration to superior electrical con- clad panel. This printing is done tions, but also furnishes at least tact, tougher wiping contact surfaces with a chemically resistant ink, the some of the gentle abrasive action and other factors. However, electro - function of which is to resist the required to remove the ink pattern. (Continued on page 146) TELE -TECH & ELECTRONIC INDUSTRIES December 1954 75 Recent Developments in Silicon FOR the past several years the A review of silicon -tin and silicon -gold junction character- U.S. Signal Corps has sponsored research and development in the istics. Silicon devices favored over germanium because of production of single crystals of sil- higher allowable operating temperatures and lowered icon and silicon devices. Only about diode back Fusion is means to mass production. eight months ago, single crystals of current. silicon with sufficiently high perfec- tion to allow transistor fusion re- search to proceed, were being pro- By R. A. GUDMUNDSEN, W. P. WATERS, A. L. WANNLUND, W. V. WRIGHT duced. Hughes Aircraft Co., Semiconductor Div., Los Angeles, Calif. is hard to purify chemically in the It is not uncommon to produce 1500 first place, and cannot be easily zone collectors with a back current (at 1.00 1500 purified by the common methods. zero emitter current) of 10-9 amps. 1200 It has about 1/i the electron mobility at 100 volts. This is a nominal re- 1100 1000. and less than 1/4 the hole mobility sistance of 10' 1 ohms. Of little 10 r SiLICOx of germanium. And silicon crystals importance now, but of possible im- 60 700 have complicated heat treating prop- portance in the future is the enor- 600 erties in that the parameters change mously greater natural abundance of 500 400 radically for the worse upon heating silicon compared with germanium. 52'C and exhibit trapping properties at The answer to the second ques- 200300 SILICON 100 room temperature which further tion, "Why a fused junction silicon 0 a 20 30 40 50 60 TO 60 90 100 complicate matters. transistor when one can make grown Sn VOLUME PERCENT SILICON SI crystal transistors?" is somewhat Fig. 1: Phase diagram of silicon -tin system less well defined. Band Gap First, the fusion process is a much Before going into the results of harder process to develop, because the transistor research and develop- But, the band gap is 0.36 electron of the complex metallurgy involved. ment effort let us first examine two volts bigger, and when you raise F. There is a more critical need for questions: the natural base, to the power crystal perfection and therefore (1) Why a silicon transistor, in- (KT, q) X 0.36 one gets a factor more crystal research time is re- stead of a germanium transistor? of about one million to play with, quired. There are problems with (2) Why work on a silicon fusion in the lowering of the diode back the heat treating properties of the junction transistor instead of silicon current from those of germanium single crystal which must be re- grown junction transistors? devices. This means that much heated in the fusion process. From a material standpoint silicon higher operating temperatures can But, once these fundamental pro- is much harder to melt, i.e., it re- be used, and at least a gain of four cess problems have been solved, the quires higher powered, more com- in the power per unit volume of fusion process is basically a mass plex and expensive furnaces to device. The higher intrinsic resis- production process as opposed to the process; it has the nasty habit of tivity, and better dielectric surface drawn junction process, which is dissolving or sticking to almost any properties mean a considerable gain a laboratory technique extrapolated crucible material one can find. It in the maximum operating voltages. to production. We believe that the Fig. 2: (I) Steps in using a solvent metal such as tin to form a fusion junction. Fig. 3: (r) Photomicro- graph of typical silicon -tin fusion junction. Sample has been etched to bring out the junction line c 20°C 700°C N TYPE DIFFUSION eraPrA AND REGROWTH 850°C 20°C PARENT CRYSTAL (P TYPE ) 76 TELE -TECH lL ELECTRONIC INDUSTRIES December 1954 Fusion Transistors pattern followed in the case of ger- through the silicon dioxide layer manium will also follow with silicon. unavoidably present on the silicon That is, that the grown junction surface, we can use one of several method will eventually supply only methods. One might choose a metal the most exacting needs, and that with an appreciable solubility for the work horses will be fusion units. SIO., or second, abrade the surface Structural features give certain to break up the film, or third, which inherent advantages to fusion units; is the one resorted to in the case of these include such things as lower tin alloys, use a flux which forms a Fig. 5: Photo of specimen mounting jug base resistance, and greater elec- low melting glass with the silicon trical symmetry for use in bilateral dioxide and melt it away. The flux melting alkali application. in this case is a low r* fluoride such as caesium fluoride. procedure is then to place the m Fuxion Method The tin -arsenic alloy along with some 13 flux on the surface and heat the The fusion method is much more sample. The tin first melts and economical of high purity silicon forms a sphere on top of the flux. crystal. One draw from a crystal At about 850° C the fluxed silicon 0 yields 10 the drawing furnace about dioxide surface melts and allows I 4 5 6 T R .3 ale times as many fusion units as can and dissolve 0 1 2 3 alloy to wet the surface 1444 be made from one draw by the some silicon. After the solvent be- *9200W 01/115ß109 WITH 3434C4 -532O001' doping -pulling technique. comes saturated with silicon at to Fig. 6: "Punch -through" curve charac- Fig. 1 is a phase diagram of the 850° C, the fusion front comes teristics of a tin silicon fusion transistor rest along an equilibrium position. However, the arsenic atoms are still 1500 inter- SILICON COLD SvS,EN diffusing into the solid at the 1400 t 1 face, and convert the immediately 1300 - n to a depth I200 ZIRCONIUM adjacent region to -type 1100 1000 ARC LIGHT of about 1000 inter -atomic distances u0mo 900 t minutes. If we now , LIQUID SILICON few . in a time of a C 600 1 . cool the unit, the dissolved silicon 100 is 600 D will precipitate, and precipitation 500 ,TD. easiest on a seed; thus the 400 always e 4 300 S 5 x l on the 3 -- majority of silicon "regrows" 200 parent crystal as a continuation of 100 i }° ` SILiCON' I -i single crystal. Both the diffusion 20 30 so the oA0 VOLUME PERCENT SILICON S. converted and the regrown region play important roles in the device Fig. 7: Gold -silicon phase diagram properties. The dotted line repre- sents the position of the p -n junction surface of maximum ness quite small, and to use silicon just beyond the high minority of the alloy. with a reasonably penetration carrier lifetime, which is defined Fig. 4: technique ap- Fig. 3 is a photomicrograph of a Diagram of micro as the average time an emitted paratus to measure lifetime degradat:on silicon -tin fusion junction. typical electron lives in the base region be- This sample has been etched to line. Note that fore it disappears at a recombination bring out the junction when we heat the silicon tin system. The important converted region is only about center. However, the silicon crystal to 850° C. to perform feature to note is the almost com- 0.0002 in. thick. plete absence of solid solubility of the fusion operation with tin, the tin in silicon in the solid phase. This lifetime is always degraded, some- means that if a liquid solution of Npecial Problems times as much as two orders of silicon in tin were cooled slowly, magnitude. the material which first precipitates In principle, we now have a pro- In order to study the phenomena out will be almost pure silicon with cess which should be capable of of lifetime degradation on actual only a trace of tin as an impurity. making transistors; all we have to fusion junctions to make sure of If we should first add a percent or do is to make two fusions, one on our ideas, a micro technique has so of arsenic to the liquid solution each side of a thin slab of silicon. been devised to measure the life- and then cool, the silicon which pre- However, alas, there are a few prob- time by injecting carriers with a cipitates out will be strongly doped lems still confronting us. thin line of light right next to the n -type. Note that at 850° C tin will First of all, in order to have a collector and measuring the junction dissolve about 5% silicon by volume. good transistor, at least 90% of the current as a function of distance. Fig. 2 represents the steps in using emitted carriers must live long In Fig. 4 we see a schematic a solvent metal such as tin to form enough to diffuse to the collector. representation of the apparatus. a fusion junction. In order to get We thus try to make the base thick - The basic instrument is a standard TELE -TECH & ELECTRONIC INDUSTRIES December 1954 77 s I If Tin alloys are very soft, so stress Silicon Transistors (Continued) and cracking problems have not been observed. However, the low men is first cast in lucite, sectioned melting point of tin limits the device A normal to the plane of the junction, to a maximum operating tempera- polished metallographically, and ture of about 225° C. Further, the acid etched to remove the surface high chemical activity of tin pro- damage. It is then placed in this duces some etching problems re- AU jig where contact to the alloy button sulting in surface limited saturation AU -SI EUTECTtC SILICON REGROWTH and base is made with the probes. voltages of from 50 to 70 volts. JUNCTION- -" DIFFUSION By analysis of the resulting curves A second solvent choice which we CONVERTED of photo response versus distance, have is gold. Fig. 7 shows the gold - Cí REGION one can determine what the actual silicon phase diagram. This is known diffusion length is in the sample and as a eutectic system, but still main- Fig. 8: Diagram of fusion mechanism thus calculate the lifetime. It has tains the extremely low solubility been found that the tin fusions of gold in silicon when in the solid retain the same lifetime as bulk phase. The mechanism of fusion in metallographic microscope with an silicon does when heated to the this case is quite novel in that oil immersion objective lens and same temperature, but this is so neither primary constituent is any- binocular eyepiece. low that base thicknesses of con- where near its melting point at the Light from a 2 -watt zirconium siderably less than 0.001 in. are actual fusion temperature. arc, which has a nominal diameter required to yield reasonable alphas. Fig. 8 illustrates the mechanism. of 0.002 -in. is chopped to provide With reasonable resistivity material, Gold wire is pushed mechanically a 45 -cycle modulation, elongated these thin base regions often lead through the oxide film and comes in into a line with a cylindrical lens, to a phenomenon called "punch contact with the hot silicon surface, filtered to remove infra -red by a through." held at a temperature of about liquid filter, and projected through Fig. 6 shows a plot of a tin silicon 450° C. Solid diffusion of each metal the microscope optics to form a line fusion transistor exhibiting this then begins to take place until a of light on the specimen which has phenomenon. Note the low value of very thin film of material of eutectic been sliced and polished to the dynamic collector impedance in the composition is formed. This film junctions. lower region; this is due to alpha melts, and dissolves both metal sur- rapidly changing with collector faces as liquid diffusion and convec- Line of Light voltage as the space charge region tion proceeds. If the wire is now of the collector reaches closer and pulled away from the liquid, equilib- This line of light has been made closer to the emitter. Finally, as it rium will be reached. The thermo- as thin as 3 diffraction patterns, and touches the emitter, the emitter dynamic potential of the system has a nominal length of about voltage rises sharply and follows includes the crystal surface energy, 0.1 mm. The specimen is mounted linearly with the increasing collector and this fact can be used to good on a kinematic stage driven by a voltage, differing from it by the advantage (if the conditions are fa- precision micrometer, and has a voltage needed to maintain the space vorable) to determine the actual back lash considerably less than charge in the base region. shape of the liquid -solid interface. 0.0001 cm. Both photo voltaic do measurements of photo current Extreme Thinness Crystal Planes versus distance along the sample, and a special ac system utilizing a Reasonably good transistors have Fig. 9 shows this effect quite do bias voltage, have been made. been produced with the tin alloy, strongly. Notice the sharp geomet- The ac system has been designed for but the method is considered a brute ric "crystal planes" which deter- very narrow band (about 1/50 force method where a is maintained mine the interfacial shape. But one cycle/second) detection, so that by pushing the thinness of the base thing was quite wrong in this case,- weak signals could be read in the to an extreme. It is true that fairly this is the fact that on cooling, the presence of high noise. high alpha cutoff frequencies can temperature gradient was in the Fig. 5 is a photograph of the be obtained using this low solubility wrong direction, and all the silicon specimen mounting jig. The speci- alloy. (Continued on page 149) Figs. 9 8 10: (I) Junction views of gold-silicon transistor. Fig. 11: (r) Section through transistor with alpha of 0.6 at 5v and 1 ma. AU -SI EUTECTIC SILICON AU -SI EUTECTIC REGROWTH PARENT PARENT CRYSTAL CRYSTAL 78 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 age dim*" a s Sti«eet4 lføte4oá No. 29 Printed -Circuit Capacitor Design By JOSEPH F. SODARO, Registered Engineer 2924 Selby Avenue, Los Angeles 64, Calif. APRINCIPAL application of the section of this line with the T scale XXX phenolic board of 1/8 inch printed -circuit or etched -cir- establishes a turning point. A thickness. Construct a line from 5 cuit technique is the construction of straight -edge pivoted on this point on K to 0.125 on d to establish a high frequency filters or selective and intersecting scales A and C turning point. Draw a second line networks. In this application circuit shows related area and capacitance from the turning point through 9 on values. The procedure is reversible. C and extend the line to intersect A. Thus, the chart can be entered on A At this intersection read 0.1 square and C to determine a pivot point on inches as the required plate area. T on which a straight -edge may be rotated to give K and d values. Scale Multipliers Practical Example The K scale dielectric constant values may be multiplied by 10, 100, As an example determine the plate or 1000 if the answer scale is multi- area required to give 9 .wfd. for a plied by the same quantity. Capacity design nomograph for printed circuits J. F. Sodaro A K C T d parameters are held to close toler- io l0 0.005 - ance and easily formed by the print- - w ` _ 9 - ing process. High frequency capaci- U~a - tors formed by this process are two _ -a > zO -1000 plate units. One plate is printed on _ - PORCELAIN Q - ( DRY PROCESS) U X each side of the insulating board. 7PORCELAIN - 0.01 - - W The capacitance value is determined - (WETPROCESS) - by the plate area, dielectric material, W O -6 STEATITE thickness. The capaci- - a IX- and board > ILI XX ¢ tance in micromicrofarads can be - PHENOLIC ¢F -100 calculated from -5 XXX U U - - PHENOLIC n. 1 - C = 0.2244 (1) I _ Z _ d - --.a 0 - > w - in which A is plate area in square V7 -4 e- - I W z o inches, d is board thickness in inches - 0 i--10 and K is the dielectric constant. z_ z M. J (n This equation gives capacitance w - q w_co 0.05 slightly less than the actual value as Cr- -- v> z - a result of neglecting the fringing aoD - O ¢ Z U V m - - wlcx flux lines at the edge of the plates. 1 U F Z e- .4 w U m o i - W W D Lai Issing .%'umograph Cr 1.- 4 J 4 I-zi3 0 - 4 0.1 0.1-- - o 2 -Q Insulating board thickness and - material may be predetermined by mechanical rigidity requirements. Thus, the plate area is varied to ob- - 0.1 tain the required capacitance. The capacitor configuration may be square, rectangular, circular or any other shape of suitable area. The nomograph shown in Fig. 1 may be used in the solution of eq. 0.01 (1). Board dielectric constant is 0.01 1 0_5- selected on the K scale and thickness - on the d scale. These points are used to draw a straight line. The inter - TELE -TECH 8. ELECTRONIC INDUSTRIES December 1954 79 Limitations of Voltage Doubling thermo-milliammeter in order to avoid any ac voltmeter scale errors. Both decades were within 0.1% of their indicated settings. The results actually obtained showed some slight errors which have been calculated out in Table I. It will be noted that the errors and the rms current input are in- versely proportional to the total re- sistance in the circuit, and that the apparent resistance of the rectifier - meter combination are in proportion to the total circuit resistance. Al- though the error drops to a negligible amount on higher voltage ranges, it is apparent that some small error Fig. 1: Test ;et -up with thermo-milliammeter to obtain data on voltage doubling method Basic shortcomings in military specifications appli- cable to rectifier -type meters result in serious diffi- culties when attempting to meet resistance criteria THE voltage -doubling and half - source voltage, which voltage is scale methods of measuring the noted. Resistance is then set into the By H. B. CONANT resistance of electrical measuring decade according to the estimated re- Conant Labs. and indicating instruments is com- sistance of the instrument, and the 6500 "0" St. monly employed when it is desired source voltage is increased to exactly Lincoln 5, Neb. to accurately specify the resistance double that previously noted. The of a given instrument. Both methods decade is adjusted until the instru- will still remain regardless of the require the use of a resistance decade ment pointer again returns to the value of total resistance in series connected in series with the instru- original scale reference mark, and with the rectifier input. Therefore, ment, the resistance of which is to be the decade setting is taken as the re- the voltage -doubling method is not measured, and an adjustable source sistance of the instrument. the supposedly precise method when of do or sinewave ac voltage together As the Military specifies the volt- applied to rectifier -type instruments. with a suitable do or ac voltmeter to age -doubling method as one of the The clue to the observed inaccu- indicate the source emf. criteria by which rectifier -type in- racy of the method is found in the The half-scale method is appli- struments shall be accepted or re- family of curves shown as Fig. 2, cable to do instruments. The decade jected, the instrument industry is wherein A and C are curves plotted is first set to zero ohms, and the in- experiencing great difficulty in pro- from the typical current -resistivity strument is deflected to full scale by ducing low -range rectifier -type in- curve of copper oxide rectifiers vs. adjustment of the source voltage. struments, such as VU and DB me- sinewave ac current and voltage Then the resistance decade box is ters, which will come within the respectively. Curve B is the familiar adjusted until the instrument deflects allowable 5% when measured by sine wave. exactly half -scale, and the setting of the voltage -doubling method. the decade is taken as the resistance A search for the reason for failure Reference Point of the instrument. The principle of this method to indicate the re- limitation of the half -scale method sistance of low -range rectifier -type It is well understood that do in- lies in the fact that the half -scale instruments has resulted in the con- struments indicate the average of graduation seldom conforms pre- clusion that the resistance of any the current flowing in the meter cisely to the electrical half -scale rectifier -type instrument cannot be movement. In the foregoing tests, the position of the pointer. accurately determined by means of reference point on the do microam- the voltage -doubling method. meter was at full scale, or 200 µa, Instrument Pointer The circuit shown as Fig. 1 was set which means that at any given ap- up in order to obtain typical results. plied voltage, the resistance in series In the voltage -doubling method, All ac voltages were read at full- was adjusted to result in an average the instrument pointer is deflected to scale on the thermo-milliammeter by of 200 µa from the rectifier and into some easily readable scale -reference setting decade 1 on the basis of 100 the meter coil. point, with the resistance decade set ohms per volt including the 38.14 With 0.41 volt applied and only 13 at zero ohms, by adjustment of the ohm internal resistance of the ohms in decade 2, it may be safely 30 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 I II Method in Rating Instruments -meter com- assumed that substantially sinewave versely proportional to the total tion that our rectifier 13 ohms in the ac was applied to the input termi- amount of series resistance. Thus bination, plus the an ac voltmeter nals of the rectifier. The waveform the voltage -doubling method is ap- decade, represents delivered to parently precise when working with with a full-scale range of 0.41 volt, of the rectified current its ef- the meter, however, resembled curve high -range rectifier -type instru- and that we wish to determine which by the volt- C though it was modified somewhat ments, because the error is too small fective resistance, has been de- by the 13 ohms and the resistance of to be read on any meter. But the fact age -doubling method that the remains that even in such instru- termined as 1,627 ohms at full scale. the meter. It is obvious -doubling value of curve C is much ments, a small error is still present As with the voltage average to 0.82 that of curve B, and its even though the most precise meters method, double the voltage lower than 1,627 to the rms value cannot are employed in the measurement. volt and set the necessary relationship measure be the same as for a sine waveform. Another method might occur to ohms into the decade. Then, 0.41 volt me- This will explain why the rectifier some, wherein the voltage may be the voltage across the required an estimated 271.5 µa rms measured at the terminals of the ac ter's terminals and read 0.43 volt. input current in order to deliver an instrument in question, and the re- Subtract from 0.82 volt to find 0.39 of 200 µa to the meter and sult subtracted from the potential volt as the drop across 1,627 ohms, average divided to require an input potential of ap- being applied through the decade. amounting to 239.7 µa, which as proximately 0.41 volt. into 0.43 volt gives us the resist- Doubling the voltage, i.e., adding ance of the instrument, 1,794 ohms. is 0.41 volt, required the addition of The error of this method largely VTVMs 1,627 ohms, which would indicate a due to the fact that the best current of substantially 252 µa rms, are essentially rectifier -type me- and also would indicate that the to- ters, and therefore can respond only tal resistance of the setup was 2 x to average values although they are 1,627, or 3,254 ohms. Actually the precisely calibrated in rms values. wave shape of the rectified output When we read 0.43 volt, we were departed somewhat from curve C, reading voltage of a waveform re- tending toward curve B. The change sembling curve A, the average value in rectifier output waveform re- of which is obviously greater than quired in turn something less than that of the sine curve B. Curve A -current curves are clue to inaccuracy. 0.41 volt across the rectifier plus 13 Fig. 2: Low represents the rectifier input voltage A) Copper oxide rectifier vs ac sine current; drop developed by the flow of sine - ohms, and something greater than B) Sinewave; C) rectifier vs ac sine voltage 0.41 volt dropped across the 1,627 wave current. In this example, the ohms, which were added to decade 2, average value of the rectified input This would give the voltage drop voltage is greater, and that of the so that the actual rms current into resistance from greater across, a known rectifier input current is lower than the rectifier was something which the rms current could be de- than 252 µa. the 0.637 average value of a sine termined. This current divided into wave. Therefore, any attempt to de- the observed voltage across the in- termine the effective resistance of IlulpuI N'urei'urnt strument terminals would then give any rectifier -type instrument cannot us the effective resistance. In order help being in error to some degree to conduct such a voltage measure- form of rectifier -type in- As the voltage is doubled and re- when any ment, we must use a meter which strument is employed in the related doubled and more and more resist- draws substantially zero current, or ance is set into decade 2, the recti- measurements. in other words, a good laboratory Efforts to determine the effective fier output waveform departs farther model VTVM. from curve C and more nearly con- Consider from the above tabula- (Continued on page 142) forms to the sine of curve B. It can be assumed that with infinite resist- ance in series and with infinite volt- age applied, the rectifier output TABLE I waveform would closely conform to E µa Ra Rt Ri Rm Re Rr/m a sine, assuming of course that the .41 x 13 1,510* 1,627 7.75* 1,510` .82 252 1,627 1,640 3,254 3,364 3.38 1,614 input voltage was also of sine wave- 1.64 244 3,364 5,004 6,728 6,843 1.71 1,724 form. 3.28 240 6,843 11,847 13,686 13,800 .83 1,839 6.56 238 13,800 25,647 27,600 27,729 .47 1,953 At all points in the foregoing tabu- 13.12 237 27,729 53,376 55,458 55,579 ,.22 2,082 is 26.24 236 55,579 108,955 111,158 111,278 .11 2,203 lation, the actual rms current 52.48 236 111,278 220,233 222,556 222,678 .055 2,323 greater than that indicated by ap- 104.96 236 222,678 442,911 445,356 445,476 .027* 2,445 plication of Ohm's Law to the volt- * Estimated only. resistance added to double E is the sinewave source potential. age and Ra is the resistance added to decade 2 when E was doubled. for the reasons set forth above, and Rt is the total resistance set into decade 2. Ri is the resistance of the instrument as indicated by the voltage -doubling method (2 x Ra). the resistance of the instrument as instrument as indicated by the addition to decade 2 upon doubling E. Rm is the resistance of the that -doubling Re is the plus error in percent of the resistance indicated by the voltage -doubling method over "measured" by the voltage previously measured before doubling. method will always be greater than Rr/m is the apparent effective resistance of the rectifier -meter combination (Ri minus Rt). µa is the current in r.m.s. microamperes to the nearest whole number, omitting decimal frcations, the actual effective resistance. The determined by dividing the voltage added to double by the resistance added to double. amount of error is of course in- TELE -TECH & ELECTRONIC INDUSTRIES December 1954 81 Printed r-zFACE SPHERICAL` -o%FL AT By A. V. J. MARTIN, Editor "Television" 9 Rue Jacob Paris 6' France CENTER OF DEFLECTION Fig. 1 (A) Spot distortion in flat -face tube with uniform field (B) Spherical and flat -face ras. IT is a well known fact that the ter differences (C) Cross section of magnetic field in yoke on the neck of the picture tube ordinary yoke falls short of the ideal in at least two respects, one concerning the geometry of the pic- ture, and the other one its focusing. This is specially true with the more recent flat faced wide angle picture tubes, and this brings out another point becoming of greater impor- tance: the efficiency of the yoke. A high efficiency is very interest- ing since it alloys less powerful out- put tubes, and reduces the overall power needed by the receiver. It must not be forgotten that the cur- rent needed by the time bases rep- Fig. 2: (A) Using square or rectangular core is simplest way to obtain uniform resents easily half or two thirds of deflecting field. (B) Ring core is better but requires cosine winding to restore field the total consumption uniformity (C) of the re- More recent and still better approach is in castellated core ceiver. Geometric Distortion When the screen of the tube is very nearly flat, a uniform magnetic field of deflection does not produce a uniform displacement of the spot (Fig. la). The sides of the screen being farther away than its center from the center of deflection, the length of the electron beam is greater off center and, for the same angular displacement, the spot Fig. 3: Magnetic field plots of ordinary yoke in Fig. 2 (B) & (C) moves a greater distance. The difference between the rasters obtained on a spherical and a flat faced tube is shown in Fig. lb. It is seen that, in the last case, the sides of the raster are bent inwards, and this peculiar form of geometric dis- tortion is called "pincushion distor- tion." Uneven Focusing Fig. 4:(A) Usual shape coil cannot be entirely free from end -effects (B) Interlaced ellipti- cal coils eliminate end -effects (C) Planar view of printed crossed -field deflecting coils Since all parts of the screen are Fig. 5: Magnetic field plots for crossed field coils. not the same distance away from the center of deflection (Fig. la) it is immediately apparent that if the focusing is correct at the center, it will be incorrect near the sides. This is shown in Fig. la, where the beam goes through its minimum cross- section (point of focus) before it reaches point O on the flat faced tube. Another cause of bad focusing is 12 13 5 shown on Fig. lc, and is due to the actual distribution of the magnetic field. Fig. lc represents the cross - 82 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Crossed -Field lJe1leetin Coils Revolutionary new design by Visseaux Laboratories in France solves many of the problems associated with inexpensive and efficient TV deflecting yoke designs Equipment used to plot magnetic field inside deflection yokes. Note 3D field model section of the neck of the picture core (Fig. 2b) , but in this case the tube half -way along the deflecting field produced by an ordinary coil pensate for the geometric pincushion yoke, and the shadowed surfaces is not uniform, and the winding must distortion. For example, a uniformly show the shape of the electron beam be graded, according to a cosine law, distributed winding of the deflecting at three different places. If this to restore the field uniformity. coils will produce a barrel field and shape is round at the center, giving A more recent and 'still better way a pincushion deflection, whereas a a round spot, it becomes oval on the calls for a castellated core (Fig. 2c), concentrated winding will produce a sides and gives a distorted spot, and the windings being inside the pincushion field and a barrel deflec- hence a bad focusing. notches, either with the ends bent - tion. But the extreme positions of the up or in toroidal form. As previously, beam inside the yoke correspond to the winding must be graded to ob- Correction Computation extreme positions of the spot on the tain a uniform field. The efficiency screen, and this kind of distortion, is the highest that can be obtained at The exact amount of correction distinct from the first one, turns out the moment with this type of con- necessary for a flat faced picture tube to be also particularly annoying near struction. can be computed with the help of the sides of the screen. But, as we have seen, a uniform Fig. la. The theoretical deflection field is definitely not suitable with on a spherical picture tube would the sine of the Uniform Field modern flat faced tubes, since it be proportional to would give rise to a marked pin- deflection angle, whereas the actual The simplest way to obtain a uni- cushion distortion. deflection on a flat faced tube is pro- form deflecting field is shown in Fig. This could be counterbalanced by portional to the tangent of the de- 2a, using a square or rectangular an equivalent distortion of the op- flection angle. core. It is not used much because it posite type, that is with the sides The field must increase when the is too wasteful of energy, all the bent outwards. Such a distortion is angle of deflection increases; hence, field not being concentrated inside called "barrel distortion." it must be a pincushion field. the neck of the tube. From there springs the idea of The necessary variation of the A much better way is to use a ring producing a distorted field to com- (Continued on page 140) Fig. 6: Close-up view of printed coils designed for crossed -field deflection applications. These coils without core give the same deflec- tion as a conventional yoke with a high permeability ferrite core. Design also represents about a 25% improvement in circuit energy TELE -TECH & ELECTRONIC INDUSTRIES December 1954 83 Glow Transfer Tubes for Counting Multi -element tubes employing principle of anode - no external signals are applied. (The cathode arc sequencing are finding applications in digital reason an arc forms to only one ca- computers thode is because the firing voltage is and radar equipment. Counting rates go as higher than the maintaining voltage, high as 4000 cps and therefore, once an arc is formed, the maintaining voltage assumes control and no other arc is formed.) By PHILIP CHEILIK, W. L. Maxson Corp. To cause the tube to count we apply 460 W. 34 St., New York 1, N. Y. a negative voltage pulse of about 100 volts to one guide, immediately fol- lowed by negative on THE glow transfer tube is another pulse one of 36 for a twelve count tube), in a the other guide. a number of counting This will cause the tubes circular arrangement. For each arc to transfer to the next cathode. which have recently been developed, count, the tube has a cathode pin most of the development If the order in which the two guides having plus two guide pins; i.e., a twelve are pulsed is reversed, the tube will been done in England and the Neth- count tube will have twelve cathode erlands. count in the opposite direction. Arc The use of these tubes in pins and twenty-four guide pins. current counting circuits represents flowing in the selected ca- an im- Between successive cathodes there thode causes a voltage drop in the portant advance in the art of pulsing are two guide pins, each going circuits. to a cathode resistor, which thus gives a separate guide bus. The tube is dc level at that cathode. The There are a number rise of types of symmetrical about its center, so that time of this dc level depends upon counter tubes, most of which are if we start with any cathode either K, and the rate at which the arc settles on cathode ray types, or the travel in a peripheral manner we types which the cathode. This is fast enough so employ the mechanism find the following sequence of that ac coupling with reasonably of glow transfer. The glow types are pins: K1, G1, G2, K2, Gl, G2, further 1(3, G1, sized capacitors can be used. subdivided into the one etc. (This is illustrated in Fig. 1.) guide unidirectional type and the There is a resistor in each cathode two Operation guide bidirectional type. The circuit from which a signal may be use of the two guide glow transfer taken. The mechanism of glow transfer tube in counting circuits will be When the anode voltage is turned occurs in following described the manner: here. on, an arc is formed between the an- When a negative pulse is to The glow applied transfer tube consists ode and one of the cathodes, the guide G1i the voltage difference be- of a central disc, which serves as process by which the cathode is se- tween anode and G1 is much greater the anode, surrounded by a number lected being a random one, since the than that between anode and ca- of pins (30 for ten count tube and tube is completely symmetrical and thode. The arc will then transfer to Fig. 1: (I -upper) Basic structure glow of transfer tube consists of guide and cathode pins surrounding cathode. Fig. 2: (l -lower) Circuit for converting positive pulse to negative pulses to drive tube. Fig. 3: (r) Signal waveforms appearing at various points in circuit WAVEFORMS FOR A TEN COUNT TUBE INPUT LULL_ GUIDE I J GUIDE 2 11 _JJ ll , l #0 CATHODE] #1 CATHODE #2 CATHODE ETC. 84 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 1 II 62 Circuits GI 390 330K ISOK the nearest G1 pin. A negative pulse on G,i following the one on G then RESET LINE causes the arc to transfer to the next guide pin. This second pulse should /212AT7 immediately follow the first one. When the second pulse disappears, the guides will rise to a high voltage O.luf because of the guide current in the i FROM INHIBIT GATE large guide resistors, and the arc will transfer to the nearest cathode, which will be the next one. Thus the Fig. 7: (I) Reset with switch tube which cuts off when signal appears, allowing tube has counted one count. reset line to drift up. Fig. 8: (r) Similar "forced" reset switches 200 volts to line Gp the and cathodes, with the GI A circuit for converting positive guides Ki Kp K, ETC. KO of reset cathode, since 4TOK input pulses into the negative re- exception the 390 330K K 150K 150K 150K 150 quired to drive the tube is shown they are disconnected will drift to- voltage. (This is a RESET LINE in Fig. 2. Essentially, it is a cathode wards the anode coupled univibrator with outputs characteristic of the tube.) This up- taken from both plates. The signal ward drift in voltage on these ele- from the negative going plate is cou- ments has the same effect as apply- .Gp pled into one of the guides through ing a positive voltage to them, so K1 Kp K, ETC. o a large capacitor. The signal from that the tube resets. 390K 30K going plate is coupled 3. The third method (Fig. 4c) is to r150KÌ150KI50K 50 the positive ií77 through an RC differentiating circuit connect all the cathode and guide ij RESET LINE to the other guide. Fig. 3 illustrates resistors to ground and to apply a signals appearing at various points negative voltage to the reset cathode. in the circuit. The positive portion of Tb,io forros the are to transfer to K., GO is lower than GI the differentiated pulse does not af- because its potential K KK,, ETC lyl of the counter all other elements. 390 fect the operation the 30K 150450K `I`y 150K tube. The univibrator which has a Each method has its advantages 150 pulse width of 500 µs is designed to and disadvantages. A consideration give approximately 140 volts swing of the requirements will decide on each plate. This allows for a which method of reset is most suit- Fig. 4: Methods of accomplishing reset. (a) counting rate of about 2000 cps. able. The first two methods de- Positive voltage on reset line. (b) Floating 4000 cps can be are similar in that reset line. (c) Grounding and negative reset Counting rates of scribed above achieved by halving the size of the both cause the reset line to rise timing capacitor. The tube is limited above ground level, while the reset to a counting rate of 4000 cps be- cathode remains close to ground cause of the time required for the level. (The reset cathode is above arc to transfer and settle. For slow ground by the magnitude of the counting rates, the tube provides a voltage drop in its cathode resistor.) visual indication of the position of The difference between the two OUTPUT the count. methods is the speed with which the cathode resets. The drift reset re- Reset Cathode quires approximately 0.1 second, while the forced method is consid- TO RESET LINE In addition to making the tube erably faster. The main disadvan- -ISV count, we can also cause it to reset tage of both these methods is the at any time to any predetermined fact that as the tube is reset, the rise. Fig. 5: Inhibit gate eliminates positive pulse cathode. We shall hereafter refer to reset line experiences a positive this cathode as the reset cathode or Thus, the cathodes all experience a Ka. There are three basic methods positive rise, and the output gets a Fig. 6: Circuit for automatic resetting of accomplishing this reset. They positive pulse. This can be very ob- are: jectionable; therefore, we must find +300 1. By connecting all guides and a way to eliminate it. reset cathode 47 K cathodes, except the through their resistors to a "reset Inhibit Gate 1/2 6AL5 line" (see Fig. 4a) and by causing a positive voltage to be put on the re- One way to eliminate this positive use an "inhibit" 1/ 212AT7 set line, we see that since KG is much pulse would be to lower than the other cathodes, the gate, such as the one shown in Fig. arc will transfer to it. 5. The output signal from any ca- 2. A second method (Fig. 4b) thode goes into the grid, and the ca- similar to the first is to open the thode is connected to the reset line. reset line and let it float. Now, all If there is an ordinary signal on any $5 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 1 r- grounded, so that if we reset the Glow Transfer Tubes (Continued) tube, there is no extra pulse, and we do not need the inhibit gate. However, if we are taking an output from K0, there will be a negative DRIVER TI K. K. K. K. K. K, K. K. pulse in the output during reset. SHAPER-*GI K' lut This can easily be eliminated by using a series diode in the output coupling circuit. + 100 + 300 Si 4 Automatie reset DRIVER -.G2 12 2.2M It is possible to reset the glow K, K. K. K. K. SHAPERGI K. K, K. K. o transfer tube manually, by appro- it lof 0.10 priate hand switching; however will usually be required to reset it 1P11,Mi I pf OUTPUT automatically in order to enable the tube to count to any number less lo/2 12ÁT7 than the maximum number. If no T3 IM DRIVER --Gl-.52 K , K. K. K. K. K. K. K. K. 6BC7 reset is used, the tube will count its SHAPER maximum number and then begin over. For instance, the count will proceed as follows: K10f K11f Ko, K1, K2, etc. If it is desired to count to S3 t three such as K1, K K3, K,,, K1, we must reset the counter tube auto- Fig. 9: Cascaded 10 -count tube circuit for counting up to 1000 matically when the count reaches K3. A circuit for causing this reset cathode, of the counter tube, the equally with the grid so that there is shown in Fig. 6. When a pulse cathode of the gate, which is con- is no output. The third means of from any preset cathode appears, the nected to the reset line, remains at reset described above was that by plate drops, causing a negative pulse ground potential, and the gate acts which a negative pulse is applied to to appear at Ko. as an ordinary amplifier. However, Ko, in order to effect reset. Here we Circuits for effecting automatic re - during reset the cathode rises see that the reset line is permanently (Continued on page 153) Subharmonic Crystal Oscillator ASUBHARMONIC crystal oscil- IK IW 1-250V lator circuit recently constructed 25MA. at the National Bureau of Standards combines simplicity with versatility. The circuit requires only a single triode tube in a blocking oscillator circuit, coupled to a quartz crystal. Each output pulse of the oscillator "shock excites" the crystal, and the voltage generated by the crystal as it continues to vibrate or "ring" syn- chronizes the oscillator at a submul- tiple of the crystal frequency. With some crystals the circuit has been operated successfully at division ra- tios as high as 10,000 to 1, producing harmonic -rich output at 100 cps controlled by a 1000 kc crystal. The present circuit was a chance discov- OUTPUT ery of Dr. M. C. Thompson, Jr. of '0.7V V M S the NBS Sound Section, who, while working on a project sponsored by the Office of Naval Research, noticed that some equipment was oscillating in an unexpected fashion and pro- ceeded to analyze and take advan- 6.3 V tage of the phenomenon. Although a search shows that a. patent for a similar circuit was granted to W. A. $250V (Continued on page 161) Subharmonic crystal oscillator circuit 86 TELE -TECH 8. ELECTRONIC INDUSTRIES December 1954 Gain Stabilized I -f Transformers Toroidal coils and boron -carbon resistors are combined in military aircraft application to produce amplifier with no gain change over 125°C temperature range 111111111111111111111111111 Fig. 1: Stabilized i -t transformer in can By JOHN F. CLEMENS designated the ARN-32 and is this transformer is set at 90% of Project Engineer equivalent in performance to its critical. The shape factor is 3.9. Crowley Div., Avco Mfg. Corp. Cincinnati, Ohio predecessor and prototype, the ARN-12. In Fig. 2 the two receivers Q lleyniremeels are shown side by side with dust IN many types of equipment fluc- covers removed. On the right is the The first i -f transformers con- tuations in the gain of a receiver ARN-12 and on the left the minia- structed for the Marker Beacon are unimportant because of AVC and turized version, the ARN-32. The receiver were of very conventional hearing characteristics. A 6 db cubic volume, weight, and power design. Both primary and secondary change in gain, for instance, will consumption have all been reduced were wound on a common form with ordinarily go unnoticed in a com- to 1/a their respective values com- inductive coupling. Both coils were munications receiver. However, pared to the ARN-12. It was in de- slug tuned. To obtain the desired many automatic equipments such velopment of i -f transformers for shape factor it was necessary that as direction finders or similar air- the miniaturized set that the problem the primary and secondary coils craft navigation aids are not nearly of gain stability with temperature have Q's of 50. Since the Q of the so tolerant in this respect. One of became important. winding itself was 60 to 70, a 68,000 the cases which imposes severe re- The i -f transformers developed are ohm composition resistor was used to quirements of gain stability is a typical of transformers used in many load the coils to the desired Q. Af- Marker Beacon receiver. This air- equipments, and it is hoped that the ter temperature compensating ca- craft navigation receiver operates techniques to be described which pacitors had been installed to elimi- by pulling in a relay when the signal stabilized the gain may be useful to nate frequency drift the transformers reaches an arbitrarily set level. others who encounter this problem. were evaluated. Several defects were We were given the task of devel- The i -f frequency used in this set discovered. Most important, the gain oping a miniaturized Marker Beacon is 6900 xc. The i -f amplifier uses 3 of each transformer increased by receiver for military aircraft. The transformers and the bandwidth at 6 28% as the temperature dropped miniaturized set which resulted is db down is 140 xc. The coupling in from +50 to -50° C. In addition, the Fig. 2: Comparison of miniaturized (I) and regular (r) marker beacon receivers response curve which was symmet- rical and single peaked at +50° C became unsymmetrical and double peaked at -50° C. The i -f amplifier using three of these transformers showed a 6 db gain increase as the temperature dropped 100° C. Since the specification allowed only 3 db variation in sensitivity for the set as a whole from all environ- mental changes, including a 24 to 29 v. supply voltage change, it was ob- vious that the i -f transformers were completely unusable. Drift Far(ors The i -f transformers were ana- lyzed in detail and their defects listed. It was found that the Q of each winding of the transformer in- creased by 23% as the temperature was decreased 100° C while the re- sistance of the loading resistor in- creased 6% under the same condi- tions. In addition it was found that (Continued on page 136) TELE -TECH & ELECTRONIC INDUSTRIES December 1954 87 Design for a Printed Subminiature C 80° C and to Use simplification of range of -55° to of etched circuits permits withstand shock and vibration i -f designs and resolves severe design parameters forces of 10 G's. 3. Limited space was allotted, and this necessitated subminiaturiza- tion of the amplifier and of its By BERNARD RABOY & JOHN R. ENDICOTT, Electronic Design Engineers The Glenn L. Martin Co., Baltimore, Md. tubes and other components. 4. The amplifier was to be de- signed as a basic configuration suitable for future i -f development. r and mainte- IT seems that most new designs for opment, manufacture The techniques for elaboration of nance. There are others which are intermediate frequency amplifiers i -f ampli- device and the Martin subminiature are the results of time-consuming special to the individual fier and its components were re- to service. In the devel- trial and error development tech- its expected solved from these design parameters. niques. Each such new layout or opment of a Martin subminiature, intermediate fre- The etched circuit technique was modification raises its own problems high -gain, radar for A strip of chosen layout purposes. of gain, band -width, size-and little quency amplifier, this second set cloth, with as fol- of fiber glass bonded value is salvaged from earlier effort. criteria may be summarized Epon resin, forms the base material. Recent Martin experience, however, lows: Then 0.027 in. copper is fastened to suggests that i -f development can 1. The amplifier was to deliver 115 be simplified-and that, simultane- db of gain with a 1.8 Mc band- ously, the most severe design pa- width centered at 30 Mc, and was rameters can be resolved. to incorporate 80 db of gain con- trol. tun dnnaentaai 1araanaetern 2. The unit was expected to en- dure the combined environmental Some parameters are fundamental conditions of temperature, pres- to all good design. These include sure and vibration which are en- such goals as regeneration -free, countered at high altitude. Spe- stable operation, as adequate heat cifically, it was to be designed to dissipation-and economy in devel- operate within a temperature J. R. Endicott B. Raboy Fig. 1: Tape master for the top and bottom sides of the i -f am- plifier etched circuit. Black tape of master masks areas of copper facing both its faces. This copper facing is etched away to delineate the circuit leads and connectors. An enlarged drawing of the de- sired "wiring" is made with black tape of proportionate width, as shown in Fig. 1. Doughnut -shaped pieces of tape are used for com- ponent tie points, and to these, eye- lets are connected for reinforcement in the final assembly. The tape can be applied quickly and corrections are easily made. The drawing is photographically transferred to the copper facing of the fiber glass base for etching. As illustrated by Fig. 2, both sides of the base were etched-because of the attending advantages in com- ponent placement and interstage lead length. Components Used The severe environmental consid- erations dictated, in large measure, the selection of components. The tubes used were 5702 WA for the i -f stages-and 6111 was selected for the cascode low-noise amplifier. Two types of resistor were needed. 88 TELE -TECH 8. ELECTRONIC INDUSTRIES December 1954 I -F Amplifier The 1/2 -watt, carbon composition type was used for non -critical de - coupling lines and the 1/4 -watt de- posited -carbon type was selected for the few critical spots-such as tuned circuit -loading resistors- where wide resistance changes af- fect performance. In most i -f ampli- fier applications, however, the 1/2 - watt, carbon composition resistors are satisfactory. Because of space limitations, high .K -type capacitors are the most suit- able decoupling capacitors, although they exhibit large variations in ab- solute capacity with extended rises Fig. 2: (Above) Photo of both sides of seven cathode grounds were made to an- inch unit with cover removed. Design features other. high reliability, simplified production and cir- is cuit uniformity. Fig. 3: (I) Cover plates are The assembly stable. Evidently, held together by sliding clips, not screws the spring fingers-intended as heat dissipators-assist in providing good electrical shielding. Critical ground- in temperature. Such changes are and filament decoupling chokes. On ing adjustments were unnecessary, greater than two -to -one in some the other side are mounted the re- and this was demonstrated by isolat- cases. These components are small maining networks: the grid, cathode ing the case with paper strips from enough, however, so that capacitors and plate. the etched board. of sufficient value can be selected to Environmental tests were made suit the anticipated temperature Sliding Clips to determine whether the heat gen- range without creating space prob- erated by the amplifier tubes was lems. The case was designed to facili- adequately dissipated and to meas- The i -f coils were wound on com- tate maintenance of the assembly, ure the operating temperatures of mercially available coil forms. Bifi- and therefore, the overall utility of the unit's various components. These lar windings were employed to the amplifier is enhanced. The case measurements are diagrammed in eliminate interstage coupling capac- opens so that all of the components Fig. 4. At an ambient temperature itors. Wherever possible, standard are readily accessible and the cover of 25° C, the temperature of the commercial components were used. plates-as shown in Fig. 3-are held outer case rose to 42° C. The hottest This obviated the use of costly coil together by sliding clips instead of spots within the assembly were the forms and tuning slugs. screws. These clips are stainless tube glass envelopes. The base of the Because of the absence of circu- steel tubing which have been slit input 6111 reached 114° C and the lating air, heat dissipation is always length -wise and opened to the interstage 5702 WA tubes stabilized a serious problem in subminiature proper aperture. at 103° C. units. The only practical means for On examination, it can be seen The air inside the case was re- cooling appeared to be conduction that the parameters for a small, corded at 79° C, and this was the to a large metallic area, or heat high -gain radar intermediate fre- operating condition for most of the sink. This was accomplished in the quency amplifier were resolved in passive components. Any increase in design of the case and shielding. this design. the external ambient temperature, Spring fingers maintain mechanical The prototype operated with no however, raises the temperature of contact from tube envelope to tube trace of regeneration. Only the nor- the components proportionally-as shield to outer case. mally prescribed precautions with they operate in actual service. Each component has adequate regard to grounding and bonding The amplifier has met the specific spacing for accessibility. On one side were necessary. Shielding and fila- environmental standards by oper- of the etched base are arranged the ment grounds were made to a com- ating successfully at the specified tubes, tuning coils, loading resistors mon point-and the plate, grid and (Continued on page 151) TELE -TECH & ELECTRONIC INDUSTRIES December 1954 89 Transistor 100 -cycle unit utilizes printed circuit con- struction, and provides accuracy of better than 1 part in 10,000 from -40° to 140° F quency standard are that it be small, Fig. 3 will not oscillate with a low Fig. 1: Top & bottom views of printed circuit frequency standard show component arrangement compact, reliable, capable of oper- activity crystal. The equation for ating on low power and that it must oscillation in Fig. 3 is have an accuracy of 1 part in 10,000 R. By J. H. SMITH, JR. or better over the temperature range a 1 { & MARK CAMPBELL L c Texas Instruments, Inc. 6000 Lemmon Ave. Dallas 9, Texas r 81(C OSCÌLLATOR PULSE FORMÌNG AMPLIf1ERT -CZ DIVIDER 1 I 103 T1200 1 TI - 1I201 TI 1120011 TI201 200 1 THE most common method used 1 - I I G.E in the exploration for oil is the I GB G.C.t GE G.C.6B 1I comparison of reflections from the L_ _ _ --1 ------_L---= 4 --- earth as the result of the explosion of a charge beneath the surface. This comparison is usually made by 2ND4VIDER- means of a multi -channel recording T 10 TI201 h is I camera. The earth's structure in- I COINCI DENCE AND OUTPUT CIRCUIT dicated by the time difference be- I G.B. G.C. I RN-P I tween reflections from the same -1 as they arrive at evenly --pl 3 51VIDER structure G.B. spaced seismometers. In order to ac- -1 TI103 1I201 curately interpret this information, G.B.= GROUNDED BASE it is necessary that the camera tim- G.B. G.C.--JII ing markers be accurate to one part G.C.= GROUNDED COLLECTOR L-- -- in 10,000. The timing lines are ob- G.E.= GROUNDED EMITTER tained from a tuning fork controlled motor. Fig. 2: Counting circuit with oscillator, dividers, pulse forming amplifier and coincidence circuit Description Figure 1-a and 1-b show the com- from -40 to +140° F. Using typical values of 5 K for R°, pleted assembly which makes use of The block diagram of Fig. 2 shows 25 K for R°, and a large value for RL, printed circuit techniques and min- the counting arrangement. It con- we find that a must be greater than iaturized components including TI sists of the 8 xc crystal oscillator 6, whereas the nominal value for a type 103 point contact transistors and pulse forming amplifiers, divide is 2 to 3. and TI 200 and 201 NPN junction by four counter and amplifier, and In the circuit of Fig. 4, the voltage transistors. The 8 xc crystal is a low two parallel branch dividers which across RL is low except at resonance. activity unit with a series resonant divide by four and five. The output The full output current from the impedance of approximately 25 K from these two dividers (400 and grounded collector stage is coupled ohms. 500 CPS pulses) are coupled into a into the input of the grounded base The requirements for the fre- coincidence type mixer transistor. stage, and a current gain without The mixer circuit arrangement was phase reversal is obtained and the used first because the frequency di- circuit will oscillate. Since the stages the Fig. 3: Simple transistor oscillator circuit viders did not operate satisfactorily are considerably over -driven, at 100 CPS and secondly because of output can be differentiated directly the fact that if either of the three to produce triggering pulses. divider circuits are malfunctioning The output from the oscillator is the output frequency is so far re- coupled to the input of the trigger moved from 100 CPS that it is quite amplifier through a condenser (.001 obviously faulty. A grounded col- mfd) which provides light loading lector stage is used to couple the and differentiates the waveform to output of the mixer circuit to a low produce trigger pulses. This pulse impedance galvanometer type re- is amplified and inverted by a corder. grounded emitter stage and coupled This oscillator circuit, Fig. 4, was into a grounded collector stage which used because the simpler one tran- supplies the necessary power to sistor negative resistance types of drive the first divider. 90 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 1 II by using a coil of sufficient Q with a tap about 1/2 or 3/4 up from ground. Even with this excellent Frequency Standard stabilizing feature, the free -running frequency tends to increase some- what with temperature. Thus, a di- vide -by -four stage might eventually A major, but not insurmountable, the reverse direction and the cycle alternately divide by 4 and 3, and problem associated with transistor is reiterated. The stabilizing effect then continuously by 3; however, low frequency standards is reliable is produced by replacing the base an increase in temperature reduces operation of the frequency division resistance with a high -Q tuned cir- the gain in the uncompensated mechanism. This problem is of little cuit whose resonant frequency is N -P -N junction pulse amplifiers, importance as long as the ambient equal to the quotient frequency. causing a decrease in pulse height. temperature is relatively constant. These waveforms are also shown in This latter effect compensates for However, field use requires opera- Fig. 5. the former. In one test, triggering tion under widely varying tempera- The base circuit receives its energy pulses from the 8 xc oscillator were tures; in such circumstances, the from the pulse produced when the observed to decrease by 3:1 from transistor equivalent resistances may collector capacitor is discharged and room temperature to 145° F, yet the change several hundred per cent. first divider continued to operate Therefore, practical transistor di- with no sign of instability. Fig. 7 viders must employ an effective shows typical waveforms of second means of stabilization. and third divider when operating Some success was attained by normally. using a special blocking oscillator circuit. The circuit that was finally Pulse Variation decided upon is a modification of the simple astable negative resistance uzf/ 1 When the divider switches, it pre- oscillator using a point contact tran- sents a radically different load to sistor as shown in Fig. 5. ' the grounded collector pulse ampli- fier, causing a variation in pulse F= height to appear at the input of the Collector Circuit amplifier at the time of switching. Since the pulse amplifiers for di- A capacitor was added to the col- viders No. 2 and No. 3 have a com- lector circuit and the time constant mon source, this variation will ap- of the collector and emitter circuits L nnsvvvss pear at the input and output of both made the same order of magnitude. pulse amplifiers and may cause un- The emitter and collector circuit ca- reliable division in both frequency pacitors charge through the reverse fig. 4: Transistor circuit used which will dividers. A simple diode clipping cir- oscillate with a crystal of low resistances of their respective cir- activity cuit was placed across the input to cuits, providing a slow exponential the pulse amplifier which triggers rise on the emitter and an exponen- will oscillate until a swing of the No. 2 divider to equalize pulse tial decay of collector voltage toward base sinewave in the negative direc- height. -12 v. During the process, a region tion coincides with a high positive In Fig. 8B is shown a dual -beam of negative resistance will occur. going pulse on the emitter which oscillogram of the collector wave- When this happens, the capacitors drives the transistor into the satura- forms of dividers No. 2 and No. 3. discharge quickly through their re- tion region. If the base sinewave The frequencies involved are 500 spective forward resistances, pro- voltage is large enough to primarily CPS and 400 cPs respectively. The ducing a sawtooth wave similar to determine the free -running fre- arrows show where coincidence oc- a vacuum tube relaxation oscillator. quency, the stability of the circuit curs. Discharge of the capacitors carries as a divider will be greatly in- These waveforms are introduced the transistor outside the negative creased. into the emitter of a grounded base resistance region. The emitter and In practice, then, it is desirable P -N -P junction transistor as shown collector diodes are then biased in to make the sinewave voltage high (Continued on page 134) Fig. 5: (I) Blocking oscillator provides stable frequency divider stage. Fig. 6: (r) Waveforms in transistor coincidence circuit .005 rOMt3 DIVIDE 'UALÄÄLLILLL i»e, OLLECT° errMrr .005 100,POSITIVE R P N -P PULSE TO :7,00. FROM GROUNDED #2 DIVIDER 92K COLLECTOR COLLECTOR AMPLIFIER 22K e RT THERMISTOR. AT 32000n 12V 25°C. SCHEMATIC GF COINCIDENCE CIRCUIT TYPICAL DIVIDER STAGE TELE -TECH & ELECTRONIC INDUSTRIES December 1954 91 CUES for BROADCASTERS Practical ways of improving station operation and efficiency They are invited to hand out "gripe Caution! Hands and parts must be $$$ FOR YOUR IDEAS reports" to the engineering depart- washed after using cyanide, it is a ment concerning technical (equip- deadly poison. The spade lugs won't Readers are invited to contribute their ment) trouble and inadequacies ex- stand bending too many times. own suggestions which should be short perienced. We usually note the trou- and include photographs or rough ble and take corrective steps while V.U. Meter Protection sketches. Typewritten, double-spaced doing the studio weekly mainten- text is requested. Our usual rates will Engineer, nance, unless it is really serious. PHILIP WHITNEY, Chief be paid for material used. WINO, Winchester, Va. Push Button Switches MANY types of electronic equip- ment, including the Ampex CD Cluster Control Unit ARCH SLATER, CKOC, model 350 tape recorder, are so de- Hamilton, Ont. EDWARD J. WHITE, 136 Woodlawn signed that the VU. meter . is either St., Chicopee Falls, Mass. PUSH buttons in consoles are mounted flat or in a sloping position. usually multi -wired, depending This has caused some trouble be- WHEN WMAS, Springfield, Mass., on the number of actions desired, cause of glass breakage on the was designated as the cluster and it takes several hours to remove meter. An operator who is busy load - control (sequential operation) sta- tion, we were faced with the problem of building a unit that would control 640 CLUSTER 1240 CLUSTER both the 640 and 1240 kc. fre- quencies. The drive unit is a 400 CD PRY cycle selsyn converted for 60 cycle LOOP operation. Rotary switches #1 and #2 are wiping contact attenuators, with the stop pins filed down even with the contacts to allow 360 degree rotation. It is also necessary to insert an extra pin between the stop pins to provide constant contact with the wiping control arm through the Rev, s4 100 IL 360 rotation. The contacts are strapped as indicated, and cross - SHAFT connected. The more stations that OUPLING / 100 n \ 80 w participate in the clusters, the less Ro/ sw. RD/ sw.2 R0 SW. will be #1 ! #3 cross -connecting necessary. (o 40V AC Rotary switch #3 is a commutator + 117 V AC segment alternator, and only one p Ro/Svtl 36 TAPS -STRAPPED 10-4-6-8-53 I R,,/SWA2 TAPS - STRAPPED 13-8-10-5 segment is used for circuit operation. EX- TUBE 36 CHECKER Rqw}4 180° CONTACT- 360° ROTATION (5 POLE) The switch (Ro/sw #3) kicks TRANS. rotary #4 once for every revolution of the motor shaft. Rotary switch #4 is for the purpose of garbling the CD cluster control circuit employs selsyn drive unit to control 640 and 1240 kc order in which the stations are tripped on and off. This switch is a and tab all the wires soldered to ing a tape recorder can easily allow. 6 pole (one not used) 180 degree the contact points. We clean and a tape reel to slip and break the contact, 360 degree rotation. Relays repair tensions on push buttons glass, damaging the meter as well. Ry 1 through Ry 5 are 24 volt relays. without taking off a wire. Dismantle Upon installation of several of these the button deck by twisting the recorders at some of our stations, Interruption Reports spade lugs, and lift back the top we made a simple and inexpensive wired contact deck. Left out the protector for the meter. JOHN WHITACRE, Chief Engineer, slider slugs and dip in a solution of A piece of clear plexiglass was cut WILS, Lansing, Mich. 3 oz. potassium cyanide and 1 pt. to the size of the VU meter case, and THE F.C.C. requires that any in- water (a smaller quantity mixture cemented over the top, with holes terruption to the carrier or pro- will clean all the contacts you have) drilled as to provide screwdriver gram be logged in the transmitter wash off in water and wipe dry. Oil access to the retaining screws hold- log. At WILS-AM we not only log it with a suitable contact cleaner and ing the case in place. Some trouble but also make out an interruption replace slugs, after cleaning and re- was experienced with the loosened report, a copy of which is filed with pairing the wiper points on the cement so subsequent installations the chief engineer and a duplicate wired section. This solution also were made by fastening the protec- with the program director. WILS- works on silvered platinum contacts, tive plastic plate on with "Scotch" AM uses combination announcer - and can be stored and rewatered for tape. No breakage has been reported studio operators with the emphasis use again. at any station since this safety meas- placed upon announcing ability. The whole job takes about 1/2 hour. ure was taken. 92 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 As an added convenience, we in- The buzzer is used as an external isolated headphone jack was also in- stalled a tape splicer atop the alarm in the studio hall. The control stalled directly below the V.U. meter. housing containing the heads. The room signal is a 100 watt bulb with A panel fashioned from an old alu- sloping panels would not allow the a wafer type blinker inserted in the minum disc with three Cannon XL operator to place the splicer at any socket with the bulb. These remain receptacles mounted thereon was in- convenient position when working on until the alarm reset is depressed. serted in the front of the cartridge on the tape. Therefore two holes In case the operator is in another chamber. The front escutcheon plate were drilled in the splicer and part of the studio, we run our office was reversed and three Centralab countersunk. Flat headed screws and hall monitor buss through relay Delta T Attenuators were installed were used to fasten the splicer to No. 2. When the alarm trips, it cuts in the positions formerly used for the the top of the housing, using the the program off the monitor system tone control, function switch and holes already provided to hold the and inserts our key station audio at volume control. housing in place. Therefore, the twice our level. This not only alerts The old output transformer preamp splicer is in the most convenient the operator but enables him to hear was used as an additional filter position for a quick splice job. the Conelrad instructions no matter choke, and a new output transformer where he is. In the studio, the key was installed in the position formerly Anti -Fading Conelrad Alarm station can be monitored on the con- used for the drive motor. It should noted here that because of the ROBERT HOLT, Chief Engineer, trol board earphones. or a special be of motor opening in the KATE, Albert speaker. size the Lea, Minn. chassis it was necessary to make an WE use the Allied alarm amplifier 3 Channel Remote Amplifier adaptor plate for the new output hooked to the AVC of a Halli- transformer. Only slight changes are crafters S-56 receiver. Being on the W. W. BLAIR, WCMB, Harrisburg, Penna. necessary in the inverse feedback fringe area, our key station is subject circuit for flat response from 30 to to fading in the evening. This causes MANY radio stations have RCA 15,000 cycles per sec. our alarm to trip often. The original Wire Recorders decorating their Allied alarm 5000 ohm control is too shelves because of the unavailability Converting Turntables to "45" large to permit critical adjustment of the wire cartridges. Ours no longer when operating off a small change in collect dust on the shelves as we RICHARD W. JOHNSTON, WHRV, AVC. Since making the following have utilized them in many ways; Ann Arbor, Mich. change we have not missed a single one is used as a disc cueing amplifier HRV has applied a conversion bi -weekly test alert and have not at our transmitter, one is used as an system to Fairchild Model 524 had one false alarm. intercommunication unit for remote turntables, but it may be used on The Allied alarm can be used with talkback at our main studios and one any unit that can be adjusted so that either 15 second, 1000 cps tone actua- is used as a 3 channel remote ampli- the table is uncoupled from the tion, AVC interruption, or both. We fier, as described below. motor and gear drive. The Fairchild discounted the former as it was often The drive motor, speaker, bias os- speed control knob operates through tripped by certain musical selections, cillator and controls were removed the center of the spindle on the turn- or static. Although not necessary, we and all unnecessary components dis- table. When pulled up, the turntable removed all parts not associated with carded. A small V.U. meter with a operates at 78 rpm, and when pushed AVC operation (deleted from sche- fixed +8 db multiplier was installed all the way down it rotates at 33% matic). The original no. 2 relay was in the speaker grille, and the volume rpm. Between the two positions the replaced by a more reliable 110V control with A.C. switch was also knob is in a "neutral" position, and relay. moved up to the speaker grille. An (Continued on page 106) Anti -fading Conelrad alarm circuit consists of modified AII'ed alarm amplifier, external buzzer and control room bulb 884 BUZZER KEY STATION AUDIO IN 2 MEG 51 M Ego /2 6 S N 7 BULB .75 MEG OWN 10M STATION E-1` 10 M ALARM 000 .-^f -f 000 RESET INPUT O 6. 3 o 115 V V o Lo RELAY 300V 12 M 2500 500 20 M 28 T 16 OFFICE a HALL SPEAKERS SET 5000 1L POT UNTIL 500 IL POT IS IN TRIPPING RANGE WHILE SLIGHTLY OVER MINIMUM AVC IS APPLIED THEN SET 50011_ POT (FINE CALIBRATION) SO RELAY WILL JUST HOLD WITH MAXIMUM FADE AVC. CHANGE OF .2 V. WILL TRIP RELAY. MAY REQUIRE SEVERAL ADJUSTMENTS AT FIRST. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 93 Behavior of Electronic Equipment Fig. 1: (I) Sketch of circular test road. Fig. 2: (r) Circular test road with vehicle installed Ruggedizing or shock mounting electronic equipment are prime considerations in as- suring operational reliability. Circular test -track affords means of checking effective- ness. Package tester used as laboratory simulation facility By G. K. GUTTWEIN, F. K. PRIEBE, and S. M. JEE* Signal Corps Engineering Laboratories, Fort Monmouth, N. J. MOBILE military equipment is dition in the laboratory. The objec- formance characteristics of a com- subjected to road irregularities tives of the test described are to mercial package tester, especially its and obstructions in the field. On measure the behavior of a military applicability for simulating road many occasions, the exigency of the wheeled vehicle, electronic compo- shocks. moment makes traversing rough road nents and equipment, and shock A. test road, called the Circular necessary. Consequently, failures of mounts under rough riding condi- Test Road, Coles Signal Laboratory, equipment and components may re- tions; and to investigate the per - SCEL, was used to simulate rough sult. The elimination of equipment riding conditions. Fig. 1 gives the MONITORING dimensions of the test road and the failures can be accomplished either C R.0 by ruggedizing the equipment or by location of the obstructions which consisted of 3 in. high chamfered isolating the road generated vibra- AMPEX RODS NIT BRUSH INE REPRODUCER BAND PASS RECORDING planks with 1/2 in. felt function as the tions and shocks. Ruggedization of 8 ANALYZER FILTER GALVANOMETER equipment is not always feasible be- noise abatement material as visible in Fig. 2. The test vehicle used was cause of functional requirements so LECTRONIC TUBE CORP CR.O POLAROID a 3/4 ton 4 x 4 truck; it was installed that the use of shock mounts is the CAMERA only other solution. The selection of similarly as the 1/4 ton 4 x 4 truck on the test course which is shown the proper mount is dependent on Fig. 5: Block diagram of equipment and 2. 3/4 knowledge of the damaging frequen- circuitry used for frequency analysis in Fig. The ton truck, a perma- cies. nent part of the test facility, is Supplying the designer with per- equipped with booms linked to the tinent data concerning the shock Fig. 6: Filter transmission characteristic center piece where slip rings are sources is the first step of a logical located. Provisions are made so that Transml slon Charo ten tic db the vehicle can travel the course at approach toward eliminating trans- Band Pass FIIter portation damages. This information a constant speed (10 MPH for the subject tests) unattended. can be obtained through field tests 10 NOMINAL 3 of mounting in which samples of actual equip- PAS NANO Fig. shows the type ment are transported over rough 20 arrangement used for the electronic roads until failure occurs. Since this chassis. The chassis was fastened to 30 type of investigation is not always the mounting bracket which, in turn, was bolted onto the cargo space of practical for obvious reasons, it is w desirable to simulate the field con- the truck. The test chassis were chosen arbitrarily from the stock : A . B I Y B A 5 r *Mr. Jee is no longer with SCEL %ro pile; chassis of different weight and 94 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 in Vehicular Transportation Fig. 3: (1) Method of mounting electronic chassis. Fig. 4: (r) L.A.B. package tester size were used. During the test runs, Fig. 7: Curves provide frequency analysis of radio chassis no electronic tubes were mounted on acceleration of the the chassis. The OVERALL RESPONSE I-1000 CPS chassis and of the main truck frame was measured at various locations. 279 FRONT WHEELS In addition to the chassis, a com- equipment REAR WHEELS plete piece of electronic h[ I SECOND-H form of a meter tester was in the BANDWIDTH I-2 CPS tested with and without a transit 0.79 case. The inside package, measuring k--- I SECOND 11% x 16 x 9' c in., weighed 43 --- pounds. BANDWIDTH 2-4 CPS A L.A.B. Package Tester, Type 1.39 shown in Fig. 4, consti- 1000-D, as I SECOND -H laboratory simulation fa- tuted the BANDWIDTH 4-8 CPS cility, and an 80 pound backstop 9g was the only addition made to the factory model. The table vibrates F'--- 1 SECOND - with a circular motion in the vertical BANDWIDTH 8-16 CPS plane. The equipment to be tested 2.2q rests loose on the table. The vertical Vf motion of the table causes the equip- I SECOND and at least k ment to bounce up down BANDWIDTH 16-32 CPS once during each revolution. Two table speeds, 240 and 285 rpm, were used for the test. k -I SECOND-. BANDWIDTH 32-64 CPS lnxlrumvnlat7on Barium titanate accelerometers, Gulton type A410, were used for 1 SECOND BANDWIDTH 64-128 CPS measuring the accelerations at vari- I I.Sg ous locations. The accelerometers were connected to an eight channel Ampex tape recorder, especially de- signed and built for shock and vi- - I SECOND BANDWIDTH 128-256 CPS bration work. The overall system 3't9 consisting of accelerometer, recorder 1 M ilr and reproducer has a frequency SECOND -- characteristic which covers the BANDWIDTH 256-500 CPS 0.79 range from 1 cps to 1000 cps. The method of recording the shock and I.-- I SECOND vibration phenomena under investi- BANDWIDTH 500-1000 CPS gation on magnetic tape has the ad- 3.09 vantage that the tapes can be repro- F5-- I SECOND-/ duced many times in the laboratory and the evaluation and analysis of TELE -TECH & ELECTRONIC INDUSTRIES December 1954 95 24 13 Acceleration vs. Frequency Acceleration vs. Frequency 1 12 mounting frame characteristics. 22 - Radio Chassis \ - Chassis rn 11 All accelerometers oriented vertically oriented vertically - 20 - All accelerometers \ o, frame bolted to truck floor. CHASSIS FASTENED TO FRAME OVER \ 10 18 / - REAR AXLE RIGHT - 18 9 FRAME, OVER REAR AXLE, RIGHT- 16 p Ó O 9 CHASSIS FASTENED TO FRAME 16 - o / \ x FRAME (CROSS MEMBER), CENTER FRONT LEFT 27g / ¢ LONGITUDINAL AXIS, REAR - 13 p ¢ w e - t`j 14 A CHASSIS FASTENED TO FRAME \ J o FRAME, OVER REAR AXLE, LEFT -17g - / w -oar.e U REAR, RIGHT 23 p / \ U - 12 A FRAME (CROSS MEMBER) CENTER - __LOOSE CHASSIS WITH 5 LB'S 6 - LONGITUDINAL AXIS, FRONT - 17g RIGHT 409 / WEIGHT, REAR 10 á 5 8 O 4 , 6 3 x"--at`ì1T á 2 , ,_,_ , 2 ....,/ ,,, _ .... _,... , I `, I I i I , ., ,, ..., ,. o o .__. 10 100 10 1000 FREQUENCY - cps FREQUENCY - CpS Fig. 8: (I) Acceleration spectrum of radio chassis during test. Fig. 9: (r) Acceleration spectrum of mounting frame during test 13 Accelere^ian vs Frequency iz ^ Equipm , n mourn vehicle (Continued) Vehicular Transportation m ,i - ne' NT X SNOOK...pgFTEg - --- i CASE eMTRT MIrNOqr ( pass band of the filter because of - TRANSI CASE the recorded signals can be per- ! 1 means. the magnitude of accelerations in- formed by electrical r \ 5 of the volved. This is caused by the trans- .1 Fig. gives a block diagram , `. of band \ equipment which was used to make mission characteristic the , , ` , a frequency analysis. The output pass filter as explained before. . signal of the Ampex reproducer was Figs. 8 to 12 present the accelera- connected to a Krohn -Hite band- tion spectra of radio chassis (fas- 10 loose), and of equipment FREIMAN r cps pass filter which has an adjustable tened and Fig. 10: Spectrum of equipment on mov- pass band. By playing back the same on a moving vehicle and on the ing vehicle with and without transit case piece of tape repeatedly and chang- package tester. The overall "g" lev- ing the setting of the filter each time, els which were obtained without fil- be done by dividing the chassis into one obtains on the ink recording gal- tering are noted in the legend. The compartments to lessen resonance vanometer the signal amplitude for measurements were made with the effects or by providing damping for different frequency ranges as deter- ink recording oscillograph. All the resonances by using a soft metal mined by the setting of the filter. curves were obtained by evaluating for the chassis. The transmission characteristic of the frequency analysis charts which is Fig. 6 for a pass look similar to that shown in Fig. 7. the filter given in Curve band one octave wide; this octave In Figs. 8 to 12, the peak to peak Acceleration band was always used for making accelerations which can be read The acceleration curve for the the frequency analysis. As can be from the frequency analysis charts loose chassis (Fig. 8) is different seen from Fig. 6, the filter character- for each band of the filter were from those of the fastened chassis. istic is not rectangular as could be plotted versus the center frequency Since the loose chassis, which was expected from an ideal filter. Within of this pass band. unsymetrically loaded with 5 pounds, the nominal pass band, the attenua- Fig. 8 shows the acceleration spec- was free to bounce up and down, tion never exceeds 3 db; outside trum encountered by various radio thereby hitting the metal frame, this band the attenuation increases chassis in different locations of the high shock forces are excited in that gradually and finally reaches a slope truck, whereas Fig. 9 gives the ac- chassis which account for the high of 23 db/octave. This characteristic celerations which were measured on g values at frequencies above 100 makes it possible that very strong the mounting frame itself. Inspec- cps. signals outside the pass band can tion of Fig. 8 and comparison with Fig. 10 shows that the rail type show an appreciable output within Fig. 9 reveals that the fastened chas- shock mounts, together with the the range of the filter. sis themselves act as mechanical transit case in which they were used, filters. Because of their undamped provide protection against shock. The Data and Results natural resonant frequencies, they overall acceleration applied to the suppress the higher exciting fre- electronic equipment dropped from Fig. 7 pictures the frequency an- quencies and amplify the lower ones 21 g to 11 g. The frequency distribu- alysis of a tie -down radio chassis in so that the frequencies of maximum tion, however, has changed. Above the left front cargo space, while the acceleration-which appear in Fig. 150 cps, the acceleration decreases, truck is traveling over an obstruc- 9 always above 100 cps-are shifted but in the region from 4 cps to 150 tion on the Circular Test Road. Note downwards and are found below 70 cps the shocks are amplified. The that the natural frequency of the cps in Fig. 8. The high -Q resonances reason for this behavior is the filter fastened chassis is found to be 49 which occur in the chassis-for ex- action of the shock mounts and of cps, and that higher frequencies of ample, the 49 cps peak shown in Fig. the transit case, which is similar to any significant magnitude are ab- 7-cause a considerable amplifica- that discussed before for the elec- sent. The chassis has very little in- tion of the exciting acceleration. tronic chassis. ternal damping, and its natural fre- Care should be exercised, therefore, The package tester has proven it - quency appears even outside the to avoid such amplification. This can (Continued on page 138) 96 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 How to Prepare Printed Circuit Artwork Practical techniques and precautions to insure accuracy. used by the printed circuit darkroom crew (see Fig. 2) is made to be ab- What every design engineer and draftsman should know solutely distortion -free. Any and all dimensions will be reduced by the exact same ratio. To assure a maxi- By JACK BAY HA, Director mum accuracy always be sure to Benton Laboratories BROWN PAPER supply the one allowable dimension Twin. Cities Airport in the longest place possible. (See Benton Harbor, Mich. TRRC/NG PAPER Fig. 3.) This will result in the great- est overall accuracy. Reduction size is generally measured with a scale THE first thing to bear in mind in on the ground glass of the camera, RUBBER the preparation of a piece of art CEMENT and errors of 0.010 in the measured work for a printed circuit is that the size may be expected. Naturally finished circuit can never be any /ILSTRAT/ON) 0.010 in 10 in. means a more ac- better than your original drawing. BOARD curate circuit than if the error were Any errors, sloppy drafting, under - taken in only 2 in. inking, or other defects will appear Do not dimension art by merely with the same faithful reproduction Fig. 1: Protecting original artwork saying "4 x size" etc. Give one di- as the parts of the circuit drawn. mension to be held, and as accurately There are a number of pitfalls to and they are difficult to retouch out as you have drawn it, it will be re- avoid, and placing these at the head from printing negatives. Be very produced. of our list, we will attempt to make careful when erasing that you do not All printed circuit production en- your next circuit a better one. "gray out" lines, or if you do, re -ink gineers know the shortcomings of All work starts off with photog- them to be sure you have a good, jet (Continued on page 143) raphy of your original art with a black, ink job. process camera. Dirty art work does not always reveal itself until it is Sharp Lines placed before the all -seeing eye of this camera. The extreme resolving Nothing can cause a worse look- power of the lens used, coupled with ing circuit board than fuzzy lines in the type of film employed, causes your art work. They can be avoided even the slightest speck of dust to best by using a top quality, sharp photograph. When cameras are on ruling pen, for all outlining, and if the premises this causes no great de- you do not use grille systems (to be lay-art can be cleaned up, and a explained), use a top grade of artists new shot taken-but many com- illustration board of a type intended panies do not have their own cam- for use with ink. Here we can rec- eras, and extensive delays are caused ommend Strathmore as being a high by the need for rephotographing a quality product. If you use tracing particularly dirty piece of copy. paper-tracing cloth is not recom- Much can be cured by retouching, mended-be sure to use a grade in- but it is best to cover art work with tended for use with ink, and on a clean sheet of tracing paper as completion securely mount the trac- soon as the drawing is completed. ing paper to a sheet of cardboard by Simply fasten the paper to the back holding the corners with drafting of the art with rubber cement, and tape. Do not cement it to the card- fold it over the front. See Fig. 1. board as almost all adhesives cause odd effects when the art is photo- Dark Lines graphed. Leave the mounting to the printed circuit darkroom personnel. All too often we find art sent to us Fig. 2: Printed circuit distortionless camera for production purposes with lightly Accuracy inked lines. These have a tendency Fig. 3: Method of marking dimensions on art to reproduce weakly, and poorly The printed circuit engineer in the etched ehd products will result, un- manufacturer's plant gets very irked less these lines are retouched. This at the engineers who prepare art problem can best be controlled by work, labelling one dimension as is using only a first quality ink, such required and expecting some miracle LIGHT BLUE LINES as Higgins, for all inking work. Here of photography to alter another di- DIMENSION LONG SIDE it is important to note that small mension other than to exact scale. 1 white openings left in inked areas While some forms of photography REDUCE ros% cause pin holes in finished pieces, are capable of distortion, the camera TELE -TECH & ELECTRONIC INDUSTRIES December 1954 97 (I) Cutting a 24 -pitch thread on inside wall of glass tubing having ID of I/2 in., using right angle nozzle with 0.006 x 0.06 in. rectangular orifice. Similar helixes have been cut in ceramic tubing with 0.17 ID. (r) Frilling deptessiion ir quartz disc. Hole is 0.03 in. dia., 0.015 in. deep. By ROBERT R. GRETTER S. S. White Industrial Div. 10 East 40 Street New Abrasive Process New York 16, N.Y. THE principle of removing or cut- High-speed gas -propelled abrasives cut hard materials ting materials by means of ab- rasion or "sand blasting" has been on skin tissue. Applications include printed circuits, known and used by manufacturers for many years. But it has been only recently, with the development of an improved process, called "Airbra- The size and shape of the nozzle sive material is contained in a spe- sive" that the technique has been orifice is determined by the job to be cial mixing chamber mounted on a refined sufficiently to allow it to be performed. Standard orifices include vibrating unit. The action of the vi- used to perform relatively delicate an 0.018 -in. diameter round orifice brator controls the richness of the operations on small electronic com- and an 0.006 -in. x 0.060-in. rectan- abrasive mixture. By varying the ponents gular orifice. With the rectangular impressed voltage across the vibrat- orifice, it is possible to cut lines as ing unit, the flow of abrasive into Cutting Action fine as 0.007 -in. in hard, brittle ma- the gas stream can be accurately terials. proportioned to provide the correct This improved process utilizes a cutting speed for the particular job high-speed %gas -propelled stream of Abrasive being performed. finely graded abrasive particles for Further control of the cutting its cutting effect. The stream, which Ordinarily, the abrasive material speed can be accomplished by regu- is directed at the work through a employed is aluminum oxide. How- lating the distance of the nozzle tip small orifice nozzle, travels at a ever, for certain applications a from the work and by changing the speed of about 1100 ft/sec. The lighter abrasive which is a mixture gas pressure. Ordinarily, however, a kinetic .energy thus produced, plus of magnesium and calcium carbon- fixed gas pressure of 75 psi is used the expansion of the propellant gas, ates has been found to be more suit- behind the nozzle. produces a cool and rapid cutting able. A close particle size range of action. 27 microns is maintained. The abra - Adavaattages Typical applications of abrasive process are (I to r) quartz disc with pinpoint contact de- One of the chief advantages of pressions, ground glass tubing with thread, and carbon film resistor with spiral grove this process is its ability to remove material without the increase in temperature and without the vibra- tion and pressure usually associated with other cutting methods. This is especially desirable when cutting thin crystals which have a marked tendency to shatter when subjected to undue shocks and pressure. Another advantageous feature of the process is that each grain of ab- rasive contacts the work just once. In this way the full cutting effect of the abrasive material is realized, and the cutting is more uniform than might be expected with ordinary cutting tools which tend to lose their sharp edges with repeated use. In addition, since the abrading can be accomplished without exerting pressure, surface irregularities in the work will not cause the "skips" and "jumps" that often occur when (I) Cutting a continuous spiral groove in a deposited carbon film resistor, using a straight nozzle with 0.006 x 0.06 in. rectangular orifice. Cut width is 0.007 in. (r) Cutting and shaping cylindrical crystals used in neutron diffraction. Sizes are as small as fraction of mm dia., and 1.5 cm long Speeds Component Production and remove deposited surface coatings. Has no effect in rate of solution or hardness with crystallographic direction, the prep- crystals, resistors, germanium and many others aration of the crystals presented a difficult problem, since ordinary cut- ting or grinding operations would tend to fracture the crystals. a rotary contact tool is used. readily solved by the process. Gen- This process proved to be a handy The unique production possibili- erally, the resistor body, completely solution to these difficulties. In ac- ties of the "Airbrasive" process has coated, is held in a lathe or similar tual application, the abrasive stream led to its expanding use by elec- device and rotated at a predeter- is first used manually to cut and tronic engineers in the production mined speed. The nozzle, mounted in shape the crystals in rough form. of components and for handling a traveling tool holder, is set at a Then, the crystal section is mounted many difficult cutting and abrading specified distance from the resistor. in a standard goniometer head and jobs. The film is then removed automati- aligned optically or by X-ray. Once cally. Uniform lines as fine as 0.007 - this has been done, the goniometer Cutting Germanium in. can be obtained in this manner. head is placed in a small lathe and With proper regulation, only the slowly rotated in front of the abra- An early application for the pro- surface coating is removed without sive stream. The process assures the cess was in the cutting of thin sec- effect on the resistor body. tions of germanium, one of the rare production of cylinders of extremely fine and accurate circular cross-sec- earth minerals used in transistors. Meaning Fragile Crystals The process proved to be highly suc- tion. cessful for this purpose because it Another interesting application In the production and design of eliminated the possibility of shatter- involves the cutting and shaping of electronic devices, the "Airbrasive" ing or chipping the material. fragile crystals for neutron diffrac- process has provided a method of tion studies. Usually, these studies doing many jobs that were either Printed I'ireuits require cylindrical crystals several impractical or impossible to do by mm in diameter and about 1.5 cm in previously known methods. For the Most printing systems for resistor length. In the past, especially where most part, the majority of applica - manufacture employed today are un- crystals showed marked inequalities (Continued on page 145) able to mass produce resistive units to the close tolerances needed for Manual operation of electrically controlled "Airbrasive" unit using gas propellant electronic circuitry. To raise the re- sistance values to the desired degree, the "Airbrasive" process is now be- ing employed as a means of remov- ing the resistor material. In this type of application, the "Airbrasive" stream is directed at a part on the circuit at an acute angle. Control over the amount of resistor material removed can be obtained by limit bridges which automatically stop the flow of abrasive once the desired values are obtained. For resistors now lower than 60( below toler- ance, the "trimming" can be accom- plished in 8 seconds or less. (TELE - TECH, Sept. 1953, p. 78.) The problem of cutting helical grooves in carbon film resistors is TELE -TECH & ELECTRONIC INDUSTRIES December 1954 99 New Printed Circuit PULSE TRANSFORMERS PRINTED AMPLIFIER MORE TECHNICAL INFORMATION The new series, Type GEM, miniature A new encapsulated, high -tempera- describing the new products presented resistance coupled, subminiature, plug-in pulse transformers for printed writing on ture here may be obtained by silicon transistor servo -amplifier for circuitry is available in the pulse width company letterhead to New Products 2 airborne and guided missile applica- range from 0.05 to µsecs-with two or Editor, TELE -TECH & ELECTRONIC tions, features printed wiring and re- three windings. The units are "Epoxy" INDUSTRIES, 480 Lexington Ave., New York 17, N.Y., listing numbers given at end of each item of interest. Please mention title of position held. ADHESIVE FOIL P 195, a new adhesive coated copper foil for printed circuits has a heat re- sistance after cure to solder of 410°F. for 10 seconds, which betters NEMA standards. P 195 is a 1 -oz. electrolytic copper foil coated with a thermosetting adhesive in dry film form that can be laminated to steel, brass, bronze, alu- minum, wood, and phenolics. Sets at a glue line temperature of 325 to 350°F. resin impregnated and molded. Operat- for a period of 10 to 20 minutes. Pres- sistors. The printed unit is now available ing temperature range is from -70°C. to sure required for lamination is from in sample quantities with solder ter- 135°C. The transformers surpass MIL- 100 to 2,000 psi. Permacel Tape Corp., minals, or as a plug-in device. Size, T -27, Grade 1, Class A specifications. U.S. Highway No. 1, New Brunswick, x 1 x 2 in. Weight, less than 1/2 oz. Input Size, 544 in. diam. by A in. high. Weight, N.J.-TELE-TECH & ELECTRONIC impedance, 400 to 1,200 ohms; output approximately 5 grams. Terminals are INDUSTRIES. (Ask for 12-18) impedance, 120 to 2,000 ohms. Power 22 AWG copper wire. Maximum length output, 73 mw. Sensitivity, 500µv. Power in. Hi -pot test, 2,000 v. RMS. Gude- PRINTED CONNECTORS source, 28 v. dc. Plastics & Electronics man Co. of California, Inc., 9200 Ex- Corp., 272 Northland Ave., Buffalo 8, for position Blvd., Los Angeles 34, Calif. The "KKM" series connectors N.Y.-TELE;-TECH & ELECTRONIC -TELE -TECH & ELECTRONIC IN- plug-in printed circuit card applications INDUSTRIES. (Ask for 12-23) DUSTRIES. (Ask for 12-17) are available in sizes ranging from 6 to 22 contact positions. Spring temper phosphor bronze contacts are offered in DECADE TOTALIZER SILICONE The TU -100P decade totalizer, de- The dielectric capacities of silicones signed for use where a large number are made more useful packaged in an of pulsations are counted and recorded, aerosal container and used as a spray. employs a new printed circuit to "SP -2," the new product, provides ad- contribute greater operation stability. ditional insulative protection to elec- Greater heat dissipation results from tronic equipment -particularly, equip- better physical layout enabled by the ment that is subjected to high altitudes, circuit. The unit automatically records humidity, and marine atmospheres. The pulses separated by only 5 µsecs. No U. S. Signal Corps uses "SP -2" to pre- voltage regulation is required. Instant vent corrosion in exposed circuits. The resetting is accomplished externally. two terminal styles; (1) a slotted eyelet for soldering up to three No. 20 AWG cable wires per contact (2) a plain terminal to permit wire wrapping by the Western Electric Co. "Wire -Wrap" tool. Contact mv. drop is 10.5 dc at 3 amps rated current. Gold plating over silver provides low electrical resistance, cor- rosion prevention, and soldering ease. Winchester Electronics, Inc., Willard Rd., Norwalk, Conn.-TELE-TECH & Has a direct -reading illuminated dial ELECTRONIC INDUSTRIES. (Ask for material also eliminates short circuits with constant frequency rate to 100 kc. 12-19) due to moisture leakage paths. Product Size 1% x 51/2 x 51/2 in. Computer - is available in bulk -gals. and bbls. Measurement Div., Detectron Corp., Industrial Div. of Silatone Products 92, Dunellen, N.J.-TELE- 5420 Vineland Ave., North Hollywood, More New Products Corp., Box Calif.-TELE-TECH & ELECTRONIC TECH & ELECTRONIC INDUSTRIES. INDUSTRIES. (Ask for 12-3) Appear On Pages 102 & 110 (Ask for 12-24) 100 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Components & Equipment LABORATORY KIT MICA COMPONENTS WAFER SOCKETS The S31 basic laboratory kit consists Printed circuit components, molded of A recently designed laminated tube of six electrically conductive silver glass -bonded mica with a continuous socket for printed circuit application coatings, six resistance coatings, six operating temperature limit of 650°F, utilizes twin wafers that support con- accessory chemicals, manuals, data fold- are designed to tie in with the circuit tacts with vertical terminals. The termi- ers, etc. Quantities of materials range and meet the user's precise specifica- nals snap into holes in the circuit panel, tions. The units feature molded -in in- which enables printing jumpers to con- from 1 oz. to 1 pint. It is said that the serts. The coefficient of thermal expan- nect different pin positions. Static load materials are most effective in solving sion of the components is close enough tests indicate that, when properly dip - research and design problems in various to that of most inserts to hold them tight soldered in a multiple hole pattern in a industries. Though conductive coatings over the operating ranges. The glass - printed wiring panel, the socket will usually are used in electrical or elec- bonded mica (Mycalex 410) from which withstand a force of 10 times normal tronic components, they are used also the components are molded is struc- tube withdrawal force. Available in 7 in biochemistry, petroleum exploration, turally rigid and holds its hardware in or 9 pin types. Methode Mfg. Corp., 2021 air conditioning, ceramics, acoustics, and true alignment. Mycalex Corp. of Amer- W. Churchill, Chicago, Ill.-TELE- the automotive and aircraft fields. Micro - ica, 60 Clifton Blvd., Clifton, N.J.- TECH & ELECTRONIC INDUSTRIES. Circuits Co., New Buffalo, Mich.- TELE-TECH & ELECTRONIC INDUS- (Ask for 12-27) TELE-TECH & ELECTRONIC INDUS- TRIES. (Ask for 12-26) TRIES. (Ask for 12-20) TRANSMISSION DEVICE POT PRINTED ASSEMBLIES HEATING A new angular data transmission de- The production system of the "Placir" A new printed circuit process enables vice, called the "Inductosyn", is a multi - chassis eliminates the maze of wiring the maintenance of continuity from one pole synchro element which can serve usually involved in the electronic chas- side of insulating material to the op- as a shaft position data transmitter or sis. In it, the individual wiring leads posite side (without visible holes or receiver of great accuracy. Only 3 in. and wiring are produced as a single unit hardware) by electroplating copper for in diameter, the unit achieves an an- by a patented plating process applied to a time to close pre -punched sufficient gular accuracy by electronic means a phenolic base. A special controlled holes. Various over-platings can be sup- equal to that of a precision mechanical temperature heating pot has been de- plied, such as nickel -rhodium or electro - dividing head or rotary table 3 to 6 veloped as part of a five -step servicing solder deposits, with a finished surface times as large. The data elements are for removing and replacing defec- enables commutator brushes or plan that inductive in nature with the conductors tive parts. Part removal is accomplished being formed by photo -etched patterns by heating all the terminals of the corn- on glass plates. Farrand Optical Co., Bronx Blvd. & East 238th St., New York 70, N.Y.-TELE-TECH & ELECTRONIC INDUSTRIES. (Ask for 12-25) BINARY CODE DISCS Four versions of the binary code disc for use in photoelectric, magnetic, or contact types of pickups are available with digital code wheel patterns on polished glass. Discs contain concentric zones of information in the gray code. Each zone has alternating opaque and clear angular sectors. Thin, opaque, an- nular rings separate adjacent zones. Total metal thickness is approximately switching contacts to ride over it with- 0.001 in. Opaque portion density to ponent simultaneously. Following rec- out bounce. The method is used in transmitted light is over 2.5. Transparent ommended procedure, enables removal assemblies ranging from radio sets to areas are bare, optically -polished glass of every chassis component without complex analog computers. Insulated without emuls-on. W. & L. E. Gurley, lifting the wiring pattern. Motorola Inc., Circuits Inc., 115 Roosevelt Ave., Belle- Industrial Div., Troy, N.Y.-TELE- 4545 W. Augusta Blvd., Chicago 51, Ill. ville, N.J.-TELE-TECH & ELEC- TECH & ELECTRONIC INDUSTRIES. -TELE -TECH & ELECTRONIC IN- TRONIC INDUSTRIES. (Ask for 12-22) (Ask for 12-21) DUSTRIES. (Ask for 12-28) TELE -TECH & ELECTRONIC INDUSTRIES December 1954 101 Survey of New Products of the Month Capsule summaries of latest electronic developments provide handy reference for engineers in the marker for new equipment and components TUBE HOLDERS. Vertical subminiature tube Broadcast Equipment holders of irridite-dipped cadmium plated spring steel made by Atlas E -E Corp., Bed- Materials ford Airport, Bedford, Mass., hold up to 5 TURNTABLE LINE. "Rondine Jr.", third of G's vibration at 500 cos. For 0.375 and 0.500 SILICONE RUBBER GUM, SE -30, an- the 12 -in. turntables produced by Rek-O- diam. (Ask for A-12-3) nounced by General Electric Company, Sili- Kut Co., 38-01 Queens Blvd., Long Island ROTARY SWITCHES. "12000 cone Products Dept., Pittsfield, Mass., is a City 1, N. Y., differs from two other line The new new, low -shrinkage gum being used in com- in it is designed for 33 1/3 and 45 Series" oval ceramic switches by Shallcross pounds for units that Manufacturing Co., 10 Jackson Ave., Col- conventional molding, extrusion, rpm only. (Ask for A-12-1) lingdale, Pa. are available in shorting types calendering, coating, etc. (Ask for A-12-7) STUDIO SWITCHER for color TV broadcast with 20° or 30° indexing or non -shorting PLASTIC IMPREGNANT, designated "Sty - service, announced by Engineering Products types with 40 or 60 indexing. (Write for cast 62" by Emerson & Cuming, Inc., 869 Div., Radio Corp. of America, Camden, N. J., No. A-12-19) Washington St., Canton, Mass., is a low is designed to handle camera switching, fad- viscosity liquid for capacitors, filters, and in AC CIRCUIT CONTROL RELAY, designated ing, and lap -dissolves the studio control Part No. 9100, made by Leach Relay Co., Div. r -f coils. Cured as a solid plastic its dielectric room; also signal inputs. (Ask for A-12-17) constant is 60 to 108 cps-2.6 (Ask for of Leach Corp., 5915 Avalon Blvd., Los An- A-12-15) DEVELOPING MACHINE. "Bridgematic" geles 3, Calif. has insulation, spacing, and Model R -TV by S.O.S. Cinema Supply Co., contact life that exceeds UL requirements. COATING. "Rub-R-Ize," a liquid natural 602 W. 52nd St., New York 19, N. Y., op- 3 x 3', x 21 in. in size. Weighs 14 ozs. Coils rubber applied like paint to insulate, water- erates at about 100 degrees speeded up to 85 6 to 230 v ac. (Ask for A-12-31) proof, absorb sound, and prevent corrosion. ft./min; 400 ft magazine takes loading spools Withstands temperature -20 to +220°. Rub- right from camera. Film dries in few secs. ber Magic Inc., 4312 3rd Ave., Brooklyn, (Ask for A-12-36) Electronic Equipment N. Y. (Ask for A-12-32) 16 mm. FILM STRIPER announced by LAMINATED PLASTIC, "Gravoflex," an- Reeves Soundcraft Corp., 10 E. 52nd St., New WIRE MARKING MACHINES by Kingsley nounced by Hermes Plastics, Inc., 13-19 Uni- York, N. Y.. is identical in every important Stamping Machine Co., 1606 Cahuenga Blvd., versity Place. N. Y. can be bent by hand to feature with the 35 mm. "Magna -Striper." Hollywood 28, Calif., stamp the code or cir- any shape without breaking. Scratchproof Applies magnetic oxide in any of three cuit number onto the wire insulation. Elimi- and stainproof. Sheets, strips, 1/32, 1/16, U3 widths -50, 100, 25 mil.-to 16 mm. film. (Ask nate need for multiple inventories of color - in. thick. (Ask for A-12-35) for A-12-27) coded wire, tags, etc. (Ask for A-12-2) OUTPUT AMPLIFIER by Peer Inc., 1200 DECADE LOCALIZER, TU -100P, by Com- Milton St., Benton Harbor, Mich., when used puter -Measurements Div., Detectron Corp.. Power Supplies as a microphone amplifier to feed a radio North Hollywood, Calif., employs printed transmitter, it is claimed, provides an aver- circuitry to reduce cost and achieve greater GENERATOR. Model 51SB, single sideband age of 95% modulation utilization without resistance. Records pulses separated by only generator designed for operation with the over -modulation. (Ask for A-12-12) 5 µsec. (Ask for A-12-33) Model 5100 transmitter by Barker & Wil- MAGNETIC AMPLIFIER, Model MA65 an- liamson, Inc., 237 Fairfield Ave., Upper nounced by Sorensen & Co., Inc., 375 Fair- Darby, Pa., is self contained. Needs only a Coils & Condensers field Ave., Stamford, Conn. is tube'ess and microphone. (Ask for A-12-30) designed for telephone and telegraph sys- POWER SUPPLY, Model No. 200D-2, out- FLYBACK TRANSFORMERS. Three new tems, radio, and TV. Input, 105-125 VAC, put voltage is varied from 100 to 2,000 v in flyback transformers designed for Admiral single phase, 60 cps. (Ask for A-12-5) 10 -volt calibrated steps. Potentiometer varied receivers, and two units for Emerson receiv- between steps. Output current, 20 ma. Kalb- INDUCTION HEATER, Model 10,000 made fell Laboratories, Inc., P. O. Box 1578, 1090 ers have been added to the TV replacement by Radio Co., 44 Med- line of Triad Transformer Corporation, 4055 Frequency Park St., Morena Blvd. San Diego 10, Calif. (Write for field, Mass., is fast enough to heat a % in. No. A-12-20) Redwood Ave., Venice, Calif. (Ask for titanium rod to 3,400° F. in 9 secs. Solder- A-12-22) ing, welding, and annealing of common SELENIUM RECTIFIERS. Two cartridge CAPACITOR. The "Glassmike" TSG capaci- metals accomplished in fractional secs. (Ask type selenium rectifiers, Types U45HP and tor is for use in aircraft radio and radar for A-12-28) U5OHPF, have been developed by Interna- tional Rectifier Corp., 1521 E. Grand Ave., equipment. Produced in 29 ratings and sizes. NOISE FILTER, a new miniature molded Smallest is a 0.0004 of unit with 6,000 effec- ra- El Segundo, Calif., for use as high voltage dio unit designed by The Potter Co., 1950 N. power supplies -2 and 1% in. long. (Ask for tive working volts rated 2 amps at 1 MC. Sheridan Rd., N. Chicago, Ill., to fit a small A-12-4) Condenser Products Co.. Div of New Haven motor and gear assembly, reduces overall Clock & Watch Co., 140 Hamilton St., New length of a conventional filter about 50%. POWER SUPPLY, No. MR2430-100X, an- Haven, Conn. (Write for No. A-12-37) (Ask for A-12-26) nounced by Perkin Engineering Corp., 345 TOROIDS. Dietz Design and Manufacturing Kansas St., El Segundo, Calif., is a 28 v. 100 Mo., a PLAYERS AND RECORDERS. Magnetic tape amp regulated magnetic amplifier. The tube- Co. Grandview, has announced new players and recorders, by International In- less unit is 25 x 15 x 15 in. in size. DC output, line of encapsulated toroids with guaranteed dustries Corp., Dept. KP, 3101 E. 42nd St.. 24-30 v at 100 amps. (Ask for A-12-8) accuracies as great as 0.10% or 1 turn of Minneapolis 6, Minn., employ the "Isimetric" winding where required. Hermetic sealing drive to tape handling without fric- RECTIFIER TUBE, NL -633, rated at 30 amp. meets MIL -T-27. (Ask for A-12-29) operate do and 225 amp. peak, is a new bracket tional clutches or brakes. (Ask for A-12-13) mounting mercury-vapor rectifier made by TRANSMITTER -RECEIVER announced by National Electronics Inc., Geneva, ni. that is Electronic Components General Electric Co., Electronics Park, Syra- adaptable to industrial applications. (Ask for cuse, N. Y., is a completely new 25 w. mo- A-12-9) bile combination that operates in the 152-174 LIGHTNING ARRESTER, is designed for MC band. Designed to work interchange- maximum transmission of r -f energy in the ably from 6 or 12 v. battery. (Ask for Resistive Devices 2-24 MC band. Will divert up to six light- A-12-10) ning impulses. Made by Airtron, Inc., 1103 \V. Elizabeth Ave., Linden, N. J., to protect MACH NUMBER COMPUTER, CA -500, re- POTENTIOMETER, precision Series 42-900, aircraft communication gear. (Ask for quires no vacuum tubes. Made by Servo- is stocked for immediate delivery by Claro- A-12-6) mechanisms, Inc., El Segundo, Div., 316 stat Mfg. Co., Dover, N. H. Design based on Washington St., El Segundo, Calif., the that of Series 42. Resistance range from 50 JACK AND PLUG. A sub -miniature closed force -balance type unit provides accuracy to 100,000 ohms in 10 standard increments. circuit combination offered by Dept. KP, of 0.01 Mach for 95% of laboratory test (Ask for A-12-25) Telex, Inc., 1633 Eustis Ave.. St. Paul, Minn. points. (Write for No. A-12-38) Phone type, approximately 1/3 the size of DECADE RESISTANCE UNIT, "Geda," is a previous models; % in. length, 9/64 in. plug-in device for analog -computing equip- for A-12-23) ment, and special work in electrical labora- diam. (Ask MORE TECHNICAL INFORMATION tories. Four types have max. resistances of TRANSISTOR. A "super power" transistor describing the new products presented 1 and 10 megohm and 1 and 10 kilohms. that can deliver up to five amps of current may be on Length 4 in.; diam. 1? in. Dept. KP, Telex, to a motor has been added to the high - here obtained by writing Inc., E -A Div., Telex Park, St. Paul, Minn. output transistor line made by Minneapolis - company letterhead to New Products (Write for No. A-12-39) 2753 S. Honeywell Regulator Co., 4th Ave., Editor, TELE -TECH & ELECTRONIC 2 eliminates Minneapolis 8, Minn. (Ask for A-12-24) CONTROL, Model "Snap -Tite" INDUSTRIES, 480 Lexington Ave., New all mounting hardware, tab twisting, and VARIABLE DELAY LINE, available at An- mounting tools. Pushed into the mounting derson Laboratories, Inc., 39 Talcott Rd. W. York 17, N.Y., listing numbers given at hole, the control simply snaps into place. Hartford, Conn., effects continuous variation end of each item of interest. Please Panels are gripped bysix spring clips. Cen- of delay time by rotary motion of a shaft. tralab, Div., Globe -Union Inc., 900 E. Keefe Variation can be as wide as 4 to 1 (10 to 40 mention title of position held. Av., Dept. F38, Milwaukee 1, Wis. (Write for µsecs). (Ask for A-12-18) No. A-12-40) 102 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 F' Centrally located plants at Chicago, Shelbyville, Indiana and St. Louis r. +F , ta 4, !', PRODUCES LOW LOSS MICA COMPONENTS IN QUANTITY.. ...QUICKLY Miniaturized Micro Connectors that save space, weigh less and are mare efficient ... 14, 21, 34 and 50 contacts avail- able in low loss material for chassis mounting applications. Cinch components available Adequate and unequaled at leading electronic jobbers facilities have advanced CINCH to -everywhere the foremost producer of low loss Mica components in production quantity. CONSULT CINCH! CINCH MANUFACTURING CORPORATION 1026 South Homan Ave., Chicago 24, Illinois Subsidiary of United -Carr Fastener Corporation, Cambridge, Mass Fig. 1: Makeup sheet of foil clad material consists of arranging laminate, adhesive (dry film in this instance) and copper foil in proper sequence. Adhesive must contact rough side of both laminate and foil for best possible bond. Fig. 2 (Right) Makeup for each sheet is sandwiched between clean smooth steel press plates. These assemblies are then stacked 5 ft. high (packs) for insertion in hydraulic presses On Copper -Clad Laminates SYNTHANE Corp., Oaks, Pa. re- ant properties, and for this, there is tween the foil and the laminate. ports: a flame-retardant additive which has Good adhesion is needed to insure In spite of the many different no important effect upon the elec- that the fragile pattern will adhere methods used to produce a func- trical properties of any specified during fabrication and during the tional printed circuit, each assembly grade of laminate. dip soldering of leads and compo- is developed on the same basic en- In practically all electronic appli- nents. gineering principle; the use of a cations surface resistivity, "Q" factor current -carrying medium bonded to and moisture absorption are of Aluminum FoU an insulating base. The electrical prime importance. Dielectric and properties of the finished product are power factors impose additional re- Most methods of circuit printing largely determined by the choice of quirements. An excellent example use copper foils as the current - base insulation, the selection of a of this is television. The tuner, audio carrying medium, although alumi- metal conductor and the type of ad- section, and the IF strip in a tele- num foils are becoming increasingly hesive used to bond the two. vision set must have good surface popular for several important rea- The most satisfactory printed cir- resistivity and "Q" properties cou- sons. Aluminum foil is more plenti- cuit dielectric or insulating materials pled with low moisture absorption, ful, more economical and also pos- developed thus far are thermosetting whereas the power supply requires sesses superior bonding qualities. In laminated plastics. Tests have shown addition, it can be etched in a frac- that any of the twenty -odd standard tion of the time required for copper. NEMA grades will produce a satis- The most serious disadvantage of factory bond with copper, however, aluminum to date has been the ne- NEM4 grade XXXP-IR is usually cessity for special surface prepara- recommended. This grade utilizes a tion to permit soldering. This char- paper filler and is produced, by im- acteristic, however, can sometimes or coating the filler ma- be used to advantage since the prep- pregnating from terial with a thermosetting resin and aration may easily be stripped consolidating a predetermined num- sections where soldering is not re- ber of layers using heat and high quired. This permits spot -soldering pressure. The ensuing chemical re- during a normal dip -soldering op- action transforms the layers into a eration. hard, dense solid which will not de - Production of the combination ma- laminate and cannot be resoftened terial which ultimately becomes a by additional applications of heat. printed circuit begins with the pur- chase of foils in thicknesses ranging Even in thin sheets, XXXP-IR com- Fig. 3: Operator loads packs In 10 opening 0.00135 -in. to 0.0027 -in. This bines excellent electrical properties press. After one hour at 350° F and 1000 from with the good machinability so nec- Ibs/sq. In. foil and laminate are bonded roll material is cut into squares essary for punching operations. In slightly larger than 36 -in. x 36 -in. addition, this laminate is sufficiently a good power factor and dielectric sheet stock. Since cleanliness is of hard to maintain a smooth surface constant. the utmost importance in securing a after the metal foil has been bonded. The various printing and etching satisfactory bond between foil and other than phenolics, processes also present a special set laminate, foil must be thoroughly Laminates to such as melamine and silicone may of difficulties. Numerous coatings, washed in an ammonia solution also be used. Melamine resins are solvents, salt and acid baths, pumic- remove applied coatings and foreign used where arc resistance is an im- ing, and rapid temperature changes matter. portant factor, and silicone resins cannot help but have an effect upon Choice of adhesive is particularly are used when heat resistance is re- surface resistivity since the base ma- important. Of the many types of terial will inevitably retain a small commercial compounds and films quired. few In some special instances, Under- percentage of salts. available, only a comparatively writers' Laboratory insists upon the There is also the difficulty of ob- are suitable for use with foil -clad base laminate having flame-retard- taining a strong, uniform bond be- (Continued on page 112) 104 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 RADAR A NEW TEL TER STANDARD MORE VERSATILE SMALLER MORE RELIABLE LESS INPUT POWER SONAR Tature SnaDsl Fas -e ctors tput Dust Proof ators ting HYDRAULICS Ys Dust S ed 'try Regulator Low-pass Fi TELEMETERIN6 Pickup Excitatio n ators BENDIX- $TATP-4&5 CKAGES These compact Bendix-Pacific Telemeterin use with resistance type pickups. offer risers of telemetering systems a better means No vacuum tubes are required in mixing the out- to instrument such quantities as pressure, force, puts of the individual subcarrier oscillators to the temperature, voltage, acceleration and vibration. composite audio signal for direct modulation of the ELECTRO -MECHANICAL The units are smaller and various combinations RF transmitter, thus greatly improving the reliability may be used to provide compact multi -channel of the system at a point where a tube failure would systems of up to 18 subcarrier bands. Each unit affect all subcarrier channels. operates on unregulated +150 VDC and 28 VDC Standard Bendix Model TPP-6 Power Supplies are since it contains its own voltage regulating cir- available to handle from one to three of these teleme- cuits. Each unit may be provided with individual ter packages plus a 2 watt crystal controlled RF trans- relays for switching oscillator inputs from signal mitter. Many types of interchangeable subcarrier to calibrate position. Model TATP-4 contains four oscillators are also available. RF amplifiers are avail- and Model TATP-5 contains six separate and in- able for increased power outputs up to 100 watts. dependent regulated +5 VDC excitation voltage TYPICAL 10 BAND SYSTEM CHARACTERISTICS ULTRASONICS 2 Watts output TATP-4 TATP-5 215 235 MC. Nn of hands 4 6 Subcarrier 1.7 kc. to 70 kc. 1.7 kc. to 70.0 kc. hands TXV-13 TATP-4 TATP-5 Oscillator TOE -30V, TOE -31V, RF Same as TATP-4 Transmitter Tvoes ,JOR -8V. TOR -9V. TOL-9V Input 6, 12, or 24 VDC ±-10% 16, 12, or 24 VDC ±10% Voltages 150 VDC ±-12% 150 VDC +10 Weight (Less Approx.pprox. 2 lbs. Approx. 3 lbs. TPP-6 Power Dimensions 5.0" x 5.0" x 4.5" 5.0" x 7.5" x 4.5" Supply r Write for Complete Information Unregulated 24 30 VDC PACIFIC DIVISION Bendix Aviation Corporation 11610 Shermon Way, North Hollywood, California TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 105 CUES for BROADCASTERS 1IWSL (Continued from page 93) Epoxy Compound for GROUND DOWN RUBBER HOSE SPEED CHANGE "45" RECORD Brush Redheads CONTROL IN ADAPTER PLATE NEUTRAL POSITION WEIGHT DRIVE POINT _,111111111111111111.113111111111111111111111111111111111111111, SOFT RUBBER PADS TURNTABLE GLUED TO BOTTOM OF MOTOR Diagram showing 45 rpm conversion details to Fairchild 254 is uncoupled from the drive. be placed so that only the ground Now place another drive motor in down hose portion rests against the such a position that it drives the turntable, and all the ground por- Another application of HYSOL 6000 Se- turntable at 45 rpm. In our case we tion must be on that part of the hose ries Compounds, based on the new epoxy use a four pole motor of the type extending beyond the motor shaft. compounds, is the encapsulation for used on home recorder units. A piece The weight of the turntable gives Brush Electronics Company's BK -1090 mag- of rubber hose is placed on the extremely good speed regulation, netic record -reproduce heads. This "Red- motor shaft so that it drives the and there is no noticeable wow, head" has the standard track width de- turntable on the outer top of the rumble or hum pick-up from the signed for dual track recording on 1/4" turntable surface. The rubber hose extra motor. The total cost is well tape. is placed so that about 3/4 in. of hose below twenty dollars. The HYSOL 6000 cast resin construction protrudes beyond the end of the The motor is shock mounted by was chosen because it assures dimensional shaft. The portion of the hose pro- the use of soft rubber pads glued to stability, minimizes moisture absorption truding beyond the shaft is then the bottom. The rubber mat must be and affords freedom from microphonics. ground down to the proper size by removed from the top of the turn- HYSOL epoxy compounds are used ex- holding a file against the rubber table for operation at 45 rpm be- tensively for impregnating, potting or while the motor rotates. cause the rubber drive shaft rests on encapsulating electronic components. The proper diameter of the rub- the top surface of the turntable. We Houghton Laboratories, Inc., has cooper- ber drive shaft is about 3/s in. The have been using 45 rpm adapters to ated with customers not only in the de- speed can be tested as the grinding hold the record on the turntable and velopment of specific material for a spe- down progresses by means of the this makes the use of the rubber top cific purpose, but also in developing commonly available methods of making molds and follow disc strobo- mat unnecessary. through to product acceptance. scope. In operation, the motor should Put Houghton Laboratories materials and experience to work for you. Let us help you with your problems, because our frank, honest opinions are yours for the asking. Write, wire or phone today. AES AWARD pAOafi Sumner Hall III, Chairman 4Q of the Awards Committee for the Audio Engineering Society, presents the AES ...... HITS HOUGHTON CASO TORIES. INC. A annual award to John D. S4 Colvin, Director of Engi- v c neering for Gates Radio ~fMICAI Co., Quincy, Ill. The cita- tion was given for Colvin's efforts and accomplish- ments in the formation oughton and progress of the so- ciety. laboratories, inc. OLEAN, NEw YORK 106 For product information, use inquiry card on last page. TELE-TZCH & ELECTRONIC INDUSTRIES December 1954 onger new type tr'rding ftUftp1MA. gives you 50% MORE recording time per reel ...on stronger, more durable %l 1ate polyester film With Type LB Audiotape, you get the equivalent of a reel-and -a -half of ordinary Type LR Audiotape is made on tape .. . a 1 -mil base of stronger, more 900 ft on a 5" reel durable "Mylar" polyester film 1800 ft on a 7" reel -withstands extreme tempera- a 101/2" 3600 ft on reel tures, is virtually immune to moisture, gives maximum tape life under all conditions of use and storage. This new Longer-Recording Audiotape saves time and effort, eliminates reel changes, gives uninterrupted continuity of re- cording and playback for any application where recording time exceeds the conventional reel capacity. Laboratory tests, as well as unsolicited testimonials by radio stations and recording experts, have conclusively demonstrated the superiority of LR Audiotape-in both performance and durability. It is also important to note that the largest users of longer playing tape are now insisting that it be made on "Mylar" polyester film, the base material used for LR Audio - AUDIO DEVICES, Inc. tape additional proof of its superior quality. - New York 22, N. Y. -recording 444 Madison Avenue, Ask your dealer for a supply of longer -lasting, longer Offices in Hollywood-Chicago Type LR Audiotape. A copy of Bulletin No. 211, giving com- Export Dept., 13 East 40th St., New York 16, N.Y., Cables "ARLAB" plete data and specifications on LR Audiotape, is yours for the asking. *Du Pont Trod. Mork TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 107 WASHINGTON «Mt 414 11,,w4 4eteet Latest Radio and Communications News Developments Summarized by TELE-TECH's Washington Bureau NO CHANGE-Barring some national emergency, the Funding Board, who had previously served for ten years effect of divided control in Congress will probably have on the staff of that state's regulatory commission. relatively small impact on President Eisenhower's ad- ministration policies in communications, broadcasting and electronics. This is especially true in this domestic MEXICAN BROADCASTING-Methods of establish- field. Of course over of wide areas administrative re- ing minimum interference operations, in broadcasting of sponsibility Congressional action is not required and the American and Mexican stations, particularly in night- administration will move along the same lines it has fol- time broadcasts, formed the subject of a conference be- lowed the past two years. tween delegations, representing the two nations, staged last month in Mexico City. The United States delegation was headed by former FCC chairman Rosel H. Hyde COMMITTEE CHAIRMEN-As a result of the final and the conference was attended by frequency officials of termination of the Senate race investigation of the tele- the Radio Corp. of America, Westinghouse, and broad- vision industry by the Senate Interstate Commerce Com- casting networks. The blueprint formulated by the two mittee might be shelved with the succession of Senator nations is especially important for clear channel stations. Warren G. Magnuson (D., Wash.) to the committee's Chairmanship over Senator John Bricker (R., O.) who had sponsored the inquiry. The House Interstate Com- AVIATION COMMUNICATIONS-Through the joint merce Committee which handles communications -radio efforts of the Air Navigation Development Board, Civil legislation in the next Congress is headed by Rep. J. Aeronautics Administration and Radio Technical Com- Percy Priest (D., Tenn.) who is a middle-roader and a mission for Aeronautics the half -way mark in the 15 - well -regarded veteran member of Congress. year government -industry program for developing a "common system" of air traffic control has achieved a record of accomplishments reasonably abreast of sched- ule. New developments open the way for refinements or McCONNAUGHEY VIEWS-Reaffirming his strong the need for still other equipment so no strict timetable principles of favoring "as few controls as possible, and can be observed and the sights of the program are now only those that are justified as basically necessary in the set beyond 1963. The focal point for the program is at public interests," FCC Chairman George C. McCon- the CAA new Technical Development and Evaluation naughey disclosed in an address before leaders of the Center at Indianapolis, with the Bell Telephone Labora- radio broadcasting and television industry his broad tories in charge of the development work. principles on educational television and broadcasting regulation. He proposed to the educators that they should not let the 252 educational TV channels lie idle for too long a time and should plan this service on the RADAR CONTROL-Use of radar in air traffic con- basis of economics and practical usage. He gave credit trol is under extensive investigation at the Indianapolis to the commercial broadcasting and TV stations and net- evaluation center. ASR -2 S -band and L -band radar works for their contributions in educational broadcasts stations are used to provide surveillance of the lower and video programs. While he is fundamentally opposed altitudes, secondary radar equipment associated with to FCC censorship of programs, the FCC Chairman cau- these radar sets provide position information from air- tioned broadcasters to be their own policemen through craft equipped with ANDB radar safety beacons. During voluntary codes to guard against excessive "sales plugs." the next government fiscal year, starting July 1, exten- sion of the enroute sector control will be expanded by the connection of the radar facilities in three Ohio cities with the Indianapolis center by microwave radio relay WOMAN COMMISSIONER-The Eisenhower admin- links. The major radio -electronics manufacturing coin, istration is considering the appointment of a southern panies are engaged in this ANDB radar program. woman Democrat to the FCC as a successor to Miss Frieda B. Hennock, New York Democrat, whose term expires next June 30. A possibility for the FCC appoint- ment is reported to be Mrs. Ann Rutherford of Nash- National Press Building ROLAND C. DAVIES ville, Tenn., Executive Secretary of the Tennessee State Washington, D. C. Washington Editor 108 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Send for this 9ezee SAMPLE FOLDER... fA lßf!! OffcR¡bttoq OS YIRltf ,a. 25 different Test Samples o high -dielectric INSULATING a.. . ..-.. TUBING and SLEEVING INCLUDES SAMPLES AND DESCRIPTIONS OF VARFLO TUBING AND SLEEVING Vinyl -coated Fiberglas in full range of sizes, colors and grades. Extremely flexible THE FOLLOWING ... with excellent heat aging qualities. Low priced. VARGLAS SILICONE Class H insulating materials were pioneered by our Laboratory. Retain flexibility, electrical VARFLEX COTTON TUBING AND SLEEVING Varnish or lac- properties and mechanical strength in temperatures ranging quer impregnated - for applications where MIL -I-3190 from -85°F. to 500°F. Available in tubing, sleeving, lead Class A materials are specified. All NEMA grades. wire, tying cord. EXTRUDED TUBING stand- PERMAFIL-IMPREGNATED VARGLAS TUBING Fiberglas SYNTHOLVAR Made in various and braid coated with General Electric's Permafil resin. Ex- ard formulations of vinyl polymers. Has high dielectric nor absorb tremely tough, resistant to solvents and elevated tempera- tensile strength-will not support combustion MIL -I -631A. Several tures, highly flexible. Can be bent or twisted with little or moisture. Type EG Approved under no loss of dielectric strength. Coils and standard 36" lengths. others to meet special requirements. VARGLAS SLEEVING AND TUBING Numerous types and grades-including synthetic -treated, varnished, lacquered, saturated, litewall and others. SLEEVING AND VARGLAS NON -FRAY SLEEVING Fiberglas braid normalized NEW! VARGLAS SILICONE RUBBER to remove all organic impurities. It will withstand tempera- TUBING-the culmination of 5 years of research-for De- tures up to 1200°F. Recommended where dielectric prop- applications requiring extraordinary flexibility. erties are not paramount. Three types available. tails on request. MAIL COUPON TODAY FOR SAMPLES! VARFLEX CORPORATION, 508 W. Court St., Rome, N. Y. Please send me free folder containing samples of your electrical sleeving and tubing. for: CORPORATION I am particularly interested in insulation u NAME Makers of Electrical Insulating COMPANY STREET Tubing and Sleeving 3 CITY ZONE STATE IssmaiI information, inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 IMOJFor product use 109 New Electronic Products LOAD ISOLATOR TAPE RECORDER INTERVAL GENERATOR Model X2OL unidirectionally attenu- The professional Model DTM "Dyna- The Model 3157 multiple -sequence ates load reflections without appreciably cord" tape recorder is driven by a new Mc preset interval generator develops a reducing the available generator power. type hysteresis motor in which the fly- series of preset time delays adjustable The resonance absorption characteristics wheel is the rotor and the capstan that in increments of 1 µsec. A 1 Mc crystal - of ferrites used in the X2OL enable advances the tape is the rotor shaft. An controlled master oscillator feeds one higher isolation over a wider band of frequencies than that available in pre- electric current stops the reels for the or more preset counters capable of pro- vious units. A minimum isolation of 19 proper time at the desired moment. ducing an output pulse of any desired db and an average of 25 db is provided Dynamic braking is designed to main- number of counts (µsecs) after appli- over an 8,600 to 9,600 Mc band. Maxi- tain low tape tension without stretch- cation of a start pulse. Up to 999, each mum input VSWR is 1.5 to 1, with out- ing. Unit has pushbutton controls for counter is set at the desired number of put shorted, and power as high as 20 w record, fast traverse, play, and stop. In- µsecs by means of front panel selector can be applied. Other operating charac- terlocking prevents accidental erasure; switch. Direct indication in µsecs is by teristics and frequency ranges available. tape spillage, or breakage. Has three neon lamps in binary-coded decimal Litton Industries, Microwave Com- motor construction, 1 capstan motor, 2 form. Potter Instrument Co., Inc., 115 ponents Div., 336 N. Foothill Rd., Bev- capacitor run torque motors. Accomo- Cutter Mill Rd., Great Neck, N. Y.- erly Hills, or 215 S. Fulton Ave., Mt. dates up to 101/2 in. reels inclusively. TELE-TECH & ELECTRONIC INDUS- Vernon, N. Y.-TELE-TECH & ELEC- Pentron Corp., 777 South Tripp Ave., TRIES. (Ask for 12-13) TRONIC INDUSTRIES. (Ask for 12-1) Chicago 24, Ill.,-TELE-TECH & ELEC- TRONIC INDUSTRIES. (Ask for 12- 15) KLYSTRON MATING STRIP The Model X566 for distance measur- Female mating strip No. 3372 is de- ing equipment delivers over 20 kw of signed for permanent base mounting, MICROWAVE SYSTEM peak pulse power with only 100 mw and to be used with male connectors drive-a power gain of 53 db in UHF HHB Nos., 3367 and 3369. Fifteen pres- The TRC-12 "Telelink" is a new low- operation at 900-1,400 Mc. A feature is sure type sockets of beryllium copper cost communications microwave system the "Eimac" modulating anode which are provided. Nominal creep of %2 in. designed and engineered to provide re- greatly simplifies pulsing equipment. Solder tabs are supplied for No. 20 wire. liable service for one and two channel Ceramic and copper construction en- Plating is gold over silver. Standard in- operations in the telephone industry, ables wide range tuning and easy ad- sulating material is 3700 green, mineral - pipeline companies, railroads, power justment of input and output coupling filled phenolic. Units are also available companies, air lines, turnpike authori- devices. Especially significant is the av- in mineral -filled phenolic type MFE, ties, and state and city governments. It erage power capability of 1 kw which features low equipment cost, low in- would allow a 5% duty cycle with a stallation cost, and low operational cost. 20 kw peak output; 10% with 10 kw, No outside housing is required. Stand- ardized, long -life parts are used throughout. All components are selected to operate well within their rated values. Raytheon Manufacturing Co., Waltham 54, Mass.-TELE-TECH & ELECTRONIC INDUSTRIES. (Ask for 12-6) MORE TECHNICAL INFORMATION describing the new products presented phthalate here may be obtained by writing on diallyl MDG, or general pur- company letterhead pose phenolic CFG. Printed circuit con- to New Products Editor, TELE -TECH & ELECTRONIC nector information available to design INDUSTRIES, 480 Lexington Ave., New engineers and executives. H. H. Buggie, York 17, N.Y., listing numbers given at etc. Eitel -McCullough, Inc., 798 San Inc., 726 Stanton St., Toledo 4, 0.- end of each item of interest. Please Mateo Ave., San Bruno, Calif.-TELE- TELE-TECH & ELECTRONIC INDUS- mention title of position held. TECH & ELECTRONIC INDUSTRIES. TRIES. (Ask for 12-2) (Ask for 12-8) no TELE -TECH & ELECTRONIC INDUSTRIES December 1954 for rapid d isconnect use cannon "unit pl, ug-in" connectors speed up inspection...testing...maintenance! faci itate interchangeability! You can connect, disconnect, interchange, replace, test, and inspect instruments, assemblies, and sub -assemblies easily and rapidly when you use Cannon "Unit Plug -In" multi -contact electric connectors. You'll find some with shells... some without. Shell style units ... in a wide variety of designs ... are ruggedly corstructed to take the many "in" and "out" op:rations of rack, panel, chassis, and sub -assembly applications. Varied, simple, but always rigid mounting facilities provided on each connector half. Standard, miniature, sub -miniature sizes. Eitler connector half may be made into a plug by use of an end bell. Up to 156 contacts. And ... an amazing nurr ber of combinations of contacts for contnl, audio, thermocouple, co -ax, twin -ax, as well as pneumatic connections. In single- or double -gang. Special moisture -proofed types. Standby units feature gold-plated contacts to withstand deterioration and corrosion. Write for full information. Write TODAY! first in connectors CAN NON Please refer to Dept. 201 CANNON ELECTRIC COMPANY, 3209 Humboldt Street, Los Angeles 31, Caifornia. Factories in Los Angeles; East Haven; Toronto, Canada; Londoi, England. Contact representatives and distributors in all principal cities...... Copper Laminates during normal operating conditions. Thermosetting adhesives are made new ARC *%.s. (Continued from page 104) from urea-, melamine-, phenol-, or resorcinal-formaldehyde resins. materials. Requirements are partic- While cold flow is not a problem, course indicator ularly rigid because the adhesives these do not possess the necessary used in printed circuit materials degree of shock resistance. The most puts two instruments must possess the following qualities: satisfactory adhesives are the mix- 1. Be sufficiently strong to with- tures of thermosetting and thermo- stand punching, milling and plastic resins which retain the de- in ONE! other fabricating procedures, sirable qualities of each type. along with innumerable han- dling and assembly abuses. Bonding Process 2. Be able to resist strong etching mechanics of bonding solutions. The actual foil to a laminate may be accom- 3. Must possess sufficient heat re- plished by one of two methods. Class sistance to withstand the baking 1 foil -clad laminate is produced from of resists prior to etching and a predetermined number of resin - to permit soldering without impregnated sheets to which a thin, blistering. dry sheet of adhesive film is added, 4. Must be resistant to moisture. followed by a sheet of metal foil ap- 5. Must match the laminate in proximately 0.0027 -in. thick. The electrical properties. entire build-up is then subjected to ARC #16706 heat (approximately 320°F.) and The most satisfactory adhesives r for bonding laminates are the ther- high pressure (approximately 1000 Now users of the light, compact mosetting and thermoplastic types, psi) for about one hour. The adhe- A R C Type 15D navigational sive and foil may be added to both receiving equipment can employ usually in combination. Thermo- a single panel instrument that plastic adhesives are made from sides of the build-up. performs the work of two units rubber, rubber substitutes, cellulose Class 2 foil -clad laminate is de- previously used. The cross -pointer resins of the signed to meet closer thickness tol- meter and the ester, or thermoplastic course selector have vinyl type. These adhesives are erances than Class 1 material. It is been combined into one part that finished, fits a standard 3W' instrument hole. characterized by their rather poor produced by sanding a This saving in instrument panel heat resistance and susceptability to cured sheet of laminate to the de- space is important, particularly now blistering during soldering opera- sired thickness, after which the ad - that dual VOR installations are to cold flow (Continued on page 114) so popular. In addition to the space tions. They also tend saving, installation costs are cut. Ask your dealer to specify the new #16706 Course Indicator as part of your 15D Installation-whether National Vulcanized Fibre Co., Wilmington, Delaware reports Single or dual. The indicator may on copper -clad laminates: be purchased separately for use with older Type C D and equipment. of cop- Write for complete data. Fig. 1: (below left) Chemical treatment per foil surface removes oil and grease and acts Aircraft to improve bonding of copper to laminate base Radio Fig. 2: (r) Copper foil being laid on "build-up" Corporation of base laminate. Foil ranges 0.0028 to 0.0035 in. in thickness; weighs 1 or 2 oz./sq. ft. It BOONTON NEW JERSEY Fig. 3: (below right) Copper clad sheets being re- TYPE I 5D EQUIPMENT moved from hydraulic press, where they have been For Airborne Reception of bonded at 300° F, 2000 lbs./sq. in. for 30 min. Omni -Directional Ranges Visual -Aural Ranges Runway (Continued on page 116) Localizers GCA Voice Simultaneous Voice R-138 Receiver with D -10A Dynamotor 8-13 Converter, E-14 Rack and M-10 Mounting C -22A Control Unit, - ill M-18 Mounting A-138 Antenna 112 For product information, use inquiry card on ast page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 :49F4f? : .. ' rr%i .k :.. r, i* ÿr'.3 Got a problem? The solution: This engineer just solved one in a ratter of TI -e exact part he tee is is found on moments with his copy of Catalog No. 200, pige 3. Hermetic )a-1 number NEC Vac -Tits* Compression Multi -Headers: 3751-400 EA4 me its the need per fe:tl; with four km inals, hooked The Problem: outside, straght-mt inside; a ria 4 -terminal headers flange reversed bocy, for IC" ,gib for a cover on a sensitive relay enclosure. inside mount ng in a plain, pierced, .350 dia. nelE. tr-z srk 1;A-4.'3,ay FREE! Our New Addition to Your Encyclopedia Hermetica flaw Available, Hermetic's Catalog No. 200, Offering Unparalleled Coverage of .,.. . ,s .;.u,sONSION yac-tite Vac -Tite* Compression Multi -Headers. w.....WSst a.,..-,.. compression . .sse ... , ... m-~°' ..s Ths handy desk -side reference on compression multi -headers is multi -headers th r latest volume of a series on hermetic seuls for electronics "fackaging". This series codifies and cataloge every significant innovation in hermetic seals. When complete, we believe you will fird the "Encyclopedia Hermetica" the easiest, most helpful source of design and purchasing information on hermetic seals available in the industry. Hermetic's Catalog No. 200, Vac -Tite* Compression Multi - Headers, lists over 2,500 separate variations in body constructions, si:es and terminations. This wide selection is cocified and arranged in an easy tabular form so that selection is almost automatic. When using this catalog, almost any conceivable preferred type of multi - header can be located and identified by its exact Hermetic number in a matter of seconds. You will find a copy of this latest volume of the "Encyclopedia Hermetica" a most useful desk -side aid in selecting the exact m ilti-header you need-why not write today for your tree copy? #Vac-Titea major improvement in mechanical strength and rigidity, achieved by Hermetic's exclusive glass -to -metal :hemically bonded canpression construction. í' + e 33 South Sixth Street, Newark 7, New Jersey use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, 113 LOWER Copper Laminates (Conti?tned from page 112) hesive and foil are added. It then YOUR SET goes back to the press for a second application of heat and pressure. In all cases the adhesive layer eventu- ally becomes an integral part of the COSTS laminate and must match the NEMA characteristics. Bond strength varies with foil WITH THIS thickness. In general, the greatest adhesive strength is achieved with thicker foils. The bond strength of LOWER Synthane foil -clad laminates is about -PRICED 5 lbs. minimum. Strength is tested by scoring the foil side of the lami- nate to produce a strip one inch D E PE NDAB LE wide. A portion of this strip is peeled from the laminate and a clamp is affixed to the end. The clamp sup- ports a container into which sand or S PEAKE R lead shot is poured. The weight of the container when it causes the test strip to peel is considered the bond strength. Heat Tests Because it is necessary that foil - clad laminates withstand soldering, heat resistance tests have become standard. A specimen may be tested in a dry circulating air oven (275° of 4" and 5" F.) for 30 minutes or floated in a pot Alinespeakers of molten solder, foil side down. The designed for peak resulting foil -clad materials may be performance. Break sawed, milled or drilled. Standard off or cast magnet punching grades are also available. may be used. Parts are usually fabricated after printing and etching. More than a hundred companies priced only because offer some type of commercial design Towof unusually efficient and fabrication service for "printed" manufacturing techniques. circuitry. Many of these companies, (and their numbers are increasing daily) process foil -clad laminates exclusively. Although there are many produced under rigid variations, most processing methods quality control. Metal utilize some form of photo -etching stampings completely to produce a circuit. Methods based manufactured in our own Tool, Die and Punch Press Depart- upon silk screening processes, run a ments. Exceptionally thorough final inspection. close second in popularity. )lugs, transformers and/or brackets to your 23- specifications. Conclusion = ower your set costs with this dependable speaker. Write for further in- A rough idea of the future of formation TODAY. thermosetting laminates in printed circuitry can be obtained from the fact that the average production run OTHER HEPPNER PRODUCTS: of television sets is between two and Ion Traps, Centering Devices, Fly - three thousand per day. Each of Back Transformers and Focomags. HEPPNER these TV sets will eventually use MANUFACTURING COMPANY about one pound of foil -clad lami- ROUND LAKE, ILLINOIS nates. Major producers of radio sets (50 Miles Northwest of Chicago) assemble an average of one million Phone: 6-2161 sets per year, each of which will in- Device Representatives: Specialists in Electro -Magnetic corporate printed circuitry. Manu- facturers of computers and various JAMES C. MUGGLEWORTH, 324 Haddon Avenue, Collingswood 7, New Jersey RALFH HAFFEY, types of electronic office equipment R.R. 1, U.S. 27, Coldwater Rd., Ft. Wayne 8, Indiana IRV. M. COCHRANE CD., 408 So. as Alvarado St., Los Angeles, Calif. JOHN J. KOPPLE, 60 E. 42nd St., New York 17, N. Y. see printed circuits the answer to space problems. 114 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 sO TELECHROME SHOWS THE WAY DRIFT PROBLEMS IN COLORPLEXING EQUIPMENT Automatic Balance Control for ALL COLORPLEXERS ALL COLORPLEXERS DRIFT t:SS OF MANUFACTURE. One of the most difficult problems with which the color TV broadcaster is faced is that of drift in the modulator sections of the colorplexer. ALL COLORPLEXERS DRIFT, some more than others, but- On the average, colorplexers require at least two hours of warm-up time and must be re -balanced a few times during a normal day's operation. Unbalance causes color receivers to "see" the wrong colors. TELECHROME'S new Model 617 -BR Automatic Balance Control completely eliminates drift problems and works with ALL TYPES OF COLORPLEXERS REGARDLESS OF MANUFACTURE. ELIMINATES DRIFT PROBLEMS An ingenious circuit locks the entire color encoding equipment in balance within 20 seconds after being turned on. Thereafter balance is held, even after weeks of operation. The Automatic Balance Control holds balance even under conditions where ordinary colorplexers would go completely out of control-tubes may be replaced, room temperature conditions may be varied, line voltages may be changed, manual controls may be turned, tube types may be substituted-NONE of these conditions offects the colorplexer kept under control by the TELECHROME Model 617 -BR Automatic Balance Control! WARM-UP TIME IS UNNECESSARY; this alone saves many engineering hours per week. And need for stand-by personnel to reset balance is eliminated. A memory system is incorporated so that interruptions in signals or switching tran- sients will not interfere with the operation of the correction circuits. NEW AUTOMATIC BALANCE CONTROL COLORPLEXER The Model 609 -ER Colorplexer is the ONLY unit engineered to incorporate Automatic Model 609 ER Colorplexer Balance Control in order to eliminate chroma unbalance components in a color signal with Built-in Balance Control and to keep the colorplexer in balance et all times. This new Colorplexer design com- pletely eliminates the necessi y for manual adjustment of balance controls. DEL/VERY 30 I) I'S Full facilities Chrorrascope Transmits, Chromalyzer receives, Vector Phase Slope Portable Display (Envelope Delay) monitors, Color Bar Signal Curve Tracer analyzes composite Generator Curt lication color pictures Literature on these and more than 100 addi- The Nation's Leading Supplier of Color TV Equipment tional instruments for color TV by TELE - Road Y. CHROME are available on request. 88 Merrick Amityville, N. AMityville 4-4446 TELE-TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 115 Copper Laminates (Continued from page 112) Fig. 4: Testing bond tightness. Done on a 1 x 4 in. strip with a 7 in. peel Fig. 5: Dip solder tests. One sq. in. blocks Chosen for use in "the world's of copper clad phenolate are checked worst weather" atop New Hamp- for blistering and adhesion. Usual - NEMA test is 2200 C for 10 seconds shire's Mount Washington - tr e AMCI Type 1040 Antenna hanc les severe ice storm and high winds for Station WMTW (TV) Channel 8 with On Automatic Chassis Production no decrease in transmitting efficiency. Last September the editors of TELE - TECH AND ELECTRONIC INDUSTRIES pre- With ice accumulating at a rate of 41/2 inches per hour and sented the first pictures of a new ma- winds averaging better than 100 miles per hour on Sept. 22-23, chine for the automatic production of a electronic chassis developed at the combination of solid and rime ice built up to the 4-foot thick- United Shoe Machinery Corp. in Bos- nesses shown above. Yet the deicers, operating at 1/16 power, ton, Mass. More detailed photos below kept the antenna clear and allowed normal and review the operation of this equipment operation normal which, incidentally, is now undergoing reflectometer readings throughout the storm. trial runs at an undisclosed manufac- turing plant. (rumored to be RCA) And this antenna successfully withstood hurricanes Carol (Continued on page 130) and Edna, in which wind velocities exceeded 140 miles per hour. AMCI transmitting antennas available for full- or stand-by service on channels 7 through 13. Write for bulletin T-912. ANTENNA SYSTEMS-COMPONENTS-AIR NAVIGATION AIDS-INSTRUMENTS Manufacturing Co., Inc. ALFOR D299 ATLANTIC AVE., BOSTON, MASS. O eroll view cf first machine in plant 116 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 RCA r VrOrA.,.,.. . NiÓÀ NEWS FOR DESIGNERS ,; t¡A+dç i+i+i+!+l+ii!+i+rfi+8 +I+4 FROM THE RCA TUBE DIVISION NEify RCA-6CG7 Miniature Version of 6SN7-GT The new 9 -pin 6CG7 is an RCA development. It's a general-purpose, medium -mu twin triode intended particularly for use as a vertical and horizontal deflection oscillator in TV receivers. Because of its compactness, the RCA-6CG7 is ideal for use in printed circuit sockets. It employs a structure which permits cool operation of the grids to minimize grid emission, and an internal shield to prevent coupling between the triode units. Designed with a 600 -ma heater having a controlled warm-up time, the tube assures dependable performance in series -string TV circuits. The RCA-6CG7 can also be used as phase inverter, multivibrator, sync -separator and amplifier, and resistance -coupled amplifier. POWER TUBE RCA "SPECIAL REDS" for special industrial applications TWIN BEAM The 10,000 -Hour Plus Line for 450-470 Mc Operation RCA "Special Reds" are receiving -type tubes de- signed specifically for unusually exacting require- ments. These tubes offer extremely long life plus the special characteristics needed wherever uninter- rupted operation of equipment is required. These tubes are engineered to minimize the effects of shock, vibration, and the continuous operation found in industrial service. Their high quality is "built in" rather than "tested in." So insist on RCA "Special Reds," the finest receiving -type tubes your money can buy for rigorous, industrial applications! RCA BATTERIES-Types for virtually every need! More than 80 different types ...ranging RCA -6524 from the tiny penlite batteries to large is well -suited for fixed and mobile types for industrial application ... make UHF design-as a balanced push- up the RCA line. Special types are avail- pull rf power amplifier or frequency able for circuit designers and experiment- tripler. Delivers 20 watts (approx.) ers-such as the small, versatile "slice - under ICAS conditions in class C cw away" batteries (VS087 and VS068) for and fm services-at 462 Mc! Maxi- use with subminiature tubes and tran- mum plate dissipation is 25 watts sistors. RCA application engineers will (ICAS). Cathode inductance is re- gladly discuss your design problems with duced to a negligible value by a you. Write for battery catalog (BAT1348). common cathode for the two units. For technical data on any of the products shown, write to RCA Commercial Engineering Section, LSOR, Harrison, New Jersey ELECTRON TUBES SEMICONDUCTOR DEVICES BATTERIES TEST EQUIPMENT ELECTRONIC COMPONENTS ofh RADIO CORPORATION of AMERICA es> TUBE O/VISION HARRISON, N.J. Information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product 117 Military Contract Awards Electronic products, dollar value, and names a masterpiece of------mamilligil9 accuracy of manufacturing contractors receiving awards as reported by U.S. Dept. of Commerce. Battery-33,510-Ray-O-Vac Co., 212 E. Wash- ington Ave., Madison, Wis. Electron Tube-94,675-Eitel McCullough, 798 San Mateo, San Bruno, Calif. Electron Tube-35,133-Eitel McCullough, 798 San Mateo Ave., San Bruno, Calif. Electron Tube-85,245-Raytheon Mfg., Newton, Mass. Electron Tube-42,160-Sylvania Electric Prod- ucts, Inc., 1740 Broadway, New York 19, N.Y. Indicator, fuel-59,851-Eclipse-Pioneer Div., Bendix Aviation Corp., Teterboro, N. J. Generator Set, electric-82,342-Gremce Inc., Ft. Worth, Texas Generator, control panel-124,809-General Electric Co., Schenectady, N. Y. Radar Set-996,124-Sperry Gyro Co., Div. Sperry Corp., Great Neck, L. I., N. Y. Overhaul and Repair, radar sets-1,070,000- Motorola, Inc., Chicago, Ill. Generator, tachometer-27,131-General Elec- tric Co., 1405 Locust St., Philadelphia, Pa. Actuators-65,836-Air Associates, Teterboro, N. J. Earphone Cushion-49,265-Permaflux Corp., 4900 W. Grand Ave., Chicago 39, Ill. Battery, storage-45,097-Price Battery Corp., Grand St., Hamburg, Pa. Cable, watertight-261,429-Anaconda Wire & Cable, P. 0. Box 128, Hastings -on -Hudson, N. Y. shock The -Proof, nylon mounted Cable, watertight-28,800-Rockbestos Products Reeves-Hoffrnan Crystal L'uit Corp., Nicoll and Canner Sts., New Haven 4, ¡illustrated IMC, CR -181n) Conn. Cable, watertight-230,200-General Electric Co., Construction Material Div., Wire & Cable Dept. 1285, Boston Ave., Bridgeport 2, Conn. Cable, watertight-61,781-Phelps Dodge Cop- per Products Corp., Habirshaw Cable & Wire Div., 40 Wall St., New York 5, N. Y. Cable, watertight-35,928-General Cable Corp., 123 S. Broad St., Philadelphia, Pa. The RH -7N utilizes one of the latest electronic developments to Cable, telephone-28,536-Plastoid Corp., Ham- come out of Reeves' laboratory-the new nylon nest mount for burg, N. J. crystals. This nylon nest permits Reeves to go down to 500 kc Cable, watertight-37,318-Collyer Insulated Wire with an AT cut in an HC -6 holder, with remarkable stability in Company, 249 Roosevelt Ave., Paw. tucket, R. I. frequency control. Acoustic Cable Reel-122,516-Combined Indus- tries, Catskill, N. Y. The RH -7N is built to meet the requirements for MIL types: CR- 1 8, Elements, storage battery-2,966,764-Gould 19, 27, 28, 35, 36 and 48/u. Write today for further information. National Batteries, Inc., Depew, N. Y. Chassis, amplifier-652,131-Bill Jack Scien- tific Instrument Co., Solana Beach, Calif. Amplifier, type D-1-147,034-Allen B. Dumont Lab. Inc., Clifton, N. J. Receiver, transmitter selector control-2,424,- 660-Webster-Chicago Corp., Chicago, III. SHOFFMAN Dynamotor-86,698-Red Bank Div., Bendix Aviation Corp., Eaton, N. J. CORPORATION Spare Parts, radar trainer-450,000-Gilfillan Bros., Inc., Los Angeles, Calif. Components, radio set-120,618-Stewart-War- ner Corp., Stewart -Warner Elec. Div., Chicago, III. -R Computer, control-109,541-Western Electric Co., Inc., New York, N. Y. Radio Set-1,391,457-Sylvania Electric Prod- ucts, Inc., Radio and Television Div., Buffalo, N. Y. A SUBSIDIARY OF CLAUDE NEON. INC. Gyroscope, miniature-31,672-Kearfott Co., Inc., 1378 Main Ave., Clifton, N. J. Radar Set-12,228,554-Western Electric Co., New York, N. Y. Generators, signal-251,693-Hewlett-Packard Co., Palo Alto, Calif. CHERRY AND NORTH STREETS Rheostats-18,072-Ohmite Manufacturing Co., CARLISLE 2, PENNSYLVANIA 3601 W. Howard St., Skokie, Ill. Relay -26,348-R B -B -M Div., Essex Wire Corp., Logansport, Ind. Indicator, azimuth-range-456,949-Motorola, Inc., Chicago, III. (Continued on page 132) 118 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 NEW SINGLE LENS GRAVIE ECTO STAR PERFORMER.... for TV commercials Precision Projection BETTER Commercials at LOWER COST Yes ... now you can use better 2" x 2" transparencies in uninterrupted sequence at lower cost. Important too, Gray Telo- jector is low in initial cost .... ideal for Complete Projection System budget -minded program directors. Telo- jector is compact, light weight, trouble - The New Gray 3B Telojector (2" x 2" Trans- free. Two turrets take up to 12 slides at one loading. Additional loaded turrets are parency Slide Projector) UI lues a single lens substituted in a matter of a few seconds -permits superposing of two images on an ... providing unlimited continual sequence. optical axis eliminates need ... any for ex- Controlled locally at the unit or remotely ternal registration adjustmen'. The improved at the master video console. Also, can be unit provides positive focusing of images on used with the Gray 35B Manual Control the camera tube with an uninterrupted se- Box to produce superposition, laps, fades and slide changes at any desired rate. quence of slides-, for television commercials, news flashes and photographs or station and sponsors' identification. WRITE FOR: Illustrated, detailed information on the NEW, SINGLE LENS GRAY TELO-JECTOR and complete line of Gray Television - Broadcasting .ANI) DEVELOPMENT CO.. Inc., Hilliard St., Manchester. Conn. Equipment. Division tithe GRAY MANUFACTURING COMPANY Originators ,rf the Gray Telephone I'ay Station and the (:ras Audograph and PhonAudograph. TELE -TECH & ELECTRONIC INDUSTRIIES December 1954 For product information, use inquiry card on last page. 119 HAVING "Pig Tailoring" Speeds Manufacture BRUNO -New York Industries ing of standard component leads, or Corp., New York City, has de- pig -tails, and sleeved or bare wire PRINTED veloped a technique, and associated jumpers, to enable uniform assem- equipment, to simplify the process of bly. assembling resistors, capacitors, di - To accomplish lead -tailoring, a CIRCUIT small foot-operated machine (Fig. 1) is being manufactured by Bruno - New York Industries Corp. under the trade name "Pig -Tailor." It is capable of simultaneously and accu- rately measuring, cutting and bend- ing both axial leads of any compo- nent at the average rate of 750 units per hour. Both leads can be cut to any individual length and bent at any desired point at right angles to the axis, either in the form of a "U" or an "S." No accessory fittings or SOLDERING attachments are required. The ma - OR Fig. 1: Foot -operated machine for lead FLUX tailoring now being manufactured odes and other axial lead compo- nents, as well as sleeved or bare wire PROBLEMS? jumpers; simultaneously reducing labor cost and increasing quality. The production technique is titled write or call "Pig -tailoring," and is practical for both short and long run production. The process breaks down into two prime steps; namely, (1) Prepara- tion and (2) Assembly; and is ap- plied to the incorporation of axial pigtail components in electronic as- semblies, with either standard or Fig. 3: Use of spinner with tailored compo- ALPHA nents eliminates excessive lead tautness chine is completely flexible and ad- justable to any cut, bend and shape within a maximum set-up time of 3 minutes. Any component of 1 in. di- A Trusted ameter or less and not exceeding 6 Name in. overall, including uncut leads, in the can be processed. Electronic Industry In operation, the body of the com- ponent or wire jumper is placed be- The facilities tween the two guide supports which of a modern, are adjustable to any body length. well equipped metallurgi- The component leads fall into the cal laboratory, competent aligned notches of both sets of shear- ing and bending elements, before the research staff and trained foot pedal is depressed. Depressing field engineers are avail- the foot pedal drives the keyed drive shafts, on the left and right sides of able to help you solve the center support, through a double printed circuitry prob- Fig. 2: Tool for fast and uniform spinning reversible linkage, thus rotating both lems. of tailored component leads on terminals sets of shearing and bending ele- ments. The direction that each keyed turret type terminals or printed cir- shaft drives is dependent upon the ALPHA METALS, INC. cuit board holes. position of one drive link at each end of the machine. It is the independent 58 Water St., Jersey City 4, N. J. Preparation direction change of these two links HEnderson 4-6778 that provides for the "S" or "U" Preparation, or lead -tailoring, is formed leads. Specialists in SOLDER, FLUXES for over 50 years the combined operations of accu- Shifting of one or both links by rately measuring, cutting and bend- relocation of a screw in the eccentric 120 For product Information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 LOCKHEED SUPER CONSTE_L'TI'DJ How to SILENCE four throbbing hearts... In each engine nacelle of the World's Longest Range Airliner - the Lockheed Super Constellation - are electrical fuel pumps ... the airliner's four throbbing hearts. Constant pumping action of these units sets up pulsing interference in the Constellation's radio equipment ... upon which the well being of 99 passengers depends. The electrical interference from these four pumps must be filtered out for good ... a unique R.F. noise suppression filter is required, one tough enough to withstand extensive temperature changes, constant high engine heat, the freezing cold of high altitudes, rapid changes in atmospheric pressure, successive acceleration and ASTRON AF -263 deceleration plus the twisting, ripping vibration set up by each engine's torque. Subminiature Filter Lockheed handed this "toughie" to Astron, recognized leader in the development and manufacturamgof high quality R.F. interference filters. Astron's engineers had Under every developed a subminiature filter with solid dependability that significantly cut environmental extreme maintenance and replacement cost. So successful and versatile is this Astron filter -dependable operation. that the USAF now uses a similar hermetically sealed unit in one of its "drone" target planes, who's exact flight performance is governed by the clarity of the radio control signals received. Efficient and economical solutions to complex interference problems like these have become commonplace over the years at Astron ... whether you require a conventional unit or a unique type-rely on Astron to recommend or develop the proper design to fill your most exacting specifications. Astron "know how" gives you true filter Find out today miniaturization with an absolute minimum of size, weight and volume achieved how Astron can reduce through a highly successful combination of miniaturized elements wiith most modern your filter costs .. design concepts, and construction techniques. write for your personal copy of the new Astron filter catalog NOW! C OR POR A TIO 255 GRANT AVENUE. E. NEWARK. N. J. Ave., Toronto 10, Ontario Export Division: Rocke International Corp., 13 East 40th St., N. Y., tv. Y. In Cenado: Charles W. Pointon, 6 Alcina card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry 121 Pig Tailoring (Continued from page 120) drive collar at each end will provide complete direction change. Each of the shearing and bending elements has key -slotted bushings that enable sliding adjustment from the center to each end of the machine and a single Allen set screw to fix their ultimate cutting and bending posi- tions. Each of the shearing and bending elements consists of notched fixed and rotary members. Due to the relative positions of the leading edges of the shearing elements to the leading edges of the bending elements, the shearing is accom- plished first, followed by the bend- ing. The production models of the lead -tailoring machine include an TAKE THE GUESSWORK ejection device. The lead -tailoring operation can be taught to an unskilled operator OUT OF SCOPES within one hour, and with less than one day's experience a production It's all done by combining any number of electron guns up rate such as mentioned above can to ten in a single cathode ray tube. Then, when you have to be expected. measure simultaneous phenomena, you've actually got a num- Assembly, the second step in the process, utilizes another device, ber of oscilloscopes in one-all operating continuously with- titled "Spin -Pin," see Fig. 2. The out the disadvantages of electronic -switching or an optical essential purpose of this companion system. And only ETC .«iulti-channel scopes and multi -gun tool is for fast and uniform spinning tubes make Simul-Scopic signals available to meet such a wide of tailored component leads, around variety of individual needs. turret type terminals. It eliminates the need for longnose pliers and the contingent training and skill -CHANNEL SCOPES re- MULTI quired for their use. ... with the combination you need of band The use of the spinner (Fig. 3) width, gain, sensitivity, frequency response, with tailored components, eliminates excessive lead tautness and broken with or film strip recording. Sepa- without components. The tailored lead wire rate intensity, focus, and axes controls for can be completely spun on the each channel. terminal, leaving no protruding end to be clipped. Either clockwise or MULTI -GUN TUBES counterclockwise turns can be applied. ... with 2 to 10 guns ... round or square The important element in the face ... 3 to 12 inches. Special purpose tubes design and operation of the lead - made to specification, including every type spinning tool is the spiralling of the capable of commercial manufacture. end of the lead over the adjacent section of the same lead. THIS FREE CATALOG The equipment described here has seen two years of constant use on . . . entitled "Oscillography-Key To The the production line without main- Unknown", shows why there is no other equip- tenance of any kind. It is rugged, ment so easy to use, so comprehensive in its completely adjustable, requires no power . can be easily practical supply, and presentation, and so economically arranged for air operation and for simultaneous oscillography. Write for equipped with a counter. your copy. IRE Show Adds Space *S1111111-SCOpie Two or more simultaneous - 700 radio -and -electronic firms will can events which be observed on a cathode exhibit in the 1955 Radio Engineer- ray tube (Reg. Applied for) ing Show, Mar. 21-24, a gain of 16% over 1954. A large skating rink on Jerome Avenue, .2 mile south of the rt Kingsbridge Armory, will have ad- tO1,0 ditional exhibits. The 1956 Conven- 00002f0000 001901o0o41 tion will be at the new New York 1200 E. MERMAID LANE, PHILADELPHIA 18, PA. Coliseum. 122 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Keystone announces .. . a new tubeless MOTO M.IgG Now, from the world's leading producer of magnetic amplifiers...a new tubeless two -stage magnetic amplifier of saturable transformer type remote control devices Pis" high x 21/4" deep x 2%" wide mounting dimensions 15/e" x 13/4" chassis cutout 1" diameter weight 13/4 lbs. Newest members of the famous MOTO MAG family, CAPACITOR FOR 30° PHASE SHIFT these improved models offer several unique advantages: MOTO In many applications they eliminate use of a pre -amplifier SIGNAL +AAG Smaller size - fit into more installations Operate on a smaller signal 2 B h10TOR Self-contained phase detector INPUT 115V 400 Incorporate high -temperature germanium diodes for high operating temperatures power input 115 volts 400 cycles output 115 volts 6 watts AC phase reversible output at These hermetically sealed units provide precision variable zero signal 13 volts maximum phase power control with a minimum of size and weight. signal for full output 800 microamps control circuit Six standard models available - each can be quickly and resistance 2800 ohms response economically adapted to meet your individual specifications. 63% .06 seconds phasing capacitor .4 microfarads PRICES: temperature range -40°C. to -100° C. AC control available 1-24, $58 ea.; 25-49, $40 ea.; 50-99, $35 ea.; 100-299, $32 ea.; on special order 300-499, $30 ea.; 500-999, $28 ea.; 1000-2500, $27 ea. Write today for complete specifications, performance data, and quotes to meet your specific application. keshwe PRODUCTSTSCOMPANY C STREET UNION CITY 2. N. J. UNION e-5400 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 123 `e PERSONAL D. C. Perrine, Jr. has been appointed director of engineering of the Pacific Div. of Bendix Aviation Corp. Mr. Perrine was formerly ass't mgr. and chief engineer of Consolidated Vultee Aircraft Corp.'s Pomona Div. Lionel Wittenberg, formerly remote supervisor for WCCO-TV, Minneapolis, has been named chief engineer of WTVW, Milwaukee. William W. Garstang has joined the Allen-Bradley Co. as chief engineer of the radio division. W. W. Garstang P. D. Williams the ALTEC LANSING Paul D. Williams has been appointed chief of ceramic development for Eitel - McCullough, Inc., San Bruno, Calif. electron tube mfr. Robert M. Floyd, Charles H. Schar - din, Luther W. Maples, Jr., Malcolm R. Currie, Howard T. Ozaki, Shirly LaVar Howard, Philip J. Fleeman and Alan Your final measure of audio quality is the monitor speaker. That is J. Schinnerer have joined the electrical engineering staff of Hughes Research & why the best quality is a must for monitor speakers in every AM, FM Development Labs. and TV station. You are sure of the best quality ... GUARANTEED quality ... with Altec's famous "Duplex" speakers. Altec guarantees Ralph L. Palmer has been appointed director of engineering of International these speakers will reproduce all of the tones from 30 cycles to Business Machines Corp. Also appointed 22,000 cycles when mounted in a properly designed cabinet. at I.B.M. was John C. Abrams to the Only Altec Lansing Corporation gives you this guarantee of quality. post of director of laboratory operations. ALTEC "Duplex" speakers give you the same high quality and Dr. Ragnar Thorensen has become director of research at Magnavox Corp. dependability as Altec broadcast consoles, Altec microphones and and will head the company's new re- amplifiers. Altec quality is quality you can trust! search and engineering lab. There are three Altec "Duplex" speakers to choose from: the 604C, Charles M. Young has been appointed manager of engineering at latest model of the famous Altec 604 "Duplex," 15", 35 watts continuous the General Electric Industrial and Transmitting power rating; the lighter 602A, 15", 20 watts continuous rating; and Tube Sub -Department in Schenectady, the 12" 601A with 20 watt power capacity ... all three guaranteed to succeed Albert C. Gable who has from 30 to 22,000 cycles ... the perfect monitor speakers. been named manager of product plan- ning for the sub -dept.'s marketing sec- tion. A SOUND REPUTATION SECOND TO NONE William C. Cothron has joined the technical sales staff of Prodelin, Inc., Kearny, N. J. C. J. Bachman has become Theatre ALTE C 9356 Santa Monica Blvd., Beverly Hills, Calif. Equipment Prods. Mgr. of Fairchild Re- LANCINO CORPORATION 161 Sixth Avenue, New York 13, New York cording Equipment, Whitestone, N. Y. (Continued on page 126) For product 124 information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Batahcíd- Line rpp,as irprriRn¡$ i VHF -UHF TUNABLE BALUN Used with the Admittance Meter and New High -Frequency Null Detector... makes possible accurate impedance, VSWR, gain and sen- System The G -R High -Frequency Measuring sitivity measurements on balanced systems is useful for many types of measurements converts grounded signal generators to signal sources on both balanced and unbalanced circuits. with balanced outputs Write for our bulletins describing measurement of attenuation as well as the Admittance Meter, Slotted Line, permits accurate Balun, High -Frequency Detector impedance of balanced twin -lead, twin -line, other tv trans- and many other instruments of the mission lines, and on tv receiver inputs and other com- G -R integrated line for work munication equipment. Write for the booklet "The at VHF and UHF. Measurement of Cable Characteristics" . determines VSWR introduced into 300 -ohm twin -lead by filters, lightning arrestors, etc. Tuning Elements plug in here facilitates measurement of inaccessible balanced circuits such as tv receiving antennas which cannot be connected directly to measuring equipment 50 -ohm coaxial line Type DNT Unit Oscillator High Frequency Null Detector Type 874 UB Balun Additional Sections of air line can be inserted here Balanced 1602-B Output Admittance Meter The Type 874 -UB Balun is a unique device for Type 1602-B Admittance Meter and Balun setup to measure admittance or imped- connecting from balanced to unbalanced systems ance of converter input. One Type 1208-A Unit Oscillator supplies the vhf powei . over a wide 54 to 1000 Mc range. The balanced while the local oscillator in the Type DNT Null Detector Assembly beats with the to unbalanced transformation is obtained by using Admittance Meter output to provide a 30 -Mc difference frequency. This signal is a semi -artificial, half-wave line made up of two detected by the new Type 1216-A Unit I -F Amplifier, also an element of the Null sections of 50 -ohm coaxial line and two shunt Detector Assembly. tuning elements. 874 -UB Balun $75.00 with appropriate local oscillators for cover - For use with the Balun age from 50 Mc to 950 Mc on fundamental The Balun is made tunable so that the best pos- 874-D50 Adjustable Stub (50 cm) 12.00 frequencies and to 5000 Mc using oscillator accuracy can be obtained at any frequency 874-L10 50 -ohm Coaxial Air Line harmonics ... $628 to $667 depending on sible (10 cm) 5.00 frequency range over its range. This unit is precision tooled and is 874-L20 50 -ohm Coaxial Air Line Unit Oscillators of the same high caliber workmanship which has 1 (20 cm) 5.50 1211-A 500 kc to 50 Mc $295.00 1602-B Admittance Meter 1215-B 50 to 250 Mc 190.00 become synonymous with the G -R trademark. and accessories 295.00 1208-A 65 to 500 Mc 190.00 Type DNT Detector Assembly ... available 1209-B 250 to 920 Mc 235.00 WE SELL DIRECT- Prices are net, FOB Cambridge or West Concord, Mass. SIGNAL GENERATORS GENERAL RADIO Company ADMITTANCE METERS MODULATION METERS 8. VIBRATION METERS AMPLIFIERS MOTOR CONTROLS SOUND STROBOSCOPES 275 Massachusetts Avenue, Cambridge 39, Massachusetts, U.S.A. COAXIAL ELEMENTS NULL DETECTORS TV 8 BROADCAST MONITORS DISTORTION METERS OSCILLATORS U -H -F MEASURING EQUIPMENT FREQUENCY MEASURING PARTS 8. ACCESSORIES APPARATUS P OL A R IS COP ES UNIT INSTRUMENTS 90 West Street NEW YORK 6 FREQUENCY STANDARDS PRECISION CAPACITORS VARIACS 8055 13th St., Silver Spring, Md. WASHINGTON, D. C. IMPEDANCE BRIDGES PULSE GENERATORS V -T VOLTMETERS ANALYZERS 920 S. Michigan Avenue CHICAGO 5 LIGHT METERS R -L -C DECADES WAVE WAVE FILTERS 1000 N. Seward Street LOS ANGELES 38 M EGO H M M ET ERS R -L -C STANDARDS HIGH GAIN INDUSTRIAL `e PERSONAL POCKETSCOPE (Continued from page 124) Arnold E. Linton has been promoted to the post of mgr. of the RCA tube mfg. plant at Woodbridge, N.J. by Hans Thurnauer has become tech- nical consultant on ceramics and elec- trical insulations for Minnesota Mining & Mfg. Co. In addition, he continues as vice president of American Lava Corp., a 3-M subsidiary. Arthur E. Harrison has assumed the position of director of engineering for Fairchild Guided Missiles Div. He was formerly vice-president in charge of engineering at Wilcox Electric Co., Kansas City, Mo. DC COUPLED 10 my/inch 1/2 CYCLE SWEEP A. E. Harrison K. C. Black Dr. K. C. Black has been appointed director of Raytheon Mfg. Co.'s com- munications and engineering dept. He was formerly business mgr. of Poly- technic Res. & Dev. Co. of Brooklyn, Size: 12" x 6" x 7" N. Y. 123/4 Pounds Lawrence A. Hyland has been ap- pointed vice president and general man- ANOTHER EXAMPLE OF-Traleiznuziz PIONEERING ager of Hughes Aircraft Co. Previous to ... accepting this position he was vice The HIGH GAIN POCKETSCOPE, model S-14-A, is an outstanding president in charge of engineering at achievement in the field of oscilloscopes. The high vertical and horizontal Bendix Aviation Corp. sensitivities of 10 and 15 millivolts rms/inch respectively; frequency re- sponses within -2 db from DC to 200 KC; non -frequency discriminating Dr. James Hillier has joined the re- attenuators and gain controls; plus individual calibration voltages are but a search and engineering staff of Radio few of the heretofore unobtainable characteristics of DC coupled oscil- loscopes. The sweep is Corp. of America as an administrative operated in either a repetitive or trigger mode over a engineer. His range from 0.5 cycles to beyond 50 KC with synchronization polarity office will be in the David optional. All this and portability too! The incredibly small size and light Sarnoff Research Center, Princeton, N.J. weight of the S -14-A now permits "on -the -spot" use of the oscilloscope in all industrial, medical, and electronic fields. Its rugged construction assures "laboratory performance" regardless of environment. WATERMAN PRODUCTS CO., INC. PHILADELPHIA 25, PA. CABLE ADDRESS POKETSCOPE WATERMAN PRODUCTS INCLUDE S -4-C SAR PULSESCOPEH S -5-A LAB PULSESCOPE S -6-A BROADBAND PULSESCOPE S -11-A INDUSTRIAL POCKETSCOPEI) J. Hillier R. D. Kell S -12-B JANized RAKSCOPE r. S -14-A HIGH GAIN POCKETSCOPE The Society of Motion Picture and S -14-B WIDE BAND POCKETSCOPE Television Engineers has named Ray S -15-A TWIN TUBE POCKETSCOPE D. Kell recipient of the 1954 David Sar- RAYONICR Cathode Ray Tubes noff Gold Medal Award. Mr. Kell is a and Other As,.ociated Equipment member of the TV research staff of WATERMAN PRODUCTS RCA Labs. 126 For product information, use inquiry card on last page.. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 FILTERED D -C POTENTIALS for accurate Gfil Weston Model 981 Prpportional Mutual Conductance Tubechecker measurements OUTSTANDING FEATURES: G,n MEASUREMENTS-G,,, measurements are made more accurately by using filtered d -c plate, screen THE grid and control grid potentials. A precision voltage divider network and selector switch allows a pro- portionate value of signal voltage to be chosen for testing tubes having transconductances up to 30,000 micromhos. Signal voltages of 5.2, 2.6, 1.3, and. 0.65 volts peak -to -peak having a fre- 980 quency of 5000 cycles are provided. LINE GRID BIAS, SCREEN GRID AND PLATE VOLTAGE: Filtered d -c potentials of 90, 130, and 220 volts are avail- able for plate and screen potentials. A variable PROPORTIONAL filtered d -c voltage in two ranges of 0-5 and 0-20 MUTUAL volts are used to obtain better resolution of Grid Bias settings. Far greater accuracy is obtain- CONDUCTANCE able with filtered d -c potentials than previ- ously possible in portable tubecheckers. TUBECHECKER METER MEASUREMENT OF HIGH LEAKAGE RESISTANCE- Since tube leakage as high as several megohms can cause poor performance in TV Receivers, this SEND COUPON TODAY FOR tubechecker is designed to provide an accurate COMPLETE DESCRIPTION AND PRICES meter measurement of leakage resistance as high as 5 megohms between tube elements, thus being particularly useful for TV servicing and TV line Weston Electrical Instrument Corporation production assembly. 614 Frelinghuysen Avenue Newark 5, New Jersey TWIN SECTION TUBES-Three toggle switches make it possible to rapidly check and compare the respec- Please send literature on the new 981 Tubechecker. tive sections of twin section tubes at only one setting of the selector switches. NAME ADDRESS WESTON 980 LINE TEST EQUIPMENT TT TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use incuiry card on last page. 127 jiiiiiiiiiiiiiii: BULLETINS Coaxial Cable Connectors Catalog 201, presents those coaxial connec- tors most frequently needed in standard ap- Better ...and Cheaper plications; also, special and difficult -to - produce items. Indexed cross-references and tabbed section pages. Illustrations ap- proximately actual size. Issued by Dage Electric Co., Inc., Beech Grove, Ind. (Ask for B-12-3) fÑIi/tfC011fr1dZe Phase Meter The Industrial Test Equipment Co., 55 E. 11th St., New York 3, N. Y. has a brochure available that covers the Model 200A phase because of meter. Gives principles of operation, features and specifications. (Ask for B-12-38) Isolators The new 8 -page Bulletin .541, issued by Barry Corp., 1000 Pleasant St., Watertown, Mass., gives information on the load ranges of the type 5200 shock and high vibration isolators designed for marine, transportation. UEROUOK and industrial applications. (Ask for B-12-39) Pilot Lamps A new brochure, Form L-155, on "Selection and Application of Pilot Lights," treats of ppJNTEU the subject in two main sections-pilot light lamps, and pilot light assemblies. Issued by Dialight Corp., 60 Stewart Ave., Brooklyn 37, N. Y. (Ask for B-12-33) Gas Analyzers WIRING Charles Englehard, Inc., 850 Passaic Ave., E. Newark. N. J., have released an illustrated brochure that discusses gas analyzers for thermal conductivity measurements. (Ask for B-12-34) An entirely new approach to dependable, long -life, econ- omical sliding contact devices. Made possible only by the Carrier Amplifier A new bulletin, issued by Consolidated unique Aerovox Printed Wiring technic. Engineering Corp., 300 N. Sierra Madre Villa, Pasadena, Calif.. covers the applications, Switches, commutators and other electro -mechanical assem- features, and specifications of the carrier amplifier system, Type 1-127. Technical in- blies can now be made with that ruggedness and high formation is also available on the Type can 3-122A 24 v. dc power supply and the Type performance which only solid silver contacts provide. 3-132 low voltage dc power supply. (Ask for Herewith are typical examples of such sliding contact seg- B-12-35) ments or stators. Life of several million cycles under TV various conditions. Closed Circuit "How To Read A Blueprint at 500 Feet," by Radio Corp. of America, Engineering Aerovox Printed Wiring for circuits, even including capaci- Products Div., Camden, N. J., describes the tance, inductance, shielding, and associated resistance simplicity and functions of "TV Eye," low- cost, closed-circuit TV equipment. Request elements, means metallic silver conductor mechanically form 3R2436. (Ask for B-12-36) formed and partially imbedded in phenolic base. No adhe- sive. No etching with resultant danger of acid or chemi- Magnets "Applied Magnetics," Vol. 2, No. 5, carries cal deterioration. No oxidation or tarnishing. No surface the article, "How Magnetic Testing Helps plating. reproducible due to precision printing Maintain Your Quality Standards," by Ger- Identically ald T. Barta, quality control manager of The process. Yes, obviously different! Indiana Steel Products Co., Valparaiso, Ind. Copies are available to readers who send re- quests to the company. (Ask for B-12-29) Frequency Meter A data sheet with accompanying technical ¿(dl4GLlQ/Ameteb% Yours for the asking. information, prepared by Colortone Elec- tronics, Inc., 238 William St., New York. Ako representative samples if you write on busi- N. Y., illustrates and describes the TS -175 ness stationery and indicate particular interest in A/U frequency meter. (Ask for B-12-30) switching, commutating or wiring applications. Let us quote on any requirements. Yoke Winder A catalog page illustrating and describing the new Model YW series deflection yoke winder was recently issued by Geo. Stevens ON Mfg., Co., Inc., Pulaski Rd. at Peterson, AERDV®-X Chicago 30, Ill. Gives complete technical CORPORATIf data. (Ask for B-12-31) IPiciAL PRODUCTS DIVISION NEW BEDFORD, MASS. Air Data Computer Hi -Q ACME CINEMA An 8 -page technical brochure released by DIVISION ELECTRONICS INC. ENGINEERING CO. Servo -mechanisms, Inc., Post & Stewart OLEAN, N. Y. MONROVIA, CALIF. BURBANK, CALIF. Aves., Westbury, N. Y. or 316 Washington St., El Segundo, Calif., discusses the "Master" air data computer and presents schematic LTD., Hamilton, Ont. diagrams showing how the plug-in type In Canada: AEROVOX CANADA computer solves complex calculations with a minimum of equipment. (Ask for B-12-32) 128 For product infoºmation, use inquiry card on lost page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Microwave Noise Generator A data sheet recently issued by Telechrome Inc., 88 Merrick Rd., Amityville, L. I., N. Y., describes the purpose and gives the specifi a- tions and features of the Model 1000 m cro- wave noise generator. (Ask for B-12-25) Kits The new 1955 Heath catalog contains 48 pages covering more than 55 kits-test in- struments, amateur equipment, Hi-Fi audio equipment, etc. Catalog contains complete specifications and schematics. Available on written request to Heath Co., 305 Territorial Rd., Benton Harbor, Mich. (Ask for B-12-26) "Quad-Kards" A four -page brochure released by Methode Mfg., Co., 2021 W. Churchill St., Chicago 47, Ill., presents engineering details and sug- gested applications for dimensionally stand- ardized printed circuit panels. (Ask for B-12-2) Printed Circuits CMS printed electrical circuits are discus- sed in a 2 -nage illustrated techn'cal data sheet that announces that additional in- formation is available at Cleveland Metal Specialties Co., 1753-83 E. 21st., Cleveland 14. O. (Ask for B-12-28.) Mass Spectrometer Bulletin CEC -1824A, prepared by CEC In- struments Inc., subsidiary of Consolidated En- gineering Corp., 300 N. Sierra Madre Villa, Meeting more Pasadena 15, Calif. describes and presents still of the12-21)-characteristics c'el 21 610 m ssespspectrometer. (Ask for B critical requirements .. . Transformers The 1954 "Stancor" catalog lists replace- ment and new equipment transformers with complete electrical and physical specifica- tions on over 500 units. Sixty-five-TV and exact duplicate auto vibrators-are listed for the first time. Chicago Standard Transformer Corp.. Addison and Elston, Chicago 18, Ill. (Ask for B-12-22) Hermetic Terminals Bulletin No. 5410, prepared by American PRECISION RESISTORS` Lava Corp., Chattanooga 5. Tenn., gives the latest information on "AlSiMag" metalized hermetic terminals. Includes property chart HERMETICALLY SEALED (Ask for B-12-23) i f MI71CtrllOo In "Lumiline" Screen GlhñrCD To the two previous types now in general use-Type CP Complete details covering the improved version of the "Lumiline" screen, used to (resin -film coated) and Type CPH (metal-cased)-there is now measure projectile speeds, etc., are available at Industrial Instruments, Inc., 89 Commerce Rd., Cedar Grove, N. J. (Ask for B-12-24) added the new Type CPC (ceramic -cased) Carbofilm. Thickness Tester Bulletin No. 159, prepared by Gardiner Here's the finest in precision resistors. Ceramic case with metallized Laboratory Inc., 4723 Elm St., Bethesda 14, Md., illustrates and describes the features of the "Handi-Gage," a pocket mag .et c end seals means permanent hermetical sealing. No capacitance thickness tester for electrodeposited, hot - dipped or painted coatings on steel. (Ask for B-12-17) effect between element and casing. Longest leakage path. Resistor Insulated body squeezes among other components without electrical Engineering Bulletin L-33, issued by Shall - cross Manufacturing Co., Collingdale, Pa., complications. Withstands extremes in humidity and temperature. gives charts, tables, and dimension on all performance characteristics of "Borohm" of ± 1%. Excellent stability boro -carbon resistors. Also discusses straight Guaranteed tolerance deposited -carbon resistors. (Ask for B-12-18) re. temperature and voltage coefficients, ageing, noise, etc. Military Television In 1/2, 1 and 2 watt sizes. Military Television is title of new booklet of unusual interest available from Dept. of Information, Radio Corp. of America, RCA Building, 30 Rockefeller Plaza. New York 20, Literature on request. Write on business letter - N. Y. The text, illustrated with photos and diagrams reviews the first public demonstra- Get the Facts ... head, stating particular precision -resistor in- tion of combat television at Ft. George G. terest, for sample. Let us quote. Meade, Maryland, August 11, 1954. (Ask for B-12-37) 'Reg. trade -mark CORPORAnON OBTAIN THESE BULLETINS q,EROVpX described here by writing on company OLEAN, N. Y. letterhead to Bulletins Editor, TELE - ACME CINEMA TECH & ELECTRONIC INDUSTRIES, H. - AEROVOX 480 Lexington Ave., New York 17, N.Y., CORPORATION ELECTRONICS, INC. ENGINEERING CO. listing numbers given at end of each DIVISION NEW BEDFORD, MASS MONROVIA, CALIF. BURBANK, CALIF. item of interest. Please mention title of In Canada: AEROVOX CANADA lTD., Hamilton, Ont. position held. !OBIER ADDRESS: 740 Belleville Ave., New Bedford, Mass. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 129 1 l' On Automatic Production (Carob/sled finas ye ye 116) Deposited Carbon Resistors for CCUR4t9aw C-1/4 - 1/4 Watt .For Miniature Installations ST.4ÖIUTY.t Dalohm deposited carbon re- resistance to abrasion. sistors are manufactured un- der rigid controls to deliver From 1 Ohm to 200 Megohms, Pre -punched PW boards are accurately located depending in metal pallets or frames in which they travel matchless performance and on type. from loading oc -2 station shown here through the economy in any high -low re- machine. Precision machining oaf pallets assures 2 W sistance range. Temperature coefficient 200 accurate board locating under inserting heads PPM per degree C for lower re- Dalohm resistors are sealed sistance ranges up to 500 PPM against moisture with special per degree C for higher ranges. silicone coating having high di -electric strength, excellent 1% accuracy. 2%, 5%, and Meet thermal conductivity, and high 10% tolerances also available. MIL -10509 - Write, Wire or Call Specification 1304 28th Ave. Phone 2139 DALE PRODUCTS, INC. Columbus, Nebraska, U.S.A, In Canada - Teletronics Corp., Ltd., Toronto and Montreal e"fr Each inserting station automatically feeds, prepares, and inserts components through pre - punched holes in p -w boards. Auxiliary lead straightening cad belting machine facilitates handling of components with pig -tail leads ea0222 CTA-5 250 -WAT T PAGING SERVICE 4 s e Inserting heads are readily adjustable and TRANSMITTER can insert cornparents. anywhere on p -w board Designed ro meet all cus- tomer and F.C.C. require- ments in the specially as- signed paging service bands of 35.58 and 43.58 megacycles. GATES RADIO COMPANY- Quincy, Illinois, U.S.A. Insertilg heads can also be used inde- pendently as bench -type units where Offices in: At anta, Houston. Los Angeles, NewYork and Washington. D.C. small volume or specialized nature does not justify use of cemplette machine 130 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC It DU54Ri'ES December 1954 Bob McClendon, 3907 Central Ave. E., Albuquerque, N. M. has been appointed rep in New Mexico and Ariz. for Cinema Engineering Co. Div. of Aero- vox. Wayne M. MacEachern has joined the staff of Tubergen Assoc., 2232 W. 11th St., Los Angeles, Calif. to handle office sales. D. Dolin Sales, with offices at 1200 N. Ashland Ave., Chicago, Ill., has been appointed Chicago industrial rep for Elco Corp., Philadelphia, Pa., and Robert T. Brown, Merchandise Mart, Electronics Research Engineer Irving Alne records radiation antenna patterns. Chicago, will handle jobber sales in Twenty-two foot plastic tower in background minimizes ground reflections, Chicago, and industrial sales in down- approximates free space. Pattern integrator, high gain amplifier, square root state Ill. Lowry & Dietrich Co., located amplifier and logarithmic amplifier shown in picture are of Lockheed design. at 1404 Swantek St., Pittsburgh, Pa., has been appointed to handle western Pa. and W. Va. jobber and industrial accounts. Antenna development program Norman B. Neely (1) head of Neely Enterprises, 7422 Melrose Ave., Los at Lockheed expands Angeles, Calif., an- nounces that his Lockheed's diversified development program presents Electronics Engineers firm has been ap- qualified for airborne antenna design with a wide range of assignments in pointed rep for the Industrial Div. of communication, navigation and microwaves. Antenna design is one of the Sanborn Co., mfr. fastest growing research and development areas at Lockheed. of oscillographic recording systems. Studies embrace virtually all types of aircraft, including the Super Con- stellation radar search plane type of aircraft developed and produced R. Donald Weir, sales rep for Audio -a Development Co. has moved his office exclusively by Lockheed. to 214 Main St., Hackensack, N. J., telephones DIamond 3-4118 and WIs- consin 7-2385. Career Positions at Lockheed Permoflux Corp., Chicago, Ill, has Lockheed's expanding development program has appointed E. Alvin Rich exclusive rep for Electronics for created a number of positions their line of speakers, headsets, Engineers and Physicists to perform advanced microphones in and transformers the work in antenna design. New England area. Mr. Rich's offices are at 49 Homestead Ave., W. Spring- Lockheed offers you increased salary rates now field, Mass. in effect; generous travel and moving allowances; an opportunity to enjoy Southern California life; Rockbar Corp., of New York has and an extremely wide range of employee bene- F. R. Zboril fits which add approximately 14% to each engi- Electronics Research Engineer become national distrib for Goodmans measures input impedance of a Industries Ltd. of England, manufac- neer's salary in the form of insurance, retirement scale model helical antenna array turer of loudspeakers. pension, sick leave with pay, etc. used for ground tracking of missiles. Those interested are invited to write E. W. Des Most of Lockheed's other antenna Dunvar Inc. of Chicago, Ill., has been Lauriers, Dept. TT -12, for a brochure describing work involves advanced research named midwestern rep for Condenser life and work at Lockheed and application form. studies on flush mounted antennas. Products Co., div. of New Haven Clock Co., Conn., and will handle that com- E. O. Richter, Electronics Research pany's line of capacitors, high voltage department manager (seated), power supplies and pulse forming W. R. Martin, antenna laboratory networks. group engineer (standing), and J. L. Rodgers, electronics research. At the last regular meeting, the fol- engineer, discuss design of lowing members were elected officers of corrugated surface antenna. the New York Radio & Television Square Club for the ensuing year: James I. Benjamin, Pres., Arthur J. Bauer, V.P., and Abe Schneiderman, LOCKHEED Secy. John J. Kopple, 60 E. 42nd St., AIRCRAFT CORPORATION New York 17, was chairman of the nominating committee. BURBANK CALIFORNIA Military Contract Awards (Continued from page 118) Dota Recording System -42,867-G M. Giannini & Co., Inc., 580 Fifth Ave., New York, N. Y. Test Set, multi-purpose-88,327-Hewlett-Pack- ard Co., 395 Page Mill Rd., Palo Alto, Calif. Handsets, telephone-76,600-United States In- strument Corp., 409 Broad St., Summit, N. J. Parts, controller assy-40,226-Chicago Aerial Survey Co., 1980 Hawthorne Ave., Melrose Park, Ill. Recorder -Reproducer -75,873, Webster Electric Co., Racine, Wis. Transformers, silicon-326,680-Texas Instru- ments, Inc., 6000 Lemmon Ave., Dallas 9, Texas. Tube, electron-41,172-Radio Corp- of America, Harrison, N. J. Tube, electron-222,288-Sperry Gyroscope Co., Div. of Sperry Corp., Great Neck, N. Y. Battery, dry-464,344-Ray-O-Vac Co., 212 E. Washington Ave., Madison, Wis. Battery, dry-558,351-Burgess Battery Co., Freeport, III. Battery, dry -289,620-P. R. Mallory & Co., Inc., 60 Elm St., N. Tarrytown, N. Y. Motor Generator Set-55,076-Regulator Equip- ment Corp., Paterson, N. J. Tube, electron-31,779-General Electric Co., Tube Dept., 1 River Rd., Schenectady, N. Y. ONLY Associates, 611 THE LEADER Tube, electron-103,008-Varian Hansen Way, Palo Alto, Calif. Tube, electron-78,750-Bomac Laboratories, Salem Rd., Beverly, Mass. always Tube, electron-27,525-Bomac Laboratories, Inc., Salem Rd., Beverly, Mass. Tube, electron-49,750-Sylvania Electric Prod- ucts, Inc., 1740 Broadway, New York, N. Y. steps Rectifiers-140,580-General Electric Co., Wyatt Bldg., 777 14th St., N. W., Washington, D. C. Test Unit-34,516-Mercury Manufacturing ahead Corp., Plant 2, Electronics Div., Fourth & Montjoy St., Falmouth, Ky. Receiving Sets, omni-range-149,872-Joppa Rd., Towson 4, Md. Transistors, infrared photo-245,148-Transitron Electronics Corp., 403-407 Main St., Melrose, Mass. In the parade of progress as in the Jamming Equipment-100,667-Melpor, Inc., manufacture of capacitors it 425 Swann Ave., Alexandria, Va. Computer -40,885--Reeves Instrument Corp., takes vision to lead. That is why, 215 E. 91st St., New York 28, N. Y. we, at Cornell-Dubilier, have proven Battery, dry-209,205-National Carbon Co., 30 E. 42nd St., New York 17, N. Y. our leadership with constant Radio Set-846,921-Western Electric Co., Inc., foresight ... by always being first 120 Broadway, New York, N. Y. Tube, electron-32,592-Radio Corp. of Amer- to develop new and more efficient ica, Tube Div., Harrison, N. Y. capacitors to Rectifier, power unit-202,792-The Siltronic meet tomorrow's Co., 3126 Fobes St., 3126 Pittsburgh 13, Pa. demands. Too, this vision has given Tube, electron-88,006-Sylvania Electric Prod- ucts, Inc., 1740 Broadway, New York 19, N. Y. Battery, dry-44,253-01in Matheison Chemical Corp., Electrical Div., 275 Winchester Ave., CD...45 YEARS OF FAMOUS FIRSTS New Haven 4, Conn. Jack, telephone-140,639-Conn. Telephone and Shown here are three examples of Electric Corp., 70 Britannia St., Meriden, Conn. C -D's "Famous Firsts" - proof that Battery, dry -304,171 -Ray -O -Vat Co., 212 whatever your capacitor require- Washington Ave., Madison 10, Wis. Meter-29,536-Revere Corp. of America, 845 ments, a C -D engineer can show you N. Colont Rd., Wallingford, Conn. money saving answers. Write to Amplifier-52,186-Chicago Aerial Survey Co., Cornell-Dubilier Electric Corp., 1980 Hawthorne Ave., Melrose Park, III. Dept. J124, South Plainfield, N. J. Regulator-61,298-General Electric Co., 1405 Locust St., Philadelphia, Pa. Radio Set-1,488,975-Lewyt Mfg. Corp., 60 There are more C -D capacitors postage stamp (Micados*) Broadway, Brooklyn 1, N. Y. in use mica capacitors. Tube, electron-25,556-Sylvania Electric Prod- today than any other make ucts, Inc., 1740 Broadway, New York, N. Y. Switchboard signal-13,100-North Electric Mfg. Co., 501 S. Market St., Galion, Ohio. Communication equipment, radio-60,363-Col- lins Radio Co., 855 -35th St., Cedar Rapids, la. C0RNELL-DuBILIER CAPACITORS Comparator Group-60,192-Vectron, Inc., PLANTS IN Waltham, Mass. SOUTH PLAINFIELD. N J . NEW BEDFORD. WORCESTER AND CAMBRIDGE, MASS.; PROVIDENCE AND HOPE VALLEY. R L. INDIANAPOLIS, IND SANFORD AND Relay-96,797-Phillips Control Corp., 59 W. FUOUAY SPRINGS. N. C., SUBSIDIARY. THE RADIART CORPORATION. CLEVELAND. O Washington St., Joliet, III. 132 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 (ano'her .AiíMag Extra) Se/'vice for more ECONOMICAL CERAMICS Our ;ample Order Depart- Careful study of designs by our engineering staff (with more ment can quickly make up than 50 years of specialized experience) often results in pieces to any new design recommendations which mean - Savings in manufacturing that looks promising and let costs, in speed and ease of assembly, Savings you test them thoroughly. Savings When the final design has through improved performance, Savings from combining been decided upon, parts two or more parts for still greater economy. can be produced to specifi- cation in volume to match your requirements. 53RD YEAR OF CERAMIC LEADERSHIP AMERICAN LAVA CORPORATION A blueprint or sample of your A SUBSIDIARY OF MINNESOTA MINING AND MANUFACTURING COMPANY present part with outline of op- CHATTANOOGA 5, TENNESSEE erating requirements will bring Branch offices in these cities (see your local telephone directory): Camb-idge, Mass. Chicago, Ill. Cleveland, Ohio Dallas -Houston, Texas prompt action . . . which may Indianapolis, Ind. Los Angeles, Calif. Newark, N. J. Philadelphia -Pittsburgh, Pa. save you lots of money. St. Louis, Mo. South San Francisco, Calif. « Syracuse, N. Y. Tulsa, Okla. Transistor Standard (Continued from page 91) in the schematic of Fig. 6. Coupling and differentiation is obtained by the .005 µf condensers. The transistor The Sigma Type 22 miniature double -pole sensitive is biased below cutoff so that the relay has now been made available with two new mounting output of one divider will just cause styles, as illustrated. The plug- in model requires no external conduction. If the output pulses from clamp. Brief specifications are given below. SPECIFICATIONS-TYPES 22KN, 22RJ and 22RJ2 DPDT-SPST Sensitivity . . 20 and 40 mw DC Contacts 2 amp., 28 V DC/110 V AC Resistive Coils . . . 10-16,000 ohms Also reliable in low level audio circuits i\nnN\ Temperature . -65° C. to 125° C. Life millions of cycles Vibration . . 10-55 cps, 20 g 10-2000 cps, 10 g (higher Hi -pot 1000 V DC g's available of reduced sensitivity.) Insulation resistance . 100 megohms Shock . . . 100 g Weight 31A ounces Acceleration , 100 g 11/4 1" x 1" x (double 7/77 Size header type) 1" x 1" x 2" (plug-in and round plan hook types) 1\7\7\7\ Fig. 7: (a-top) Normal emitter and base wave- forms of second divider. (b-bottom) Normal emitter and base waveforms of third divider More information is available on request. (Note: we suggest that those having immediate need of in- formation write instead of using the "Reader Inquiry .AM Service" supplied for convenience by this publica- tion, as processing and forwarding of the cards often causes some unavoidable delay.) Fig. 8: (a-top) Emitter and collector waveforms of coincidence circuit. (b-bottom) Collector waves of two circuits feeding coincidence stage both dividers arrive simultaneously, SI full output of slightly over 11 v is SIGMA INSTRUMENTS, INC. obtained for the duration of these 86 PEARL STREET, SO. BRAINTREE, BOSTON 85, MASS. pulses. See Fig. 8A, which shows a dual beam oscillogram of the coin- cidence transistor input and output. At first glance, it may seem that the oscillogram indicates that the tran- sistor is saturated except when co - 134 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 incidence occurs. However, it should he remembered that the base line of the collector waveform in Fig. 7A is -12 v and not zero. As temperature increases, I,. or collector current with no emitter current, increases. Thus, in order to maintain collector current cutoff, more bias current is required and is obtained through a thermistor whose resistance is an inverse function of temperature. tewv Conclusions The transistor low frequency standard delivers an 11 volt positive pulse into a low impedance load with an accuracy of better than 1 part in 10' from -40 degrees F to +140° F. Transistor selection is necessary, particularly of point contact units used in the divider circuits if opti- mum results are to be obtained. Almost any junction transistor can be used providing it supplies the desired gain. Elgin Buys Neomatic Elgin National Watch Company has announced that it has entered the fast growing West Coast elec- tronics manufacturing field with the outright purchase of Neomatic, Inc., specialists in development of minia- ture electronic components. The ac- quisition marks Elgin's first major step in product diversification since the company announced late in 1953 its intention of entering the growth fields of miniature electronic com- ponents and automatic production . Sarkes Tarzian Centre-Kooled instruments. Neomatic's plant has concentrated on special purpose re- Selenium Rectifiers give years of lay switches. trouble -free, maintenance -free service. Write for complete 16mm Magnetic Sound information. for Video Film In a technical paper delivered be- Tarzian, Inc., fore the 76th semi-annual conven- Sarkes tion of SMPTE, Edward Schmidt of RECTIFIER DIVISION Reeves Soundcraft, Inc., New York, new "Magnastriper" described the DEPT. T-6, 415 N. COLLEGE AVE., BLOOMINGTON, IND. equipment as the 16mm version of Toronto Tel. Murray 7535 the 35mm equipment which produces In Canada: 700 Weston Rd., 9, the magnetic stereophonic sound on Export-Ad. Auriema, Inc., N.Y.C. CinemaScope motion pictures. Wide- spread use of the new equipment in the television industry was foreseen. Speed of operation permits commer- cial quantities of striping, at least 10,000 ft., eight -hour day. It permits $,arkes Ko-eta handling of all three types of 16mm magnetic striping, including double SELENIUM RECTIFIERS perforated, 100 rail, and half -stripe Tarzian single perforated films. For product information, use inquiry card on last page. 135 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 I -F Transformers (Continued from page 87) the Q of the coil was greatly influ- enced by the position of the slug. Also, the coefficient of coupling was affected by the slug position. As a result, it was practically impossible to reproduce the transformers to closely controlled bandwidths. The resonant impedance of the coil and capacitor alone was roughly 25,000 ohms. The 68,000 ohm resistor EIMAL Fig. 3: (I) 1-F transformer construction details, Vacuum showing toroidal coil and resistors. Fig. 4: (r) View showing unit's plunger capacitor shunted the resonant impedance re- Switches sulting in a net impedance of 18,000 ohms. The composition loading re- sistor was in itself guilty of unde- sirable effects. For one thing, there is as much as 25% discrepancy be- tween the effective r -f resistance and for high voltage, airborne service the do resistance, the actual value of this discrepancy varying with the manufacturer, wattage, and so on so Compact, fast action Eimac vacuum switches are custom that unless each resistor is measured, designed for high voltage application. Single pole, double the loaded Q is quite unpredictable. The fact that the resistor was more throw action contacts are precision spaced in high vacuum, stable than the resonant impedance permitting reliable performance regardless of ambient of the coil suggested the corrective technique to reduce the temperature atmospheric conditions. In antenna switching service, RF effects. In the case of the first trans- peak potentials as high as 20kv may be applied between formers the coil represented the the switch terminals. Eimac vacuum switches are not limited lower impedance than the resistor, hence the temperature coefficient of to this service, however, as they will handle 1.5 amps at impedance of the loaded resonant 5kv in DC switching. Efficient operation in severe airborne circuit was primarily controlled by the coil. If the resonant impedance conditions, small size and instant response these give switches of the coil could be made higher by a distinct advantage over conventional relays. Now avail- increasing the Q, a lower value of able are four Eimac switch types, including one for pulse shunt resistor could be used to re- store the design Q of 50. service. After some experimentation, a coil For further information contact our was wound on a powdered iron toro- Application Engineering department idal form which had a Q of 150. In- stead of 68,000 ohms of loading re- sistance, a 30,000 ohm loading resis- tor was required across the coil to EITEL-McCULLOUGH, INC. obtain the design Q of 50. In this case SAN B R U N O, CALIFORNIA the resonant impedance of the un- The World's Largest Manufacturer of Transmitting Tubes loaded coil is 50,000 ohms and this impedance when shunted by 30,000 For product information, use inquiry card 136 on lost paye. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 ohms is exactly equivalent to the Encapsulated Type 380 18,000 ohm impedance of the original transformer. Obviously, this change Open Type 380 is a step in the right direction since AVAILABLE the temperature coefficient of the re- FROM STOCK sistor is now dominant. As a divi- dend of this toroidal coil arrange- r1i ment, the temperature coefficient of the unloaded Q was found to be only Ms as great as the temperature coeffi- cient of the slug -tuned solenoid coil. In addition, the toroid is not affected by the proximity of a nearby metal shield. These benefits outweigh the higher unit cost of the toroid. Resistor Characteristics Delay The gain stability was now virtu- ally dependent on the stability of the loading resistor. Considerable exper- imentation was conducted to deter- mine the best type of resistor for use Lines as the loaçling element. Deposited carbon film type resistors were found to be vastly superior to composition resistors for two reasons: the resist- ...STOCK TYPES FOR QUICK DELIVERIES ance changed only about 3% over a 100° C temperature range instead of ...SAMPLES AND "SPECIALS" TO the 6% change in the composition EXACT SPECIFICATIONS type. But equally important is the fact that the do resistance and the r -f resistance are one and the same so that loading resistors may be calcu- lated and installed without individu - As engineering specialists in both wire winding and electronic equipment assemblies, Shallcross offers complete facilities for the design and large- scale production of delay lines in a variety of open and encapsulated styles for both highly critical as well as commercial uses. Typical applications include use as compensating delays for color television, in signal delays for TV synchronizing signal generators, and in wideband distributed -type amplifiers. Now available for prompt delivery is the Shallcross open -type 380 described below. This is a typical lumped parameter delay line using silvered mica capacitors conforming to JAN Style CM -15, Char- acteristic E. Many other types can be readily designed for specific applications.; Quick delivery of proto- types! Send your specifications for prompt consider- ation by Shallcross engineers. SHALLCROSS MFG. CO., 518 Pusey Avenue, Collingdale, Pa. Fig. Top i 5: view of -f transformer SHALLCROSS TYPE 380 DELAY LINE SIZE: Open Type: 2+y4" x lyz" x sÁ16" ally measuring the effective r -f Encapsulated Type: 21/4" x 1" x 1" characteristics, with assurance that ELECTRICAL CHARACTERISTICS: the resultant Q will be within a few Maximum pulse voltage: ± 100 volts percent of the design value. A still Rise time: 0.04 microseconds Total delay: 0.3 ± 0.03 microseconds more stable resistor is the boron - Impedance: 500 ohms carbon film type which was found to Cut-off frequency: 8.5 megacycles change resistance less than 1% over the same 100° C temperature range. In addition, since it is a film type resistor, it retains all the other bene- fits of the deposited carbon resistors. Model Transformer A transformer was constructed with two toroids and boron -carbon loading resistors. Both circuits were page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last 137 I -F Transformers (Continued from page 137) capacity tuned with plunger type ca- pacitors so that tuning adjustments have no effect on the coefficient of coupling. Capacity coupling is used between primary and secondary. This transformer may be seen in Figs. 1, 3, 4 and 5. This transformer measures 1 in. square by 15/8 in. high. The assembly is hermetically sealed. The construction is very rigid mechanically. The coupling capacity is approximately 1 µµf and since the bandwidth was to be controlled to within 2% in the development mod- els, a 1 -in. length of plastic encased twin -lead of a type frequently used in winding bifilar coils was installed for the coupling capacity. This ca- pacitor is trimmed to the desired bandwidth with the transformer in- stalled in a test jig. Of course, if the bandwidth tolerance is relaxed, a fixed coupling capacity may be used. An amplifier using three of these transformers was constructed and evaluated. It was found that no gain change could be measured over a 125° C temperature range when test- ing under the same conditions which had shown a 2 to 1 change in i -f gain with the original solenoid type trans- formers. In addition, the response curve maintained its shape and sym- metry. VACUUM JENNINGS CAPACITORS ARE BEING Vehicular Transportation USED IN THESE VHF AND UHF APPLICATIONS (Continued from page 96) self as a suitable instrument for 1/ Tank and antenna tuning capacitors is TV transmitters simulating railroad shocks originat- ing from rail joint discontinuities. It Y Feed -through capacitors for harmonic attenuation on power was found that the three table supplies speeds, 240, 270 and 285 rpm, consti- tute a satisfactory simulation of dif- Y Pulse shaping capacitors in the output circuit of magnetrons ferent train speeds. Parts of "go" 1/ RF bypass capacitors and "no go" Signal Corps tests, therefore, require equipment and The years of patient research and development work at Jennings has made components to be subjected to these possible practical, stable, and efficient miniaturized vacuum capacitors for table speeds. The highest and lowest the VHF and UHF fields. Their vacuum dielectric and aLl-copper construction speed were selected for the compari- result in high power ratings, small physical size, and extremely wide ca- son test between the Package Tester pacity ranges. They are thoroughly outgassed so that they are not damaged and the wheeled vehicle. by moderate overloads that cause internal arcing. Therefore, where high power requirements at high frequencies have created difficult problems for other types of capacitors, consider utilizing the inher- Package Tester Results ent advantages of these new fixed and variable capacitors with a vacuum dielectric! Figs. 11 & 12 present the results obtained on the Package Tester. The Send for our catalogue summary, or let us send transit case and the shock mounts you specific recommendations with respect to provide protection for the electronic _ sarc.ro ° J your capacitor problems. equipment, since the total accelera- tion values are smaller when the equipment is packed in the transit JENNINGS RADIO MANUFACTURING CORPORATION 970 McLAUGHLIN AVE. case. Because of the filter action of P. O. BOX 1278 SAN JOSE 8, CALIFORNIA the shock mounts, the frequency distribution is shifted and the shocks 138 For product + nfnrmation, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 are amplified below 150 cps; how- ever, a second peak in the accelera - `,IVIilll//í//// tien curve occurs at about 370 cps A Acceleration vs Frequency º4 Equipment without tronsit cad on pockcge teste BRIGHT FUTURE Cs, Rd Tsai. SPEED j _._. 240 BPB TABLE SPEED. IN 10 ORIGINAL RESEARCH aq , PEcuE Bcv cps Fig. 11: Spectrum of equipment without transit case measured on package tester FOR ºB ELECTRONIC ENGINEERS Acceleration vs Frequency º4 Equipment with s00ekimounte0 transit cose on package tester r NA PHYSICISTS and o SIB 2$S BPY TABLE SPEED I 040 Bes TABLE SPEED MECHANICAL ENGINEERS 41111111\1 /1 r MIiIalpNUI i r SYLVÄNIA 100 FBEAu[Bc . cps It is not surprising that many contributions and advances Fig. 12: Spectrum of equipment in shock in the field of electronics have been made by Sylvania mounted case measured on package tester engineers. Our company has always placed heavy empha- sis on original research, development and product design, (see Fig. 12). This peak indicates offering engineers wide latitude for exploration and that higher modes were excited, creative expression. probably due to the rocking action As a result, growth opportunities for engineers are vir- which the equipment is subjected to tually unlimited, as Sylvania aggressively advances in its on the package tester table. growth tradition. Comparison of Figs. 10, 11 and 12 To aid our engineers in their progress, Sylvania also pro- reveals that the conditions encoun- vides financial support for advanced education, as well as tered on the package tester are dif- liberal insurance, pension and medical programs. ferent from those on the vehicle. It is that the table speed of 285 obvious The following PERMANENT POSITIONS are now open at: rpm is too high since the overall ac- celerations are considerably in ex- BOSTON & BUFFALO ENGINEERING LABORATORIES cess of those measured on the ve- -in -Charge, Senior Engineers, En- hicle. Section Heads, Engineers gineering Specialists and Junior Engineers for Research, De- sign, Development and Product Design on complex sub - Overall Acceleration miniaturized airborne electronic equipment and computers, At 240 rpm table speed, the overall experienced in: acceleration encountered by the tPulse Techniques Analytical Problems equipment without transit case is Electro -Mechanisms Antenna Design Microwave Techniques Applied Physics approximately equal to the accelera- Microwave Applications tion measured on the vehicle (19 g Circuit Design Systems Development and 21 g). But due to the higher Equipment Specifications & Testing modes excited on the package tester, F. M. Techniques Component Selection Miniaturization Component Analysis the spectrum is different and thus Servo Mechanisms & Testing the overall accelerations applied to ' Transistors Component Specifications the equipment when it is packed in Heat Transfer Digital Computer Circuits the transit case differ considerably Shock & Vibration & Systems Technical Writing Mechanical Design (15 g versus 11 g).. For better coordination between vehicle and package tester, it is Please forward complete resume to: necessary to change the operating COL. CHARLES KEPPLE conditions of the package tester; this probably could be done by decreas- ing its speed and increasing its SYLVANIAA stroke. ELECTRIC PRODUCTS INC. The authors wish to acknowledge the 175 Great Arrow Avenue, Buffalo, New York assistance rendered by Mr. H. K. Webber, Coles Signal Laboratory, SCEL, during the conductance of the tests. For product information, use inquiry card on last page. 139 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Deflecting Coils Electronic (Continued from page 83) field turns out to be a squared cosine law. Engineers Up to now, we have considered only the fields due to the active parts of the coils, that is the parts of the wires which lie parallel to the axis of the picture tube. Unfortunately the coils comprise The we men seek are experts in their a part that is bent around the tube specialized fields; capable of filling neck, the so-called "ends." Those responsible engineering positions ends are entirely unnecessary for with MELPAR, a leader in research the deflection itself, and create mag- and development. Perhaps one of netic fields which interfere with the these men may be you. We invite deflecting field and introduce un- you to learn about our long-range Network Theory Microwave Techniques wanted distortions. military and industrial programs. UHF, VHF or SHF Receivers To reduce this end -effect, it is cus- Digital Computers If you are experienced in one or tomary that the ends of the coils Magnetic Tape Handling Equipment more of the fields listed, write us Radar and Countermeasures be bent up and away from the tube about yourself, and let us tell you Microwave Filtern neck, but this results in longer wires Flight during a personal interview about Simulators and more copper. The efficiency falls Subminiaturization Techniques then to 30 or 25% with yokes of our past record of success and how Electra -Mechanical the Design types 2b 2c. As you can successfully fit into our Packaging Electronic Equipment or the outside (leak- future plans. Photographic Equipment Design age) flux of a well designed coil is of the order of 10 to 15%, it will be Technical Personnel Representative seen that the total loss is of the order of 60% of the energy delivered to rnelpar, inc. the yoke. A Subsidiary of the Westinghouse Air Broke Co. Another point is worth mention- 452 Swann Ave., Dept. TT -12, Alexandria, Virginia ing; it relates to the manufacturing or 11 Galen St., Watertown, Mass. difficulties of the ordinary types of deflecting coils. Unavoidable dis- crepancies will lead to marked vari- Silicone Gasket Te{ton Insulation Cable Clomp ations in the distortions produced. Field Measuring Apparatus A detailed investigation of the field inside the yoke was made with the help of the apparatus shown in the photograph. It consists essentially of a probe to measure the magnetic field inten- sity, and a means of supporting and moving yoke, Center Conductor Clamping Nut the through which is UG-88 C/U Bayonet Locking sent a current. TYPE BNC The Sleeve NO. A-100-813 displacement of the yoke is DAGE precisely controlled, and the plotting of the fields is carried on in the usual manner, according to the three axes Design with Dage! shown in Fig. 3. For example, an ordinary yoke, type 2b or 2c, gives the of Dage engineers are interested in your serves. Dage expertly designs, carefully fields design problems . . even before you have makes all types of RF connectors includ- Figs. 3a, 3b, and 3c. them! Call on Dage at the very beginning ing Type N, C, BNC, improved BNC's It is evident that a coil of the usual of your next project-see for yourself how and SM's. Dage designers are specialists shape, shown in Fig. 4a, cannot be skillfully Dage can help you coordinate in producing your special connectors. entirely free from end details and overcome design "bugs." Remember, on your effects. The next project-"De- radical way to eliminate Your RF connector order placed with sign with Dage"; call Dage ... even be- the end Dage receives the careful attention it de- fore you start! effects would be to eliminate the ends. This might sound silly, since UG-88 C/U the wire of the windings must be TYPE BNC Write Doge today for your continuous to allow the current to DAGE NO. A-100-813 copy of Catalog 201. pass, and a connection is necessary Write, phone or wire your between any two active side wires. RF connector order to But it is not so silly when one comes Doge today! to consider new forms of winding entirely different from Fig. 4a, and for example the form given Fig. 4b DAGE ELECTRIC COMPANY, INC., 67 NORTH SECOND STREET, BEECH GROVE, IND. which can be considered as two in - For product information, use 140 inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 terlaced elliptical coils. Before bending, such a set of coils, plane wound, looks like Fig. 4c. The directions of the currents are given by the arrows, and it will be seen that all the wire is active and that another Raypar first the currents combine two by two to give a conventional deflecting field. The important point is that there are no ends, and hence no end ef- fects. The mapping of the field for the crossed -fields coils is shown in Figs. 5a, b, c, with reference to Fig. 5 to identify the axes and the points of measurement. Advantages of the New Coils Comparison between Figs. 3c and 5c will show the difference between the two types of coils. It will be specially noticed how all end effect is absent on the right of Fig. 5c. The spot shape is, for the same reason, much better with the new coils. The gain in energy is also important: for the deflection a same angle, conven- for 1X2 type tubes tional coil has an average length per turn of 19 in., and an elliptical coil of only 14 in. This represents a 25(, improvement. The efficiency of the crossed -fields coils is higher because the losses are smaller, and also because the field is much more usefully distributed in- side the tube neck; this last point is supported by comparison between for 1B3 type tubes Figs. 3a and 5a. To give an idea of the improve- 'patent applied for ment, a cross -fields yoke without core gives the came deflection as a conventional yoke with a high permeability ferrite core. Printed Crossed -fields Coils A very important thing, from a practical point of view, is that the For 30,000 Volt OPERATION. new type of coils is particularly suited to printing methods, espe- Underwriters Lcborctories approved. cially for coils of medium or high Molded of shock -proof, mica -filled phenolic. impedances. This is due to the pe- Ample room for bui_t-in network. culiar shape of the coils, which can Simple, easy feed--.1-au of high voltage leads eliminates be easily flat printed and then chassis grommets. wrapped without a difficulty around Available with or without corona ring. cylindrical tube, or even the picture tube itself. For low voltage operation, these tube sockets can be The self -capacity of the coils is molded of econom_cal paper resin phenolics. very small, and this is highly im- Socket can be supplied for elevated or submerged portant. The use of a sheet plastic mounting. insulating support, such as vinylite or teflon, ensures easy and cheap manufacture and guarantees suffi- cient insulation. The total bulk of the deflecting yoke becomes very small indeed, and in no way comparable to the conventional unit. This, joined with INCORPORATED electrostatic focus picture tubes, IRAY1PM( 7800 WEST ADDISON STREET CHICAGO 34, ILLINOIS should result in a Ng saving of use- ful space around the neck of the tube. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 141 LARGE -CAPACITY Voltage Doubling HIGH -VACUUM DUO -SEAL PUMP (Continued from page 81) resistance of what amounts to the GUARANTEED VACUUM 0.0001 mm Hg. or 0.1 Micron 0.41 volt meter are shown in the ex- treme right-hand column of Tab'e FREE AIR CAPACITY 140 Liters Per Min. 1. The values shown are those found by the voltage -doubling method seen is not precise for FASTER PUMPING which we have QUIET OPERATION rectifier -type instruments. At any VISIBLE OIL LEVEL COMPACT DESIGN given point, double the resistance to decade Overall required to be added the dimensions for pump and minus the total resistance in the motor 151/2" high and 11" wide x give the 19%" long. decade should, therefore, resistance of the rectifier-meter 1402B. DUO -SEAL PUMP. MOTOR - combination. Apparently nothing DRIVEN. A No. 1402 Pump mounted on o precise can be accomplished by de- base with a 1/2 H.P. 115 -volt A.C. motor. Complete with pulleys, belt, and cord. termining the resistance of the rec- Each $295.00 tifier -meter combination only. 1402G. BELT GUARD for 1402B Duo -Seal Pump ...... Each $15.00 Determining Itesistanee 1402. DUO -SEAL TWO STAGE VACUUM It would be possible to accurately PUMP. Pump unit only not mounted on a base, but with a 10 -inch grooved pulley, determine the resistance of a recti- a supply of oil, and directions for use. fier -type instrument by means of an Each $225.00 ac microammeter which would ac- curately indicate actual rms values 148 -Page Booklet on Welch Duo -Seal Pumps has just been issued. and which was provided with a A complete description, including performance curves of the Duo - Seal Pumps ranging from 21 liters per minute to 375 liters per graph showing terminal voltage drop minute, is given, os well as a greatly enlarged listing of Diffusion at all scale positions. Suppose that Pumps, Vacuum Gauges and accessories. by such means we had determined the resistance of our 0.41 volt meter ntturtrs is W. M. WELCH SCIENTIFIC COMPANY to be the 1,510 ohms as estimated in DIVISION OF W. M. WELCH MANUFACTURING COMPANY the above tabulation. Such a de- ESTABLISHED 1880 nb0tnf`c1 rytrtAp4ntntus termination would be useless, be- 1515 Sedgwick St., Dept. J, Chicago 10, Illinois, U.S.A. cause it would imply that multiplier resistance would be required on the HEADQUARTERS FOR basis of 3,683 ohms per volt, or that 1,510 ohms would need to be added CONTINUOUSLY VARIABLE TIME DELAY LINES to make a 0.82 volt meter. As a more practical example, take 5 X 10-1° SECONDS 10 Different models avail- the military specification for VU RESOLUTION TIME able with time delays of 0 to 0-0.75 us and imped- meters from JAN -I-6. Here it is OVER 15 MC BANDWIDTH ance of 180 ohms to 580 specified that the internal resistance FOR PHASE SHIFT IN COLOR TV ohms. Rise time less than of the instrument must be 3,900 10% of the time delay at 5% zero FOR PHASE CORRECTION IN any point. Price $59.00 ohms plus or minus at the VIDEO CIRCUITS each. F.O.B., Passaic, N.J. VU scale mark. An external resistor TYPE 505 of 3,600 ohms, plus or minus 0.5% CONTINUOUSLY VARIABLE PASSIVE NETWORK: Time delay from 0 to 11 micro- is used to make the zero VU mark seconds with 6 x 10-10 Sec. resolution time. Type 2011-$245. each. Type 303 (11 models)- $144. each. represent 1.228 volts. In actual VU STEP VARIABLE DELAY LINES: Equal input and output impedance available with maximum delay of 2.2 us to 10 us. meters, the terminal voltage drop ap- WRITE FOR DATA! proximates 0.6 volt and from the ADVANCE ELECTRONICS CO., INC. 451 HIGHLAND AVE., PASSAIC, N.J. above tabulation, it is clear that the error of the voltage -doubling method at this voltage level could Advantages approximate 5%. Also, as the error Extreme flexibility increases as the current level is de- Fast quiet switching creased, and since 3,900 ohms at 0.6 Crosstalk down 60 Db at 10 MC volt corresponds to something un- Any group of setups may be held der 160 lia, it becomes quite clear intact while setting up others why it is most difficult to make an Provision for spot or remote control instrument, which the voltage -dou- Strapwiring eliminated bling method will pass as between Individual magnets at Excellent HF characteristics 3,705 and 4,095 ohms, and which will crossbar each cross -over. Palladium contacts still indicate zero VU with 1.228 A truly superior switch Reduced cost Maximum, six conductors volts applied through a 3,600 ohm for Compact design, small size per circuit. external resistor. MASTER CONTROL AND MONITOR SWITCHING OF low operating power -2.5 watts Life -tested to 100 million It is the writer's considered opinion AUDIO Z VIDEO CIRCUITS Simple "package" installation operations. that in the light of the foregoing Also findings, the Military would be wise COMPUTERS TELEMETERING INC. JAMES CUNNINGHAM, SON & CO., to set up a more realistic specifica- TELEPHONY DELAY LINES Dept. T-1, Rochester, New York Tel: BAker 7240 ETC. tion for rectifier -type instruments 142 For product Information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 wherein all reference to resistance and/or the voltage -doubling method would be omitted. It should be noted with reference to Fig. 2 that the shapes of curves A and C were plotted in the range of 0 to 2% of the full current rating of the rectifier and in the current range most usually employed in current rectifier -type instruments. If the rectifier is operated at a higher cur- rent output, both A and C will tend toward the sine of curve B, but even with operation at full current 1: ad, A and C cannot completely conform BOR ROTOR __- to curve B. Printed Circuit Artwork (Continued from page 97) PAIO the drafting machine. Squareness, or rather the lack of same, can cause severe problems in preparing mul- HELP KEEP CDR ROTORS tiple negatives. Don't count on your drafting machine being square. THE Check it before each job, and again ON BEAM! after each job, and even during the The famous C.D.R. completely automatic work. Keep it square. Better yet, get rotor provides roof top magic for the ever a large triangle, and stick to a Jacobs rule for your work. Drafting ma- growing American family of TV viewers ... chines are very risky. Phalo Cords, playing their usual steady role The use of graph paper is another in the "current" picture, help makes C.D.R.'s excellent way of assuring squareness performance record a thing of envy from and accuracy, if you know its short- coast -to comings. Graph paper ruled in deci- -coast. mal and in fraction form is available Phalo Cords come in standard colors or in in sheets and in rolls. If printed with matched color Cord-O-Nates. Get details a faint blue line it can be drawn on . . . product is power directly, then inked and used as fin- make sure your ished art work. Here you must be supplied with the finest! Despite careful, however. the claims The C.D.R. Rotor is a of extreme accuracy made by its product of The suppliers, we have found graph pa- Radiart Corporation, per to be off in dimension quite a Cleveland, Ohio. bit, and to vary from sheet to sheet. Check your paper before you use it, No. 18 SPT 1 with M64A plug and see if it is accurate enough. r and SR64 molded strain relief Artwork Size PHALO PLASTICS CORPORATION 21-25 FOSTER ST., WORCESTER, MASS. how big should work be, Southern Plant: Monticello, Miss. Just art Cord Set Assemblies and just how many times larger than Insulated Wire and Cables - finished result should it be? Here we can settle things by saying, the larger the scale the better, but never allow a piece of art work to exceed 20x30 in.; never draw it larger than five times actual size; and never ask that it be increased in size by more Have you seen than 2: 1. Your size limitations are controlled by the type of copy hold- ers supplied with process cameras, and the scaling abilities of the cam- era itself. The most popular camera CORNING'S NEW PRICES now in use has the limitations set forth above. As long as you stay within the limits set above, keep on Film -Type Resistors? your copy as large as possible, since, as it is scaled down, the inevitable inaccuracies of your drawing shrink right along with the scaling down of For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 143 Printed Circuit Artwork (Continued from page 143) the layout. Too often we hear drafts- men tell us all about their abilities to draw to plus or minus 0.010, and all too often we find it running closer to 1/32 in. by the time it is inked. This does not make for good rela- tions between design engineers and printed circuit producers. Many printed circuit companies have different ideas as to just how trim lines should be put on draw- ings. There is only one way to keep them all happy; let them put them capacitance on themselves. This is done readily attenuation by drawing your trim line with a & sharp blue pencil, lightly enough not LOW to destroy the paper's surface, and TYPE iu;u eft IMPED.n O.D. heavy enough to be seen. Your sup- Larg A C 1 7.3 150 .36' plier can then put the actual trim WE ARE SPECIALLY ORGANIZED C11 6.3 173 .36' TO HANDLE DIRECT ORDERS OR lines, which will print, as he sees C 2 6.3 171 .44' ENQUIRIES FROM OVERSEAS best. Here is a good place for that C 22 5.5 184 .44' one SPOT DELIVERIES FOR U.S. C 3 5.4 197 .64' accurate dimension; take the BILLED IN DOLLARS- C 33 4.8 220 .64' longest side of the trim lines, and SETTLEMENT BY YOUR CHECK C 4 4.6 229 1.03' put the dimension here. Keep the TRAIVs CABLE OR AIRMAIL TODAY C 44 4.1 252 1.03' dimension in blue pencil too, and you will save the darkroom a re- touching job. RAMC, N L w 'MX and SM' SUBMINIATURE CONNECTORS Constant 50n 63n 70n impedances Corrections TRANSRADIO LTD.138A Cromwell Rd. London SW7 ENGLAND CABLES: TRANSOM LONDON Many a piece of otherwise perfect copy suffers from careless correction of errors. To correct an error, it is best to paint it out with Chinese Librascope read -record heads are white opaque water color, of white designed for recording and read- poster paint. Whatever you use, it ing on magnetic drums or other must be absolutely opaque. (It is magnetic storage systems and best to get special photographic consist of a center -tapped coil opaque white.) If you wish, you may wound on a toroidal core and paste in a new area, but you must molded into a temperature -stable also paint the edges of the pasted -in epoxy resin package %" long. piece with opaque white, or lines Optimum read -back signal at high will appear in the finished negative. frequencies is made possible by Do not use translucent paper as a sintered ferrite core, a winding paste -in piece, and expect a good with low distributed capacity job. The powerful lights used in pho- and with back gap eliminated. tographing the copy burn right Positioning dowel hole permits through the paper, and it might as precise mounting. All heads sub- well not have been put there at all. jected to 1200 volt RMS high If slip you must, and we all do, do potential test. Write for catalog. a good opaque-ing job and you'll be glad you did, as will your supplier. SPECIFICATIONS: Crosstalk limited to minus 60 Db for adjacent Art Work Final Form heads. Resonant frequency have made circuits above 500 KC We from ev- Track width: .090 in. erything-from original inked art Gap width: .0015 in. work to faded blue prints. Naturally the worse the copy supplied, the more retouching necessary, and the Computers and Controls poorer the finished piece. Even pho- tostats, unless they are of the so- called "reproduction" type, do not give the same results as a piece of original art -work. Your circuit sup- 1607 FLOWER ST., GLENDALE, CALIF. plier, or his photographer can do a lot better job if you give him origi- nal art. For product information, use Inquiry 144 card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Abrasive Process (Continued from page 99) "P" SERIES tions to which the process lends it- . self involve the cutting and abrad- ing of hard, brittle substances. The ilo. 1-3618: Overall: 421//" x 22" x 18" wide latitude of control that can be Panel Space: 363/a" x 19" maintained makes the process favor- 4o. 1.6618: Overall: 673/e" x 22" x 18" able to a wide variety of jobs, which Panel Space: 611/4" x 19" alo. 1.8318: Overall: 83'/e" x 22" x 18" range from "pin -point" deburring or Panel Space: 77" x 19" cutting glass where relatively small Far -Metal "P" Series Racks are amounts of material are to be re- cvaPable on special request up moved. to 28" deep. For instance, one manufacturer was faced with the problem of re- : G" SERIES on the inside of moving small burrs . t II i i t stainless steel 0.035 -in. diameter No. 3.2218: Overall: 761/e" x 22" x 18" tubing. The burrs had previously Panel Space: 70" x 19" been tediously removed by hand fil- Na. 3.2219: Overall: 831/8" x 22" x 18" ing. By inserting the tubing over the Panel Space: 77" x 19" sending the Ni. 3-3024: Overall: 761/e" x 33" e 24" end of the nozzle and Panel Space: 70" x 30" abrasive stream through the tube, ' P" and "G" Series RACKS have the burrs were removed in about five standard finishes of black rip- seconds per tube. ple, slate grey ripple (or prime In another case, the problem was coat only). to etch a dial facing on hard, pol- 1.3a----- ished plastic. The job was quickly Planning an electronic product? Consult Par -Metal "or and easily accomplished by direct- ing the abrasive stream over a tem- RACKS CABINETS the plastic facing. CHASSIS PANELS nittlIrrri plate placed over PRODUCTS CORPORATION, WAtete $4# 32-62 - 49th ST., LONG ISLAND CITY 3, N. Y Soft Materials Immune Tel.: Astoria 8-8905 Seeetvw:4 fa`talratd Export Dept.: Rocke International Corp. An interesting fact about the ab- 13 East 40 Street, New York 16, N. Y. rasive cutting stream is that it has WRITE FOR (ATA practically no effect on soft mate- rials. Thus, while it will readily drill a hole in hard, tempered glass, it will not have the slightest effect on skin tissue. This is a highly desirable NG RAVE safety feature because it will not cause injury should a worker acci- NAME PLATES PANELS DIALS dentally get his hand in the way of the blast. Likewise, it is especially in your own shop advantageous on certain jobs where a hard material is coated on a soft base. NEW MARINE RADAR Lowest set -tap time for unskilled labor ;. ..' f. '..-. m T CALIBRATIONS PROFILES cl R\ EU Sl lih-al.ES 10,000 IN USE Accepted by all leading manufacturers developed by Sperry New Mark 3 Marine Radar as the speediest, most versatile portable engraver. Only Gyroscope Co., Great Neck, N.Y., for merchant the NEW HERMES has these patented features: ships and work boats is packaged into 3 com- pact units: a 12 -foot scanner, a master Indicator Adjustable for 15 ratios. Self-centering holding vise. console containing 16 in. picture screen with Automatic depth regulator. Adjustable copy holders. new control circuits, and a transceiver unit for detecting nearby and distant objects, ranging SEND FOR BOOKLET 1M - 94 from 20 yds. to 40 mi. Power is transmitted in 65 kw bursts. Pulse repetition is 3000 pps for NEW HERMES (ENGRAVING MACHINE CORP. 0.1 Ilsec pulses, 75 pps for 0.4 tlsec pulses. 13-19 University Pl. New York 3, New York Operating frequency is 9375 MC. For product information, use inquiry card on last page. 145 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Soldering Techniques Still smaller (Continued from page 75) Something and much lighter tin plating seems to be the most ap- new is always than ever before! parent device with repeated accent on factors of corrosion resistance, happening at longer shelf life and ultimately facile dip soldering operations. The fly in Rugged, reliable this ointment has been the complaint and shockproof! that residual acids in the plating o baths have a tendency to contami- AIRPAX nate circuit surfaces and resist flux 763 MAX -1 action. Once again we are confronted with the problem of dirtied circuit patterns! Longest shelf life seems to be had A175 by a reversion to the old technique of tinning or solder coating conduc- MIDGET 1.437 tor surfaces. The pre -tinned conduc- MAX 60 cycle tor is apparently well worth the ex- CHOPPER tra solder dipping operation in terms of excellent shelf life as well as ex- Life tests on cellent component solderability. This Rated 25 to our recording 110 cycles should not be surprising when it is racks tell us considered that a tinned conductor Phase 21° at FITS 7 PIN this unit has represents a partial step in the de- 60 cycles MINIATURE exceptionally SOCKET sired metal solvent action inherent SPOT break - good life and before -make reliability. to a well soldered joint while elec- is 170' troplating simply the physical ad- Dwell time herence of one metal to another. In Life well over a sense then, a tinned conductor can hours AIRPAX 1000 be represented as being one jump DESIGNERS ENGINEERS Very low ahead of the electro -tin plated con- residual noise MIDDLE RIVER."-...... -'yBALTIMORE 20. MD. ductor. The foregoing should be qualified by saying that electro -tin plating is more widespread because its thickness, or build up on the cir- cuit can be much more accurately specifies controlled than pre -tinning which is nU MONr AIC accomplished by means of a solder II- bath dip. REVERBERATION UNITS Solder Fluxes for its new TELE -CENTER Assuming a well prepared printed "For better service to our many panel we feel it necessary to lend clients, Du Mont's new Tele -Center, only cursory after full consideration to fluxes. tests, has chosen Model It is 42A Reverberation Units for all Con- generally known that several trol Rooms," says Robert F. Bigwood, very fine fluxes are available which Manager of General Engineering Dept. at are specifically adapted to printed the Du Mont Tele-Center, New York City. circuitry. Needless to say these fluxes are for the most part Rosin or Resin Model 42A Reverberation Unit simulates re- type which are non -corrosive, verberation of a room of any size, using a elec- magnetic tape loop system with SEVEN trically non-conductive and gener- HEADS. Switching heads produces various ally fungus -resistant. Typical char- special effects as well as natural reverbera- acteristics of these available fluxes tion. are readily volatile The unit features built-in variable equal- solvents, and de- ization for special effectsi continuously ad- sirable surface tension effect on justable reverberation time; and po pres- molten solder. To reduce the tend- sure pads-resulting in better tape motion ency of such fluxes to thicken, be- and reduced head wear. Size is 171/2 x 19". cause of solvent loss, it is always good practise to keep flux baths cov- PRICE: $1, 375 00 ered when not in use and to have available proper flux thinners. A discussion of proper dip solder- ing temperatures can only be ap- Write for complete data on Model 42A- .d INSTRUMENT proached COMPANY INC by giving careful attention and on our INTERMODULATION METERS. it io to that basic article, the dip solder- ing pot. Aside from initial consid- Dept. T, 133 West 14th Street, N.Y. 11, N.Y. eration to the proper sizes and For product information, use inquiry card on last page. 146 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 shapes for accommodation of the circuit panels, a good solder pot APP11jkjal1 should offer these fundamental serv- ices: (1) It should have sufficient ca- ça pacity to produce solder tem- peratures up to 600 ° F. (2) It must provide adequate of RADIUM thermal reservoir to maintain elevated temperatures under FLUORESCENT and severest conditions of produc- 1 tion dipping and resultant PHOSPHORESCENT heat losses. LUMINOUS MATERIALS (3) It should be thermostatically controlled with a variation not exceeding ±10° F. (4) The heat should be evenly distributed over the entire crucible. Localized "hot spots" can readily damage some printed circuit base materials. Cast iron makes for a good rugged crucible. Also, the amalgamation of cast iron with molten solder is prac- T LINE tically non-existent and there is no fear of solder contamination from this source. There are solder pots now available, constructed with cru- cible jackets containing special heat- ing mediums which are highly stable thermally, non -explosive, vaporless and odorless. In these models, the heat source is immersed in the me- TOROIDS dium and results in terms of steady, .r73,1111,1.9c:ta. rea+ even heat distribution are far supe- *Q-s,,aMaw rior to those obtained with contact FROM BLUEPRINT TO or embedded type heating elements. FINISHED PRODUCT! Solder Alloys Sampson has complete facilities to furnish all necessary parts or It has been found that solder al- will work from parts supplied. loys close to the eutectic composition DIALS, POINTERS, KNOBS, exhibit most effective results in al- etc. accurately processed to your MILITARY CIVILIAN loy formation and successful pene- tolerances according to Govern - tration of the intricate nooks and m e n t Specifica- naremmeae..etweew.orerrtr studded crevices of the component tions! From Blue- circuit boards. Widespread use of eutectic solder itself (63/37) is noted print to finished Kf nvo n particularly with copper clad circui- Product, our materials and TRANSFORMERS try. This permits effective opera- tion at temperatures approximating methods of application are Meet All Government and 450° F. although it seems evident Government Approved! Commercial Requirements that best results are obtained in the NEWLY developed photo - Inquiries Invited range of 500 to 575° F. Too often the screen method for applying important difference between solder materials to curved and melting points and their effective odd shaped surfaces. ir.roteeo-ilutYái wr ,vó.f.s \ working temperatures is not consid- ered. The optimum alloying or sol- vent action of solder cannot be ac- complished without ample heat; the -15,77 fact that a solder has melted does not mean that it is hot enough to kf;trtrwg bring the joints to be soldered to adequate temperature for good al- loying. This gap between melting or liquid temperatures, and working N KLnvon (alloying) temperatures is more ac- TRANSFORMER CO., INC. centuated when departures are made and even more 2834 W. Lake St., Chicago 12, III. 840 Barry St., New York 59 from the eutectic, amounts of silver are when small WRITE FOR DESCRIPTIVE BROCHURE! MEIewrbr.ila!+irwettefecefraw added to the alloy for dip soldering For product information, use inquiry card on last page. 147 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Soldering Techniques plan your (Continued from page 147) production of silver-plated or silver -fired ce- with ramic surfaces. In these cases, the plastic range of the solder (a con- KAHLE dition just short of complete lique- machinery faction) is increased. The more ob- vious manifestation of insufficient heat in the solder bath is high sur- built specifically for your operation face tension, and on the circuit boards the formation of excess solder in drip -like "stalactites" or "bridges" Industry leaders in crossing insulated parts. The actual electronics, glass, and allied of a well soldered fields have continuously physical contour keyed their operations to connection will be quite apparent, KAHLE Machines for over smooth, slightly rounded by surface a quarter of a century. tension in the bath but unmarred Your production rate, your by excess driplets and blobs of sol- specifications, your require- der. Only good flux action and an ments-are "planned-in" ample supply of evenly distributed KAHLE Machines. heat can produce the desirable re- sults. Call KAHLE for "machines Solder Facts that think for you i" Tin does not "boil out" of a solder pot nor does it rise to the surface as kahle in an oil -water mixture. This is a ENGINEERING COMPANY common misunderstanding of the properties of solder, the fact being 1314 SEVENTH STREET NORTH BERGEN. N. J that when solder is in a completely liquid state its ratio of tin -to -lead cannot be altered. Accordingly it is also a mistake to believe that one must periodically "prime" the pot with pure tin to make up for these fictional losses. While the solder bath is cooling at the end of a work- Have you seen ing day, there can occur "eutectic segregation" wherein lead rich crys- tals are first to precipitate leaving a tin rich alloy at the top which will CORNING'S NEW PRICES be used first when the solder is re- melted unless the completely molten solder is stirred before use. Further, on Fixed Glass a solder bath will always tend to Capacitors? become sluggish after the imposition of a long run work load due to the natural alloying action of solder it- self. With metals such as brass and copper, contamination will eventu- ally take place in the form of zinc or copper particles created by the dissolving of brass and copper in F/0.8, 2" solder. When a solder bath becomes COOKE LENS contaminated in this fashion, the for 16 mm most economical alternative is to re- "TV EYE" place the bath with fresh solder rather than to attempt priming with WORLD'S LARGEST STOCK tin or pure solder. It might be well Coated Hi -resolution Lenses for every TV need ... Wide -Angle, to add that dipping frames should be Normal, Telephoto -11/4 to 20" . COOKE, Zeiss, Ektar, Carl nickel plated steel since solder will Meyer, B & L, Wollensak, Ross, Astro, etc. Featuring all Access- ories . Baffle Rings, Counterbalances, Fittings. not wet nickel. Foc. Mounts fit RCA, DuMont, G.E. Image Orth. Varying degrees of success have Special Mounts for G P I and others. Expert Fitting Service. been reported with the application 15 -day FREE TRIAL... Unconditional GUARANTEE. of palm oil or powdered charcoal to Write for Free TV LENS BULLETIN #754 TV solder for the of Serving TV since 1936 baths prevention surface oxidation. However palm oil BURKE & JAMES, INC. 321 South Wabash Ave., Chicago 4, III. U.S.A. cannot be used at much above 450° For product 148 Information, use Inquiry card on last page. TELE -TECH 8 ELECTRONIC INDUSTRIES December 1954 F. while with charcoal there is the ever present possibility of contami- nating the circuit with a current carrier unless most stringent clean- ing precautions are taken. The best middle of the road policy appears to PEERLESS be an +Occasional skimming of the Buy pot with a flat piece of steel, porce- lain, or even cardboard. and KNOW Although several of the larger from companies have developed semi- right! automatic dipping procedures, very you're worthwhile production results are MIKE possible with the standard three bath routine (flux bath-solder dip- rinse). For instance, one manufac- turer reported a production rate of approximately 100, seven square The PEERLESS Catalog is inch pieces per hour using the hand - dip three bath process. Even average constantly improved results, however, cannot be expected without strict adherence to the few simple rules for good soldering. Silicon Transistors New items added as developed (Continued from page 78) YOUR precipitated in the gold wire. It is a RELY ON near miracle that the parent silicon PEERLESS CATALOG crystal was not cracked in this case. Fig. 10 shows a case where the wire was removed before cooling Obsolete items removed and this unfavorable cooling -in - 60 50 40 I I Consistently the highest .9 A_N1,E1\1\TA 30 quality in the industry IM Vc `( iie 20 -. 10 - - - 0 The manufacture of quality trans- formers is a long-standing habit ,00 le Mu. with PEERLESS. Typical of PEERLESS Your one best NRN SIL CON TRANSISTOR Fig. 12: Charaderlstic curves of fairly products are the famous 20-20 and source for good silicon transistor with alpha 0.9 20-20 PLUS lines, the logical choice broadcast equipment duced-nucleation of the silicon was when superlative performance is re- eliminated. This is a nearly perfect quired. Every PEERLESS product is a example of the effect of crystal 855 35th St., N.E., quality product. Keep your PEERLESS Cedar Rapids, Iowa forces on fusions, and points the way Catalog and latest price lisi handy. 261 Madison Avenue, to almost ideal transistor junction New York 16 geometries. It's up-to-date. It's DEPENDABLE. 1930 Hi -Line Drive, Fig. 11 is a section through a gold - Dallas 2 silicon transistor with an alpha of If you don't have the latest PEERLESS 2700 W. Olive Ave., about 0.6 at 5 volts and 1 ma. The Catalog, write for it today! Burbank diode characteristics of gold -silicon Dogwood Rd., Fountain City, Knoxville, Tenn. transistors are quite remarkable, be- Petroleum Bldg., ing still good as high as 200 or more Tallahassee, Florida volts. The base resistances are about PEERLESS 74 Sparks St. 300 ohms; the dynamic collector im- Ottawa, Ontario pedance of present units show a Electrical Products considerable dependence on emitter current, but in general are about 1 A DIVISION OF megohm, the emitter resistances run AITEE from 10 to 60 ohms, at one mil emit- ter current. 9356 Santa Monica Blvd., Beverly Hills, Calif. Improving the alpha still remains 161 Sixth Avenue, New York 13;, N.Y. For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 149 r,r Ir1111 tiyjg .,rr11r1,r1 D ,,,,r,trr,r,. Silicon Transistors r (Continued from page 149) KINESCOPE Engineering as a major problem. At present, few RECORDING units are being made with alphas as with high as 0.9. Since thermal lifetime WRITERS degradation alone is not the reason buaranteed results! for alpha problems at these low fu- L. OR YOUR sion temperatures, a great deal of MONEY BACK effort is being expended at the pres- no ent time in research aimed at solv- ENGINEERS, E. E. or PHYSICS ing this vexing problem. GRADUATES, for preparation Fig. 12 shows the characteristic of technical manuals... curves of a fairly good silicon fu- sion transistor which has an alpha of about 0.9. Note the effect of emit- HUGHES RESEARCH AND ter current on the collector voltage DEVELOPMENT LABORATORIES' breakdown point. expanding program for pro- duction of radar, electronic digital computers, guided. NOW, A DUAL-PURPOSE Fusion Properties missiles and other military advanced electronic systems Before doing any actual transistor and devices requires the following: "SUPER 1200" CAMERA fabrication work, a great deal of time was spent in investigating the with TeleVision-Transcription fusion properties of more than 80 D ELECTRICAL ENGINEERING AND PHYSICS GRADUATES to prepare "TV -T" Shutter... different alloys. The usefulness of any alloy is dependent upon many operating, servicing and over- ...designed for Kinescope Recording...and things such as: Does it wet the sur- hauling instructions for complex face easily? electronic equipment. Those also shoots regular Live Action 16 mm Does it have the feature with previous maintenance Sound -On -Film Talking Pictures with no of being soft enough or having a experience on military equip- Camera modification! The "Super 1200" coefficient of expansion close enough ment preferred. Writers will to silicon, so that it does participate in Camera with "TV -T" Shutter (Pat. Appl'd. not crack a three-month the silicon in cooling down? Will it program in our technical for 1949) can Kinescope Record a 30 fuse at low enough temperature so training school to become minute continuous show using 1200 foot that thermally induced lifetime deg- familiar with the latest Hughes film magazines. Write today for infor- radation is not equipment prior to writing too serious? Can the assignments. mation and prices. junctions formed be etched properly in presence lIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIL of the alloy, and of course are the electrical properties © ENGINEERS EXPERIENCED in the writing and preparation USE AURICON "TV -T" KINESCOPES FOR: of these of junctions satisfactory? maintenance manuals for A great deal of responsibility ic DELAYED RE -BROADCASTING for electronic equipment or guided the success of any transistor remains missiles. These specialists will E C SPONSOR PRESENTATIONS -f-- in the etching step, where the sur- work step-by-step with the IC COMPETITION CHECKS face is cleaned to remove shorting people designing, developing and manufacturing the products -« PILOT KINESCOPES paths and left in such a condition as to discourage recombination of the involved. Experience in the * SHOW-CASE FILMS emitted electrons. This last writing of engineering reports point still is of value. SIC "HOT KINES" has not been solved. The surface re- combination [ AIR CHECKS velocity in some exper- imental units was of the order of Auricon 16 mm Sound -On -Film Cameras 5000 cm/sec., as calculated from re- H OW TO APPLY J S are sold with a 30 -day money -back sults obtained from other measure- E guarantee. You must be satisfied! ments with the micro optical light Write full details probe described earlier. This means of your qualifications to IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIdlllllllllll that entirely too large a fraction of 1 Auricon 50 ft. Kinescope "TV-T" Demonstration the emitted carriers die on the sur- Films are available on loan to TV Stations and faces and never reach the collector. Film Producers. Please request on your letterhead. In conclusion, we are convinced HUGHES that none of the problems we have L yet to solve are problems that cannot ^- HOIIyyVOOÓ be solved by careful study, and feel Research and Development confident that we will gradually Laboratories overcome them within the relatively SCIENTIFIC AND ENGINEERING STAFF near future. The full impact of sili- B-ERNDT-BACH, INC. Culver City, Loa Angeles County con transistors on the electronics California 6926 Romaine St., Hollywood 38, Calif. field will not be seen for several Assurance is required that relocation years. It is to the advantage of all to of the applicant will not cause disruption MANUFACTURERS OF SOUND -ON-FILM treat common scientific problems as of an urgent military project. RECORDING EQUIPMENT SINCE 1931 joint industry problems. J For product Information, use inquiry 150 card on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Printed I -F Amplifier (Continued from page 89) HAVE YOU LOOKED extremes of temperature-from AT SPRAGUE'S -55° C to 80° C. It has withstood 10 G's of vibration at the lower fre- STYRACON " "B" quencies-to 60 cpm-and suffered no damage at much higher frequen- CAPACITORS?\` cies. The base material was found to be sufficiently rigid and virtually ...close tolerance impervious to moisture and fungus. ... high leakage resistance The gain of the prototype amplifier ...low power factor (high O) measures more than 115 db-i-f in- ...freedom from dielectric put to i -f output-with the required absorption bandwidth and gain control. As a result of subminiaturization, the outside dimensions of the case are 7 in. long by 3% in. wide by 7/g in. deep. Development Time Because of its relative simplicity, the amplifier required less than the usual amount of time for develop- ment and testing. The black tape, used for delineation of the circuit, can be applied in a fraction of the Styracon "B" capacitors were time required for inking. Removal designed by Sprague especially of the tape, for alteration or correc- for the critical requirements of tion, is also less difficult than chang- analog and digital computers, ing an inked drawing. precision tuning circuits, high Q The etched circuit technique has tuned circuits, and bridge and established a foundation for modi- reference circuits in electronic fication and i further -f development equipment. Extremely high insulation re- STABILIZED TEMPERATURE/DECREES CENT/GRADE/ sistance, freedom from dielectric absorption, extremely low power factor (or high Q), close capaci- GLASS 120 tance tolerance, and unusually (INPUT TUBE 6111) SHIELD excellent capacitance stability are Only .94 cu. inches in size-yet it 100 GLASS (INTERSTAGE#5702 80 WA) achieved with an especially proc- carries 3 -amp. loads in the 4PDT SHIELD combination. It's available up to 60 AMBIENT AIR INSIDE CASE essed polystyrene film dielectric. 6PDT, and with class "H" 40 OUTSIDE METAL CASE The temperature coefficient of ca- AMBIENT insulation. 20 pacitance over the rated operating It's extra efficient, too, having temperature range of -55°C to only one air gap in the magnetic 20 + 85°C is practically linear, and assembly. By spring -holding the is independent of frequency. armature rigidly in place, and Sprague Styracon "B" capaci- using cross-bar contacts, all align- tors are available in various me- ment problems are eliminated. chanical configurations to meet hence there Insulation is inorganic, Fig. 4: Comparison of operating tempera- all application needs. All capaci- is no gassing or bubbling,. tures of various components in i -f amplifier tors are hermetically sealed in The ADVANCE TO telephone type metal cases. Write for Bulletin work. By adding to, or subtracting operates on 90 milliwatts or No. 250, available upon request less. Withstands 10G vibration from, the length of the basic etched board, new amplifiers of different to the Sprague Electric Company, (10 to 55 CPS) . Ambient temp- 233 Marshall St.,N.Adams, Mass. erature range: -55°C to +125°C. gains and bandwidths can be con- Life expectancy: 1,000,000 cycles structed-with little alteration of the with cross -bar contacts. Open and tuning scheme. Thus i -f develop- hermetically sealed types. Write ment time may be shortened con- for details. siderably. The amplifier is, moreover, easy to construct and maintain. Its com- ponents are commercially available PRAGUE ADVANCE ELECTRIC LARGEST and so placed that they can be iiiIORLD'S AND RELAY CO. quickly installed or replaced. The CAPACITOR MANUFACTURER 2435-M WORTH NAOMI STREET economic value of such a feature is BURBANK, CALIFORNIA quite obvious. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 151 Write today for your free copy of this Technical Paper. ask for data file 1206 7eeete JON ES A Precise, Wide -band, Continuously Variable FANNING Delay Line STRIP BY NORMAN GAW, JR. Connections are made AND DAVID SILVERMAN through Fanning Strip, on bench or anywhere Corporation Helipot apart from barrier strip, MELVIN B. KLINE and quickly slipped Instrument Division into assembly. Allen B. DuMont Laboratories, Inc. Designed for use with Jones Barrier Terminal Strips Nos. Presented at THE 1954 WESCON 141 and 142, for 1 9-141 to 2C terminals. Barrier Strip 436 Simplifies and facilitates soldering. Insures positive correct connections. Saves time. 9-161 Ideal for harness or cable assembly. Fanning Strip. Strong construction: Brass terminals, cad- OIIIlJirst Pat. miuon plated. Heavy bakelite mounting. applied for. in precision potentiometer, E Helipot Corporation/ South Pasadena, California HOWARD B. JONES DIVISION CINCH MANUFACTURING CORPORATION a division of BECKMAN INSTRUMENTS, INC. SHAMAN CHICAGO 24, ILLINOIS SUBSIDIARY OF UNITE DCARR FASTENER CORP. aIto»c(ewe ül,oteutt WANTED eentiwuelt v... for Murder... WILDER CANCER is the cruelest enemy of all. No other disease brings so much suf- small parts fering to Americans of all ages. YET-though 23 million living Ameri- Comparator cans will die of cancer, at present rates -there is reason for hope. Thousands model C are being cured, who once would have been hopeless cases. Thousands more Vertical Design can have their suffering eased, their Erect Image lives prolonged. And every day, we Eye level Screen come closer to the final goal of cancer research: a sure and certain cure for llorizontal Stage all cancer. An Entirely New Model Optical Comparator THESE THINGS all been helped by Designed for 100°'o Production Inspection have ACCURATE - FAST - INEXPENSIVE your donations to the American Cancer Promotes Inspection Economy Society. This year, please be especially generous! If you manufacture mass produced parts that are now being inspected or should be inspected on an Optical Comparator, the new Small Parts Comparator will enable you to inspect them quickly, accurately and Cancer economically at a surprisingly low per -piece inspection cost. MAN'S CRUELEST ENEMY Write for Illustrated Folder-Code GINZE Strike back-Give Geo. SCHERR OPTICAL TOOLS, Inc AMERICAN CANCER SOCIETY 200 -TT LAFAYETTE STREET NEW YORK 12, N.Y 152 For product information, use inquiry card on last page. TILE -TECH $ ELECTRONIC INDUSTRIES December 1954 Glow Transfer Tubes (Continued from page 86) Hi -Fidelity set by the other two methods previ- ously described, are shown in Figs. dynamic .2eaeo, 7 and 8. Fig. 7 shows a switch tube, which a name to remember cuts off when a signal appears, al- microphone lowing the reset line to drift up. The in switch tube must conduct sufficiently electronic hardware to keep the reset line at less than only 20V for satisfactory operation. For forced reset, the circuit of Fig. 8 is used. This is essentially the same $s,00 circuit as that of Fig. 7, except that Aioe now the switch tube is used to switch new! +200V to the reset line. taper pin Quickly converted Counter Tubes in Cascade for floor stand use terminals If it is required to count to num- for Four different types available bers greater than the capacity of any including double -end taper, one counter tube, a number of tubes Broadcast taper from iront, taper from can be placed in cascade. Television back, and taper from front Suppose we place three ten count with blind hole, Sizes for tubes in cascade. Then the capacity Recording standard terminal board thick- of the system will be 1000 counts. Public Address nesses, or to your specifica- Now let us assume we wish to reset tions. Half -hard brass bar, the system after 576 counts. This can with copper flash and electro - NEW TURNER tin plate finish. 57 This new dynamic microphone is designed to meet the requirements of TV, broadcasting, PA, high fidel- ity recording ... and, at an excep- tionally low price. Design is slim and modern, with black satin finish that can't reflect light. Sound char- acteristics for both voice and music are excellent. Response: 50 to 13,000 cps. Level: -55 db. Has built-in 'I//I Fig. 10: Multi -element glow transfer tube Cannon XL -4 connector, permitting always call be done by the use of a three input selection of high or low impedance "and" gate. The three inputs will be by making connection to proper pair i!eaeafor: K, from tube 3, K, from tube 2, and of conductors at terminal end of Ke from tube 1. There will be an cable. Matching stand with built-in shock mount priced separately. Complete Hardware output from this "and" gate only when the number 576 is reached. Terminal Boards This arrangement is shown in Fig. 9. Terminal Lugs The output of this "and" gate is then Miniature Terminals fed to the circuits described previ- THE CO. Diode Clips ously. By switching the gate to vari- ous cathodes, we can again preset Insulated Terminals the system to count to any desired Printed Circuit Hardware number. Mail the coupon today Connectors A photo of a glow transfer tube for complete information. made by Ericsson Valve Co., Eng- write for free catalog land, is shown in Fig. 10. THE TURNER COMPANY I 923 - 17th st. NE, Cedar Rapids, Iowa New Transformer Capsule Please send me complete information on Aircraft Transformer Corp., West your new Model 57 Dynamic Microphone N. and Willow Sts., Long Branch, J., NAME announces the manufacture of trans- formers by a patented process under ADDRESS 1000.11. the trade name, "Form-Flex." Sealed Crie in new neoprene capsule and con- STATE LYNN ELECTRONIC ventional can, the unit saves weight, RESEARCH CO. L___ space, and cost, yet meets the per- IN CANADA: Canadian Marconi Co., 501 SOUTH VARNEY STREET formance requirements of MIL -T- Toronto, Ontario and branches RUST OFFICE BOX 69 EXPORT: Ad. Aurierna, 89 bread Street, BURBANK VICTORIA 9-1561 27, Grade 1 specifications. New York 4, N.Y. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 153 ANNUAL INDEX 1954 The Annual Article Index for Tele -Tech & Electronic Industries has been arranged by subjects for easy reference to related topics. The first figure indicates the month in which the article appeared; the second figure indicates the page AIRCRAFT, MOBILE AND MARINE "Rod, Bar and Wire Product Information" 12-64 "Scientific American Reader" 4-60 Month "Soft Magnetic Materials for Page Telecommunications" Richards & Lynch 3-52 Aircraft -Electronic Progress 1953-1954 Albert J. Forman 5-66 "Statistical Theory of Extreme Values and Application of Integrator Type Some Practical Applications" Gumbel 6-64 Signal Enhancers C Strom & J. Fantoni 2-98 "SOLDER ... its fundamentals and usage" Barber 9-46 Calculating the Range of Mobile Systems.. Richard K. Thomas 6-108 "Symp. on Temp. Stability of Electr. Insulating Materials"....12-64 Designing Scale Model Aircraft for "Table of Secants and Cosecants to Nine Significant Antenna Analysis Robert F. Blaine, Pt. I, 9-84; Pt. IL 10-90 Figures at Hundredths of a Degree" 7-44 FM Altimeter -Audio Amplifier Design....Bernard B. Bycer 6-124 "Tables of Integral Transforms" 5-60 Low -Level FM Altimeter 4-93 "Tables of Lagrangian Coefficients for Radar Recording System for Air Traffic Control....J. McLucas 7-70 Sexagesimal Interpolation" 5-60 "Raydist" Applied to Off -Shore Expl C Hastings 2-114 "Techniques of Photo Recording from Cathode Ray Tubes" 5-60 AMPLIFIERS "Techniques of Plant Maintenance and Engineering" 9-46 "Television" Zworykin & Morton 10-60 Design Criteria for Transistor "Television, A World Survey" 4-48 Feedback Amplifiers S Ghandhi 3-94 "Television Receiver Design-Monograph 2" Neeteson 3-60 Designing a Transistor Sonar "Theory and Design of Electron Beams (2nd Ed.)"....Pierce 4-60 Preamplifier R V. Fournier & H. Terkanian 11-78 "Timing Engineering" Saake 1-123 FM Altimeter-Audio Amplifier Design Bernard B. Bycer 6-124 United States Dept. of Commerce Publications 12-64 G -Curves and Degenerative Amplifiers Keats A. Pullen 4-86 WCEMA Directory 8-54 Graphical Methods Speed Transistor Power Amplifier Design R F. Shea, Pt. I, 6-116; Pt. II, 7-72 BROADCAST STUDIOS New Developments at Bureau of Standards 10-144 STATIONS, Transistor Reliability in Low Power Conelrad-Practical Operating Consid A. P. Walker 6-104 Audio Uses F M. Dukat 10-77 DuMont Opens New Tele -Centre 7-86 High -Efficiency AM Radiation from ANTENNAS High TV Towers G. Gillett 2-96 New Color Stripe Generator for TV Stations 5-122 An Automatic Antenna Pattern Remote Control System for Recorder Lawrence Lechtreck 11-88 Bdcst. Transmitters S Van Wambeck 11-94 Contouring TV Antenna Patterns L O. Krause 4-90 Remote Unit for Sportscasts Ed Miller 9-89 Designing Scale Model Aircraft for "Stairway" Echo Chamber Harold Schaaf 7-61 Antenna Analysis....Robert F. Blaine, Pt. I, 9-84; Pt. II, 10-90 Equipment for Testing Elliptically "Vagabond" Wireless Microphone System..Thomas W. Phinney 3-86 Polarized Antennas Carroll W. Bradford 8-70 Multiple Unit Antennas With Skew M. W. Scheldorf 6-122 CABLES, TRANSMISSION LINES, WAVEGUIDES, CAVITIES New Antenna Coupler for UHF Circuits R I. Stainbrook 8-86 Switch Tuned UHF -VHF Antenna Guy Hills 1-93 Calculating the Impedance of Co -Axial Lines E Herman 11-92 UHF -VHF Printed Circuit Diplexer Ansel Gere 3-101 Measuring Cavity Resonator "Q" Markus Nowogrodzki 6-97 Multilayer Distributed Constant Delay Lines W. Carley 5-74 AUDIO Plating Quantity Indicator for L -Band Waveguides M. Davidson & N. Rahal 9-76 Designing a Miniature Unidirectional Ribbon Power Rating of R-F Coaxial Cables....R. Soria & J. Krisilas 2-71 Microphone B B. Bauer & J. W. Medill 7-66 Rotary Joints for Microwaves J Guerraera & J. Fisch 11-91 Plant Noise Surveillance John K. Hilliard 8-73 Thermoplastic Insulated Tri-Axial "Stairway" Echo Chamber Harold Schaaf 7-61 Pulse Cables J Spergel & M. Tenzer 10-74 Techniques for Designing Pressure Ultrasoniç Metal Delay Lines 3-78 Microphones W. Beaverson 5-84 Transistor Reliability in Low Power Audio Uses..F. M. Dukat 10-77 CHARTS, NOMOGRAPHS Transistorized Magnetic Microphone 3-91 "Vagabond" Wireless Microphone System..Thomas W. Phinney 3-86 Circuit Symbols 6 -Insert COLOR TV-Glossary of Terminology. BOOKS Equipment & Systems 10 -Insert Critical Damping Nomograph Robert T. Moore 5-90 "Applied Electronics Annual 1953-54" Blaise 6-64 Filter Element Nomographs Ralph Davidson 2-87 "ASTM Standards on Materials for Radio Tubes and Reactance Nomograph Joseph F. Sodaro 3-89 Electronic Devices and Electrical Heating Resistance Squashed RF Coils Save Space I Gottlieb 10-87 and Related Alloys" 9-46 "Automatic Office, The" Alden. Clemin- CIRCUITS, NETWORKS AND FILTERS shaw, Dinsmore, McClay, Pearsall, Williams & Windsor 12-68 "Chamber'sShorter 6 -Fig. Mathematical Tables" Comrie 6-58 100 Points for Electronic Design Engineers 11-68 Querfurth 5-56 An Analysis of Resistance Terminated "Color TV Dictionary" Johnson 9-44 Networks L Weinberg 8-96 "Damages Resulting from Lab. Vibration & Bandpass Filter Nomographs Ralph Davidson 6-113 High -Impact Shock Tests" 6-64 Computer Circuits for High "The Dictionary of Business and Industry Schwartz 9-44 Temperatures John F. Koch, Jr. & George C. Hand, Jr. 1-82 "Effective Radio Ground Conductivity Measurements Designing Inductively Coupled Traps William F. Gariano 4-83 in the U. S." Kirby, Harman, Capps & Jones 7-44 Electronic Power for a Synchrocyclotron....L. Kornbllth, Jr. 4-98 "Electroacoustics" Hunt 10-60 Gain -Stabilized I -F Transformers John F. Clemens 12-87 "Electronics" Brown 6-64 Graphical Methods Speed Transistor Power "Electronics" Corcoran & Price 6-58 Amplifier Design R F. Shea, Pt. I, 6-116; Pt. II, 7-72 "Electronics" Starr 6-64 Low -Pass Duplexing System for High-Frequency Pulse "Elements of Electrical Engg. (6th Ed.)" Cook & Carr 3-60 Transmitters...William L. Hartsfield & Richard Silberstein 2-76 "Engineering Analysis" Van Planch & Teare 9-44 Measuring Time -Delay in Pulse Circuits...Melvin H. Murphy 9-72 "Evaluation of C -Band (5.5 cm) Airborne The Microwave Gyrator-A New Weather Radar" 5-60 Circuit Element C Hogan 11-64 "Fundamentals of Transistors" Krugman 8-54 New Antenna Coupler for UHF Circuits R. I. Stainbrook 8-86 "Handbook of Microwave Measurements"...Wind & Rapaport 8-54 Passive Broadband Design Techniques H. M. Schlicke 3-98 "High Fidelity Techniques" Newitt 3-52 Subharmonic Crystal Oscillator 12-86 "History of American Industrial Science" Hall 5-60 Variable Toroidal Inductors-New Electronic "Hyperbolic Protractor for Microwave Components Lewis G. Burnell 10-68 Imped Measure" Deschamps 1-123 "Introduction to Color TV" Kaufman & Thomas 6-58 "Inventions and Their Protection" Woodling 5-52 COMMUNICATION SYSTEMS "Investigation of Electron Tube Reliability in Military Appl." 4-60 Calculating the Range of Mobile Systems R K. Thomas 6-108 "Low Compandors Boost Performance of Voice -Frequency Frequency Amplification" Voorhove 5-56 Circuits Tate B. Collins, Jr. 9-70 "Magnetic Fields of Cylindrical and Annular Coils" 4-60 Doubling Single Sideband Channel Capacity...C. D. May, Jr. 6-126 "Mechanical Vibration" van Santen 5-60 Industrial Appl. of Electronic Equip. in "Microwave Lenses" Brown 3-60 Auto. Ind. A Forman 1-62 "Microwave Theory and 11-74 Technique" Reich, Ordung, Krauss & Skalnik 1-123 Microwaves on West Virginia's Turnpike P J. Brewster "Modern Physics for the Engineer" Louis N. Ridenour 12-64 New Carrier System Links All Transmission "Motion Picture and Television Almanac 1953-54"...Aaronson 7-44 Media W. Chaskin 8-74 "Optical Image Evaluation" 7-44 New Military Field Radio 8-89 "The Oscilloscope at Work" Haas & Hallows 10-60 "Proceedings of the N.E.C. (1953)" 5-52 COMPONENTS, CHASSIS ELEMENTS "Protection Against Betatron -Synchrotron Radiations up to 100 Million Electron Volts" 6-64 100 Points for Electronic Design Engineers 11-68 "Radio Amateur's Handbook (31st Ed.)" 4-60 The Atomic Battery 3-85 "Radio Receiver Design t2nd Ed.)" Sturley 5-52 Capacity Commutator Eliminates "R-C/RR-L Time Constant' Shure 9-46 Frictional Contacts A Montani 3-76 "Report on Available Environmental Test Facilities for Designing a High Speed Relay A. F. Bischoff 10-84 Testing Electronic Equipment" 12-64 Designing an Electro-Thermal Relay John J. Dietz 9-65 134 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 roadhaod RF Pouor1IeÎers" THE CHOICE OF ALL ARMED SERVICES FOR MICROWAVE POWER MEASUREMENTS POWER: PULSE and CW _5µW to 5W average FREQUENCY : ºoMC - 1o,000Mc 5% Absolute at all ranges, ACCURACY frequencies, temperatures INDICATIONS: Direct Reading CALIBRATION: Compensates for All Variables R F COMPONENTS: 3, 6, 10 and 20db Attenuators, Bolometer Mount and Elements, R -F Cable BOLOMETER: Broadband, High Overload Capacity PLUMBING: 3/9 rr and 7/e rr 50 -ohm Coaxial POWER SOURCE: 115VAC ±15%, 50-1000 cps CONSTRUCTION: Rugged, meets all JAN, MIL re- quirements TYPICAL APPLICATIONS Microwave Links ... Television ... Communications .. . Radar ... Telemetering ... Signal Generators .. . Laboratory Standards. Write for descriptive literature to Department TT -12 Bruno - New York Industries Corporation DESIGNERS AND MANUFACTURERS OF ELECTRONIC EQUIPMENT 460 WEST 34th STREET NEW YORK 1, N. Y. If you have E labeling IAVERY Laminates for high problem ordinary uns, fers self-adhesive labels can't solve...use L1A1 strength -to -weight ...the tough ones are our specialty ...where other types of labels are found Strength and light weight are two "wanting"... or when you need to advantages of Synthane laminated plastics. Because of substitute an attractive pressure -sensitive these properties Synthane is label for a costly nameplate... widely used in aircraft construc- Avery Kum-Kleen labels tion, ball bearing retainers, and =-=s are the best solution many similar applications. Syn- to your problem! thane also has high dielectric strength, chemical resistance, ...and so are the other kind.. and dimensional stability. ...where you want faster labeling... Synthane is supplied in sheets, improved appearance...labels that won't rods, tubes, special shapes and fabricated parts and in wide pop, curl or or those the housewife a peel... can choice of grades to meet design remove without soaking or scraping... there's requirements. The coupon will no substitute for an Avery Kum-Kleen label bring you full information. faster easier more economical r Patented Avery dispensers... manual or electric... SYNTHANE CORIPORITION feed die -cut pressure -sensitive labels off roller tape, 11 RIVER ROAD, OAKS, PENNA. ready to be LAID ON any clean, smooth surface. No moistening ...no sticky fingers. Marulacturers of laminated plastics Where can YOU use these labels in YOUR business? Please send me more information about Synthane. Write today for free samples, case histories and prices. Name AVERY ADHESIVE LABEL CORP., DIV. 111 Company 117 Liberty Street, New York 6 608 South Dearborn Street, Chicago 5 Address 1616 So. California Ava., Monrovia, Cal. Offices in Other Principal Cities City (zone) State Originators of Pressure -Sensitive Labels J TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 155 Designing Instrument Rectifiers Edward L. Pagano 5-88 Heat Pays Off Ernest G. Underwood 3-93 Determining Cap. Leakage Resist. & Hour Set System for Studio Clocks Larry Crissman 1-88 Dielectric Soak E Molloy 8-90 Impedance Matching and Loss Box Eugene F. Coriell 6-120 Effective Permeability of Cylindrical Interruption Reports John Whitacre 12-92 Iron Cores R Lafferty 2-84 Multi -Mike Input to Console William Naramore 8-83 Guided Missile Launching Protection from Lightning and Static Discharge E Smith 2-80 Connectors L Baird & H. Upston 5-70 Remote Insurance Donald M. Wheatley 8-82 Multilayer Distributed Constant Delay Lines W. J. Carley 5-74 Simple Bracket Makes Log -Keeping Easy Job F H. Travis 8-82 New Developments at Bureau of Standards-V 10-144 Simplex Telephone Signa.ing System Robert Flory 1-88 New Resistor Voltage Coefficient Simulating Telephone with Fi.ter Mike Elton B. Chick 2-81 Tester L Rosenthal & A. Louis 9-62 Telescope for Microwave Xmitters....Robert M. Crotinger 6-138 Noise Analyzer for Deposited Thermocouple Protection Don V. R. Drenner 11-76 Carbon Resistors Ali Allmacher 6-102 Time & "Beep" Signals J C. French 7-82 Resonance Effects in Tubular Feedthru Caps M. Slate 6-98 Xtal Temperature Control Oven Edward J. White 7-82 Selenium Commutator Eliminators 5-73 Self -Shielding PM Focus Units...S. L. Reiches & R. O. Gray 2-93 RECORDERS, PLAYBACKS Solar Battery Taps Sun's Energy 6-128 Thermistors: Components for Electronic Adding Monitor to Tape Recorder Everett A. Thompkins 1-89 Control and Measurement Albert J. Forman 4-72 Ampex Reverberation Ea Marzoa 5-80 Transient -Free Switch 5-83 Bulk Eraser B J. Harris 1-89 Ultrasonic Metal Delay Lines 3-78 Eliminating Coupling of Erase Heads James M. Weldon 2-80 Variable Toroidal Inductors-New Fast Dubbing Dick Meyer 7-75 Lewis G. Burnell 10-68 Improved 2500' Tape Reel T A Hildebrand 6-120 Electronic Components Multiple Echo Effects Bob Crossthwaite 3-93 Multiple Tape Recorder Input Donald M. Wheatley 10-89 COMPUTERS Program Selection for Tape Recorder Cecil P. Clark 2-81 Analog Computing by Heat Transfer Paul H. Savet 2-101 Remote Recorder Control John Whitacre 11-77 Computer Circuits for High Repairing Erase Heads Earl R. Ward 11-104 Temperatures John F. Koch, Jr. & George C. Hand, Jr. 1-82 Service Aid for Tape Rec. Take -Up Clutch H. Peters 4-114 Designing a DC Voltage Regulator Simple Tape Recording R W. Hoffman 6-121 for Computers R S. Selleck & R. T. Moore 6-106 Slow Speed Solution Edward J. White 6-121 DYSEAC-New Electronic Computer 8-91 Tape Mechanism Don V. R. Drenner 8-108 High -Density Digital Data Recording Edward J. Armata 7-68 Tape Recorder Modification W. E. Bradford 10-88 FOSDIC-Sensing Device for Computers 2-78 Tape "Stickage" Talmadge R. England 11-76 IBM Opens New Research Labs 11-117 Tape Storage Joseph M. Williams 11-77 Manufacturing Computers for Aircraft 5-89 V. U. Meter Protection Philip Whitney 12-92 "REAC" Computer Reliability Bernard Loveman 3-79 REMOTES CONTROLS 3 -Channel Remote Amplifier W. W. Blair 12-93 Designing a High Speed Relay A F. Bischoff 10-84 Automatic Remote Amplifier Setup Henry C. Lovell 3-93 Designing an Electro -Thermal Relay John J. Dietz 9-65 Emergency Remote Equipment T A. Hildebrand 9-75 Industrial Applications of Electronic Equipment Extra Remote Amplifiers Stafford E. Davis 6-138 in the Automotive Industry A Forman 1-62 Improved Remote Control for Push Button Xmtrs ..A. Sichel 9-74 Industrial Applications of Transductors R J. Radus 4-78 Remote Control for Pushbutton Xmtr Philip Whitney 2-120 Master Selective Control System 6-109 Remote Record Start Device James S. Newland 10-89 Indicator 5-82 Remote Switching Panel Harold Schaaf 5-81 NBS Shaft Displacement Single Channel Transistor Remote Amplifier ....Robert Flory 3-114 New Electronic Thermostat at NBS 5-82 Elliott Full 4-96 Remote Con. Sys. for Bdcst. Xmtrs S Van Wambeck 11-94 Small Preamplifier for Remote Recordings Remote Unit for Sportscasts Ed Miller 9-89 Stand-by AC Power for Remote Amplifiers ..Emanuel Farber 4-97 Simple Follow -Up System Henry B. Weisbecker 7-57 Use of Microwave for Industrial Control W. C. White 11-85 TURNTABLES 12-93 AND MEETINGS Converting Turntables to "45" Richard W. Johnston CONVENTIONS Multispeed Turntable & Needle Stephen Popp 9-74 Electronic Conference, Preview of 5-69 Non-Slip Turntables Van Murray 5-106 Airborne Preventing 45 rpm Disc Slippage Stephen Popp 8-108 Audio Engineers Sixth Annual Meeting 10-137 A. Dodge 5-80 IRE National Convention Preview, 1954 3-70 Turntable Brush for Cleaning Stylus George International Instrument Show, Preview of 9-81 NARTB Conference, Preview of 5-68 DIRECTORIES National Electronics Conference, Preview of 1954 10-72 8-65 1954 Electronic Industries Directory WESCON 1954 Product Finding Index 6-195 6-210 BROADCASTERS Product Listings CUES FOR Brand & Trade Name Index 6-303 Consulting Engineers 6-308 CIRCUITS Engineering Societies 6-309 Automatic Program Line Changeover Circuit...G. H. Brewer 9-74 Electronic Distributors 6-309 CD Cluster Control Unit Edward J. White 12-92 Manufacturers' Localizer Index 6-323 Console Modification W. W. Blair 5-81 IRE Professional Engineering Groups 4-101 Constant Resistance Meter Circuit A C. Hudson 10-88 "Reps" & Distributors Serving the West Coast Electronic Cue Circuits J N. LaFreniere 1-89 Industries 8-106 Eliminating Tube Hum Peter H. Van Milligan 11-104 A Roster of Associations in the Electronic Industries 4 -Insert Harmonic Suppression Edward J. White 3-92 West Coast Electronic Industries Directory 8 -Insert Monitor Amplifier Forest J. Pinkerton 4-96 Muting Pick Up Thomas F. Lindsey i1-104 GENERAL Obtaining Maximum Modulation Stafford E. Davis 5-80 Remote Cue System Charles K. Chrismon 10-89 Dry Run Your Plant 7-51 Talkback Circuits J N. Lafreniere 5-80 Electronic Engineering Associations and You 4-69 Video Chopper William E. Morrison, Jr. 7-75 Electronic Future-Fact and Fantasy 10-65 Wireless "Third Line" John F. Cleary 10-89 Fear of the Unknown 7-51 Fellow Awards for 1954 Announced by IRE 1-116 INDICATORS Great Job Done by NTSC, The 2-65 How West Coast Firm Meets Labor Shortage 8-72 Air Monitor Problem & Baby Industry Danger Signals 6-91 (Transmitter) Sitter M. St. Jean 8-83 It's Later Than You Think 12-71 Automatic Time Signal F H. Frantz 9-100 Let's Solve our Own Problems! 3-67 Carrier Interruption Clocks Lyman W. Packard 11-77 Look to the West 8-61 Conelrad Alarm B Allen 4-96 Major Armstrong Dies 3-196 Remote Antenna Current Meter Louis N. Seltzer 2-80 Military Equipment & Reliability 11-61 Testing Harmonic Radiation Gerald W. Lee 1-110 New Look in Plant Sites, A 5-63 Xmtr. Failure Alarm & Monitor Charles M. Sparks 3-92 Off Dead Center 8-61 Undermodulation Monitor Racine Watkins 11-76 Only the Beginning 8-61 Ralph Huffman 6-121 Patent News 2-56 Visual Monitor 6-84 MAINTENANCE, TESTING 7-48 Salute to International Standardization, A 11-61 Additional Note on Coaxial Line Leaks W. A. Miller 8-108 Stop Wasting Engineers! 9-57 Checking Distortion Analyzers T A. Prewitt 10-88 Techniques for Electronic Mapping of the Brain ..A. Tunturi 8-66 Checking Station Frequency David L. Dodd 11-77 The Years Ahead Alfred N. Goldsmith 10-80 Cure for Tube That Screams Like Eagle! Sain Liles 5-106 TV Around the World 10-114 Equipment Trouble Lights F H. Frantz 10-88 West Coast Societies E. P. Gertsch 8-64 Extending Tower Beacon Lamp Life B G. Finkbeiner 5-81 What's Ahead for '54 1-61 Field Strength Meter Support Don V. R. Drenner 10-89 Locating DA Faults Russel Grambsch 4-97 GOVERNMENT ELECTRONIC & COMMUNICATIONS EQUIPMENT Plastic Spray Saves Work John F. Cleary 8-82 Push Button Switches Arch Slater 12-92 100 Points for Electronic Design Engineers 11-68 Renovation of Variable Pads L E. Ryan 7-75 Advance Work in Electron Tube Reliability H E. Sorg 8-84 Aircraft -Electronic Progress 1953-1954 Albert J. Forman 5-66 MISCELLANEOUS Applications of Integrator Type Signal Enhancers C A. Strom & J. A. Fantoni 2-98 Anti -Fading Conelrad Alarm Robert Holt 12-93 Behavior of Electronic Equipment in Vehicular Transporta- Automatic Overload Reset Stafford E. Davis 8-82 tion G. K. Guttwein, F. K. Priebe & S. M. Jee 12-94 Broadcast to PA Transition J C. French 9-100 DYSEAC-New Electronic Computer 8-91 Calculating Line Costs Quickly Gene Rider 10-88 Guided Missile Launching Connectors ..L. Baird & H. Upston 5-70 Clock Synchronization Francis J. Bock 3-93 Low -Level FM Altimeter 4-93 "Cues File" Henry C. Lovell 10 -loo Military Equipment & Reliability 11-61 Fabricating Copper Line L. B. Day. Jr. 4-96 NBS Cathode Emission Tracer 7-76 Halo for the Tower Sam Liles 4-96 NBS Shaft Displacement Indicator 5-82 136 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 Go from breadboard to Printed Circuitry FAST! ALDEN COMPONENTS MAKE IT AS SIMPLE AS THIS - 651T 653T 41'i G54T ,(t... ..iderinr - No plier,-No iwi.iinr Move your circuitry into compact vertical planes by staking Alden Ratchet -Slot terminals onto Alden Prepunched Ter- minal Mounting Cards in any desired pat- tern. Four styles of Terminals hold any type component, provide for wiring on both sides. With prepunched terminal cards, ratchet -terminals and card mounting sockets, engineer has tremendous flexibility 'o O to build up circuitry and arrive at simplified printed - CARD- card in his left hand. MOUNTING SOCKETS As you move from wire stage LABORATORY WORK KITS GET YOU STARTED Add Alden Card Mounting Sockets that THESE O O O to printed circuitry, use Alden hold tubes vertically, and you end up O O Terminal Card and Staking Tool Kits mount Terminal Card with vertical circuitry units that snap Stamped Jumper Strip you can lay in or model shop. Kit No 25. 18 into Alden 2", 4" or 8" Basic Chassis out le any pattern you eventually circuitry your lab side by side like pages in a. book. want to print. sockets, 200 terminals, 5 sets cards and components $12.00. Kit No. 26 Staking Tool $12.50. From here it's a simple step to fully automatized cir- printed Send for Kits today! cuitry-with the option of retain- ing Ratchet Terminals to form solder cups where heat sensitive 2123 N. Main St.. components prevent dip soldering. ALDEN PRODUCTS CO. Brockton 64, Mass. CHANGEABLE CHASSIS The Speed -Chassis is a flexible breadboard assembly with interchangeable socket arrangements which can be mounted on a relay rack. Dust cover and panel are . . . about the ad- available to make successful breadboard assemblies vantages of PRECI- both permanent and neat. SION COIL BOBBINS Four insulated tie -point strips and one grounded tie - . . about what goes into them to make them point strip are provided. Individual plates are avaiable, better - the research, the materials, the precision with holes already punched, to fit all needs. In addi- tion, three sizes of blank plates are cataloged. workmanship. Learn these facts to improve your coils. IMMEDIATE DELIVERY Send for your copy of this informative PRECISION V BOBBIN bulletin ... write today! PRECISION PAPER TUBE CO. SPECIFIC J PRODUCTS 2057 West Charleston Street, Chicago 47, Illinois 14515 DICKENS STREET Plant No. 2: 79 Chapel St., Hartford, Conn. SHERMAN OAKS 4, CALIF. Also Mfrs. of Precision Paper Tubes TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 157 NBS Spurs Research In Radio Propagation 9-82 New Abrasive Process Speeds Component Production New Developments at Bureau of Standards -V 10-144 R R. Gretter 12-98 New Military Field Radio 8-89 On Copper Clad Laminates 12-104 Parachute Telemetering 7-76 Printed Circuit Capacitor Design Joseph F. Sodaro 12-79 Timing System for Guided 8-89 Printed Circuit Soldering Techniques F A. Andrews, Jr. 12-75 Missiles Printed Crossed -Field Deflecting Coils A. V. J. Martin 12-82 Standardization of Printed Circuit GOVERNMENT PROCUREMENT Materials W. Hannahs, J. Caffiaux & N. Stein 2-68 R. Goodykoontz 12-74 Electronic Procurement -Production Directory 10 -Insert Universal Printed Circuit, A J Military Contract Awards 9-122 10-124 RADAR 11-143 5-66 Procurement 1955 Aircraft -Electronic Progress 1953-1954 Albert J. Forman in Maj. Gen. David H. Baker 10-28 Multi -Purpose Radar Test Set Amasa Pratt 6-115 System for Air Traffic Control J McLucas 7-70 INSTRUMENTS, MEASUREMENTS, TEST METHODS Radar Recording An Automatic Antenna Pattern Recorder L Lechtreck 11-88 RECORDING AND TRANSCRIBING Curve -Tracer Test Set for Vacuum Tubes ..Elmer H. Niehaus 2-90 An Automatic Antenna Pattern Recorder.. Lawrence Lechtreck 11-88 Cuvette Densitometer 10-116 Bibliography of Magnetic Recording 1900-1953....Alfred Jorysz 7-54 Designing Instrument Rectifiers ..Edward L. Pagano 5-88 Frequency Response Characteristics of Magnetic Determining Cap. Leakage Resist. & Dielectric Tape Walter T. Selsted & Ross H. Snyder 9-80 Soak E Molloy 8-90 High -Density Digital Data Recording Edward J. Armata 7-68 Diode Noise Generator for UHF Measurements Level -Indicating Record and Control Instruments R Coles 7-62 W. K. Squires & H. L. Newman 2-82 Magnetic Recording-State of Art W. Selsted & R. Snyder 8-94 Equip. for Testing Elliptically Polarized Antennas..C. Bradford 8-70 New Test Tape for Magnetic Recoiders Julius A. Konins 4-88 Evaluating Shielded Enclosures Richard B. Schulz 2-75 Radar Recording System for Air Traffic Control...J. T. McLucas 7-70 The Geodimeter-An Electronic "Eye" for Measuring Recording TV on Magnetic Tape Bernard F. Osbahr 1-81 Distance C E. Granqvist 9-68 Tape and Disc Recording System Charles K. Chrismon 7-65 How to Test NTSC Color with B & W RETMA 5-77 Charts W. Whalley 3-82 Video Magnetic Tape Recorder Industrial Applications of Electronic Equipment in the Automotive Industry Albert J. Forman 1-62 REFERENCE LIBRARY SERIES Level -Indicating Record and Control Instruments ....R. Coles 7-62 *l-A Roster of Associations in the Electronic Industries 4-Insert Limitations of Voltage Doubling Method in Rating Instruments #2-Circuit Symbols 6-Insert H. B. Conant 12-80 Directory 10-Insert Locked Oscillators for Test Equipment Leonard S. Cutler 8-77 .#3-Electronic Procurement -Production Low -Distortion FM Demodulator and Deviation Meter J J. Hupert, S. Torode & A. M. Reslock 5-72 STATISTICS Magnetron Stability Tester H. Bennett & A. Kiriloff 3-93 1953-1954 Statistics of the TV -Radio-Electronic Industries 1-78 Measuring Cavity Resonator "Q" Mark -Is Nowo" oazci i- ' Totals January through December page 3 Measuring Time -Delay in Pulse Circuits Melvin H. Murphy 9-72 10-114 Microwave Production Testing R J. Bingham 11-81 TV Around the World Multi -Purpose Radar Test Set Amasa Pratt 6-115 NBS Cathode Emission Tracer 7-76 TELEMETERING New 7-11 KMC Sig. Gen. Yields Valuable Design Hints A. Fong 8-92 FM/FM Telemetering, Pt. II W. J. Mayo -Wells 1-85 New Color Stripe Generator for TV Stations 5-122 Parachute Telemetermg 7-76 New Developments at Bureau of Standards -V 10-144 Ruggedized FM Telemetering Transmitter R G. Spann 4-94 New Resistor Voltage Coeff. Tester L Rosenthal & A. Louis 9-62 8-83 New Test Tape for Magnetic Recorders Julius A. Konins 4-88 Timing System for Guided Missiles Noise Analyzer for Deposited Carbon Resistors...A. Allmacher 6-102 Plant Noise Surveillance John K. Hilliard 8-73 TELEVISION, COLOR Plating Quantity Indicator for L -Band CBS' "205" Color Tube 8-134 Wavegufdes Martin Davidson & Nicholas S. Rahal 9-76 "Chromatron" in Production 6-369 Portable Calib. Standard Checks Test Panel Accur.....F. Lingel 9-86 COLOR-TV-Glossary of Terminology, Equipment Power Rating of R-F Coaxial Cables R Soria & J. Krisilas 2-71 & Systems 10-Insert Precision Transistor Test Compatible Color Signal Content and Equipment R Johnson, D. Humez & G. Knight, Jr. 2-74 Transmission E S. White & M. H. Kronenberg 4-80 Surface -Barrier Transistor Measur. & Appl. R Turner 8-78 How to Test NTSC Color with Black -and -White System for Making 3-D Vectorcardiograms 2-95 RETMA Charts W. B. Whalley 3-82 Techniques for Electronic Mapping of the Brain A. Tunturi 8-66 Manufacturing Color TV Tubes 2-89 Transistor Frequency Standard J Smith & M Carnnbell 12-'4) New Color Stripe Generator for TV Stations 5-122 Wide -Band UHF Sweep Frequency Generator R D. Bogner 9-60 New 19 Color Tube 4-168 Wide Range Signal Generator, A.....P. Lerman & M Snedeker 11-82 RCA's -inch TELEVISION, UHF -VHF MAGNETIC MATERIALS & AMPLIFIERS Automatic Production of TV Sets 10-79 Effect. Permeabil. of Cylindrical Iron Cores R Lafferty 2-84 Color -TV Tubes Set Makers Problem! 2-111 Ferrite Characteristics at Radio Frequencies R Harvey 6-110 Compatible 3-D TV 1-152 Frequency Response Characteristics of Magnetic Contouring TV Antenna Patterns L O. Krause 4-90 Tape Walter T. Selsted & Ross H. Snyder 9-8') DuMont Opens New Tele -Centre 7-86 Industrial Applications of Transductors R. J. Radus 4-78 Electro -Optical Image Processing System 3-91 Magnetic Recording-State of Art W. Selsted & R. Snyder 8-94 High -Efficiency AM Radiation from High Television Manufacturing Magnetic Tape Albert J. Forman 11-86 Towers Glenn D. Gillett 2-96 "Leningrad" T-2-Modern Russian TV Receiver 1-90 MANUFACTURING Multiple Unit Antennas With Skew M. W. Scheldorf 6-122 Recording TV on Magnetic Tape Bernard F. Osbahr 1-81 100 Points for Electronic Design Engineers 11-68 Self -Shielding PM Focus Units S L. Reiches & R. O. Gray 2-93 Automatic Picture Tube Metallizing Unit 4-100 Switch Tuned UHF -VHF Antenna Guy Hills 1-93 Automatic Production of TV Sets 10-79 Tube Selection Increases Sig. Cap. of TV Rcvrs R. Horner 10-70 Grids for Single -Gun Color Tubes 8-81 Tunable CW Magnetron Designed for UHF D E. Nelson 9-78 Industrial Applications of Electronic Equipment in the Automotive UHF -VHF Printed Circuit Diplexer Ansel Gere 3-101 Industry Albert J. Forman 1-62 Vari -Focal TV Lens John Radick 5-87 Manufacturing Color TV Tubes 2-89 Video Magnetic Tape Recorder 5-77 Manufacturing Computers for Aircraft 5-89 Manufacturing Magnetic Tape Albert J. Forman 11-86 TRANSISTORS Microwave Production Testing R J. Bingham 11-81 New Abrasive Process Speeds Component Production Commercial Tetrode Transistors 5-83 Robert R. Gretter 12 -OR Design Criteria for Transistor Feedback Amps. S Ghandhi 3-94 New Automatic Electronic Assembly System 9-88 Designing a Transistor Sonar On Copper Clad Laminates 12-104 Preamplifier R V. Fournier & H. Terl=anian 11-78 "Stacked Tubes" in Production 8-69 Designing Transistor Relaxation Oscillators S I Kramer 5-78 Transistors for Machine Tool Control 6-103 Graphical Methods Speed Transistor Power Amplifier Use of Microwave for Industrial Control 11-85 Design R F. Shea. Pt. I, 6-116; Pt. II, 7-72 Low -Pass Duplexing System for High Frequency Pulse MICROWAVES Transmitters William Hartsfleld & Richard Silberstein 2-76 Philco Develops "Surface -Barrier" Transistor 1-87 Measuring Cavity Resonator "Q" Markus Nowogrodzkf 6-97 Precision Transistor Test The Microwave Gyrator-A New Circuit Element....C. Hogan 11-64 Equipment R Johnson, D. Humez & G. Knight, Jr. 2-74 Microwave Production Testing R J. Bingham 11-81 Recent Developments in Silicon Fusion Transistors..R. A. Gud- Microwaves on West Virginia's Turnpike P J. Brewster 11-74 mundsen, W. P. Waters, A. L. Wannlund & W. V Wright 12-7e New 7-11 KMC Sig. Gen. Yields Valuable Design Hints A. Fong 8-92 Self -Oscillating UHF Transistors Hans E. Hohmann 4-75 Rotary Joints for Microwaves J Guerraera & J. Fisch 11-91 Surface -Barrier Transistor Measur. & Appl. R Turner 8-78 Three -Dimensional Microwave Lens Glen P. Robinson 11-73 Transistor Frequency Standard J Smith & M. Camnbell 12 -'II Use of Microwave for Industrial Control W. C. White 11-85 Transistor Reliability in Low Power Audio Uses F Dukat 10-77 Transistorized Magnetic Microphone 3-91 PAGE FROM AN ENGINEER'S NOTEBOOK Transistorized Wrist Radio 2-79 Transistors for Machine Tool Control 6-103 #24 "Filter Element Nomographs" Ralph Davidson 2-87 Trend to Transistors in New Equipment 7-74 #25 "Reactance Nomograph' Joseph F. Sodaro 3-89 #26 "Critical Damping Nomograph" Robert T. Moore 5-90 TRANSMITTERS #27 "Bandpass Filter Homographs" Ralph Davidson 6-113 #28 "Squashed RF Coils Save Space" I. Gottlieb 10-87 New Military Field Radio 8-89 #29 "Printed Circuit Capacitor Design Joseph F. Sodaro 12-79 Remote Control System for Bdcst. Xmtrs. ..S. Van Wambeck 11-94 A Ruggedized FM Telemetering Transmitter R G. Spann 4-94 PRINTED CIRCUITS TUBES, ELECTRON Automatic Production of TV Sets 10-79 Design for a Printed Subminiature I -F Amp. Advance Work in Electron Tube Reliability Harold E. Sorg 8-84 B. Raboy & J. Endicott 12-88 Broad Applications for New Transducer 11-67 How to Prepare Printed Circuit Artwork Jack Bayha 12-97 Curve -Tracer Test Set for Vacuum Tubes ....Elmer H. Niehaus 2-90 158 TELE -TECH 8. ELECTRONIC INDUSTRIES December 1954 Completely Insulated even the hinge pin! GRAYHILL Alligator Type Test Clips They cannot short! THE HINGE PIN IS ENCLOSED IN NYLON TUBING TO INSULATE IT FROM THE CUR- Miniaturization means fewer physical sizes to RENT CARRYING MEMBER-FINGER GRIPS ARE cover a large capacitance range. Non -wire lead capacitors can be made even smaller. MOLDED PHENOLIC. SILVER CONTACT POINTS (.008" THICK) PROVIDE LOW RESISTANCE CONTACT-APPROX. .0015 OHM. CUR- RENT CARRYING MEMBERS ARE SILVER miniature -in size only PLATED-LEADS SOLDER EASY. When your design says miniature and your specifications say quality 543 Hillgrove Avenue, La Grange, Illinois Phone: Fleetwood 4-1040 - here's the combination... The Corning Fixed Glass Capacitor is approximately one "I third smaller than other kinds of equal capacity. In per- i 1 formance, the Fixed Glass Capacitor has most of the ad- vantages of mica-plus some special features of its own. PRINTED You'll find a lot about their performance in the way they're made. Layers of conductor and dielectric are 1I sealed together at high temperature and pressure to form a 1 CIRCUITS rugged monolithic unit. The seal cannot be altered nor can 1 properties be changed short of destroying the capacitor. IM MMMMM OW IMB IMB You can use Corning Fixed Glass Capacitors at tem- peratures to 125° C. and higher, with proper voltage USECO announces expanded produc- de -rating. The temperature coefficient remains the same tion facilities in a separate new plane after repeated temperature cycles and it is held within nar- devoted exclusively to production of row limits over a wide temperature range with very little Printed Circuits Etched Circuits variation between capacitors. Capacitance drift is close to Terminal Boards (Standard and Custom Built) zero. Usually it's less than the error of measurement. Moisture can't enter these Fixed Glass Capacitors. In- Our additional facilities permit MASS PRO- sulation resistance is high. Dielectric absorption is low. DUCTION techniques without forfeiting the QUALITY or FAST DELIVERY for which And you can get a variety of sizes and shapes. Because USECO is noted. of its unique construction, the Corning Fixed Glass Capaci- tor allows wide latitude of equipment design. We can make Printed and etched circuits in sizes to 18"x capacitors to your electrical and physical specifications. 18". Samples on request. We meet all Mil What's more, single, self -supported units can be designed Specs. Complete line of Standardized Electronic for high voltages or high capacitances. Series parallel Hardware. 24 -hour service on quotations. combinations extend the range still further. Write today for further information. For more information about the remarkable advantages of Corning Fixed Glass Capacitors, please write. wire MU M MM MMMMM MMM MIN or phone us. 1 1 I I U. S. ENGINEERING CO. CORNING GLASS WORKS, CORNING, N.Y. 1 521 Commercial St., Glendale 3, Calif. 1 New Products Division 1 rr Areaes.rtauucir c GZid II. «1 eiva TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card on last page. 159 Electron Tube Grid Currents 11-70 TUBES, TV PICTURE & CRT Foreign Tube Design Techniques T Briggs & F. Michael 7-58 Tube Metallizing Unit 4-100 G -Curves and Degenerative Amplifiers Keats A. Pullen 4-86 Automatic Picture 8-134 P Cheilik 12-84 CBS' "205" Color Tube Glow Transfer Tunes tor Counting Circuits Set Makers Problem! 2-111 Magnetron Stability Tester H. Bennett & A. Kiriloff 3-96 Color -TV Tubes 6-369 "Stacked Tubes" in Production 8-69 "Chromatron" in Production -Gun Color Tubes 8-81 Trochotrons-A New Family of Switching Grids for Single 2-89 Tubes Harald Romanus & Hannes Alfven 6-91 Manufacturing Color TV Tubes 10-70 RCA's New 19 -inch Color Tube 4-168 Tube Selection Increases Sig. Cap. of TV Rcvrs. R. Homer R. Gray 2-93 Tunable CW Magnetron Designed for UHF D E. Nelson 9-78 Self -Shielding PM Focus Units S Reiches & 1954 AUTHOR INDEX L., Jr.-Electronic Power for Synchrocyclotron 4-98 ALFVEN H.-Trochotrons-A New Family of Switching Tubes 6-94 KORNBLITH, 5-78 ALLMACHER, A.-Noise Analyzer for Deposited Carbon KRAMER, S. I.-Designing Transistor Relaxation Oscillators Resistors 6-102 KRAUSE, L. O: --Contouring TV Antenna Patterns 4-90 ANDREWS, FRED A.-Printed Circuit Soldering Techniques 12-75 KRISILAS, J. G.-Power Rating of R -F Coaxial Cables 2-71 ARMATA, EDWARD J.-High-Density Digital Data Recording 7-68 KRONENBERG, M. H.-Compat. Color Sig. Content & Transmiss. 4-80 BAIRD, LESLIE-Guided Missile Launching Connectors 5-70 2-84 BAKER, Maj. Gen. DAVID 11.-Procurement in 1955 10-28 LAFFERTY, R. E.-Eff. Permeability of Cylindrical Iron Cores BAUER, B. B.-Designing Min. Unidir. Ribbon Microphone.... 7-66 LANNAN, P. E.-A Wide Range Signal Generator 11-82 BAYHA JACK-How to r'repare Printed Circuit Artwork 12-97 LECHIRECK, L.-An Autornauc Ant. Pattern Recorder 11-88 BEAVEIISON, W.- Techniques for Designing Pressure LINGEL, F.-Port. Calib. Standard Checks Test Panel Accuracy 9-86 LOUIS, A. Resistor Voltage Coefficient Tester 9-62 Microphones 5-84 S.-New 2-79 BENNETT H. S.-Magnetron Stability Tester 3-96 LOVEMAN, BERNARD-"REAC" Computer Reliability BINGHAM R. J.-Microwave Production Testing 11-81 BISCHOFF, A. F.-Designing a High Speed Relay 10-84 MARTIN, A.-Printed Crossed -Field Deflecting Coils 12-82 BLAINE, ROBERT F.-Designing Scale Model Aircraft for MAYO -WELLS, W. J.-FM/FM Telemetering, Pt. II 1-85 Antenna Analysis Pt. I, 9-84, Pt. II, 10-90 MAY, C. D.-Doubling Single Sideband Channel Capacity.... 6-126 BOGNER R. D.-Wide-Band UHF Sweep Freq. Generator .... 9-60 McLUCAS, J.-Radar Recording System for Air Traffic BRADFORD, CARROLL W.-Equipment for Testing Control 7-70 Elliptically Polarized Antennas 8-70 MEDILL, J. --Designing Min. Unidir. Ribbon Microphone 7-66 BREWSTER, P. J.-Microwaves on West Virginia's Turnpike... 11-74 MICHAEL, F. R.-Foreign Tube Design Techniques 7-58 BRIGGS, T. B.-Foreign Tube Design Techniques 7-58 MILLER, ED --Remote Unit for Sportscasts 9-89 BURNELL, LEWIS G.-Variable Toroidal Inductors 10-68 MOLLOY, E.-Capacitor Leakage Resistance & Dielectric Soak 8-90 BYCER, BERNARD B.-FM Altimeter-Audio Amplifier Design 6-124 MONTANI, A.-Capacity Commutator Eliminates Friction Contacts 3-76 CAFFIAUX, J.-Standardization of Printed Circuit Materials... 2-68 MOORE, R. T.-Page from an Engineer's Notebook #26 CAMPBELL MARK-Transistor Frequency Standard 12-90 "Critical Damping Nomograph" 5-90 CARLEY, W. J.-Multilayer Distributed Constant Delay Lines.. 5-74 Designing DC Voltage Reg. for Computers 6-106 CHASKIN, W. S.-New Carrier System Links All Transmission MURPHY, M. H.-Measuring Time -Delay in Pulse Circuits 9-72 Media 8-74 CHEILIK. P.-Glow Transfer Tubes for Count. Circuits 12-84 NELSON, D. E.-Tunable CW Magnetron Designed for UHF 9-78 CHRISMON, CHARLES K.-Tape and Disc Recording System... 7-65 NEWMAN, H. L.-Diode Noise Generator for UHF Measurements 2-82 CLEMENS, JOHN F.-Gain-Stabilized 1-r' 'rransfo er 12-87 NIEHAUS, ELMER H.-Curve-Tracer Test Set for Vac. Tubas 2-90 COLES, R.-Level-Indicating Record and Control Instruments.. 7-62 NOWOGRODZKI, MARKUS-Measuring Cavity Resonator "Q" 6-97 COLLINS, T. B., Jr.-Compandors Boost Voice Freq. Circuits... 9-70 CONANT, H. B.-Limitations of Voltage Doubling Method in OSBAHR, BERNARD F.-Recording TV on Magetic Tape 1-81 Rating Instruments 12-80 CUTLER, LEONARD S.-Locked Oscillators for Test Equipment 8-77 PAGANO EDWARD L.-Designing Instrument Rectifiers S -E8 PHINNEY, T. W.-"Vagabond" Wireless Microphone System 3-86 DAVIDSON, M.-Plating Quant. Ind. for L -Band Waveguides .. 9-76 PRATT, AMASA-Multi-Purpose Radar Test Set 6-115 DAVIDSON, RALPH-Page from an Engineer's Notebook #24 PRIEBE, F. K.-Behay. of Electr. Equip. in Vehic. Transp. 12-94 Filter Element Nomographs" 2-87 PULLEN, KEATS A.-G-Curves and Degenerative Amplifiers.. 4-86 Page from an Engineer's Notebook #27 "Band ass Filter Nomographs" 6-113 RABOY, B.-Design for a Printed Circuit Submin. I -F Amp. 12-88 DIETZ, JOHN J.-Designing an Electro -Thermal Relay 9-65 RADICK, JOHN-Vari-Focal TV Lens 5-87 DUKAT, F. M.-Transistor Rel. in Low Power Audio Uses .... 10-77 RADUS, R. J.-Industrial Applications of Transductors 4-78 REICHES, S. L.-Self-Shielding PM Focus Units 2-93 ENDICOTT, J.-Design for a Printed Circuit Submin. I -F Amp. 12-88 RESLOCK, A.-Low-Distortion FM Demod. & Deviation Meter 5-72 ROBINSON, GLEN P.-Three-Dimensional Microwave Lens... 11-73 FANTONI, JOSEPH A.-App. of Integrator Signal Enchancers 2-98 ROMANUS, H.-Trochotrons-New Family of Switching Tubes 6-94 FISCH, JEROME-Rotary Joints for Microwaves 11-91 ROSENTHAL, L.-New Resistor Voltage Coefficient Tester 9-62 FONG ARTHUR-New 7-11 KMC Signal Generator 8-92 FORMAN, ALBERT J.-Aircraft-Electronic Progress 1953-1954 5-66 SAVET, PAUL H.-Analog Computing by Heat Transfer 2-101 Industrial Applications of Electronic Equipment in the SCHAAF, HAROLD-"Stairway" Echo Chamber 7-61 Automotive SCHELDORF, M. W. Multiple Unit Antennas With,Skew 6-122 Industry1-62Tape 11-86 Design Techniques 3-98 Manufacturing Manetic SCHLICKE, H. M.-Passive Broadband Thermistors: Comp. for Electr. Control & Meas. 4-72 SCHULZ, RICHARD B.-Evaluating Shielded Enclosures 2-75 FOURNIER, R. V.-Designing a Transistor Sonar Preamplifier 11-78 SELLECK, R.-Designing DC Voltage Reg. for Computers 6-106 SELSTED, W.-Freq. Response Character. of Magnetic Tape.... 9-80 GARIANO, WILLIAM F.-Designing Inductively Coupled Traps 4-83 Magnetic Recording-State of the Art 8-94 GERE, ANSEL-UHF-VHF Printed Circuit Diplexer 3-101 SHEA, R. F.-Graphical Methods Speed Transistor Power GERTSCH E. P.-West Coast Societies 8-61 Amplifier Design, Pt. I.... 6-116 Pt. II 7-72 GHANDHÌ S. K.-Design Criteria for Transistor Feedback SILBERSTEIN, R.-Low-Pass Duplex. Syst. for Hi-Freq. Amplifiers 3-94 Pulse Xmtrs. 2-76 GILLETT, GLENN D.-High-Eff. AM Rad. from High TV Towers 2-96 SLATE, M.-Resonance Effects in Tubular Feedthru Capacitors 6-98 GOLDSMITH, ALFRED N.-The Years Ahead 10-80 SMITH, J. H.-Transistor Frequency Standard 12-90 GOODYKOONTZ, J. R.-A Universal Printed Circuit 12-74 SNEDEKER, M. L.-A Wide Range Signal Generator 11-82 GOTTLIEB I.-Page from an Engineer's Notebook #28 SNYDER, R.-Freq. Response Charact. of Magnetic Tape 9-80 "Squashed RF Coils Save Space" 10-87 Magnetic Recording-State of the Art 8-94 GRANQVIST, C. E.-The Geodimeter 9-68 SODARO, JOSEPH F.-Page from an Engineer's Notebook #25 GRAY, R. 0.-Self-Shielding PM Focus Units 2-93 "Reactance Nomograph" 3-89 GRETTER, R. R.-New Abrasive Proc. Speeds Como. Prod. ... 12-98 Page from an Engineer's Notebook #29 GUDMUNDSEN, R. A.-Recent Developments in Silicon Fusion "Printed Circuit Capacitor Design" 12-71 Transistors 12-76 SORG, H. E.-Advance Work in Electron Tube Reliability 8-84 GUERRAERA, JOHN-Rotary Joints for Microwaves 11-91 SORIA, R. M.-Power Rating of R -F Coaxial Cables 2-71 GUTTWEIN, G. K.-Behavior of Electronic Equipment in SPANN, R. G.-A Ruggedized FM Telemetering Transmitter 4-94 Vehicular Transportation 12-94 SPERGEL, J.-Thermoplastic Insul. Tri -Axial Pulse Cables.... 10-74 SQUIRES, W.-Diode Noise Generator for UHF Measurements 2-82 HAND, GEORGE C., Jr.-Computer Circuits for High Temp..... 1-82 STAINBROOK, R. I.-New Antenna Coupler for UHF Circuits 8-86 HANNAHS, W.-Standardization of Printed Circuit Materials... 2-68 STEIN, N.-Standardization of Printed Circuit Materials 2-68 HARTSFIELD, W.-Duplex System for High Freq. Pulse Xmtrs. 2-76 STROM, C., Jr.-App. of Integrator Type Signal Enhancers 2-98 HARVEY, ROBERT L.--Ferrite Characteristics at RF 6-110 HASTINGS, C. E.-"Raydist" Applied to Off -Shore Exploration 2-114 TENZER M.-Thermoplastic Ins. Tri -Axial Pulse Cables 10-74 HERMAN E. B.-Calculating Impedance of Co -Axial Lines 11-92 TERKA14IAN, H.-Designing a Transistor Sonar Preamplifier 11-78 HILLIARD JOHN K.-Plant Noise Surveillance 8-73 THOMAS, R. K.-Calculating the Range of Mobile Systems 6-108 HILLS, GUY-Switch Tuned UHF -VHF Antenna 1-93 TORODE, S.-Low-Distortion FM Demod. and Deviation Meter 5-72 HOGAN, C. L.-Microwave Gyrator-New Circuit Element.... 11-64 TUNTURI, A.-Techniques for Electronic Mapping of Brain.... 8-66 HOLLMANN, HANS E.-Self-Oscillating UHF Transistors 4-75 App. 8-78 HORNER, R. G.-Tube Selection Incr. Signal Cap. of TV Rcvrs. 10-70 TURNER, R.-Surface-Barrier Transistor Measur. & HUMEZ, D.-Precision Transistor Test Equipment 2-74 HUPERT, J. J.-Low-Distortion FM Demod. and Dev. Meter 5-72 UPSTON, HARLAN-Guided Missile Launching Connectors 5-70 JEE, S. M.-Behavior of Electronic Equipment in Vehicular WALKER, A. P.-Conelrad-Practical Operating Considerations 6-104 Transportation 12-94 WANNLUND, A.-Recent Devel. in Silicon Fusion Transistors 12-76 JOHNSON, R.-Precision Transistor Test Equipment 2-74 WATERS, W.-Recent Devel. in Silicon Fusion Transistors ... 12-76 JORYSZ, A.-Bibliography of Magnetic Recording 1900-1953 7-54 WEISBECKER, HENRY B.-Simple Follow -Up System 7-57 WHALLEY, W.-How to Test NTSC Color with B & W KIRILOFF, A. A.-Magnetron Stability Tester 3-96 RETMA Charts 3-82 KNIGHT G., Jr.-Precision Transistor Test Equipment 2-74 WHITE, E.-Compatible Color Signal Content & Transmission 4-80 KOCH, J. F., Jr.-Computer Circuits for High Temperatures 1-82 WHITE, W. C.-Use of Microwave for Industrial Control 11-85 KONINS, JULIUS A.-New Test Tape for Magnetic Recorders 4-88 WRIGHT, W.-Recent Devel. in Silicon Fusion Transistors 12-76 TELE -TECH & ELECTRONIC INDUSTRIES December 1954 160 - Digital Subharmonic Oscillator Computer (Continued from page 86) YOU TOO CAN Marrison in 1933, electronic en- gineers have apparently been almost HAVE THESE! Techniques entirely unaware of this signal - Were the source of tlhese imported generating technique. televvision lenses which greatly increase Applied to the In this oscillator, the necessary camera versatility. Complete the range -4 design, development and synchronizing signal is obtained cf your TV camera lenses with these application of simply by previously unavailable focal lengths. coupling a quartz crystal Supplement to an ordinary the lenses you are now blocking oscillator, using for increased versatility and by means of a third transformer performance. Military Radar winding. Alternatively, the crystal Fire Control Systems can be connected across either the grid or plate winding of the trans- ANGENIEUX former, or connected directly be- Aircraft Control and RETROFOCUS Navigation Systems tween grid and plate. Coupling by means of a third transformer wind- wide angle lens Electronic ing seems preferable, however, since (35mmfocal length) it avoids d -c voltage on the crystal f2.5. Focusing Business Systems and permits grounding the rotor of mcunt with iris dia- a trimmer condenser placed across phircgm. Highest The successful application of the crystal. resolution for Hughes airborne digital com- Division ratios as high as 10,000 to sharpest images. puters to high speed aircraft fire 1 have been obtained only with a control problems has opened up few crystals. Such extreme ratios an entire new area for these would probably seldom be of prac- MEYER digital computer techniques. tical value; a small change in circuit PRIMOPLAN Similar equipment is now un- constants might cause the funda- der development in the Advanced mental frequency to change from (7 _ m m focal Electronics Laboratory to apply 1/10,000 to 1/10,001 of the crystal lenglth) 11.9. Focus- such digital systems to modern frequency, for instance, and such a ing mount with iris business information handling. small change in frequency diaphragm. Longer could thar normal focal go easily undetected with ordinary length for universal Areas include equipment. Division ratios of several apps ication., LOGICAL DESIGN hundred are readily obtained, how- COMPONENT DEVELOPMENT ever, and can be maintained with PROGRAMMING high stability if supply voltages are MEYER MAGNETIC RECORDING held reasonably constant. Crystal - TELEPHOTO CIRCUIT DESIGN controlled signals can thus easily be INPUT & OUTPUT DEVICES generated at frequencies much lower (253mm focal SYSTEMS ANALYSIS than those of generally available lengtlh) f5.5. In fo- crystals. The wide range of possible cusing mount with Engineers division ratios means that a desired iris diaphragm and fundamental frequency can be ob- built-in lens shade. and The light weight tained from any of a large number cons'ruction per- of Physicists crystal frequencies. Conversely, a mits a balanced single crystal can be used to give turre action. crystal -controlled output at any of Computer activities embrace sys- a large number of fundamental fre- planning and analysis, tems de- quencies. The upper limit of block- All Lenses Fully sign and development, system ing -oscillator fundamental frequency Guaranteed engineering and component de- is determined by the characteristics for velopment. Experience in these of the pulse transformer; this limit areas, as well as in application of appears to be above 200 kilocycles Optical Quality electronic digital computers, is with a typical transformer. desirable but not essential. Ana- and Top lytically inclined men with back- Performance grounds in systems work are required for this phase. Gudeman Buys Dilectron Write today for our compete price list of Gudeman Co., electronic compo- a'1 of our special lenses to television cam- eras-28m,m through 250nm. Samples for Scientific and nents manufacturer, has purchased test purposes available on request. Engineering Stafi Dilectron, Inc., 2661 So. Myrtle St., Monrovia, Calif., manufacturer of ceramic capacitors. The Dilectron PONDER & BEST Hughes plant is Gudeman's 5th plant and TELELENS DIVISION will be known as the Dilectron Div. Importers of Fine Photographic Equipment RESEARCH AND DEVELOPMENT of LABORATORIES Gudeman Co. The main factory is at 340 W. Huron St., Chicago 10, Ill., 814 North Cole Avénue Culver City, Los Angeles County, Calif. Hollywood and the other 3 are in Chelsea, Mich., 38, California Assurance is required that relocation of applicant will not disrupt an urgent military project. Los Angeles, and Sunnyvale, Calif. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use dnquiry card on last page. 161 Computer Conference The ANSWER (Continued from page 68) to FRIDAY, DECEMBER 10 ADJACENT CHANNEL "Numerical Solution of Differential Equa- tions," Herbert M. Gurk, Morris Rubinoff, M'nre School of Electrical Engrg, Univ. of Pa. Jnsiriimenl "Applications of Automatic Coding to Small /NTERFERENCt Calculators," Leroy D. Krider, Applied Mathematics Div., U.S. Naval Ordnance Lab. "Automation of Information Retrieval," J. W. Perry, Battelle Memorial Institute. "Message Storage and Processing with a Magnetic Drum," A. P. Hendrickson, J. L. Hill, G. I. Williams, Engrg. Research Switches Associates Div., Remington Rand, Inc. "Analysis of Business Application Problems on IBM 650 Magnetic Drum Data Process- ing Machine," George W. Petrie III, In- ternational Business Machines Corp. "Small Digital Computers and Automatic Optical Design," N. A. Finkelstein, Bausch & Lomb Optical Co. ''Computation of the Performance of Deci- sion Element Circuits by Means of the IBM CPC," B. F. Cheydleur, Minnesota Electronics Corp., L. P. Gieseler, H. L. Stevens, U.S. Naval Ordnance Lab. TERMINAL CARD MOUNT GUARANTEES NORMAL RECEPTION in the most extreme cases.Mounted externally on TV receiver.This trap has returned thousands of TV view- ers to otherwise lost markets. meeting the Moderately priced. . . engineer's demand ADVANCE ELECTRONICS CO. 8510 North End Ave. Oak Park, Mich. in a hurry... BUILD Proinishefessiondal CABINETS Closeup view of new terminal card mounting F system which can be moved easily from the Custom built from a large layout stage through breadboard, pilot runs IN YOUR OWN SHOP and production. Pre -punched terminal cards, WITH card mounting sockets, and ratchet terminals variety of stock parts... comprise the elements. They mount up into compact vertical planes. As volume grows outstanding performance mounting boards become printed circuits. in a hurry . . . there's a C.E.S. switch that will fill Used in Many Government approved your requirements, too. Installations Write for catalog 175. Terminal card mounting system being used to mount circuitry for plug-in chassis and larger plug -In units. Same basic elements as shown above are used. Alden Products Co., 117 N. Main St., Brockton, Mass., is supplier. The Widney-Dorlec CINEMA ENGINEERING CO. Cabinet System, DIVISION AEROVOX CORPORATION consisting of a series New RS Electronics Plant of pre -fabricated, dura) 1100 CHESTNUT STREET BURBANK, CALIF. die-cast corners, extruded dura) sections and other RS Electronics Corp. has opened special components, now its new lab. and factory on Portage makes it possible to build modern, fully-radiused Ave. in Palo Alto, Calif., to manu- cabinets to any set of dimensions without special NEW YORK OFFICE: facture radar scanners and engage tools! 101 PARK AVENUE in the fields of electronic miniaturi- For Free Catalogue & Price List, zation, product design, electronic write Dept. TT -12 BRITISH INDUSTRIES CORPORATION automatic production, and etched 164 Duane Street New York 13, N.Y. and printed circuitry. 162 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 DESIGNED AND DEVELOPED BY SPECIALISTS FOR PRINTED CIRCUIT OPERATIONS ...specified for the usual ... demanded for the FvENDIP" SOLDER udusual VULCAN POTS 16 Crucible sizes High Fidelity thermostat control-adjustable 150-600 F. Surface Temperatures do not vary beyond 2 ' F. Localized "hot spots" completely eliminated. "GTC" Transformers for Replaceable heavy-duty heating elements. television receiver applica- tions ... custom -designed for high quality at mini. mum cost + 4 "GTC" Trani formers for industrial anc commercial applications ... accurately engineered and fully recog- nlzed for finett quality. SEND FOR FREE, DETAILED SPECIFICATIONS p VULCAN ELECTRIC COMPANY, DANVERS 28, MASS. Manufa_turers specify "GTC" . . for audio uses, commun cation. radar de. vices, test equipment. transmitters, and various NEED other electronic -controlled INSTRUMENTS TO SOLVE devices. ELECTRONICPROBLEMS "GTC" Military Transform. ers . designed to meet rigid government specifica- tion; and to perform under the most severe and RADA -SWEEP contin. MARKA-SWEEP RF -P uou; Rodor IF Amplifier operating conditions. WRITE TV Tuner Alignment Alignment MIL T-27 and JAN -T27. FOR FACTS I Skilled engineering techniques rake_ GTC a > source for transformers in h gzlje specialized ir MEGA -MATCH RADA -PULSER and extremely unusual applicatoes. Utilization Meosurement of Radar IFTronsient of these techniques resn_ts i s create- depend- - Reflection Coefficient ELECTRONIC Testing ability, quality and better ccs.act_ca INSTRUMENTS Our completely+ selcontained plant's modern equipment guararbes transformer production :9 in any quantity, a meet your requirements. We welcome your irrgz.ry cnd will supply produc- tion samples :,bars deeired. MEGA -PULSER CALIBRATED Transient Testing MEGA -SWEEP Video Amplifiers Wide Ronge Sweeping GENERAL KAY ELECTRIC COMPANY Oscillator Single Dial Tuned CONSULT THIS LATEST CATALOG FOR THESE TRANSFORMER COMPANY AND NUMEROUS OTHER INSTRUMENTS serving industry <_in:e 1928 KAY ELECTRIC CO. 18240 Harwood Avenue, Homewood, Illinois (Suburb o= Chicag)) 14 MAPLE AVE. PINE BROOK, N. 1. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 For product information, use inquiry card an last page. 163 FORD INSTRUMENT COMPANY PR ECISION A -C Rate (Continued from page 62) Generators Lieutenant Colonel Herbert H. French, U. S. Air Force, was recently elected Director of the Electronics Pro- ductions Resources Agency, Department agcl of Defense. single -shaft David A. Nadel, former sales en- gineer, has been promoted to the posi- servo packages tion of sales manager in Loral Electron- ics Corp., 794 E. 140 St., New York, N.Y. Priorly, Mr. Nadel was associated offered in 60cy and 400cy models with the American Machine & Foundry, output extremely stable, linear units with high voltage Inc., electronic division. available temperature compensated for wide ambient range These a -c rate generators are designed for any use which requires a high degree of accuracy in the linear translation of rotational motion into voltage. They are especially valuable in servo systems to stabilize responses, and can be provided in convenient single -shaft packages with a wide variety of precision servo motors. FOR FULL DETAILS IN ILLUSTRATED BRO- CHURE, WRITE TODAY. ADDRESS BOX TT -> FORD INSTRUMENT COMPANY rà DIVISION OF THE SPERRY CORPORATION E. A. Freed 31-10 Thomson Avenue, Long Island City 1, N.Y. 33 D. A. Nadel Edwin A. Freed has been made gen- eral sales manager of General Instru- ment Corp. Formerly operational head and sales manager of the Elizabeth, N.J. headquarters division, Mr. Freed will now be in charge of all products made JUNIOR by General Instrument and its manu- facturing subsidiaries, including its F. W. Sickles and Elizabeth divisions. His PROJECT office will be in Elizabeth. Jack Powers has been appointed sales manager of Edwin I. Guthman & Co., Inc., 15 S. Throop St., Chicago, Ill. ENGINEERS where he will promote product sales, manage representation, service custom- ers, and be responsible for all sales. Mr. Powers was formerly a representative in the Chicago area. Donald W. Jackson was recently ap- pointed national merchandise manager Type 01-1529 Excellent opportunity advancement for the Dage Television Div., Thompson for Products, Inc., Cleveland Rd., Cleveland, YES-Hermetically with leading manu- O. His work will include the appoint- facturer of coils and ment of distributors, and the develop- Sealed CLASS H filters in N. Y. City ment of merchandising, promotion, and area. Familiarity direct mail programs. Open Type Transformer with coils and filtered desired. Irving G. Rosenberg, vice president networks B. DuMont Laboratories, Clif- POSSIBLE ONLY WITH of Allen College education. ton, N. J., has been assigned the ex- ecutive responsibility to direct the Com- munication Products Division, 1500 Main Ave., Clifton. He will continue to direct the government manufacturing Designed for long life at "Hot Spot" temper- tube divisions. atures of 200° C, permitting weight and size and cathode-ray reductions over class A designs. Hermetically sealed (MIL-T-27) Grade 1, using exclusive Frank T. Gain has been appointed FormFlex process. BURNELL & CO.. INC. sales mgr. of Airdesign, Inc., Upper Ma sofa t r r of Inductive Equipment 45 Warburton Avenue Darby, Pa. He will set up nat'l repre- industrial RIRCRRII IRR/ISIORI1EP CORPORRTIOfl l' -- Yonkers 2, New York sentation for the company's AND RELAI El) NETWORKS and military products. Long Branch, Ni.. FIRST IN TORO,DS ELECTRONIC INDUSTRIES December 1954 164 For product information, use inquiry card on last page. TELE -TECH & TELE -TECH ADVERTISERS - DECEMBER, 1954 ADAMS & WESTLAKE CD. EBY 50 INC., HUGH H. 56 PHALO PLASTICS CORP. Agency-Henri, Hurst & McDonald, Inc. Agency-Renner Advertisers Agency-George 143 ADVANCE T. Metcalf Co. ELECTRIC & RELAY CO. 151 EITEL-McCOLLOUGH, , INC. 31 136 PHAOSTRON CO. 9 Agency-Allen, Dorsey & Hatfield, Inc. Agency-Conner-Jackson-Walker-McClure Adv. Agency-Teri ADVANCE ELECTRONICS Pall Advertising CO., INC. 162 ELECTRALAB, INC. 44 PHILCO CORP. Agency-Corbin Advertising Agency 63 Agency-Robert Hartwell Gabine Adv. Agency-Julian G. Pollock ADVANCE ELECTRONICS CO. 146 ELECTRICAL Co. INDUSTRIES 27 PHOTOCIRCUITS CORP. AEROVOX CORP. 128, 59 129 Agency-George Homer Martin Assoc. Agency-Kotula Co. Agency-Austin C. Lescarboura & Staff ELECTRONIC TUBE CORP. 122 POLARAD ELECTRONICS AIRCRAFT RADIO CORP. 112 Agency-Harry CORP. 46 P. Bridge Co. Agency-James R. Flanagan AAIRCRAFT Inc. Adv. Agency POLYTECHNIC RESEARCH 6 DEV. CO., INC. A TRANSFORM-BurkeER CORP.d 164 FORD INSTRUMENT CORP. 16, 164 36 Agency-Malcolm Agency-George Homer Martin Assoc. Severance Co. Agency-G. M. Busford Co. PONDER & BEST AIRPAX PRODUCTS CO. 146 FREED TRANSFORMER 161 CO., INC. 166 Agency-Elmer W. Ayer Advertising Agency-Rich-Lane Adv. Agency-Franklin Adv. Agency PRECISION PAPER TUBE CO. 157 ALDEN PRODUCTS CO. 157 Agency-Symonds, Agency-Richard Thorndike Agency MacKenzie & Co. Inc. PRESTO RECORDING CORP. 49 ALFORD MFG. CO., INC. 116 Agency-Lewin, Agency-Engineered GATES RADIO CO. 130 Williams & Saylor, Inc. Advertising Agency-Bartz Advertising Agency ALPHA METALS, INC. 120 Agency-Jules GENERAL ELECTRIC CO. 39 Wagner Advertising Agency --Maxon, Inc. ALTEC LANSING CORP. 124 RADIO CORPORATION GENERAL PRECISION LABS, INC. 15 OF AMERICA . . 4, 5, 117 Agency-Dan B. Miner Co. Inc. Agency-Burke Dowling Adams Inc. Agency-Al Paul Lefton Co. Cover 4 AMERICAN ELECTRICAL HEATER CO. RADIO 52 GENERAL RADIO CO. 125 MATERIALS CORP. Cover 2 Agency-F. B. Hubert Adv. Agency-Turner Counselors Agency-K. E. Morang Co. Adv. Agency AMERICAN LAVA CORP. 133 GENERAL TRANSFORMER CO. RAYPAR, INC. 141 Agency-Power and Condon 163 Adv. Agency-Sander Rodkin Adv. RAYTHEON MANUFACTURING CO. 2 AMERICAN PHENOLIC Agency Ltd. CORP. 33 GRAYHILL 159 Agency-Walter B. Snow & Staff, Inc. Agency-Burton Browne Adv. REEVES Agency-Merchandising Advertisers, Inc. HOFFMAN CORP. 118 ANDREW CORP. Agency-W. 8 GRAY RESEARCH & DEVELOPMENT CO. 119 H. Long Co. Inc. Agency-Burton Browne Adv. Agency-Taylor & Greenough Co. ANTARA CHEMICALS DIV., GENERAL DYESTUFF .CORP. 55 SAMPSON CHEMICAL Agency-R. T. O'Connell Co. & PIGMENT CORP. . 147 ARNOLD ENGINEERING CO. 42 HELIPOT CORP. 152 Agency-Sander Rodkin Adv. Agency Ltd. Agency-Walker & Downing, General Agency Agency-Darwin H. Clark Co. SARKES TARZIAN, INC. 135 ASTRON CORP. 121 HEPPNIER MFG. CO. 114 Agency-Argyle Wampler Adv. Agency---Conti Advertising Agency, Inc. Agency-Burton Browne Advertising SCHERR OPTICAL TOOLS, INC., GEORGE 152 AUDIO DEVICES, INC. 107 HERMETIC SEAL PRODUCTS CO. 113 Agency-Marvic Illustrations Agency-Rickard & Co. Inc. Agency-Art-Copy Advertising Agency SHALLCROSS MANUFACTURING CO. 6, 137 AUDIO INSTRUMENT CO., INC. 146 HOFFMAN LABORATORIES, INC. 17 Agency-Harry P. Bridge Co. Agency-Krone-Basch Assoc., Inc. Agency-Anderson-McConnell Adv. Agency SIGMA INSTRUMENTS, INC. 134 AVERY ADHESIVE LABEL CORP. 155 HOUGHTON LABORATORIES, INC. 106 Agency-Meissner & Culver, Inc. SPECIFIC Agency-Martin R. Klitten Co., Inc. Agency-Mellor Advertising Agency, Inc. PRODUCTS CORP. 157 HOUSTON FEARLESS CORP. 26 Agency-Allen, Dorsey & Hatfield, Inc. Agency-Taggart & Young Advertising SPRAGUE ELECTRIC CO. 70, 151 HUGHES AIRCRAFT CO. 65 Agency-Harry P. Bridge Co. BARDWELL & McALISTER, INC. 21 Agency-Foote, Cone SPRAGUE ELECTRIC Agency-Elmer W. Ayer Adv. & Belding CO. 12 HUGHES RESEARCH & DEVELOPMENT LABS. 150, 161 Agency-Stuart Sande Adv. BENDIX AVIATION CORP., PACIFIC DIV. 105 Agency-Foote, Cone & Belding STACKPOLE CARBON CO, eo Agency-Shaw Co. Agency-Harry BENDIX AVIATION CORP., P. Bridge Co. SCINTILLA DIV. 38 STANDARD ELECTRONICS Agency-MacManus, John & Adams, Inc. CORP. 37 Agency-Wehner Advertising Agency BERLANT ASSOCIATES 47 INTERNATIONAL RESISTANCE CO. 34, 35 Agency-Carson STODDART AIRCRAFT RADIO CO. 40 Roberts Inc. Agency-Arndt-Preston, Chapin, Lamb & Keen, Inc. Agency-Allen, BERNDT-BACH, INC. 150 Dorsey & Hatfield, Inc. STONE PAPER TUBE CO. Agency-Abbott Kimball Co. of Calif., Inc. 48 Agency-Robert M. Gamble, Jr. BLAW-KNOX CO. 61 STUPAKOFF CERAMIC & Agency-Ketchum, MacLeod & Grove, Inc. JACKSON ELECTRICAL INSTRUMENTS 10 MFG. CO. 22 BOMAC Agency-R. L. Conhaim Adv. Agency-Walker & Downing LABORATORIES, INC. Cover 3 SYLVANIA Agency-Larcom Randall Adv. JENNINGS RADIO MFG. CORP. 138 ELECTRIC PRODUCTS CORP. ... 45, 66 Agency-Cecil Presbrey BOURNS LABORATORIES 24 Agency-L. H. Waldron Adv. Agency & Inc. SYLVANIA ELECTRIC Agency-McCarty Co. JONES DIV., HOWARD 8., CINCH MFG. CORP. 152 PRODUCTS CORP. 139 Agency-Deutsch & Shea BRADLEY LABORATORIES. INC. 28 Agency-Symonds, MacKenzie & Co., Inc. Adv. Agency-Charles SYNTHANE CORP. 155 Brunelle Co. Agency-Arndt-Preston-Chapin-Lamb BRITISH INDUSTRIES CORP. 162 & Keen, Inc. Agency-Kaplan & Bruck Adv. BRUNO -NEW YORK INDUSTRIES CORP. 155 KAHLE ENGINEERING CO. 148 Agency-Jaman Advertising, Inc. Agency-Conti Advertising Agency, Inc. TELECHROME INC. KAY 115 BURKE & JAMES, INC. 148 ELECTRIC CO. 163 Agency-Powerad Co. Agency-William Futterman Adv. Agency-Felt Advertising Inc. TINNERMAN PRODUCTS KEARFOTT INC. 58 BURNELL & CO., INC. 19, 20, 164 CO., INC. 62 Agency-Meldrum & Fewsmith, Inc. Agency-Hicks & Greist, Inc. Agency-Western Advertising Agency, Inc. TRANSRADIO LTD. 144 KENYON TRANSFORMER BUSSMANN MANUFACTURING CO. 69 CO. 147 Agency-Reynell & Son Ltd. Agency-Picard Marvin & Redfield TUNG-SOL ELECTRIC INC. 67 KESTER SOLDER CO. 41 Agency-E. M. Freystadt Associates, Inc. Agency-Paul J. CAMERA EQUIPMENT CO. Steffen Co. TURNER CO. 153 25 KEYSTONE PRODUCTS CO. 123 Agency-J. M. Kesslinger & Assoc. Agency-W. D. Lyon Co., Inc. Agency-.Conti Advertising Agency, Inc. CANNON ELECTRIC CO. 111 Agency-Willard G. Gregory & Co. CBS-HYTRON 57 U. S. COMPONENTS INC. Agency-Bennett & Northrop, Inc. 23 LIBRASCOPE, INC. 144 Agency-Jarrett Advertising Agency, Inc. CHICAGO TELEPHONE SUPPLY CORP. 29, 30 Agency-Western Advertising Inc. U. S. ENGINEERING Agency-Burton Browne Adv. Agency, CO. 159 LOCKHEED AIRCRAFT CORP. 131 Agency-O. K. Fagan Advertising Agency CINCH MANUFACTURING CORP. 103 Inc. Agency-D. T. Campbell Inc. Ageins, LYNN ELECTRONICcy-Hal CINEMA ENGINEERING N RESEARCH CO. 153 CO. 162 Agency-Don Larson Advertising Agency-R. L. Power VARFLEX CORP. 109 CLAROSTAT MFG. CO., INC. 53 Agency-Barlow Advertising Agency, Inc. Agency-Austin C. Lescarboura & Staff VICTOREEN INSTRUMENT CO. 64 CLEVELAND CONTAINER CO. 7 Agency-Scheel Advertising Agency Agency-Nesbitt MAGNETICS, INC. 32 Service Co. Agency-Lando Advertising Agency VULCAN ELECTRIC CO. 163 CLIPPARD INSTRUMENT LABORATORY Agency-Roger 68 MEASUREMENTS CORP. 166 A. Poor Agency-S. C. Baer Co. Agency-Frederick Smith Adv. Agency COLLINS RADIO CO. 149 MELPAR, INC. 140 Agency-W. D. Lyon Co., Inc. Agency-Equity Advertising Agency WATERMAN PRODUCTS COMMUNICATION ACCESSORIES CO. 43 CO. 126 Agency-Carl Lawson Advertising Co. Agency-Abner J. Gelula & Assoc'ates, Inc. CORNELL DUBILIER ELECTRIC CORP. 132 WECKESSER CO. 166 Agency-Friend-Reiss Advertising WELCH SCIENTIFIC CO., W. M. 142 CORNING GLASS WORKS 143, 148, 159 NATIONAL VULCANIZED FIBRE CO. 11 Agency-H. A. Hooker Adv. Agency, Inc. WESTON ELECTRICAL Agency-Charles L. Rumrill & Co., Inc. Agency-Harris D. McKinney Inc. INSTRUMENT CORP. 127 Agency-G. M. Bastard CUNNINGHAM, SON & CO., JAMES 142 NEW HERMES ENGRAVERS, INC. 145 Co. Agency-Lester Harrison, Inc. WINCHARGER CORP. 51 Agency-W. D. Lyon Co., Inc. DAGE ELECTRIC CO., INC. ... 140 Agency-Jim Bradford Advertising DALE PRODUCTS, INC. 130 PAR -METAL PRODUCTS CORP. 145 Agency-Ayres While every precaution is taken to insure accuracy, & Associates, Inc. Agency-H. J. Gold Co. we cannot guarantee against the possibility of an DEJUR-AMSCO CORP. 54 PEERLESS DIV., ALTEC LANSING CORP. 149 Agency-Friend-Reiss occasional change or omission in the preparation Advertising Agency-Dan B. Miner Co. of this index. TELE -TECH & ELECTRONIC INDUSTRIES December 1954 165 HF Conference FREED (Continued from page 52) Af4, 4NEW sponsored by IRE, AIEE, URSI and giaidaiid /o4 the Natl. Bur. of Standards. The program of technical papers follows: PRECISION TEST 'INSTRUMENTS No. 1040 VACUUM Monday-Measurement of Transmission and TUBE VOLTMETER. Reception J- Self contained - A.C. Measurements Corporation F Presiding: B. Parzen, Olympic Radio & Tele- ` operated. High imped- v,s,on Co., Long Island City. N. Y. MODEL 80 ance - wide frequency. "Measurements and Components for Rectan- For use at audio and gular Multimode Waveguides" by D. An- supersonic frequencies. gelakos, Electronic Research Lab., Univ. of Cal., Berkeley, Cal. STANDARD SIGNAL No. 1010A COMPAR- /. "A Comparison Method for Tuning Wideband ISON BRIDGE. Self e '' TR Tubes" by H. Rickert, Wheeler Labs., contained - A.C. op- Inc., Great Neck, N.Y. GENERATOR erated. Ideal for labo-" -_ __ , o 'Radio Interference Measurement Tech- ratory and production niques" by L. Thomas, Bur. of Ships, Navy testing of resistors, 'c l Dept., Washington, D.C. 2 Mc. to 400 Mc. condensers and indus- f "Pattern Measurements of Large Fixed An- tors. tennas" by J. Shanklin, Collins Radio Co., Individually Calibrated Direct-Reading Dial Cedar Rapids, Iowa. .^, No. 1020B MEGOHM- "Accurate Radar Attenuation Measurements METER. DIRECT FREQUENCY ACCURACY: Z0.5 READING. Self con - Achieved by In -Flight Calibration" by F. twined-A.C. operated. Janza & R. West, Sand'a Corp., Sandia Base, Albuquerque, N.M. OUTPUT VOLTAGE: 0.1 to 100,000 1<.¡ . Electronically regulated _ "Use of Distribution Curves in Evaluating microvolts. supply, I megohm to Microwave Path Clearance," by B. Wheeler - 2 million megohms. -" & H. Mathwich, RCA Electronic Prods. OUTPUT IMPEDANCE: 50 ohms. N No. 1060 VACUUM Div., Camden. J. TUBE VOLTMETER. A MODULATION: Amplitude modulation ;,-,,,:e_ of Power 50 megohm input im- Tuesday-Measurement and 0 to 30%. Internal modulation 400 pedancewide frequen- LIT Attenuation and 1000 cycles. Provision for exter- cy range V.M. for use Presiding: E. W. Houghton, Bell Tel. Labs., nal pulse and amplitude modulation. at audio and super- t. Murray Hill, N.J. sonic frequencies. "6 KMC Sweep Oscillator," D. Alsberg, Bell POWER SUPPLY: 117 volts, 50/60 Tel. Labs.. Inc., Murray Hill, N.J. _ + No. 1030 LOW FRE- "Data on Temperature Dependence of X - cycles. 70 watts. QUENCY "9" INDI - Band Fluorescent Lamp Noise Sources" by le'-'s.5 -i, CATOR. DIRECT W. Mumford & R. Schafersman, Bell Tel. READING. Measures Labs., Inc., Whippany, N.J. Z: X & "Q" factor of coils, "Broadband UHF and VHF Noise Genera- MEASUREMENTS also inductances, dis- tors," W. Spencer & P. Strum, Airborne tributed capacity, im - Instruments Lab., Mineola, N.Y. ,d{ÿ ^ A pedances and dielectric "A Noise Meter Having Large Dynamic CORPORATION loss. Range," P. Strum, Airborne Instruments Lab., Mineola, N.Y. BOONTON NEW JERSEY No. 1110A INCRE- "Precise Insertion Loss Measurements Using MENTAL INDUC- Imperfect Square Law Detectors and Ac- D TANCE BRIDGE. For ! =^^ ' ' curacy Limitations Due to Noise," B. Wein- accurate testing of schel, Weinschel Engrg. Co., Inc., Kensing- communication and tel- :ii** ***rib ton, Md. un- -" evision components s._._ "Microwave Peak Power Measurement Tech- der load conditions. _ - niques." R. Henning, Sperry Gyroscope Co., Great Neck, N.Y. TRANSFORMERS & FILTERS Wednesday-Measurement of Impedance INDUC- Presiding: A. A. Oliner, Polytechnic Inst. of TOROIDAL Brooklyn, Brooklyn, N.Y. TORS. 60 CPS to I "Application of UHF Impedance Measuring MC. Also miniature in- Techniques in Biophysics," by H. Schwan ductors from' 1000 CPS Moore School of Electrical Engrg., Univ. of to your to 100 KC. Pa., Philadelphia, Pa. "Representation and Measurement of a Dis- OPEN WIRING PULSE sipative Four -Pole by Means of a Modified MILITARY Wheeler Network," by H. Altschuler, Mi- CABLE SUPPORT TRANSFORMERS. Con - etsidge crowave Research Inst., Polytechnic Inst. structed to MIL - T . of Brooklyn, Brooklyn, N.Y. PROBLEMS 27 specifications. De- "The Use of Concentric -Line Transformers signed for optimum in UHF Measurements," by W. Harris & pulse performance. J. Thompson, Radio Corp. of Amer., Harri- Use the son, N.J. MINIATURE AUDIO. "Figure of Merit of Probes as Standing Wave ALL NYLON sealed Detectors," by S. Rubin; Polytechnic Re- Hermetically - search & Devel. Corp.. Brooklyn, N.Y. and "NyGrip" constructed in accord- M. Wind, Microwave Research Inst., Poly- ance with MIL - T - 27 technic Inst. of Brooklyn, Brooklyn, N.Y. CABLE CLIPS specifications. "Characteristics of Microwave Comparators," by E. Matthews, Sperry Gyroscope Co.. for tough Great Neck, N.Y. conditions HERMETICALLY "A Comparison Method for Measuring Cavity and unusual SEALED COMPO- Q," by E. Mullen & P. Pan, General Elec- NENTS. Constructed in tric Co.. Syracuse, N.Y. heat, etc. accordance with MIL - T 27 specifications. Measurement of Frequency and Time Presiding: B. M. Oliver, Hewlett-Packard 3 Co.. Palo Alto, Cal. Use the "A Portable Frequency Standard for Navi- PRECISION FILTERS. gation," by P. Antonucci, Rome Air De- vel. Center, Rome, N.Y., & J. Israel. E. ETHYL CELLULOSE TO to I MC. CPS Mechling. & F. Merrill, Bell Tel. Labs., Murray Hill, N.J. rrEtholocrr "Locked Oscillators in Frequency Standards and Frequency Measurements," by J. Clapp, General Radio Co., Cambridge. CABLE CLIPS i Mass. for average HIGH FIDELITY. t/r DB "Measurement of the R -F Frequency of R -F 20 CPS to 30 KC. Pulses," by A. Bagley & D. Hartke, Hew- conditions lett Packard Co., Palo Alto, Cal. and maximum "An Instrument for Precision Range Meas- urements," by D. Beck, Hazeltine Elec- economy tronics Corp., Little Neck, N.Y. COMPLETE CATALOG ON REQUEST "6 KMC Phase Measurement System for Traveling Wave Tubes," by C. Angustine Send for details and FREE samples. FREED TRANSFORMER CO., INC. & A. Slocum, Bell Tel. Labs., Murray Hill, N.J. i.` 1726 Weirfleld St. "A Precision X -band Phase Shifter," by E. WECKESSER COMPANY .--Li..- rsu__...... rs 97 tv V i Barnett, Hewlett-Packard Co., Palo Alto, 5259 N. Avondale Ave. Chicago 30, III. Cal. 1954 166 For product information, use inquiry card on last page. TELE -TECH & ILECTRONIC INDUSTRIES December SILICON DIODES Bomac Silicon Diodes are manufactured to exceptionally high standards to assure electrical uniformity and mechanical stability. New design considerations and improved manufacturing techniques have resulted in X -and S -band crystals of increased burnout resistance and higher humidity resistance. eomac TOP PERFORMANCE UNIFORMITY STABILITY Max. Freq. Conversion Noise Max. IF Band Type (MC) Loss Ratio VSWR Impedance db (Times) (Ohms) S 1N21B 3060 6.5 2.0 - - S 1N21BR 3060 6.5 2.0 - - S 1N21C 3060 5.5 1.5 - - S 1N21CR 3060 5.5 1.5 - - X 1N23B 9375 6.5 2.7 - - X 1N23BR 9375 6.5 2.7 - X 1N23C 9375 6.0 2.0 1.50 325-475 X 1N23CR 9375 6.0 2.0 1.50 325-475 X 1N149 9375 5.5 1.5 1.25 325-475 X 1N230 9375 5.0 1.7 1.25 350-450 X 1N23DR 9375 5.0 1.7 1.25 350-450 Conversion Loss ± 0% The above diodes ma be IF Impedance -E 5 ohms supplied in pairs wherever Rectified Current . .. - O% their characteristics 411111031011te are RF Impedance (VSWR) Such that unbalance < 10% of ifJZ3t4 matched as follows: available power p UNIQUE PACKAGE PROTECTION For complete protection during shipment and storage Bomac has designed a reusable RF 8OMRC9123CR Protective Package which conforms with MfGD. 6Y MK LAU .lNC. MIL-ElB specification. Diodes stored in this package are completely protected no matter how many times they are handled after the original seal is broken. 'Pat. applied for Irft3(,k Irin c,)fwAr. r1AX tot INZ IN23ú Br v's We invite your in- Catalog on request. quiries regarding Write (on your com- ENGINEERING pany letterhead) BEVERLY, MASSACHJSETTS Dept. T-12, BOMAC IQ -IN DEVELOPMENT Laboratories, Inc. PRODUCTION GAS SNITCHING TUBES DIODES HYDROGEN THYRAT PONS DUPLEXERS MAGNETRONS Beverly, Mass. aOMAG MODULATORS CAVITIES I -ill 1 The RCA 21 -INCH COLOR PICTURE TUBE, the tube in your future, is here! Intensive RCA re- search brings you full-sized pictures of excellent clarity and brightness . . . makes production -line color TV a reality. Outstanding features of the new RCA-21AXP22 are: 21' round tube with aluminized phos- phor dot screen gives largest pic- ture in colcr TV, a full 250 square inches of brilliant color. Metal shell means lighter weight and greater mechan- ical strength. Thermally- compensated, spherical shadow mask permits uniform ex- pansion of mask for improved color regis- tration and brighter pictures. 700 deflection angle- combined with a short electron gun having improved resolution- provides a short tube which permits reduced cab net depth. RCA-21AXP22 21 -inch metal envelope electrostatic focus magnetic deflection magnetic convergence Three New RCA -Developed RCA-6B14- Receiving Tubes for Color TV Half-Wave Rec- RCA-6CB5- Tube tifier (Dam- Beam PowerTube per Diode) RCA-6BK4- (Horizontal -De- Sharp-Cutoff flection Amplifier) Beam Triode (Shunt Voltage Regulator) RCA pioneered and developed compatible color television RADIO CORPORATION of AMERICA ELECTRON TUBES HARRISON, N. J.