Volume 4 November, 1955 Number 3
LaPort Discusses Antenna Kadiutioti SECTION MEETING 'High-Lights Of Antenna Lore' NOVEMBER 15 "HIGH-LIGHTS OF Is Subject Of LaPort Talk ANTENNA LORE" In the Auditorium at 8 P.M. The third Fall 1955 meeting of the Long Island IRE Section will lia\ Stratford Avenue School as its speaker Mr. Edmund A. LaPort. Garden City liadio Corporation of America. The meeting will he held at the Stratford Pre-Meeting Film Avenue School. Garden City, on Tues- day. November 15. The talk, which is Auditorium, 7:35 P.M. titled "Hight-Lights of Antenna Pre-Meeting Dinner Lore," will be given at 8 P.M.. and will follow a pre-meeting film. At Howard Johnsons This month's speaker began his Jericho Turnpike, Mineola
career as a service technician for sta- 5.45 P.M. tion WJZ back in 1921. As cam- munications began to burgeon, Mr. LaPort went to G.E. for a short stay and then to Westinghouse where he PGMTT MEETING did radio transmitter design and NOVEMBER 29 served as station construction en- gineer. Subsequent work in single- "WAVEGUIDES FOR LONG- side band and asymmetric side band DISTANCE COMMUNICATION" floating carrier systers for program In the Auditorium at 8 P.M. transmission over power lines fol- lowed. In 1936 Mr. LaPort joined Stratford Avenue School RCA at Camden in charge of high- Edmund LaPort, Radio Garden City power transmitter engineering. Suc- Corporation of America ceeding this he was transferred to Pre-Meeting Dinner RCA Victor Ltd., Montreal, where he At Howard Johnsons served as Chief Products Engineer. The topic under discussion will in- He remained in this work until 1944 clude the basic concept of radiation Jericho Turnpike, Mineola \n he was called to New York to from linear conductors. Electric and 6 P.M. head up the engineering staff of the Magnetic dipoles will be described. newly formed RCA International Di- The discussion will proceed with the vision. In 1954 he was made Chief fundamental components previously NOTICE Administrative Engineer for Com- discussed combined into arrays to Please be reminded that Pro- munications. RCA. control radiation by wave-interference fessional Group meetings are Mr. LaPort has been interested in methods. The use of reflecting and open to all IRE members and interested non-members. The the studies of antenna since 1930. guiding surfaces for pattern con- Professional Group meetings The knowledge acquired over the trol are next considered. The final are not closed meetings; and years has been compiled in book topic will be pattern control by con- membership in the Professional form. "Radio Antenna Engineering" tori of wave velocity through elec- Group is not a requisite for published in 1952. tromagnetic lenses. attendance. The PULSE of Long Island The Institute of Radio Engineers Long Island Section SECTION OFFICERS Paul Hansel, Chairman David Dettinger, Vice-Chairman R. Page Burr, Treasurer Wilbert Frantz, Secretary EDITORIAL STAFF Walter Ruddy, Editor field engineers • electronic instrumentation Stuart Casper, Advertising Manager James F. Craib, Murry Heyert, Joseph McDonald, J. Arthur Plante- roth, James Randall, Associate Edi- announcing tors. Editorial and advertising deadlines are the first of the month preceding
JOSEPH RACKER COMPANY, Inc. associates Engineered-Wi'itiiig Consultants Specializing in the preparation of 170 Eo.t 80th St., New York 21, N. Y. THofolgo. 9-3023 manuals to government specifications 1 14 East Main St., Bogota, New Jeriey Diamond 2-5343 140 Nassau Street New York 38, N. Y. Worth 4 1463
WHEELER LABORATORIES, INC. Beta Electric Corp. • Budd • Stanley Co, Inc. • John Fluke Mfg. Co. • Hewlett • Packard Co. Consulting — Research — Development • Kay lab • Pime> Inc. • Sorenien & Co., Inc. • Vorian Aiioclatel R-F Circuits — lines — Antennas Microwave Components — Test Equipment Harold A. Wheeler and Engineering Staff Great Neck, N. Y. HUnter 2-7876 Page 2 ... The PULSE Meetings In And Around Long Inland
November 15, 1955 at 8 P.M. Long Island Section MANUFACTURERS REPRESENTATIVES FOR:
In the Auditorium ALLISON LABORATORIES • LABORATORY FOR ELECTRONICS Precision Variable Audio Filters 10 cps DC-10 MC Oscilloscope, Microwave Stratford Avenue School to 20 kc Oscillators, 10 MC Time Rate Indicator, Delay lines AREMAC- ASSOCIATES Garden City, N. Y. Oscilloscope Cameras • LABSCOPE, INC. DC 200 KC Oscilloscope, Calibrator "High-Lights of BRUSH ELECTRONICS COMPANY Direct Writing Oscillographs, Amplifiers, • MAGNETIC RESEARCH CORP. Antenna Lore" Audio and Acoustic Test Instruments, Tube less DC Power Supplies, Magnetic Digital Counters Amplifiers Edmund A. LaPort • NARDA CORP. CASCADE RESEARCH CORP. Frequency Meters, Waveguide Test Radio Corporation of America Microwave Ferrite Equipment Equipment, Bolometers, Thermistors DONNER SCIENTIFIC COMPANY • NJE CORPORATION Pre-meeting dinner at 5:45 P.M. Audio Oscillators, Wave Analyzers, Standard and Laboratory Grade Accelerometers, Analog Computers Regulated DC Power Supplies Howard Johnsons, Jericho Turnpike ELECTRO-INSTRUMENTS INC. • ROGER WHITE ELECTRON DEVICES Precision Direct Reading Digital Microwave Gas Control Tubes, Voltmeters, Ohmmeters Backward Wave Oscillators, Traveling Wave Tubes November 29, 1955 at 8 P.M. ELECTRO-PULSE, INC. • SERVO CORP. OF AMERICA Wide Range Pulse and Time Delay Servoscope, Servoboard, Amplifiers, Professional Group on Generators Infra Red Bolometers, VHF Receiver Microwave EMPIRE DEVICES PRODUCTS CORP. • SIERRA ELECTRONIC CORP. Noise, Field Intensity, Microwave Test Reflection Coefficient Meter, Directional Theory and Techniques Equipment Couplers, Carrier Voltmeters, Wattmeters Stratford Avenue School WHAT IS YOUR PROBLEM?—Ask your Bur/ingome FieW Engineer Garden City, N. Y. ROBERT CRANE "Waveguides for Long Distance Communication" A. C. Beck Bell Telephone Laboratories for Really ACCURATE November 10, 1955 at 7:30 P.M. Automatic Line-Voltage Regulation Professional Group on Aeronnautical and Navagational 5O Amperes Electronics (6 KVA) General Electric Auditorium Type 1570-A Lexington Ave. at 51st Street, N. Y. Automatic Line-Voltage Regulator: "Theory and Instrumentation of $465
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November 9, 1955 at 8 P.M. Northern New Jersey Section Hillside School GENERAL RADIO Company Montclair, New Jersey Branch Engineering Office in NEW YORK 90 West Street New York 6, New York "How Signals Get Telephone WOrth 4-2722 To and Through the Brain" GEORGE G. ROSS C. WILLIAM HARRISON Dr. W. S. McCulloch MIT November, 1955 Page 3 The Program SPOTLIGHT ON DETTINGER Committee A Sidelong Squint at Onr Section rice-Chairman By Dave Dettinger Our section Vice Chairman this ties have been seriously interfered The program planning committee year is David Dettinger of Wheeler with recently by his purchase of a is the group, newly formed this year, Laboratories. Inc.. in Great Neck. house in Port Washington. He now which aids the Section Vice-Chair- Dave, who is a Senior Member of performs his feats of strength by man in setting the direction of the IRE, served as Secretary of the Long cutting grass. gear's activities. Fortunately, at the Island Sub-Section for the 1949-50 committee's first meeting it was faced term, and was a member of the na- uitli having many excellent choices— tional IHE Tellers Committee in 1952. having, one might say. the embar- Dave received his U.S. in I'lusics rassment of choice. from St. Lawrence University, and Such a profusion of ideas comes continued his studies at M.I.T. He as no surprise when one knows the worked at lla/eltine Electronics Corp. io-ler of the Meetings and Papers in Little Neck from 1942 to 1945, Committee. Besides the Section of- went to Teleregister Corp. in New ficers. Paul Hansel, Page Burr and York City for two years, and return- Wilbur Frantz. the past chairman. ed to Long Island as Chief Engineer Bill Bailey, was on hand. Walter of Wheeler Laboratories in 1947. He Ruddy of the PULSE, Frank Willev became Vice President of the com- of the Lecture Series Committee, Al pany in 1954. Corwin, chairman of the PGI, and Dave's outside interests include ski- Joe Kearney, vice chairman of the ing (whenever he can find snow I. PG.YITT. were also there. In addi- volleyball (when there is no snow tion, there were present four com- and he can find a group to pla\, and tennis. HiDavs sporte Dettingers activi-, mitleemen assigned to represent spe- Wheeler Laboratories cific fields of activity of our rnem- hership. Dr. Rudolph Hutter of S\l- vania took the viewpoint of the scien- tists. Heinz Weichardt of Airhorne Instruments Laboratory represented educators and students. Art Koppel spoke for production and quality con- trol engineers. Whitne\n of the National Broadcasting Company re- presented the operations engineer. MODEL PC-100R An obvious advantage of longer range planning would be the better • Paired pulses 5 to 5000 microseconds interval, 50 cycles to 5 Kc. recur- chance of arranging symposiums rence rate with meter indication with outstanding experts. Also it • Width 1 microsecond, rise and decay times 0.1 microsecond, amplitudes should he possible to prepare sup- 0-75 volts open circuit, 220 ohm internal impedance • Polarities and amplitudes independently controlled, separate or mixed plementary materials and demonstra- outputs tions, and to coordinate more effec- • Sync internal or from external positive 10 volt trigger tively with the activities of other • Positive 50 volt sync output trigger coincident with fixed pulse, 220 groups. A hazard of advanced sched- ohm internal impedance uling, of course, is that opportunity • Time markers 1, 10 or 100 microseconds; negative pulses 0 to 10 volts, may not be left for timely topics. 220 ohms internal impedance • Amplitude calibration 60 cycle square wave, 0.1 to 100 volts in steps A second meeting of the committee • Model PC-100 cabinet mounted, PC-100R relay rack panel mounted is planned for early in January. Any Incorporates design of comments and suggestions from our HAZELTINE ELECTRONICS CORP. members before that time will be Model 1456 Senior Pulser greatly appreciated. Our objective is to provide the Long Island Section !TELETRONICS LABORATORY with technical programs of high • WESTBUR Y, L. I., N. Y. calibre and wide interest. MANUFACTURERm S OF ELECTRONIC INSTRUMENTS AND PRODUCTION TEST EQUIPMENT Page 4 The PULSE IMMEDIATE DELIVERY on a NEWTUBELESS! MAGNETIC AMPLIFIER AC LINE
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NEW YORK Tektronix, Int. FIELD OFFICE 49 Pondfletd Road, Bronxville 8, DEerfield 7-3771 Page 6 The PULSE Past issues of the PULSE have carried articles on this page outlining some of AIL's past history and future goals. This month we thought we would pass on to you a curve sheet from one of our young engineers, because it may be as useful to you as it has been to us.
System engineers working on mil- possible to realixe filters with the ilsiry problems these days are dis- hoped-for attenuation curve. A gen- covering more and more that a large eral minimum unloaded Q criterion percentage of their system involves proposed by Dislial was found to microwave circuits and components. agree well with experimental re- For instance, at AIL the microwave sults in the microwave region. This engineering effort on some of our criterion is currently being applied electronic systems projects is .'50% as a useful tool in narrowband (say to ;")0% of the entire engineering ef- less than 2%) filter design at AIL. fort on the project. We are finding Curves plotted from Dishal's mini- that a great deal of the microwave mum unloaded Q expression* are design effort is going into bandpass given in the figure below. They show filter design. There are some inter- that the required ratio of minimum esting and unique, problems con- unloaded Qu to desired filter QL nected with such design, as Jesse increases sharply with the number Taub discovered shortly after join- of coupled resonant elements and ing AIL in June 1!);")."). Jesse came the required peak to valley ratio. It from the Naval Material Laboratory has been found experimentally at in Brooklyn where he had done AIT. that the unloaded Qu must be work on microwave tubes and crys- I1/-; to 2 times higher than this mini- tals. He is now completing the re- mum value to reali/e a filter with a quirements for a doctorate in K.K. reasonably low insertion loss. These at Polytechnic Institute of Brooklyn curves therefore show that many and, as a member of the AIL team, microwave filters using resonant is directing part of an electronic elements filters of limited Qu could systems project requiring a great not possibly give the shape predicted deal of microwave engineering, and by the filter theories that assume es- specifically, microwave filter design. sentially infinite unloaded Q's for the resonant elements. In designing narrow bandpass *M. Dishal "Concerning the (0.1%) microwave filters in strip- Minimum Number of Resona- line, Jesse found that with maximal- tors and the Minimum I'nload- ly flai (critically coupled) or Tche- ed Q Needed in the Filter," bycheff (overcouplcd) response Electrical Com m tin i c a t ions, shapes in some instances it was im- vol. 'M, December 1!);">I.
Cut along this line if yon u'ish to retain this chart for reference.
RATIO OF MINIMUM UNLOADED Qu . REQUIKED TO FltlER QL AS A FUNCTION OF PEAK TO VAUEY RATIO
OL = i2, WHERE if IS THE OVERALL FILTER
3db BANDWIDTH n = NUMBER OF RESONANT ELEMENTS '
PEAK TO VALLEY (db| Odb PEAK TO VALLEY CORRESPONDS TO MAXIMALLY FLAT
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November, 1955 Page 7 Lecture Tickets Still Available
DIGITAL COMPUTER INSTRUMENTS SERIES IS UNDERWAY The fall lecture series on Digital Computers was launched on October 27, with a talk by Robert R. Everett on the "Philosophy of Stored Program Computers." The series continues on Thursday evenings at i :3() P.M. in the Stratford Avenue School. Garden City, N. Y. Tickets ma> still be purchased Kada-fiode RADA-NODE — Complete noise figure for the remaining lectures: the fee for the series is S4.00 for members and measuring set. 5mc. — 26,500 $1,395. $6.00 for non-members. Tickets may be obtained from your company repre- Mega-Nodes sentative or at the door. For further information contact Krwin Kappauf. 1346 Decker St.. Valley Stream: Telephone No. Tllden 4-9317. The second speaker is Dr. Grace M. Hopper. Director of Programming DIGITAL COMPUTER Research for Eckert-MauchK Divi- MICROWAVE MEGA-NODES-Calibroted LECTURE SERIES OUTLINE sion. Sperry Rand. Principles of log- Noise Sources at microwave. Available in ical choice, iterative loops, and sub- wave guide sizes 1200-1400 me. and October 27 2600-40,000 me. routines will be covered. The third RG-69/U $500. RG-51/U $295. PHILOSOPHY lecture will concern itself with Com- RG-48/U 295. RG-52/U 295. RG-49/U . 295. RG-91/U 350. puter Building Blocks, and will be RG-50/U 295. RG-53/U 350. Dr. Robert Everett, MIT presented by Robert D. Elbourn. Prices supply Electronic Computer Section. Nation- November 3 al Bureau of Standards. Mr. Elbourn PROGRAMMING has worked with digital magnetic re- cording, particular!) in the design of Dr. Grace Hopper. SEAC. Sperry-Rand Dr. Jan. Rajchman. RCA Labora- Mega-Sweep tories. Princeton, will talk on Mem- CALIBRATED MEGA-SWEEP Wide November 10 range, wide sweep for aligning RF and or\. Rajchman has special- IF amplifiers. Has calibrated freq. controls BUILDING BLOCKS ized in electron optics and comput- and single dial tuning. 50 kc.-950 me. ing devices, and has developed main Sweep width 40 me; output 100 mv. Mr. Robert Elbourn, $495. computing circuits, the selective elec- MODEL 111-A with zero level base line. Bureau of Standards trostatic storage tube, the magnetic 10 me. - 950 me. $575. core memory, and the electron multi- November 17 plier tube. The fifth lecturer. Dr. MEMORY DEVICES Samuel N. Alexander will discus* Input-Output Devices. Alexander is Dr. Jan Rajcliman. Chief of the Data Processing Systems Kada-ftlser. Sr. RCA, Princeton of the National Bureau of Standards. RADA-PULSER, Sr., video-RF pulse carrier The talk will cover paper tape de- generator. Carrier freq. 12-80 me. Pulse width, 0.2—20 mus. Rise delay time .03 December 1 vices, magnetic tape handlers, punch mus. rep. rate 400 to 4000 PPS $745. INPUT-OUTPUT card machines, and high speed print- ers. The closing lecture will be by DEVICES Dr. 11. R. Grosch. Manager of Inves- Dr. Samuel Alexander, tigations in the Gas Turbine Develop Bureau of Standards incnl Department of General Electric in Cincinnati. Grosch was head of Kilo-Q KILO-Q— Low frequency Q-meter, 20 cps December 8 the logical design group. Whirlwind to 1 me in five steps. Q-measure range II. M.I.T. Digital Computer Labora- 0 to 500; cal. eap. range 60 MMF to .1 MR ...... $695. APPLICATIONS tory. He has been responsible for the organization and operation of Dr. H. R. Grosch, ELECTRIC COMPANY large-scale computers. His lecture will GE, Cincinnati concern Applications. Dept. LI-4 14 Maple Ave., Pine Brook, N.J.
Page 8 The PULSE