MM partl DIRECTORY BY OPL, SYSTEMS COUNTY U POLICE 1S1pP,TE FIRE FORESTRYOpSp `p` O COMPANIES TO REVISED LISTINGS 1, 1949 4/ka feeZ means IessJnterference ...

AT HEADQUARTERS THE NEW RCA STATION RECEIVER Type CR -9A (152 -174 Mc)

ON THE ROAD THE NEW RCA CARFONE Mobile 2 -way FM radio, 152 -174 Mc

...you get the greatest selectivity with RCA's All -New Communication Equipment

You're going to hear a lot about selectivity from potentially useful channels for mobile radio communi- now on. In communication systems, receiver selectiv- cation systems. ity, more than any other single factor, determines the For degree of freedom from interference. complete details on the new RCA Station Re- This is impor- ceiver type CR -9A, tant both for today and for the future. and the new RCA CARFONE for mobile use, write today. RCA engineers are at your Recognizing this fact, RCA has taken the necessary service for consultation on prob- steps to make its all -new communication equipment lems of coverage, usage, or com- the most selective of any on the market today. To the plex systems installations. Write user, this means reliable operation substantially free Dept. 38 C. from interference. In addition, this greater selectivity Free literature on RCA's All -New now rhakes adjacent -channel operation a practical Communication Equipment -yours possibility - thereby greatly increasing the number of for the asking.

COMMUN /CAT/ON SECT/ON RADIO CORPORATION of AMERICA ENGINEERING PRODUCTS DEPARTMENT, CAMDEN, N.J. In Canada: R C A VICTOR Company limited, Montreal Á#ofher s with 8(11(011'

DlNews

ERIE'S FIRST TV STATION

Says EDWARD LAMB, publisher of "The Erie Dis- telecasting economics. 0 Station patch" and owner of TV Station WICU: "Du Mont equipment fulfills that bill. And so Du Mont - "In bringing the only telecasting service to Erie, WICU was, is and will continue to be Penna., we insist on five prerequisites: (1) Best picto- equipped." rial quality obtainable; (2) Adequate signal strength Regardless what your telecasting start may be- served; (3) Equipment operable by 0 throughout area leading metropolitan TV station or network studios, or previously- inexperienced local personnel; (4) Depend- again the small -town independent TV station -you can able service, regardless; and (5) Equipment that, with always count on Du Mont "know -how" for economically - minimum obsolescence, can be expanded in step with safe- and -sound guidance.

© ALLEN B. DU MONT LABORATORIES. INC

N. J. DU MONT NETWORK AND DU MONT LABORATORIES, INC. TELEVISION EQUIPMENT DIVISION, 42 HARDING AVE., CLIFTON, TELEVISION STUDIOS, NEW YORK 3, N. Y. WABD, 515 MADISON AVE., NEW YORK 22, N. Y. DU MONTS JOHN WANAMAKER AND PLANTS, PASSAIC AND EAST PATERSON, N. J. WTTG, WASHINGTON, D. C. STATION WDTV, PITTSBURGH, PA. HOME OFFICES Jullj 1949-formerly FM, and FM RADIO -ELECTRONICS 1 e/taileierei79.ryatt,a4e;toc WITH THIS The Most Sensitive FM Radio Ever Built FOR THE PUBLIC

Most Sensitive Longer Distance / No Interference No Static No Special Antenna Performance Because of high sensitivity, No whistles, no over-Even in the worst With Zenith's patented Superb reception brings in stations in fringe lap, no cross -talk, no storms. Only rich, Power -Line Antenna, even on weak signals. areas others miss. background hiss. glorious tone. just plug in and play.

Whatever has been your experience with FM -what- ever FM radio you have ever heard -Zenitht now asks The Super -Sensitive "MAJOR" you to listen to a new marvel of Radionict science. The lowest price ever for genuine This all -new Zenith Model is the climax of years 3995* Zenith- Armstrong FM! ... only of acknowledged leadership in genuine Zenith -Arm- strong FM -that hundreds of thousands know as true FM -the FM radio that leading FM stations over the nation rely upon to monitor and test their own broad- casts -truly the FM of the Experts! Now, in a new Super - Sensitive circuit that gives perfected performance even on signals too weak for ordinary sets to catch. *LOHE. RADIO So we say -hear, compare! Be prepared to hear the and TELEVISION most sensitive FM receiver you have ever listened to - a genuine Zenith -Armstrong receiver at a sensation- ally low price. *Suggested Retail Price. Prices subject to change without notice. 2 FM AND TELEVISION I .1 Announcing our new...

Formerly, FM MAGAZINE and FM RADIO -ELECTRONICS

VOL. 9 JULY, 1949 NO. 7

COPYRIGHT 1949, by Milton B. Sleeper

CONTENTS

INDUSTRY NEWS TV -FM -AM Set Production Compiled from figures released by the RMA 4

New Catalogs & Design Data Review of new products and equipment 6

What's New This Month RADIOPHONE 1. FCC's new plan for call letters 2. Policies of the Ad Hoc Committee (above) 3. National Mobile Radio System Is Formed VS 50 -1 -50 watt 4. Data on rodio sales by appliance dealers 8 Fixed Station. Oper- ates on 117v 60 cycles A.G. (25 -50 mega- cycles). Remote control MOBILE RADIO optional. Mobile Rodio Systems A discussion of potential expansion 13 (below) VM 30 -1 (25.50 mega - cycles) -30 watt. Compact Low -Power FM Portable Mobile Station. Howard V. Carlson 14 (not illustrated) UM 15 -1 (152 -162 meg- Operator License Requirements acycles)-15 watt (local T. J. Slowie 17 reception). Compact Mo- Letter from FCC Secretary bile Station. Radio Communications Services, Parts 18 New FCC rules and allocations COMPARE RAYTHEON'S Now Raytheon Radio- ADVANTAGES Mobile Radio News & Forecasts phone offers dependable NOISE -FREE RECEPTION Jeremiah Courtney 22 2 -way communication COMPACT -OUT OF SIGHT systems in both 25 -50 meg- OUT OF THE WAY SIMPLIFIED INSTALLATION Dynamotor Power Supplies acycle and 152 -162 meg- COMPARE RAYTHEON'S 25 acycle. Whatever your Robert W. Carter needs, you can be sure PERFORMANCE that there is a Raytheon LOWEST BATTERY DRAIN Directory of Mobile Radio Systems, Part 1 Radiophone to meet your LOW MAINTENANCE Corrected to June 15, 1949 27 requirements exactly - LONG LIFE manufactured to Ray- COMPARE RAYTHEON'S SPECIAL DEPARTMENTS theon's high standard of PRICE excellence in electronics. LOWEST PRICE IN THE INDUSTRY Professional Directory 10 Special .Services Directory 11 Spot News Notes 22 BELMONT RADIO CORPORATION A Subsidiary of Raytheon Manufacturing Company DESIGN AND CONTENTS OF FM AND TELEVISION MAGAZINE ARE THE COVER 5939 W. DICKENS AVENUE CHICAGO 39, ILLINOIS FULLY PROTECTED BY U. S. COPYRIGHTS, AND MUST NOT BE REPRODUCED IN ANY MANNER OR IN ANY FORM WITHOUT WRITTEN PERMISSION for Quotations and Information MILTON B. SLEEPER, Editor and Publisher Mail Coupon CHARLES FOWLER, Business Manager Belmont Radio Corporation 39, Illinois LILLIAN BENDROSS, Circulation Manager 5939 W. Dickens Avenue, Chicago SOPHIE FORTY, Production Manager I'd like to have full information on Raytheon Radiophone- Published by: FM COMPANY 25 -50 megacycle 152 -162 megacycle Publication O ff ice: 264 Main St., Gt. Barrington, Mass. Tel. Gt. Barrington 500 FM -TV Magazine is issued on the 20th of each month. NAME Single copies 25c- Subscription rate: $6.00 for three years, $3.00 for one Year in the U. S. A.- Canada, add 50c per year postage -foreign, add $1.00 ORGANIZATION per year postage. Contributions will be neither acknowledged nor returned unless accompanied ADDRESS and directions, nor will FM -TV Magazine be by adequate postage, packing, ' STATE t responsible for their safe handling in its office or in transit. CITY Entered as second -class 'natter August 22, 1946, at the Post Office, Great Barrington, hass.. under the Act 3 of March 3, 1879. Additional entry at the Post Office, Boston, hass. Printed in the U. S. .1.

MEMBER, AUDIT BUREAU OF CIRCULATIONS RADIO set production by RMA mem- times that of the same period in '48. Ex- bers during April, as indicated in the pressed in numbers, however, 31/2 times Production Barometer, portrays a con- 41,000 is still a very small figure to fused and unhealthy trend. TV and FM broadcasters, who are in the habit of sets combined still represent a very small counting network audiences in millions. number of units for an industry that FM followed AM sets to a new low. started the postwar period with such a The exact significance of this will not tremendous capacity for quantity pro- be clear until fall, when manufacturers duction. As for AM sets, April was at a will have had time to produce and pro- new low for the period starting January mote FM models competitive with the 1947. Dollarwise they have dropped to performance of Zenith's $39.95 receiver. -'"111111"' starvation level. This month, shaded areas on the FM The blocks showing average monthly blocks indicate the number of TV sets production sum up the situation realis- with FM broadcast circuits. RMA has tically. In 1947, average AM set produc- just added this figure in its monthly re- tion the first four months of the year ex- ports. In April, 47,264 TV -FM sets ceeded the average for the year by 5 %. were produced, or 28% of all TV models. In '48, those months exceeded the aver- We applied this 28% to TV figures for age fórAle year by 25 %. In '49 it is January, February, and March. reas4niatiteNtirapect that the total AM The year -end progress of TV cannot Sets produced will be under 5 million, a be assayed at this time, nor until the drop of 75% since 1947. FÇC's freeze is lifted, and the public has Television has climbed steadily but not registered its reaction to whatever alloca- spectacularly. Average production in tions plan is finally adopted lax the Corn- , t- - the first four months this year is :;1 mission.

-m. -

o o o 6m 5 HIGH FREQUENCY I a COMPONENTS

National offers a complete line of coils, coil forms and trans- 4-, MONTHLY -M rt - MONTHLY -1+ '- MONTHLY -A. AVERAGE AVERAGE AVERAGE formers for critical high fre- ó- 1947 1948 JAN. -APRIL '49 o quency work. These cofrlponents Om have been tested and proved -AM superior in performance in National's own world- famous communication equipment. Write Dep't 194 for complete catalog. !-34

o o o ß N N á e N -FM - TV

EST. 'i. 1914 NATIONAL o IL. COMPANY, Inc. JFMAMJJAS SOND FMAMJJASOND JFMAMJJASOND JFMAMJJA JFMAMJJASOND M A L O E N , M A S S A C H U S E T T S 4- 947 k 1948-s. <-TV 8 FM-TV 1949- FMSFM-AM >< AM 1949 4i TV, FM, and AM Set Production Barometer, prepared from RMA figures

FM AND TELEVISION YOUR telephone receiver should treat each tone in the voice alike; that is important to you, because proper balance makes pleasant listening and easy understanding. Naturalness in receiver perform- ance is pictured in a matter of sec- onds by the apparatus shown at left. The receiver is clamped in place and an oscillator feeds into it fre- quencies representing all talking tones. Then a bright spot darts across an oscilloscope screen leav-

It listens so You can hear better

ing behind it a luminous line which shows instantly the receiver's response at each frequency. It is precise; and it is many times faster than the old method of measuring receiver performance point -by- point and then plotting a curve. At Bell Laboratories, develop- ment of techniques to save time parallels the search for better methods. For each time an opera- tion is made faster, men are freed to turn to other phases of the Labo- ratories' continuing job - making your telephone system better and easier for you to use each year.

BELL TELEPHONE LABORATORIES PIONEERS IN THE RESEARCH OF FM RADIO AND TELEVISION, AND ACTIVE IN DEVELOPING IMPROVEMENTS IN BOTH FIELDS TODAY. July 1949--formerly FM, and FM H:»>lo-Li.EcrxoNlc, Li cric 1)4 r elopment Co., 3209 Humboldt 1,400-ohm recorder directly. Multiple ranges St.. /,os I e geles 31. are available. W. S. Macdonald Co., Inc., NEW CATALOGS 33 Telephone Type Relays: University Rd., Cambridge 38, Mass. & DESIGN DATA Design data and mechanical dimensions are VT Voltmeter: given in a new catalog for standard, mini- Designed for servicing audio and video re- ature, and special AC and DC relays, in- ceivers. Multi -range controls cluding afford mea- a series of interlocking relays. surements of resistance, and current and products listed here are described Phillips Control THEin new catalogs Corp., 612 N. Michigan voltage at DC or AC frequencies up to 500 and bulletins now avail- Ave., Chicago 11. able. Unless otherwise noted, they will be mc. Sylvania Electric Products, Inc., 500 Fifth Ave., New sent on request, without charge. Twin -Line Connectors: York 17. BROADCAST EQUIPMENT Polarized and non -polarized connectors for 4 -Beam Oscillograph: splicing 300 -ohm flat line, and terminal Equipped with Film Projector: a special K1027P11 cathode - and baseboard connectors, all in the form ray tube, it displays four related or un- Description and application data on a 35- of polystyrene blocks. These are handy and related phenomena simultaneously. Contains mm. projector designed for TV studios. much- needed items. Products Engineering complete controls and power supply. DaMont RCA Engineering Products, Camden, N. J. Co., 4753 N. Broadway, Chicago 40. Laboratories, Clifton, N. J. TV Transmitter: Miniature' Selenium Rectifiers: MANUFACTURING EQUIPMENT Are For upper and lower VHF bands, has 5 -kw. described in a 48 -page handbook giving Small Power Shears: video and 3 -kw. audio output. Video trans- dimensions, performance characteristics, and mitter employs mid -level modulation. Fed- circuits for applications to audio and video Floor mounted types, with 12- or 24 -in. blades, taking up eral Telephone & Radio Corp., Clifton N. J. receivers. Price 25c. Federal Telephone & to 16 -gauge sheet steel. Radio Corp., 900 Passaic Ave., E. Newark, Designed for " fast, economical production. HOME RECEIVERS N. J. Floor space 18 by 30 or 18 by 40 ins. O'Neil - Irwin Mfg. Co., Lake City Minn. FM -AM Receiver: Carbon Resistors: C -R Tube Sealing Machine: Six -tube table model features high- sensi- Of molded composition, in a new tivity series Armstrong limiter- discriminator FM rated at 2 watts. They are available Automatic machine has interchangeable circuit, in a Model 218. General Electric Co., complete range from 10 to 100,000 ohms, adapters to handle 12 tubes up to 16 -in. Electronics size Park, Syracuse, N. 1'. plus or minus 5, 10, and 20 %. Design is in or 16 tubes up to 122 -in. size per accordance with JAN specs. cycle.. Kahle Engineering Co ,Worth Ber- TV Size 11/16 in. Tuner: long by .3Ie in. diameter. Stackpole Car- gen, N. J. Replacement unit to fit the majority bon Co., St. Marys, Pa. of TV VACUUM TUBES sets. Covers 12 VHF channels. Standard TV Replacement Coil Products Co., 2329 N. Pulaski Rd., Transformers Tube Data: Chicago 39. Complete line of blocking oscillator, power, Nearly 50 subminiature tubes and 150 other and filament transformers and filter TV Distribution chokes, types, including magnetron, klystron,' rug- System: designed as replacments on all types of TV ged- design, transistor, hearing aid, trans- Amplifier and distribution unit receivers. Merit Coil & Transformer for opera- Corp., mitter, rectifier, and voltage-regulator tubes, tion from signals of 5,000 microvolts 4427 N. Clark St., Chicago 4,0. is de- are listed in a new chart which shows char- signed to operate up to 8 TV receivers in acteristics and base diagrams. Raytheon apartment house or store installations. Low -Wattage W.W. Resistors: Electro Mfg. Co., Newton 58, Mass. Engine('r;og & Mfg. Co., 627 W. Technical bulletin describes type BW wire - Ile'r,inJrine, i roit 1, 11ä!t. wound resistors of .5, 1, and 2 watts ca- TV Tube Compliment Chart: pacity, designed for high stability. Interna- AUDIO EQUIPMENT tional Resistance Lists tube types employed in 110 receiver Co., 401 N. Broad St., models Philadelphia 8. produced by 44 TV set manufactur- 3 -Speed Record 4 hanger: ers. Sylvania Electric Products, Inc., Em- Has one turntable and one tone arm, with COMMUNICATIONS EQUIPMENT porium, Pa. adjustments to play 33 1/3, 45, 78 and RPM Mobile Unit for 152 -162 Sub -Miniature Ballast Tube: records of all diameters and with large or Mc.: small spindle holes. Garrard Sales Corp., Single unit, designed for lower prices, has Up to 3 watts can be dissipated from a flat- 315 Broadway, New York. 10 -watt output. Draws 7.3 amperes standby, bulb tube 11/2 ins. long Maximum current and 23.9 amperes transmit on 6 -volt bat- is .9 ampere. A 100% increase in voltage Bridged -T Attenuators: tery. All miniature tubes. Case is 5 5/16 produces a current change of less than 5 %, while ambient Smaller in size but interchangeable with ins. high, 12 3/16 ins. wide, 141/8 ins. deep, temperature from -50° to weighing +70° C causes the current present standards. The 12 -step VU meter 271/2 lbs. Federal Telephone & to change less than 2 %. Amperite Co., 561 multiplier is 21/8 ins. in diameter, Radio Corp., Clifton, N. J. Inc., Broadway, while the New York 30 -step bridged -T mixer control 12. is 21/2 ins. FM Units for 72 to 76 Mc.: in diameter. These and 180 other types Beam Power Amplifier: are listed in a new bulletin on attenuators. A 50 -watt transmitter and companion re- Shalleross Mfg. Co., Collingdale, Pa. ceiver for point -to -point and relay service. Type 19BG6 -G, particularly designed for Receiver features permanent adjustment of horizontal deflection circuits in TV receivers, Magnetic Tape Splicer: the squelch. Designed for desk mounting or with picture tubes operated at less than 10,000 volts. DC plate, 500 volts, 100 milli- Produces strong, smooth, diagonal splice in relay rack. Philco Corp., Industrial Div., amperes; peak heater cathode voltage, 250 1/.1 -in. tape, without scraping, cementing, Phila. 34. or volts with heater positive or negative with use of adhesive. Joint is made by plastic Beam Antenna respect to cathode. General weld (luring an accurately -timed for 152 -162 Mc.: Electric Co., heating Tube Division, Schenectady, N. Y. cycle. Total time is 10 seconds. Thickness Corner reflector design for high -gain, nar- of tape is not increased. Prestoseal Mfg. row -angle transmission or reception. Can be MATERIALS Co., 38 -01 Queens Blvd., Long Island City, mounted on pipe mast or fabricated tower. N. Y. Requires no tuning. Gain is 8 db over Pipe & Conduit Markers: dipole. Vertical polarization. Andrew Corp., Designed to identify materials carried in pipes GENERAL COMPONENTS 363 E. 75th St., Chicago 19. and voltages of lines in conduit. Markings and colors conform with ASA Standard. A13. AN Connectors: TEST & MEASURING INSTRUMENTS Self- adhesive markers, 2% by 9 ins. long, Wall chart shows 203 insert layouts and include 150 stock designs for pipes additional DC Electronic Microanuneter: and 23 insert positions, together with for conduit, with NEMA voltages from 110 service voltages, and illustrations of all basic Input resistance is 50 ohms, with 1 micro- to 4,800. Samples sent on request. W. H. AN shell types. Charts are available with ampere full scale. Used as an amplifier, Brady Co., Dept. 98, 815 N. 3rd St., Mil- half-scale or full -size drawings. Cannon this instrument actuates a 1- milliampere, waukee 3.

6 FM AND TELEVISION LE1 NOT Dß CAPACITOR ARITIIMETIC IN

Remember the old story? Because Sprague, and only Sprague, "Look, Ruthie," said the substitute makes all four- ceramic, mica, paper teacher, "if you had 3 peaches and gave and electrolytic -Sprague can recom- 2 to Johnny, how many peaches would mend and supply the particular kind of you have left ?" fixed capacitor best suited for your spe- Ruthie pondered. cific application with due regard for the "I don't know, teacher," she finally performance, space and economic con- whispered. "When our regular teacher is siderations involved. here, we always do arithmetic in apples." In capacitor arithmetic, calculations When you want peaches, Sprague a la Ruthie may not add up in your best doesn't try to sell you apples, for we interest. have plenty of both on the shelf. SPRAGUE ELECTRIC COMPANY NORTH ADAMS, MASS. SPRAGUE

P I O N E E R S I N ELECTRIC AND ELECTRONIC DEVELOPMENT

July 1949 -formerly I .1/. and FM R mo- ELECTRONICS THIS MONTH'S COVER Wie Fire department officials have ion been notably reluctant to make use of mobile radio because they have been taught, over the years, to shun any apparatus which does not give a signal if it fails. Thus, they are having to overcome an ingrained 911. prejudice against a means of com- Bat munication that does not use wires. Gradually, though, fire chiefs are coming to use mobile radio in their own cars, and from this start they are adding installations to their fire RADIO apparatus. The dramatic photograph on this month's cover was taken by Charles Fowler at Pittsfield, Mass., just as the hook and ladder roared COMMUNICATIONS nut to the street from the fire house. always specify WHAT'S NEW THIS MONTH 1. NEW SYSTEM OF t 'i.i 1.1 3. NATIONAL MOBILE SYSTEM 2. POLICIES OF THE AD HOC COMMITTEE 4. SALES BY NARDA MEMBERS

1 For the first time, call letters as- KAAM through KZZ99, and WAA20 signed in accordance with the FCC's through WZZ99. Design Leader new plan appear in our Directory of The area assignments of letters are in Mobile Radio Systems. This plan, accordance with the following state in the Field adopted April 27, 1949, employs letter gròups. and numeral combinations, the former KAA -KBZ WAA -WBZ Since 1932 selected in accordance with area assign- Colo., Iowa, Kans., Minn., Mo., ments listed 'below, while the number of Nebr., N. D., S. D. with Equipment digits is related to the class of service. KCA -KDZ WCA -WDZ This will not affect broadcast station Conn., Me., Mass., N. H., R. I., Vt. calls, but all other transmitters, except KEA -KFZ WEA -WFZ coastal stations not in Alaska, will be N. Y., N. J. "PREFERRED changed over, while the new calls are be- KGA -KHZ WGA -WHZ ing assigned as new licenses are issued. Del., D. ' C., Md., Penn. No date has been set when all calls must KIA -KJZ WIA -WJZ HE WORLD OVER" be changed, but July 1, 1950, will prob- Ala., Ga., Fla., Ky., N. C., S. C., ably be the deadline. Tenn., Va. The plan for assignments to mobile KKA -KLZ WKA -WLZ radio services is as follows: Ark., La., Miss., N. M., Okla., Texas. KMA-KNZ FM BASE STATION: (The headquarters trans- WMA -WNZ mitter or transmitters of a mobile radio Calif. 25 -50 MC 72 -76 MC 152 -162 MC KOA -KPZ WOA -WPZ system) Station call comprises 3 letters Ariz., Idaho, 450 MC Band 960 MC Band and 3 digits, from KAA200 through Mont., Nev., Ore., KZZ999, or WAA200 through WZZ -999. Utah, Wash., Wyo. KQA -KRZ WQA -WRZ MOBILE TELEPHONE, ASSOCIATED WITH Mich., Ohio, W. Va. BASE STATION: Uses the same call letters KSA -KTZ WSA -WTZ AM as the base station. Ill., Ind., Wisc. 25-50 MC 1500-3000 KC MOBILE TELEPHONE, NOT ASSOCIATED KUA -KVZ WITH BASE STATION: (As in the case Pacific areas. of mobile units licensed to a town which KWA -KZZ FIXED STATION, MOBILE AND takes service from a base station licensed Alaska. PORTABLE EQUIPMENT to another town) Station call comprises WWA -WWZ 2 letters and 4 digits, from KA2000 Atlantic- Caribbean areas. through KZ9999. WWV INCLUDING V&I-7-s"----R I G Standard Frequency. MOTORCYCLE RADIO OPERATIONAL FIXED STATIONS: ' (Such as relays and repeaters) Station call corn - Engineering consultant Raymond EQUIPMENT prises 3 letters and 2 digits, from KAA20 LI Wilmotte has suggested that a per- through KZZ99, and WAA20 through manent board of engineers be set up to WZZ99. function along the lines of the Ad Hoc ZONE, INTERZONE TELEGRAPH: Station Television Committee, to assist the FCC Link Radio Corporation call comprises 3 letters and 2 digits, from (Continued on page 9) FM AND. TELEVISION 125 W. 17th St., New York 1 1, N. Y. WHAT'S NEW THIS MONTH NOW! Modern, Comprehensive TV "Staging" plus (Continued from page 8) Commissioners, without infringing on the NEW TV REVENUE from Pattern Time work of the Commission's Engineering Division. In support of this proposition, he has with the G RAY given the first information on the opera- tions of the Ad Hoc Committee: "Work- ing on the Ad Hoc Committee has been a real pleasure. It is seldom that one has TELO P an opportunity to be part of a group, This most versatile telecasting working on a project of national impor- optical projector enables dual pro- tance, that is searching for the engineer- jection with any desired optical ing truth and nothing but that truth. dissolve under exact control. This experience is of value, for it shows it can be done; that in the proper at- The accessory STAGE NUMBER 1 three functions separately or mosphere commercial alliances, can be adds simultaneously: a) teletype news forgotten, and all engineering factors strip, b) vertical roll strip and c) given full and careful consideration. revolving stage for small objects. "Throughout its work, the Committee has had practically no disagreements. The TELOP, used with TV film cam- There were of course, wide differences of eras, permits instant fading of one opinion on the method of attacking many object to another, change by lap of the engineering problems that came dissolve or by superimposing. up, but in each case of such differ- Widest latitude is given program ences the Committee resorted to mea- directors for maximum visual surements as the only true, impersonal, interest and increased TV station engineering .arbiter. What the measure- income.

ments said decided the issue. For lull details wale for Bulletin r101 "The atmosphere was in sharp con- trast to the picture that one would have GRAY RESEARCH expected from listening not to all but and Development Co., Inc. certainly to much of the engineering 16 Arbor St., Hartford 1, Conn. testimony at FCC hearings where too often an engineering opinion is given without the engineering data to back it; where those whose commercial needs re- quire large service areas find weak sig- nals satisfactory, and those of different MOBILE RADIO interests find strong signals essential; where figures of field intensity are ar-

gued at length to an accuracy of . one per cent because the printed curves can HANDBOOK be so read, without regard to the fact that the curves may be more than 100% in error when applied to a particular Edited by Milton B. Sleeper case; where engineering factors are de- liberately neglected because, even though Completely up -to -date, the MOBILE RADIO HANDBOOK true, they are not part of the ritual; or, invaluable source of practical, working information for: to sum up, where the truth, some of the Radio Supervisors, Communications Engineers, Servicemen truth, and something less than all the Officials responsible for mobile systems, Operators truth is presented. This large -size book, 8 %/ by 11% inches, covers all classes of "How was this ideal atmosphere of the mobile radio systems, from police and fire to taxicab and public Ad Hoc Committee produced? The Corn - utility installations. The top authorities, each an expert in his mittee decided from the beginning that own field, were selected to prepare the individual chapters. Of its job was not a policy job. Its job was special interest are the chapters on units which feature adjacent - evaluate engineering facts; that en- to channel operation and automatic modulation limiting, and mi- gineering facts are not matters of policy crowave relay apparatus. Except for the section on theory, no or of personal egos; and that it would mathematics are employed. The text is profusely illustrated with not consider or discuss the effect of vari- large, detailed photographs and drawings printed on fine paper. ous factors on the ultimate policy deci- sion of the mileage separation between ORDER YOUR COPY NOW! stations before fully evaluating the facts CLOTH BOUND 84.00, PAPER BOUND $2.00 of propagation, because personal and pre- conceived ideas as to mileage separation might super -impose an undesirable trend Published by FM-TV Magazine to the evaluation of the data available. Savings Bank Building, Great Barrington, Mass. (Continued on page 10) July /949- formerly FM, and FM RADIO -ELECTRONICS WHAT'S NEW THIS Professional Directory MONTH (Continued from page 9) Professional Directory Similar efforts were made throughout the Committee's work to endeavor to elimin- ate personal and psychological factors McNARY & WRATHALL ottn4 &i/ej from invading and influencing decisions CONSULTING RADIO ENGINEERS AN ORGANIZATION OF which should be utterly and completely Qualified Radio Engineers objective. v DEDICATED TO THE "Throughout its work, consideration 906 National Press Bldg. DI. 1205 SERVICE OF BROADCASTING was also given to the accuracy to which Washington, D. C. the Committee's evaluation of the facts 1407 Pacific Ave. Phone 5040 Bldg., D. C. available could be depended National Press Washington, upon to Santa Cruz, California represent average conditions needed in allocation. It was hoped that this in- formation would help the policy makers apply the information presented with a GARO W. RAY proper appreciation of the inherent en- KEAR & KENNEDY gineering uncertainties for, without such Consulting Radio Engineers CONSULTING RADIO ENGINEERS an appreciation, allocations can fall seri- Standard, FM and Television Services ously out of line. "The subordination of commercial 1703 K St., N.W. STerling 7932 HILLTOP DRIVE psychologies and egos, the search for esti- Washington, D. C. STRATFORD, CONN. Tel. 7 -2465 mates of accuracy, and the raising of measurements to the status of arbiter were probably the principal tangible fac- tors that created the harmony within ANDREW ALFORD the Committee." GEORGE P. ADAIR This information on the manner in Consulting Engineers which Ad Hoc deliberations were carried Consulting Engineers out is reassuring. However, their conclu- ANTENNAS & RF CIRCUITS sions may be completely right on the Radio, Communications, Electronics basis of engineering facts, and yet they Laboratory and Plant: 1833 M St., N.W., Washington 6, D.C. 299 Atlantic Ave., Boston 10, Mass. may prove to be impossible of practical, EXecutive 1230 Phone: HAncock 6 -2339 commercial applications. Still, a knowledge of engineering facts and the extent of variable factors should be of great protection to the Commis- DALE POLLACK sioners when they are subjected to the 'RANK II. FREQUENCY MODULATION persuasions of policy -level witnesses who shift the variables to such upper or lower SH]/ßßcINTO development and research limits as support the positions they see transmitters, receivers fit to take. At best, the lot of the Chair- communications systems man and the Commissioners is not an Consulting Radio Engineers easy one. D. 352 Pequot Avenue New London, Conn. 710 14th St. N.W., Wash. 5, C. New London, 2 -4824 MEtropolitan 4477 3The operation of limited common . carrier mobile systems has been given a tremendous impetus by provi- sions of the new FCC rules which quite WELDON & CARR GEORGE C. DAVIS properly have the effect of limiting the RADIO ENGINEERS number of private systems operated in CONSULTING Consulting Radio Engineers urban areas. As explained by Jeremiah Washington, D. C. Courtney on his page this month, city 1605 Connecticut Ave. MI. 4151 501 -514 Munsey Bldg.- Sterling 0111 service and distribution companies can no longer operate their own systems, but Dallas, Texas Washington 4, D. C. must use the facilities of the Telephone 1728 Wood St. Riverside 3611 Company (common carrier) or the inde- pendent operators. Now that FCC rules have cleared the AMY, ACEVES & KING, INC. track for LCC expansion, the independ- COMMUNICATIONS RESEARCH Specialists in the ent operatotrs have announced the forma- CORPORATION Design and Installation of tion of the National Mobile Radio System Planning- Engineering System. With nearly 100 independent HIGH -GAIN Research & Development operators in principal cities from coast AM, FM, and TELEVISION FM- TV- Facsimile cooperative arrangements are ANTENNA SYSTEMS to coast, VHF -Communications being worked . out by the association LOngacre 5 -6622 members to handle calls from cars or 60 E. 42nd St., New York 17, N. Y. York 18, N. Y. Mu 2 -7259 11 West 42nd St., New (Concluded on page 11)

FM AND. TELEVISION WHAT'S NEW THIS MONTH Special Services Directory Professional Directory (Continued from page 10) trucks when they are outside their home areas. This follows the original plan of RAYMOND M. WILMOTTE Inc. linking independent telephone companies, METHODS ENGINEERS in the early days of 'telephone service. Paul A. deMars A technical coordinating committee, Materials & Methods engineers in America's Associate leading manufacturing plants use Topflight's headed by Peter T. Kroeger of Mobile Printed Cellophane, Self - Adhesive Tapeto meet A -N specs. - assembly line - follow Engineers Radio Dispatch , Service, New Bruns- Consulting through - instruction labels. Easy to Apply. Radio & Electronics wick, N. J., has been set up to integrate TOPFLIGHT TAPE CO. YORK PA. 1469 Church St., N. W. Decatur 1234 the communications facilities of member Washington 5, D. C. stations, to work out uniform practices and standards, and to develop high- speed techniques for handling radio - landline message traffic. William S. RANGERTONE RUSSELL P. MAY Halstead of Communications Research Corporation is engineering consultant. TAPE RECORDERS CONSULTING RADIO ENGINEERS Jeremiah Courtney is legal counsel for HIGH -FIDELITY EQUIPMENT FOR * * * the new association. BROADCAST & RECORDING STUDIOS

1422 F Street, N. W. Wash. 4, D.C. Officers of NMRS are: president, RANGERTONE, INC. W. - Kellogg Building Republic 3984 Norman Medlar, Westchester Mobile 73 Winthrop St. Newark 4, N. J. fone System, Inc., White Plains, N. Y.; Tel. Humbolt 5 -2550 Member AFCCE vice president, Terence McCarthy, Tele- phone ..Exchange, New York City; treas- urer, J. F. Donovan, Autofonë; Inc., Springfield, Mass.; secretary, George di THE WORKSHOP LYNNE C. SMEBY Matteo, Secretarial Exchange, Inc., ASSOCIATES Newton, Mass. C,onsufing INCORPORATED Specialists in /`acho// engineer3 There's so much tall talk going 4 , around about radio's high place in High- Frequency Antennas American industry that one might expect 820 13th St., N.W. EX 8073 66 Needham St., Newton Highlands, Mass. the volume of sales to rank high in com- WASHINGTON 5, D. C. Bigelow 3330 parison to other home appliances. Sad to relate, that doesn't seem to be the case, according to figures released by Collins Custom Components the National Appliance and Radio Deal- Winfield Scott McCachren // ers Association. _lhe }inedt AND ASSOCIATES 'Very Data on percentage of total sales for FM TUNERS FM /AM TUNERS Consulting Radio Engineers 1946, '47, and '48 show radio sets con- FM RECEIVERS sistently below Custom Matched Components TELEVISION SPECIALISTS refrigerators, washing machines, and ranges. Not only that, Co n 9 2404 Columbia Pike 410 Bond Bldg. but audio broadcast receivers dropped Arlington, Va. Washington, D.C. 54% in that period while refrigerator Audio Products Co., Inc. P. O. Box 368 . Westfield, N.J. GLebe 9096 District 6923 sales increased 50 %. As for television, which NARDA listed for the first time in 1948, dollar volume in receivers was RADIO -MUSIC CORP. RATES FOR less than for the combined sales of freez- ers and ironers. REPRODUCERS TURNTABLES PROFESSIONAL CARDS II Here is the percentage breakdown of IN THIS DIRECTORY dollar volume by NARDA members: AMPLIFIERS C SPEAKERS 1948 1947 1946 F. M. broadcast quality for custom $12 Per Month for This Standard Refrigerators 28.6% 24.0% 19.0% sound installations for the studio and Orders Are Accepted Space. Washing the home. for 12 Insertions Only. Machines 16.9 18.0 16.0 PORT CHESTER, NEW YORK Ranges 12.2 13.0 12.0 Radios 7.8 17.0 17.0 TV Sets 4.4 NATHAN Freezers 2.5 KAY ELECTRIC CO. Ironers 2.0 trv co rhtt; WILLIAMS Vac. Cleaners 1.4 3.0 3.0 Manufactufer§' FM TV AM Other Televiston <,t uipment Consulting Engineer Appliances 24.2 25.0 33.0 Laborsto t sf; ments To be sure, this report is from only Eleictr É 'ei D ices 20 Algoma Blvd. one dealer group, but the figures are EtS 14 Maple - , *- rook. N. J. Oshkosh, Wis. of of Phone: Brkhatuk 22 reasonably typical other types Tel. CAldwell 6-3710 stores handling home radio equipment.

J il l y 1949-formerly FM, and FM RADIO-ELECTRONICS in quality...

in cost 23C SPEECH INPUT EQUIPMENT for AM and FM Stations

ERE is a complete, compact, high -quality Amplifier and Control Assembly - available at minimum cost! The Western Electric 23C Speech Input Equipment serves either one or two studio layouts, in either AM or FM stations -can be used as part of a larger system, with outputs switched in a master control room. The 23C incorporates four microphone input circuits with pre- mixing amplifiers and one input circuit for incoming program lines -all combined in a 5- channel mixer. Three -stage amplifier boosts signals to level needed for outgoing program lines or output switching systems. Also includes independent monitoring amplifier. The 23C will handle 8 studio microphones or low- output -level tran- scription turntables; 4 remote lines or other medium -level inputs; control room announce and talkback mike. Controls are conveniently arranged, easily operated. Get the full facts on the 23C from your local Graybar Broadcast Rep - resentative-or write Graybar Electric Company, 420 Lexington Avenue, New York 17, N. Y. DISTRIBUTORS: IN THE U. S. A.- Graybar Electric Company. IN CANADA AND NEW- FOUNDLAND- Northern Electric Co., Ltd. QUALITY COUNTS- Western Electric 12 FM AND TELEVISION MOBILE RADIO FAST BECOMING THE MOST IMPORTANT APPLICATION OF FM, IT IS ALSO THE GENESIS OF THE LONG -DISTANCE FM PHONE AND TELEVISION RELAY SYSTEMS

3y MILTON B. SLEEPER

Twenty years ago, use of the long -distance tele- petitor to audio and video broadcasting, both as to phone was looked upon in business and private volume of sales and personnel employed. life as an emergency service, and even then invoked Our Directory of Mobile Radio Systems is not only after inquiry as to rates and probable time re- only an important service to communications engi- quired to complete the connection. Today, crowd- neers, operators, and supervisors. It is also a picture ing each waking hour to make it produce more profit of the present dimensions of this field. or accomplishment, we have become a nation of long - Within the next year, the number of systems may distance talkers, indifferent to the cost, expecting well increase by 50%, and the number of mobile units the calls to be completed as quickly as those to our by an even larger amount. To bring our July, 1948 next -door neighbors. Directory up to date for publication in this issue, were required. We also Up to now, we have considered mobile radio as an 1170 additions and changes to which emergency service, limited to the use of police and recorded over 1,250 pending applications, These others concerned with the protection of life and prop- we are currently adding nearly 100 each week. after the licen- erty. But in the next ten years, we shall come to use will appear in subsequent Directories, mobile radio without thought of distinction between ses have been granted. wire -line and wire -less service. The July Directory covers only one -half of the total systems. The other classifications, including taxis point in the use of mobile radio was, The turning and public utilities, are listed each January. of course, the release of new rules and frequency allo- FM -TV devote so much space to mobile cations by the FCC, on May 6, 1949. These alloca- Why does is because mobile radio is FM. Audio tions provide 616 channels for mobile services between radio? It was a highly developed service before 25 and 460 mc., plus bands totalling 7,940 mc., in broadcasting ever invented, but mobile radio actually width between 1,850 and 30,000 mc. for non- govern- FM was with the demonstrated success of the state- ment fixed, mobile and operational fixed transmitters. started wide FM system put into operation by the Connecti- When equipment is developed for the upper fre- cut State Police in 1940. Since that time, FM has quencies, these bands will permit unlimited extension come into exclusive use for all new installations, and of telephone service to all the people of our Country, the relatively few AM systems have been almost en- wherever they may live, work, or travel. It is no ex- tirely replaced with FM. the expansion of mobile radio aggeration to say that Meanwhile, a by- product of that FM development will be comparable to that of from this time forward is growing into a major contribution to other com- the invention of the the wire telephone following munications services. First, FM repeaters were used vacuum tube. to extend the range of mobile radio installations. the wartime use of multiplexed FM To mark this turning point, this entire issue of Then followed And now, with the Telephone Company's FM-TV has been devoted to subjects concerned with relays. FM relay between New York and Boston exceeding mobile radio. If we have disappointed readers whose capabilities of coaxial cable, it is safe to predict special interests are concerned with other subjects, the when television is networked coast -to- coast, the may we say that everyone engaged in manufacturing, that, be carried by elaborated versions of equip- operation, sales, and service should follow mobile signals will that had its beginning in the mobile radio service! radio developments closely, for it will be a close com- ment

13 July 1949- formerly FM, and FM RADIO -ELECTRONICS Fig. 2. L'Iris panel carries all the eonrponellt.x of the transmitter and receiver. Connectors are for the antenna and hand.set PORTABLE FM EQUIPMENT HAND -CARRIED UNITS, WEIGHING UNDER lo POUNDS, OPERATE ON 25 TO 50 OR 152 TO 165 MC. OVER DISTANCE UPWARD OF 2 MILES -%3y HOWARD V. CARLSON* EVER since the wartime development crates on any fixed frequency between of highly efficient, hand- carried radio 25 and 50 mc., while the PJZ -11 is telephone equipment, there has been a for the band from 152 to 165 mc. Either growing demand for similar units by the model can be used to communicate with various communications services. Un- fixed or mobile stations of any make de- fortunately, military designs are so high- signed for FM on the same channels. ly specialized that they do not meet. Fig. 1 shows the PJZ -1A, identified by civilian requirements adequately. the collapsible antenna. The PJZ -11 has The light- weight FM transmitter -re- a fixed antenna rod, similar to those ceiver illustrated here is specifically a used for mobile installations on the up- peace -time development. It provides per band. solid telephone communications up to ? Either storage .cells or dry batteries miles and more on level ground, under can be used to furnish power. In the severe noise conditions such as are en- former case, two 2 -volt non -spillable cells countered in railroad yards. When one are operated in parallel to drive a vibra- unit is used on the ground and another tor B supply. They will give 10 hours in an airplane at 2,500 ft., satisfactory of continuous reception, or approximately operation has been obtained at 60 miles. 8 hours with the normal amount of trans- There are two models to cover the mitting. The batteries can be recharged frequencies assigned to the emergency from 6 volts DC, or from a 110 -volt and industrial services. The PJZ -1A op- charger. It is not necessary to remove the batteries while charging, as they are *Doolittle Radio, Inc., 7421 S. Loomis Blvd., Chicago 36, III. Fig. 1. Ten -pound, self- powered portable vented to the outside of the case, and

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transmits, Y Fig. 5. Recd ver circuit for 1. to 165 mc. Fig. 6. The corresponding o an external connection is provided for such a unit would be rather simple, but L J O plugging in the charger. the conditions of operation and use for Fig. 3 shows the mechanical arrange- hand -carried equipment create mechan- ment of the battery and vibrator. ical and electrical problems that are far When dry cells are used, the weight more difficult to resolve than those en- is the same as for storage batteries. countered in the design of mobile types, Q Nine 11/2 -volt batteries and six of the for example, where limitations of size 45 -volt type are required. The cost fig- and weight are less severe. ures about 25 cents per hour. Fig. 4 Overall dimensions of the case are only shows the arrangement of the A cells and 8 ins. high, 8 ins. wide, and 31/2 ins. the terminal board. Four B batteries thick. The relative size can be judged that fit on top have been removed. by comparison with the standard hand- It might appear that the design of set, in Fig. 1. This degree of compact- July 1949-f ormeily FM, and FM RADIO-ELECTRONICS 15 ness has been made possible by the use employ a double- conversion superhetero- antenna, so other types can be substitu- of sub -miniature tubes throughout in the dyne circuit. The receiver diagram in ted for special purposes. A simple way to version for 152 to 165 mc., and only one Fig. 5 is for the 152- 165 to -mc. design. increase the range of the standard an- miniature tube in the 25- to 50 -mc. Sensitivity is 1 microvolt for 20 -db quiet- tenna is to connect a 6 -ft. length of wire model. The former has 21 sub -miniature ing, with spurious responses down to to the case, and let it hang down. tubes of only 4 types, while the latter has 60 -db. Selectivity is 60 db at 60 kc. re- Several items of auxiliary equipment 19 tubes of 3 types. Life expectancy of moved from the operating frequency, are available for use with this unit. The these tubes is rated at 5,000 hours, ex- and 85 db 120 at kc. The output of 10 metal case has been designed to cept for the IAD4. It has just come into milliwatts give is sufficient to drive a small ample protection against all outdoor commercial use, but its life should be speaker or a conventional handset. weather conditions. However, a fabric about the same as the others. Following The transmitter meets all the require- carrying case and shoulder strap or back is the list of types and their functiòns: ments of the new FCC rules for power pack harness can be supplied. Hand or 25 to 50 Die. RECEIVER 152 TO 165 MC. under 3 watts. Stability is well within throat microphone can be used with a 2E32 Ose. Mult. 2E32 Ose. Mult. the permissible tolerance of .01 %, and separate push -to -talk switch and an ear- 5678 1st RF IAD4 Quad. the modulation capability is plus and piece receiver. 5678 2nd RF 1AD4 1st RF minus 15 kc. FCC regulations permit the use of 2E32 1st Mixer 1AD4 2nd BF All components of the transmitter and these portable units on frequencies al-

Fig. 3. The hinged case gives access to the two storage batteries and vibrator power supply. Fig. 4. Alternate dry -cell power 2E32 1st IF 5678 1st Mixer receiver circuits are mounted on a ver- located to mobile transmitters. In addi- 2E32 2nd Mixer 2E32 1st IF tical panel directly beneath the top of tion, special frequencies have been 2E32 2nd IF 2E32 2nd IF the case. This arrangement can be seen assigned for transmitters of not more 2E32 1st Limiter 5678 2nd Mixer in Fig. 2. When service is necessary, than 3 watts input to the final RF stage, 2E32 2nd Limiter 2E32 3rd IF the complete assembly can be removed for low -power industrial radio service. 2E32 1st Audio 2E32 1st Limiter from the case. It should be noted that The exclusive channels are 27.51, 33.14, 2E32 Output 2E32 2nd Limiter anyone acquainted with FM circuits can 35.02, and 42.98 mc., with 154.57 avail- 2E32 Output make the simple adjustments on the able on a shared basis. TRANSMITTER radio circuits. Factory service should Authorization may be granted to any 5672 or 2E32 Ose. 5672 Ose. not be necessary at any time. person engaged in a commercial activity, 2E32 Mod. 5672 Mod. To that end, all tuned circuits are com- or - an industrial enterprise. Emission 2E32 Mod. 5672 Mod. pensated for operation at ambient tem- must be confined to voice radiotelephony, 2E32 Quad. 5678 Quad, fperatures from -25° to +125°F. to assure and must not be used to communicate 2E32 Doubler 5678 Tripler requency stability. The condensers are with stations operating on other frequen- 2E32 Doubler 5678 Doubler either ceramics or oil -filled types, oper- cies. It is further specified that the an- 2E32 or 5678 Doubler IAD4 Doubler ated at a small percentage of their tenna must not be more than 3 ft. from 3V4 Final IAD4 Final rated capacity. Even the vibrator, rated the transmitter, the antenna power gain IAD4 Final at 6 watts, operates at only 2 watts. must not be greater than unity, and the As the tube lists indicate, the receivers An Amphenol fitting is used for the use of remote control is prohibited.

16 FM AND TELEVISION OPERATOR LICENSE REQUIREMENTS OFFICIAL EXPLANATION OF THE FCC LICENSE REQUIREMENTS FOR OPERATORS RESPONSIBLE FOR OPERATION AND MAINTENANCE OF MOBILE RADIO SYSTEMS

FOREWORD apparatus in such station except under rendition of service by individuals, au- and in accordance with an operator's thorized to do so by the station licensee, HE number of mobile radio systems license issued to him by the Commission; who hold no radio operator license of T is growing much faster than the however, the Commission is authorized, any class, but that the same conditions number of men qualified to operate under certain conditions, to waive the apply to such operation as would apply and maintain them. This has become a above requirement to the extent that if the stations were operated by holders serious problem to the radio manufac- public interest, convenience, or necessity of Restricted Radiotelephone or Radio- turers, since each new installation sold would be served thereby. telegraph Permits. It follows, therefore, calls for the services of a licensed opera- The duties of a radio operator, with that regardless of whether a given tor. respect to any licensed station, include station may be operated during the Also, because the FCC permits un- not only the handling of communications, course of normal rendition of service by licensed operators to use mobile radio the manipulation of on -off controls, and an unlicensed individual or whether the equipment, there has been a tendency to the keeping of station logs (if required) holder of at least a Restricted Permit is discount the need of engaging a licensed but also, in a larger sense, the perform- required to perform those functions, in operator to assume full responsibility for ance of any technical duties with respect either case any tests or adjustments co- the adjustment and maintenance of the to that station which may affect the incident with the installation, service, equipment. proper operation of the station and its repair, or maintenance of the transmit- Because, to those not familiar with the compliance with the terms of its license ting apparatus must be performed by or complexities of FCC regulations, the and with the Commission's Rules and under the immediate supervision and re- book of Rules is highly confusing, we Regulations. By reference to Sections sponsibility of the holder of a valid first - radio- asked George Rollins at FCC headquar- 13.61 and 13.62 of the Commission's or second -class radiotelephone or ters for a simple statement on operator Rules Governing Commercial Radio telegraph operator license. license requirements. In reply, we re- Operators,' it will be seen that, with re- In the case of a station licensee who a full - ceived the following official information spect to fixed, land, base, and mobile does not have in his employ on over the signature of T. J. Slowie, Sec- radiotelephone stations in the land time, regular basis an operator holding a retary of the FCC: mobile services, only the holders of radio- license valid for the unlimited perform- of all operating duties at that FEDERAL COMMUNICATIONS COMMISSION telephone or radiotelegraph first- or ance an operator must be avail- WASHINGTON 25, D. C. second -class operator licenses are author- station, such which only May 24, 1949 ized to perform all the above functions. able to perform those duties to perform, or the Editor, FM -TV Magazine As a condition to the authorization of he is authorized until such an Great Barrington, Mass. holders of Restricted Radiotelephone or station must be shut down obtained, whenever con- Dear Sir: Radiotelegraph Permits to perform a operator can be any adjustments, repairs, This is in reply to your letter of April portion of those duties, Section 13.6] ditions require which might affect the 25, 1949, addressed to Mr. George K. specifies that: or maintenance proper operation of the station. It may Rollins in the Bureau of Engineering of 1. Such operator is prohibited from that the independent this Commission, in which you request making any adjustments that may result be emphasized may be on call or under certain information for publication in in improper transmitter operation; and serviceman who to perform installation, repair, FM -TV Magazine regarding the operator 2. The equipment must be so designed contract maintenance duties may not requirements for the normal operation that none of the operations necessary to service, or adjustments or tests that might and servicing of mobile radio communi- be performed during the course of normal perform affect the proper operation of the station cation equipment. rendition of service may cause off -fre- unless he holds at least a second -class As an introductory remark, it may be quency operation or result in any un- radiotelephone or radiotelegraph operator pointed out that any station normally authorized radiation; and license, or unless he performs those duties transmitting telegraphy by any type of 3. Any needed adjustments of the under the immediate supervision and re- the Morse Code must be operated, dur- transmitter that may affect the proper sponsibility of an operator holding such ing such transmissions, by the holder of operation of the station must be regu- license. The mere fact that an operator an appropriate grade of radiotelegraph larly made by or in the presence of an holding this grade of license is employed operator license or permit. It is pre- operator holding a first- or second -class by the station licensee is not sufficient; however, that your inquiry re- license, either radiotelephone or radio- sumed, at least one such operator must be re- stations in the land mobile serv- telegraph, who shall be responsible for lates to for any transmitter adjust- normally transmit telephony, the proper operation of the equipment. sponsible ices which ments and tests during or coincident balance of this discussion will Commi §sion Order No. 133 and the and the with the installation, servicing, and only to such stations. various Parts of the Commission's Rules have reference maintenance of any radio station which provisions of Section 318 of and Regulations which govern the land Under the may affect the proper operation of that Act of 1934, as mobile services provide that' certain the Communications station, and such properly -licensed actual. operation of all classifications of stations in these serv- amended, the operator must either perform those apparatus in any radio sta- ices, particularly mobile stations operat- transmitting duties or they must be performed under which a station license is re- ing on frequencies above 30 mc., may be tion for his immediate supervision and responsi- by that Act shall be carried on operated during the course of normal quired bility. It is the sense of this requirement holding an operator's only by a person that the responsible licensed operator license issued in accordance with the Act, 'Obtainable from the U. S. Government Printing Office, Washington 25, D. C. The price is 5c. Do (Concluded on page 45) and no person shall operate any such not send stamps. 17 July 1949 -formerly FM, and FM RADIO-ELECTRONICS What the Neu' FCC Allocations and Rules Mean to the RADIO COMMUNICATIONS SERVICES A QUICK- REFERENCE;GUIDE TO THE FREQUENCY ASSIGNMENTS AND TECHNICAL THE REQUIREMENTS FOR VARIOUS CLASSES OF MOBILE RADIO SERVICE -Part 2

PUBLIC SAFETY RADIO SERVICE POLICE RADIO FREQUENCIES (Docket 9001, Part 10) FREQ. CLASS NOTES FREQ. CLASS N() I.-, FREQ. CLASS NOTES POLICE RADIO SERVICE 1610 Kc. Base,Mob. 6, 7,12 39.26 Mobile -15.18 " of stations in the police radio 1618 89.30 Mobile 45.29 Types » » base and mobile, mobile 1626 39.34 " 45.26 Mobile service include » » relay, control, repeater, and zone and 1 634 39.38 " 45.30 addition, subject 161,2 39.42 Base, Mob. 45.34 interzone stations. In » to certain limitations, installations may 1650 7, 12 39.46 45.38 be made in vehicles, which, in an emer- 1658 89.50 4.5.42 Base, Mob. gency, would require the co- operation of 16i(í6 :39.54 " 45.46 " ,, the police, such as fire department ve- 1 (ií 4 " " X9.58 45.50 hides, ambulance, emergency units of 1682 39.62 " 45.54 " public utilities, life -guard emergency 1690 6, 7, 12 39.[íG Mobile 45.58 and rural school buses. 1698 39.70 " 45.62 units, » » 1703 89.74 " 45.66 " Frequency Assignments: 1714 7, 12 39.78 " 45.70 Available frequencies are listed in the 1722 39.82 Base, Mob. 45.74 Mobile accompanying table, subject to qualifica- 1730 39.86 " 45.78 tions set forth in the footnotes. 2326 6, 7, 12 39.90 " 45.82 '.366 Technical Information: 89'94 " 45.86 2382 7, 12 39.98 " 45.90 Base, Mob. 5 f EMISSION LIMITATIONS: Bandwidth for 2390 6, 7,.12 12.02 7, 8 45.94 AM telegraph is .1 kc.; for AM phone, 2406 7, 12 12.06 " 45.98 8 kc.; for FM phone 40 kc. The specified 7414 " " 42.10 " 46.02 band shall contain those frequencies 219.á 59 4214 " 72.02 to upon which a total of 99% of the radi- 2130 4.2.18 Mobile If 74.58 Op.` ?ixed ated power appears, extended to include 2442 " 4)) " 7.5.42 to » » any discrete frequency upon which the 2 -1,50 42.26 " 75.98 » power is at least .25% of the total radi- 2458 » 42.30 " 154.65 Mobile » ated power. Radiation in excess of these 2466 " 42.34 Base, Mob. 154.71 97 limits is considered unauthorized emis- 2474 " » 42.38 » " 154.77 sion. Any emission appearing on any 2482 » " 4á.42 » 154.83 " frequency removed from the carrier fre- 2490 » » 42.46 " 154.89 Mobile quency by at least 50 %, but not more 2804 Zone, Int'zone 9, 12, 42.50 " " 154.95 than 100% of the maximum authorized 2808 4.2.54 155.01 Base, Mob. bandwidth shall be attenuated not less 08l2 " " 40.58 » " 155.07 " » » than 25 db below the unmodulated car- 5135 42.62 " 1.55.13 » rier. Spurious or harmonic emission ap- 5140 » 42.66 Mobile 1.55.19 pearing on any frequency removed from 5195 75 9, 10, 12 42.70 " 153.n " the carrier frequency by at least 100% 7480 9, 11, 12 4-2.74 155.31 " of the maximum authorized bandwidth 7 805 42.78 155.37 " shall be attenuated below the unmodu- /93J » » 42.82 Base, Mob. 99 155.43 lated carrier by not less than: 37.02 Mc. Mobile 42.86 " " 1.55.49 40 db with maximum plate power input 37.06 Base, Mob. 1 2.90 " " 155.55 to the final RF stage of 3 watts or less 37.10 42.94 " 7, 8 155.61 60 db with more than 3 watts and in- 37.14 " 14.62 " " 155.67 " eluding 150 watts 37.18 » -14.66 " 155.73 " '70 db with more than 150 watts and in- 37,22 » 44.70 " " 155.79 eluding 600 watts 37.26 44.74 " 155.85 Mobile 80 db with more than 600 watts. 37.30 44.78 Mobile " 155.91 If MODULATION: AM or FM phone or tone- 37.34 Mobile 44.82 " " 15.5.97 signal modulation is authorized, with a 37.38 44.86 " " 156.03 maximum modulation of 3,000 cycles. 37.42 » 41.90 " 7, 8 156.09 On FM, deviation due to modulation 39.02 Base, Mob. -14.94 Base, Mob. " 156.15 » must not exceed plus or minus 15 ks. 39.06 44.98 " " 156.21 Base, :\IOl). from the unmodulated carrier. 39.10 » 15.02 " ' 156.27 Each transmitter authorized or in- 39.14 " 15.06 " " 156.33 » stalled after July 1, 1950, must be pro- 39.18 45.10 " 156.39 vided with a device which will automati- 39.22 45.14 " 156.45

18 Fill AND TFr.FVISION 156.51 159.51 to 3500 to ated under load conditions. The use of 156.57 161.79 4 3700 Base, Mob. automatic frequency monitors is ap- 156.63 454.05 to 6425 to proved for frequency checking. If If 156.69 455.95 1 6575 Any independent, qualified engineering 156.75 952 to -6575 to measurement service may be employed, If ff 158.73 960 Op. Fixed 6875 Op. Fixed provided the log entries show the name 158.79 1850 to 11700 to and address of the firm, and the name If 158.85 1990 12200 Base, Mob. If of the person making the measurements. 158.91 Mobile 2110 to 12200 to OPERATOR'S LICENSE: While unlicensed 158.97 2200 ff ff 12700 Op. Fixed persons may operate the transmitters, all 159.03 2450 to 16600 to adjustments or tests for installation, 159.09 Base, Mob. 2.500 Base, ff Mob. 18000 service, or maintenance "which may 159.15 Op. Fixed 1, 2 26000 to affect the proper operation of such a 159.21 2500 to 30000 fl ff station, shall be made under the immedi- 2700 Op. Fixed 1 ate supervision and responsibility of a tally prevent modulation in excess of watts at 25 to 100 mc.; and 600 watts at person holding 1st or 2nd class commer- that specified above, except that this 100 to 220 mc. Power at frequencies cial radio . operator license, either radio- shall not apply to mobile transmitters above 220 mc. will be specified in the telephone or radiotelegraph, who shall be using a maximum plate power input to FCC authorization. Stations presently responsible for the proper functioning of the final RF stage of 3 watts or less. authorized to use power in excess of the the station equipment." FREQUENCY STABILITY: Frequency toler- limits specified above may continue their In the case of radiotelegraph stations, ance of be the carrier frequency must operation until the expiration of their however, ,. adjustments affecting the fre- maintained at .01% below 50 mc., and current license term. Power and antenna quency must be made by a person hold- .005% from 50 to 220 mc. Stability height shall be no more than the mini- ing a 1st or 2nd class commercial radio- above 220 mc, will be specified in the mum required for satisfactory technical telegraph operator license. FCC authorization. operation commensurate with the area to No person is required to be in attend- For transmitters with a maximum be served and local : conditions which ance at a transmitter when operating in plate power input to the final RF stage affect transmission and reception. the course of normal service, or at trans- of 3 watts or less, the frequency toler- TRANSMITTER MEASUREMENTS: Fre- mitters used for telemetering or for self - ance required is .02% below 50 mc., and quency and modulation measurements actuated retransmission. .01% from 50 to 220 mc. Stability above on each fixed and mobile unit must: be CHECKING LIGHTS: The licensee shall 220 mc. will be specified in the FCC made and entered in the log every 6 make a check of authorization. months, or whenever an adjustment is daily the tower lights "either by visual observation of MAXIMUM PowER: Maximum plate made that might affect frequency or the power input to the final RF stage shall modulation. Mobile units may be tower lights or by observation of an automatic indicator to insure that all not exceed 2 kw. at 1.6 to 3 mc.; 500 checked on the bench if they are oper- such lights are functioning properly." harmful interference will be caused to the mari- i Limited to developmental operation only with time mobile service. Any observed failure of a code or rotat- the assigned frequency and particulars of opera- o The use of this frequency is subject to the tion specified in each authorization. condition that no harmful interference will be ing beacon light not corrected within 30 2 Subject to no protection from interference due caused to the service of any Canadian station. minutes must be reported immediately by to the operation of industrial, scientific, and medi- 7 This frequency is available for assignment only cal devices in this band. in accordance with a geographical assignment plan. telegraph or telephone to the nearest Air- 3 Assignable frequencies spaced by 40 kc. be- 8 This frequency is reserved primarily for as- ginning with the frequencies 72.02 and 75.42 mc. signment to state police licensees. Assignment to ways Communication Station or CAA and ending with the frequencies 74.58 and 75.98 other police licensees will be made only where the office regardless of the cause of the fail- mc. respectively, are available on a shared basis to frequency is required for coordinated operation operational fixed stations in the police radio ser- with the state police system to which the frequency ure, and notice given immediately on re- vice on the condition that no harmful interference is assigned. Any request for such assignment must will be caused to the reception of television sta- be supported by a statement from the state police sumption of illumination. Lights and tions on Channels 4 or 5. system concerned, indicating that the assignment light controls must be inspected at least 4 Assignable frequencies spaced by 60 kc. be- is necessary for coordination of police activities. ginning with the frequency 159.51 mc. and ending o This frequency is available for assignment to once every three months. with the frequency 161.79 mc. are available on a zone and interzone stations in the police radio shared basis to base and mobile stations in the service for use with type Al emission only and a In addition, at intervals not to exceed police radio service upon an adequate showing of maximum plate input power of 1,000 watts to the three months, the voltage must be mea- need and upon the condition that no harmful in- final radio frequency stage of the transmitter. terference will be caused to the service of any io This frequency is authorized for use as a sured at each socket under load. If that existing or future station operating in the rail- calling frequency; however, the transmission of road radio service. operating signals or a single short radio telegram is not practicable, the voltage may be 5 The use of this frequency may be authorized is permissible provided no harmful interference computed from measurements under load to base and mobile stations in the police radio ser- will be caused to any calling signals. vice on the condition that no harmful interference n This frequency may be used only during that at some other point in the circuit. will be caused to the maritime mobile service. period of time between 2 hours after local sunrise records, which must be Police operations at points within 150 miles of and 2 hours before local sunset. Station signed, coastal areas and navigable gulfs, bays, rivers and 12 This frequency may be subject to change when dated, and retained for one year, are lakes may be authorized only after a factual find- the Atlantic City table of frequency allocations ing indicates that, on an engineering basis, no below 27.50 mc. comes into force. specified in detail in the Rules. FIRE RADIO SERVICE FIRE RADIO FREQUENCIES Fire department base stations are au- thorized to intercommunicate with FREQ. CLASS NOTES FREQ. CLASS NOTES FREQ. CLASS NOTES mobile units on fire apparatus, with 1630 kc. Base, Mob. 7 33.74 46.14 other stations in the public safety serv- 33.42 mc. Mob., Fixed 6 33.78 46.18 ices, and with receivers at fixed locations. 33.46 Mobile 33.82 46.22 Mobile 79 Relay stations will be authorized only 33.50 33.86 46.26 where a showing is made that a fire radio 33.54 33.90 46.30 Mob., Fixed 6 system cannot function satisfactorily 33.58 33.94 46.34 Mobile over necessary distances, or where, in an 33.62 33.98 46.38 Base, Mob. integrated system comprising. two or 33.66 46.06 If 46.42 " more fire licensees, the number of nec- 33.70 Base Mob. 46.10 , 46.46 July 1949 -formerly FM, and FM RAmo- ELECTRONICS 19 ff essary frequencies can be reduced. sub- 46.50 154.37 2500 to ject to certain limitations, mobile units 72.02 ,f to 154.43 2700 Op. Fixed 1 may be installed in public utility and 74.58 Op. Fixed 3 159.51 to 3500 to water department vehicles. 75.42 to ff 161.79 4 3700 Base, Mob. 1 ff Assignments: 75.98 " 3 166.25 5 6425 to Frequency 153.77 Mobile 170.15 5 6575 " 1 Available frequencies are listed in the 153.83 Mob., Fixed 6 454.05 to 6575 to accompanying table, subject to qualifica- 153.89 Mobile 455.95 1 6875 Op. Fixed 1 footnotes. tions set forth in the 153.95 " 952 to 11700 to 154.01 ,f 960 Technical Information: Op. Fixed 1 12200 Base, Mob. 1 154.07 1850 to 12200 to The same requirements apply to the fire 15.4.13 Base, It Mob. 1990 1 12700 Op. Fixed 1 as are listed under Tech- radio service 154.19 2110 to 16600 to nical Information for the police radio f, 154.25 2200 1 18000 ,f service. ,f 1 154.31 2450 to Base; Mob. 1, 2 26000 to only with 1 Limited to developmental operation 2500 Op. Fixed 30000 1 the assigned frequency and particulars of opera- tion specified in each authorization. from interference due stations on 5 2 Subject to no protection Channels 4 or 5. This frequency may be assigned to stations in of industrial, scientific, and medi- 4 Assignable frequencies to the operation spaced by 60 kc., the fire radio service, only at points within 150 cal devices in this band. beginning with the trequency 159.51 mc. and end- miles of New York, N. Y. 8 spaced by 40 kc., be- e Assignable frequencies ing with the frequency 161.79 mc. are available The maximum plate power input to the final ginning with the frequencies 72.02 and 75.42 on a shared basis to base and mobile stations in radio frequency stage of 74.58 and 75.98 the fire any transmitter author- mc. and ending with frequencies radio service, upon an adequate showing ized to operate on this frequency shall not exceed mc., respectively, are available on a shared basis of need and upon the condition that no harmful 3 watts. to operational fixed stations in the fire radio interference will be caused to the service of any 7 This frequency interfer- existing may be subject to change service on the condition that no harmful or future station in the railroad radio when the Atlantic City table of frequency alloca- ence will be caused to the reception of television service. tions below 27.50 mc. comes into force.

FORESTRY -CONSERVATION FORESTRY -CONSERVATION FREQUENCIES conservation base stations are Forestry- FREQ. CLASS NOTES FREQ. CLASS NOTES FREQ. CLASS with NOTES authorized to intercommunicate 2212 kc. Base, Mob. 6, 12 31.86 Base, Mob. 7, 9, 10 172.225 f, 8,10,14 in the same service, with tf mobile units 2226 6, 12 31.90 " 7, 9, 10 172.275 8,10,13 other stations in the public safety serv- f, f, 2236 6, 12 31.94 7, 9,10 172.375 8, 10, 14 at fixed locations. ,f ices, and with receivers 2244 6, 12 31.98 7, 9, 10 454.05 to Relay stations will be authorized only f, 30.86 mc. 11 46.54 455.95 1 is made that a forestry - ff where a showing 30.90 11 46.58 952 to conservation radio system cannot func- 30.94 ,f 11 46.62 960 Op. Fixed 1 over necessary dis- ff ,f tion satisfactorily 30.98 11 46.66 1850 to tances, or where, in an integrated sys- ff ,f ,f 31.02 7, 9, 10,11 46.70 1990 1 two or more forestry - tem comprising 31.06 7, 9, 10,11 46.74 2110 to conservation licensees, the number of ff ff ,f 31.10 7, 9, 10,11 46.78 2220 1 frequencies can be reduced. nesessary 31.14 7,9,10,11 46.82 2450 to Base, Mob., Frequency Assignments: 31.18 7, 9, 10 72.02 to 2500 Op. Fixed 1, 2 31.22 " 7, 9, 10 74.58 Op. Fixed 3 2500 to Available frequencies are listed in the f, 31.26 7, 9, 10 75.42 to 2700 Op. Fixed 1 accompanying table, subject to qualifica- f, 31.30 7,9,10 75.98 Op. Fixed 3 3500 to tions set forth in the footnotes. ,f 31.34 7,9,10 156.87 Base, Mob. 5 3700 Base, Mob. 1 ,f Technical Information: 31.38 7, 9, 10 156.93 5 6425 to ,f f, 31.42 7, 9,10 159.27 6575 " 1 The same requirements apply to the f, 31.46 7,9,10 159.33 6575 to forestry- conservation service as are If ,f 31.50 7, 9, 10 159.39 6875 Op. Fixed 1 listed under Technical Information for ff 31.54 7, 9, 10 159.45 f, 11700 to police radio service. ff 31.58 7, 9, 10 159.51 to 12200 Base, Mob. 1 ff i Limited to developmental operation only with 31.62 7,9,10 161.79 4 12200 to the assigned frequency and particulars of opera- ff tion specified in each authorization. 31.66 " 7,9,10 170.425 8, 10,14 12700 Op. Fixed 1 2 Subject to no protection from interference due to the operation of industrial, scientific, and medi- 31.70 7, 9, 10 170.475 8, 10, 13 16600 to If ff cal devices in this band. 31.74 7, 9,10 170.575 8, 10, 14 18000 1 s Assignable frequencies spaced by 40 ke., be- ginning with the frequencies 72.02 and 75.42 me. 31.78 " 7, 9,10 171.425 8, 10, 13 26000 to and ending with the frequencies 74.58 and 75.98 ff ,f inc., respectively, are available on a shared basis 31.82 7, 9, 10 171.475 8, 10, 14 30000 1 to operational fixed stations in the Forestry -Con- 171.575 ,f 8, 10, 13 servation Radio Service on the condition that no harmful interference will be caused to the recep- that, on an engineering basis, no harmful inter- tion, detection and suppression. tion of television stations on Channels 4 or 5. ference will be caused to the Maritime Mobile 10 This frequency is reserved primarily for as- 4 Assignable frequencies spaced by 60 kc., Service. signment to state licensees. Assignments to other beginning with the frequency 159.51 mc. and e The use of this frequency is subject to the licensees will be made only where the frequency is ending with the frequency 161.79 mc. are avail- condition that no harmful interference will be required for coordinated operation with the state able on a shared basis to base and mobile stations caused to the service of any Canadian station. system to which the frequency is assigned. Any in the Forestry- Conservation Radio Service upon 7 This frequency is available for assignment request for such assignment must be supported by an adequate showing of need and upon the condi- only in accordance with a geographical assignment a statement from the state system concerned, in- tion that no harmful interference will be caused plan. dicating that the assignment is necessary for coor- to the service of any existing or future station s This frequency will be assigned only to licen- dination of activities. operating in the Railroad Radio Service. sees directly responsible for the prevention, de- u This frequency is shared with the Urban 5 The use of this frequency may be authorized tection, and suppression of forest fires, subject to Transit Radio Service. to base and mobile stations in the Forestry -Con- the condition that no harmful interference will be 12 This frequency may be subject to change whets servation Radio Service on the condition that no caused to the service of any U. S. Government the Atlantic City table of frequency allocations harmful interference will be caused to the Mari- station. below 27.50 Mc. comes into force. time Mobile Service. Forestry- Conservation oper- 0 This frequency may be used for conservation >s This frequency will be assigned for use only ations at points within 150 miles of coastal areas activities upon the condition that no harmful in- in areas east of the Mississippi River. and navigable gulfs, bays, rivers and lakes may terference will be caused to the service of any 14 This frequency will be assigned for use only be authorized only after a factual finding indicates station using the frequency for forest fire preven- in areas west of the Mississippi River.

20 FM AND TELEVISION HIGHWAY MAINTENANCE HIGHWAY MAINTENANCE FREQUENCIES Highway maintenance base stations are FREQ. CLASS NOTE FREQ. CLASS NOTES authorized to intercommunicate with FREQ. CLASS NoTEs other fixed and mobile stations in the 33.02 Base, Mob. 6 47.38 Base, Mob. 7, 8 2450 to Base, Mob. same service, with other stations in the 33.06 6 72.02 to 2500 Op. Fixed 1, 2 public safety services, and with receivers 33.10 6 74.58 Op. Fixed 3 2500 to at fixed locations. Relay stations will 37.90 6 75.42 to 2700 Op. Fixed 1 be authorized only where a showing is 37.94 6 75.98 3 3500 to made that a highway maintenance radio 37.98 6 156.99 Base, Mob. 5 3700 Base, Mob. 1 system cannot function satisfactorily 46.86 7, 8 157.02 5 6425 to over necessary distances, or where, in an 46.90 7, 8 157.11 5 6575 1 integrated system comprising two or 46.94 7, 8 157.41 5 6575 to more highway maintenance licensees, the 46.98 7, 8 159.51 to 6875 Op. Fixed 1 number of necessary frequencies can be 47.02 7, 8 161.79 4 11700 to reduced. Subject to certain limitations, 47.06 7, 8 454.05 to 12200 Base, Mob. 1 mobile units may be installed in vehicles 47.10 7, 8 455.95 1 12200 to of contractors or others having direct 47.14 7, 8 952 to 12700 Op. Fixed 1 responsibility for maintenance, super- 47.18 7, 8 960 Op. Fixed 1 16600 to vision, or operation of public highways. 47.22 7, 8 1850 to 18000 1 47.26 7, 8 1990 1 26000 to Frequency Assignments: 47.30 7, 8 2110 to 30000 1 Except for systems licensed to states, 47.34 7, 8 2200 1 no assignments will be limited to the use of 2 Subject to no protection from interference due tenance radio service on the condition that to the operation of industrial, scientific, and medi- harmful interference will be caused to the mari- only one frequency per system. Available cal devices in this band. time mobile service. Highway maintenance opera- 3 Assignable frequencies spaced by 40 kc. be- tions at points within 150 miles of coastal areas frequencies are listed in the accompany- ginning with the frequencies 72.02 and 75.42 mc, and navigable gulfs, bays, rivers, and lakes may ing table, subject to qualifications set and ending with the frequencies 74.58 and 75.98 be authorized only after a factual finding indicates mc, respectively, are available on a shared basis that, on an engineering basis, no harmful inter- forth in the footnotes: to operational fixed stations in the highway main- ference will be caused to the maritime mobile tenance radio service on the condition that no service. Technical Information: harmful interference will be caused to the re- e This frequency is shared with the special ception of television stations on Channels 4 or 5. emergency radio service. 4 Assignable frequencies spaced by 60 kc, be- 'r This frequency will be assigned only in accor- The same requirements apply to the ginning with the frequency 159.51 mc, and ending dance with a geographical assignment plan. highway maintenance service as are list- with the frequency 16L79 mc, are available on a s This frequency is reserved primarily for as- shared basis to base and mobile stations in the signment to highway maintenence systems operated ed under Technical Information for highway maintenance radio service upon an ade- by states. The use of this frequency by other quate showing of need and upon the condition that highway maintenance licensees will be authorized police radio service. no harmful interference will be caused to the only where such use is necessary to coordinate service of any existing or future station operating activities with the particular state to which the such 1 Limited to developmental operation only with in the railroad radio service. frequency is assigned. Any request for use the assigned frequency and particulars of opera- e The use of this frequency may be authorized must be supported by a statement from the state tion specified in each authorization. to base and mobile stations in the highway main- concerned.

SPECIAL EMERGENCY SERVICE SPECIAL EMERGENCY SERVICE Special emergency stations are intended FREQ. CLASS NOTES FREQ. CLASS NOTES FREQ. CLASS NOTES for use by persons having establishments 2726 kc. Base, Mob. 9 75.42 to 2450 to Base, Mob. in remote locations where other com- 3190 9 75.98 Op. Fixed 3 2500 Op. Fixed 1, 2 munications facilities are not available, 33.02 mc. 6 157.47 Base, Mob. 5, 8 2500 to a relief agencies which have disaster 33.06 6 159.51 to 2700 Op. Fixed 1 nor- communications plan, physicians 33.10 6 161.79' 4 3500 to in remote areas, ambul- mally practicing 37.90 6 161.85 5, 8 3700 Base, Mob. 1 responsible ance services, beach patrols 37.94 6 161.91 5, 8 6425 to for life saving, rural school buses and " t 37.98 7 161.97 6575 1 common carriers. 99 communications 47.42* 7 454.05 to 6575 to Special emergency base stations are 47.46 455.95 6875 Op. Fixed i authorized to intercommunicate with 47.50 952 to 11700 to other fixed and mobile stations in the 47.54 960 12200 Base, Mob. 1 same service, with other stations in the 47.58 1850 to 12200 to public safety services, and with receivers 47.62 1990 12700 Op. Fixled 1 at fixed locations. Transmission of non - 47.66 2110 to 16600 to is emergency communications strictly 72.02 to 2200 18000 1 prohibited, except that common car- 74.58 Op. Fixed 3 26000 to for restor- riers may use communications 30000 1 communica- ing temporarily a normal Technical Information: 3 Assignable frequencies spaced by 40 kc. be- result of an ginning with the frequencies 72.02 and 75.42 mc. tions service disrupted as a and ending with the frequencies 74.58 and 75.98 emergency. The same requirements apply to the mc., respectively, are available on a shared basis highway maintenance service as are to operational fixed stations in the special emer- gency radio service on the condition that no harm- Frequency Assignments: listed under Technical Information for ful interference will be caused to the reception of television stations on Channels 4 or 5. in special police radio service. Operation of mobile system the L Assignable frequencies spaced by 60 kc. be- emergency service is restricted to the use ginning with the frequency 159.51 mc. and ending with the frequency 161.79 mc. are available on a of only one frequency per system. Avail- I Limited to developmental operation only with shared basis to base and mobile stations in the assigned frequency and particulars of operation special emergency radio service upon an adequate able frequencies are listed in the accom- specified in each authorization. showing of need and upon the condition that no panying table, subject to qualifications 2 Subject to no protection from interference due harmful interference will be caused to the service to the operation of industrial, scientific and medi- set forth in thé footnotes: cal devices in this band. (Concluded on page 45) July 1949 -formerly FM, and FM RADIO- ELECTRONICS 21 SIGNIFI- SPOT NEWS NOTES ANTACTIVITIE1SOF EOPLE &UTCOMPANIES

before the end of this year. This an- When sets roll out in August this will nouncement is of special interest because be the third RCA plant producing TV of Eimac's strong position in transmit- receivers. Others are at Camden and ter tubes, and their many contributions Indianapolis. to tube design and manufacturing methods. Honorary Degree: In recognition FM for Handi-Talkies: of his achievements in the field of television, the degree If of the famous handie -talkie of World Doctor of Engineering was conferred on War 2 goes into battle again, it will be Dr. Allen B. Du Mont during the com- the new design, operating on FM. mencement exercises at Brooklyn Poly- RMA -IRE Fall Meeting: tech on June 15. Will be held this year at Hotel Syracuse, Slow -Speed Records: Syracuse, N. Y., and not at Rochester, As far as we've been able to observe, the as in years past. Session will run from introduction of 45 -RPM records can- October 31 to November 2. Further in- celled out public interest in long -playing formation can be obtained from Virgil discs by introducing an element of con- Graham, Chairman, Sylvania Electric fusion. Net result, therefore, was only Products, Inc., 40 -20 Lawrence Street, to hurt the sale of 78 -RPM records and Flushing, N. Y. good radio-phonograph combinations. "Don't look now, but I think that newest arrival was a State Trooper!" New FM -AM Set: $350,000 FM Promotion: General Electric Gordon Gray: has just announced a This sum will be spent by Zenith to high -sensitivity, 6 -tube set featuring the launch the high -sensitivity, straight FM Newspaper publisher and pioneer broad- Armstrong limiter -discriminator. set described in detail by G. E. Gustaf- caster of Winston -Salem was confirmed son in the April issue of FM -TV, and unanimously Transit Radio Sponsors: by Senate on June 13 as further discussed by Ted Leitzel in the Secretary of the Army. Even before In ] 1 months, Transit Radio has built May issue. National schedule includes his prewar FM station W41MM (now its list of program sponsors to 355, in- $100,000 in Successful Farming, Capper's WMIT) was completed on Clingman's cluding department stores and specialty Farmer, Progressive Farmer, Ladies' Peak, N. C., he shunned the short cuts shops which have not used AM time. Home Journal, and Saturday Evening and joined the Army as a private. At Systems are already operating in 10 Post, backed by $250,000 to be spent the end of the war, he had risen to the cities, with 5 more already under con- chiefly in newspapers across the Country. rank of Captain. So we shall have as tract to start, and others in process of Secretary of the Army a man who knows negotiation. New Sales Setup: the Service from all angles, even the way Under a new arrangement, 1950 Chicago Parts Show: mobile radio it looks to a rookie. equipment manufactured by West Coast Will eliminate all restrictions on attend- This is Really Good: Electronics Company, 1601 S. Burlington ance. Manufacturers selling through Avenue, Los Angeles, will be sold by its We've held forth at some length about jobbers will be permitted to display their own dealer organization. Previously, all the confusion caused by using the words products in the exhibit hall, in display sales were handled by Mobile Communi- "radio and television" as a means of rooms, or in both places. Purpose is to cations Company. This concern will differentiating between audio and video increase volume of orders placed during now act as a WCEC dealer. broadcasting. So we nearly slid off our the Show. chair when we heard this question on a FMA Policy: Commissioner Frieda B. Hennock: quiz program: "If audio means radio, We are not impressed favorably by the what does video mean ?" Speaking at the dedication of ILGWU's Association's recent attack on the Chi- New York FM John Ballantyne: station WFDR: "People cago station that cut its hours of FM won't listen to FM merely because it programming. Public interest, conven- On June 10, John Ballantyne, chairman has technical advantages over other ience, and necessity will be served much of the board of Philco Corporation, col- media. The medium, after all, is but a more effectively if FMA efforts are di- lapsed and died while delivering a com- tool. It must be used properly to at- rected toward making converts rather mencement address at the Meadowbrook tract the public." than creating enemies. No one profits School for Boys. He was 49 years old. Norman Wunderlich: from winning an argument and losing His son John William, age 13, was a a sale! member of the graduating class. Perhaps There's nothing official, but we look to the most widely known figure among the see him back in mobile communications C -R Tube Development: retail radio trade, he joined the company again, now that the FCC allocations plan Sylvania is setting up a new division to in 1934 as treasurer, and served as presi- has opened the way for wide expansion. specialize in the design, engineering, and dent from 1943 to 1948. ` production of picture tubes at Seneca More TV Set Production: Another C -R Tube Producer: Falls, N. Y. General manager cif the About 80,000 square feet of space at division will be W. H. Lamb. Production Eitel-McCullough's new Salt Lake plant RCA's Bloomington, Ind. factory is be- of C -R tubes will be continued at will be producing 16 -in. metal TV tubes ing converted to TV set manufacture. Ottawa, Ohio, and Emporium, Pa.

27 FM AND TELEVISION ticular industry or group of users is pos- sible; cooperation with more than one in- dustry or group of users has been found well -nigh impossible of prompt accom- plishment. The licensee has the legal option, however, to move or not to move prior to the expiration of his present license. Industrial Radio Services: 1. Are we eligible for a special Indus- trial Radio Service grant or not? Section 11.501 of the Industrial Radio Service Rules disqualified any person AFTER four years of labor (pains to to 3,000 kc., is somewhat more compli- who is engaged in "activities of a service industry) , the Federal Communica- cated. These assignments are subject to 01 distribution nature." As a consider- tions Commission has produced its determinations reached at the Fourth able number of such persons had ob- final Rules and frequency assignments Inter -American Regional Radio Confer- tained experimental authorization, they for all the land mobile radio services. ence, which convened in Washington in are now concerned as to whether their With frequency revisions issuing at the April, 1949 and is still in session at this activities fall within the proscribed char- rate of one a month ever since May, writing. This conference will determine acter of the Rule. One example of the 1945, when the Commission adopted its the overall allocations for the North and questions presented is that raised in the of allocations above 25 mc., the South Americas, which will, of course, Report case of armored car fleets, which will greeted the deliv- accord with the international allocations mobile radio industry probably be found to be excluded under ery of the filial Rules with a sigh of decided upon at the Atlantic City con- the wording of Section 11.501. That relief. vention. After the Fourth Inter -Amer- sloes not mean that the equipment in- Everyone interested in the new Rules ican Regional Radio Conference has vestment of these armored car licensees has now obtained from the concluded its deliberations, FCC and probably bas been wiped out. They may continue of Documents a copy of IRAC will divide the bands between non - Superintendent to use their equipment by taking service the Federal Register of May 6, in which government and government assign- from a common carrier or limited com- were collected in defini- ments. Definitive allocations will there- the various Parts mon carrier, but they will probably not tive form. This month, we shall dis- after be issued bÿ the FCC, with appro- be found eligible to operate their own raised priate time for readjustments. cuss the questions most frequently private radio communications systems Commission concerning the in- Controlling factor in all frequency - at the after November 1, 1949. new Rules. shifting cases is terpretation of the the well- established prin- Another provision that is giving ciple that a station license, once issued, trouble is the requirement for otherwise - Public Safety Rules: cannot thereafter be modified legally by qualified special industrial applicants to When do we have to change frequencies the Commission unless a prior public use radio "within the yard area of a sin- to accord with the new frequency assign- hearing has been afforded to the licensee. gle plant." Many of our largest indus- ments that became effective July 1, This fundamental principle was estab- trial concerns have separated plants 1949? lished in the broadcast field by Su- the which, functionally, represent a single Frequencies now in _use by public preme Court in the case of F.C.C. vs. Na- plant area. Some slight physical sepa- safety services in the .152- to 162 -mc. tional Broadcasting Co. (KOA), 319 U. ration may exist between plants, how- band that do not accord with the fre- S. 289. The reasoning of the KOA case ever, so that unless a reasonable inter- quency assignments that . became effec- is equally applicable to non- broad- the pretation is accorded this rule, very arbi- tive on July 1, 1949 may be continued cast field. trary and unreasonable results may be in use until the expiration of a station's Since, presumably, the Commission expected from its literal interpretation. present license term. does not wish to be bogged down with If the Commission's Law Department Frequencies in the 72- to 76 -mc. band the countless hearings that would be nec- does not adopt a common sense interpre- used for mobile communications must be essary if each licensee now using a fre- tation of the rule, the Commission itself surrendered by June 14, 1953, five years quency not in accord with the present should and probably will grant a waiver following the effective date of the Com- plan of assignments were called upon to of the rule in such cases, upon appro- 8487. 'Fre- mission Report in Docket No. change frequency at once, the Commis- priate request. band for fixed -cir- quencies used in this sion will undoubtedly permit all licensees 2. May the 72- to 76 -mc. operational be continued until cuit purposes may to use presently -assigned frequencies fixed circuit band be used for communi- if no inter- June 14, 1953, and thereafter until the expiration of their outstanding cations as well as control-circuit pur- reception ference is caused to television licenses. When the license renewal ap- poses? ill the area of operation. plication is presented, however, the FCC Yes, provided no interference is caused Frequencies used in the 30-mc. band in all cases will require a shift in fre- to TV reception on the adjacent TV that do not accord with the plan of as- quency to accord with the presently -ef- 4 5. , channels and signments that became effective for that festive assignments. 3. What frequency limitations govern band on April 1, 1947 (FCC public no- There is also little doubt that the FCC the various methods of extending the tice 3529) may be continued until July would welcome a prior voluntary shift range of the 25- to 50 -mc. and 152- to 1, 1950, when frequencies must be on the part of all those now using fre- 162 -mc. bands? changed to conform with the plan of quencies that do not accord with the new The very large area coverage required April 1, 1947. assignments. Such voluntary moves for certain types of industrial operation, The situation in the medium band, 300 would appear to be indicated in the in- principally petroleum, presents a need terest of better radio use on the part of for extending the communications range *Courtney, Krieger, and Jorgensen, Washing- all concerned. within a par- in these bands. This can be accom- ton 6, District of Columbia. Cooperation July 1949 -formerly FM, and FM RADIO -ELECTRONICS 23 plished through the use of control and tion involved will warrant the use of 3. What procedure will govern the repeater stations or by mobile relay sta- microwave equipment, the extended assignments of the new channels? tions. In the industrial and land trans- range required is obtained in the follow- No licenses were issued prior to July 1, portation radio services, however, the ing manner. Using the letters of the when the Rules became effective. Even heavy communications needs of these above example again, the control station after that date no licenses will be issued users have required the Commission to at H would transmit to the repeater for the use of taxicab channels 3 and 4, ban, least at temporarily pending the station located at T on fixed- circuit fre- which are now assigned to Telephone submission of further information, mo- quency A (72 mc. or microwave fre- Company use in a number of metropoli- bile relay stations. quency) ; T would transmit the commu- tan areas under experimental licenses ex- A mobile relay radio station is defined nication to the out -of -range mobile unit piring November 1, 1949. Taxicab ap- in the Public Safety Rules (where their M on mobile service frequency B. Re- plications requesting the use of taxicab use is permitted) as a base station estab- versing the communication, the mobile channels 3 and 4 will be co- ordinated lished for the automatic retransmission unit would transmit on the same mobile with the common carrier engineering de- of mobile service communications which service frequency B to repeater station partment of the Commission. As soon originate on the transmitting frequency T; and T would then retransmit the mo- as the Telephone Company completes of mobile the stations and which are re- bile unit communication to the other- its move to the new channels assigned transmitted on the receiving frequency wise out -of -range headquarters office for their purposes (which they may do of the mobile stations. Let us assume on fixed -circuit frequency C. on July 1 and must do by November 1) under that method of operation that It will be noted that where communi- taxicab channels 3 and 4 will be avail- point II represents the dispatching office cations systems involve the use of con- able for assignment. Announcement of located on level terrain, T indicates the trol and repeater stations, three frequen- definitive procedures regarding the as- mountaintop location of the mobile relay cies are used as against the two used in signment of the present and new taxi- station, and M indicates the mobile unit the mobile relay operation. However, cab channels were expected from the which is out of range of H but within only one of the three frequencies em- Commission at the time this material range of T. Under that setup, the con- ployed in the control and repeater com- was prepared. trol station at H would transmit to T on munications setup is a mobile service 4. When will railroads that are using mobile service frequency A; the base sta- frequency, while both frequencies em- the now -deleted railroad frequencies be tion at T would automatically retransmit ployed in the mobile relay system are obliged to change frequencies? the communication to M on mobile serv- mobile service frequencies. As of the Those railroads which are using any ice frequency B. Communications from moment, therefore, mobile relay opera- of the 21 deleted frequencies may con- the mobile unit to the headquarters of- tion is out for the power, petroleum, and tinue their use until the expiration of fice would be effected in reverse: M, other industrial radio users. In a great their current licenses. Voluntary re- using the same frequency as the control many areas this will force industrial users quests for change of frequencies will be station at H, would transmit on mobile immediately, and many land transporta- entertained, perhaps solicited. The rail- service frequency A, which would be re- tion users later, into microwave -circuit roads will have to re -make their master ceived at T and retransmitted to H on utilization. The present expense factor allocation plan, which was based on the mobile service frequency B. will undoubtedly result in some protest assignment of 60 frequencies for rail- It will be noted that under this system on the part of the petroleum and power road purposes, asuming ultimate denial two land mobile service frequencies ate utilities to the mobile relay station of the May 26 petition the railroads filed required, and this is the precise reason proscription. It is expected that the for vacation of the Commission's deletion why the Commission has banned mobile FCC will give further consideration to Order, or for re- opening for hearing and relay stations for industrial and land this problem in the light of the presen- reconsideration. transportation users. The use of fre- tations to be made by the petroleum 5. Under the new Rules, what is the quencies between 30 and 40 mc. for mo- and power utility industries. position of the trucking companies? bile relay purposes is not indicated Land Transportation A number of truckers are bothered because of the long- distance sky -wave Services: by this eligibility question. The High- skip characteristics of this band. Assign- 1. Does the first taxicab company to way Truck Radio Service Rules specifi- ments between 152 and 162 mc. are lim- use the present frequencies on an ex- cally provide that "the service is not ited because of the extreme shortage of perimental basis have any priority as available for truck routes within a single frequencies in this band. The petro- against late -comers in the exclusive regu- metropolitan area." Exclusively intra- leum industry, for example, has only nine lar use of these frequencies? city truckers cannot have their own pri- mobile frequencies in the 152- to 162 -mc. No. This is one case where possession vate radio systems. A city newspaper band, shared with Forest Products users. is not nine points of the law. All fre- delivery truck, for example, is clearly However, the extended communica- quencies in the safety and special serv- out. An intercity trucker, operating be- tions range often necessary can be ob- ices are assigned on a non-exclusive basis. tween New York and Washington on a tained by use of control and repeater The first user does not obtain any home- route basis, is clearly in. But how about stations operating either at 72 to 76 mc. stead rights. If the companies now using the trucker who delivers to an airport or in the microwave bands. The objec- the present channel cannot agree on a quite a few miles out of the city, or one tion to the use of the 72- to 76 -mc. band move that will be in the interest of all who delivers butane gas or oil on a is that it is extremely difficult to avoid concerned, every company that applies scheduled route? A number of marginal interference with the adjacent TV chan- for the present channel will get it. It's cases such as the foregoing will give the nels, a necessary prerequisite to any agree or suffer. FCC legal staff some headaches (in addi- fixed -circuit authorization in that band. 2. Will the Commission entertain tion to the present railroad situation) The objection to microwave stations has applications for all four taxi channels and will probably require final treatment been the high cost of equipment, but in the same area, although separted by by the Commission itself on a case -to- prices will probably come down. only 60 kc.? case basis. The greatest care should be Assuming, however, that a fixed circuit Apparently yes, especially if supported exercised in the preparation of these can be operated without adjacent chan- by an overall agreement on the subject marginal applications. nel TV interference, or that the opera- by all operators in the area. (To be continued next month)

24 FM AND TELEVISION DYNAMOTOR POWER SUPPLIES DESIGN, PERFORMANCE, AND SERVICE DATA ON DYNAMOTORS SUPPLYING HIGH VOLTAGE DC TO MOBILE TRANSMITTERS AND RECEIVERS -'By ROBERT W. CARTER* be regulated by changing field excita- 10 SECOND TRANSMISSIONS 36,000 72.000 108.000 tion. Because both primary and second- ary windings are wound on a common core and rotate in the same field circuit, 2R1 ...... 1...... the output voltage varies in direct pro- portion to fluctuations of input voltage. :::ï:::::::m:m:e...... ::.:, Many factors, not generally recognized ...... m:m::m:::::::::..:.::°:.:_°:: E:_m :::_ ::::::EE by radio engineers, enter into dynamotor :..7.-- ::: p :...... ::....:È.: design. We learned much, of course, dur- ...... i.:: RECOMMENDED ... ing the war about increasing the effi- .... BRUSH .... ciency and extending the life of dyna- ...... REPLACEMENT ...... motors intended to deliver optimum 10o 200 300 mobile service. For example, we use f26- RUNNING HOURS gauge transformer -grade armature lami- nations, cross -stacked when assembled, to 2. Rate of wear of input brushes. Output brushes wear 3 to 4 times longer Fig. reduce eddy current losses and increase THE dynamotor has become recog- a single DC field. Two standard types efficiency. This permits a savings of nized as a highly dependable power are shown in Fig. 1. Unlike a motor about 3 amperes battery drain on an supply wherever DC to DC conversion is required. Small, efficient, and capable VVVVVVVVVVV'VVV of generating high output DC voltage MOTOR. 6 V. TIMING WAVE, 604, and current, dynamotors afford years of reliable service. Police and fire depart- ments, aircraft, marine, taxicab, forestry, railroad, and other branches of mobile communications now employ dynamotor OUTPUT, 280 MI LLIAMPS. power supplies because of their depend- ability as a source of high -voltage DC. by the Armed They are also specified OUTPUT, 420 V. Services for the majority of military com- CARTER MODEL 4228VS: 280 MA munications. RATED LOAD,INPUT, 5.6 VOLTS AT 32 AMPS, OUTPUT, 420 VOLTS AT & Performance: 280 MA,80 %OF OUTPUT VOLTAGE Dynamotor Design REACHED IN 150 MILLISECONDS

In brief, a dynamotor consists of a pri- INPUT, AMPS. mary or motor winding for rotation, and a secondary or generator winding to pro- vide the specified output, both wound on Fig. 3. Average starting time required for Genemotor to reach 80% of rated output a common armature core and rotating in generator, with separate field circuits, average 6 -volt transmitter dynamotor. *President, Carter Motor Co., 2644 N. Maple- dynamotor output voltage cannot High -dielectric slot in insulation virtually wood Avenue, Chicago 47, Ill. the

right, has alnico field magnets Fig. I. Standard dynamotor designs. Genemotor, left, has laminated field frame; Magmotor, July 1949 -formerly FM, and FM RADIO -ELECTRONICS 25 eliminates armature grounds. Input and This assures highest possible quality output commutator me- the use of oscilloscopes, for they disclose life has been in- chanical performance. Ball bearings creased by using lu- much information that meters cannot re- 25- to 30 -ounce silver bricated with long-life grease, alloy copper now op- veal. Long brush and commutator segments to resist the an- erate satisfactorily at temperatures life nealing effects from are entirely dependent upon commutator of heat, and to assure approximately -55 to +95 °C., depending film, the microscopic cupric oxide on the dynamotor model. film a cs. kw millionths of an inch thick, created OUTPUT by the electron transfer, friction, IR Brushes and Commutators: oxidi- zation, and other electrical, chemical, o Brushes of course, are all important, > and go hand in hand with ? EFFICIENC=_ commutation. RF CHOKE IRON Carefully RED = - selected grades of the proper CHOKE m size are essential to longest possible f O -' 11°I1MF ElDUNA- _001 4 MF N =NPUT brush and commutator life without loss 0 MOTOR p MICA of efficiency T TOIL due to excessive drag on the 0111.101 /. armature. Consideration BLACK _ of duty cycles COMMON TO HOUSING o loo 300 500 also enters into the brush performance, MA LOAD a: intermittent transmitter operation re- Fig. 5. Filter for receiver power Fig... Performance of high -efficiency unit quires that brushes withstand frequent supply starting surges. An example of input and dynamic actions. Brush and good commutation. Armatures are com- both brush wear on a popular transmitter mutator wear and the coefficient statically and dynamically balanced of fric- to Genemotor model is illustrated in Fig. 2. tion are greatly affected by assure smooth mechanical performance. atmosphere, Output brushes usually wear 3 or 4 times presence of acids, smoke, oil, and other Ball bearings and sleeve -type oilless longer than input brushes, (300,000 to contaminations which break down bearings have proved to be best suited the 400,000 ten -second transmissions aver- protective film and greatly accelerate for mobile dynamotor service. The wear. The commutator finish is highly sleeve type is preadjusted for end play important to long brush and commutator and locked at the factory to assure life, as well as to reducing AC ripple. proper performance. A felt washer, sat- Exhaustive tests with many types of urated with oil or grease, is usually finishing tools and grinders have been placed around or next to the bearing. made in an effort to obtain the ideal The porous bearing material absorbs this surface. The diamond tool has lubricant as needed, depending been upon found to provide by far the smoothest temperature requirements. In normal and most satisfactory finish. Brush service, this type of bearing requires and no commutator life are greatly prolonged, additional lubricant for the life of the and ripple is reduced when dynamotor, providing dirt commutators is not allowed are diamond-lapped. The to enter the bearing. commutators should never be touched with the fingers, Most transmitter dynamotors, how- as perspiration leaves an oxide on the ever, employ ball bearings, as they segments that may possibly impair possess certain advantages over the commutation. sleeve type. Single row, sealed or shielded bearings are used to prevent Regulation and Fig. Ripple: the entrance of dirt or dust. 6. Normal .8% unfiltered AC ripple Super - On crowded or busy channels, mobile precision grades are used to assure quiet , age) and therefore require virtually no transmitter dynamotors must start in- mechanical operation, as commercial attention. stantly. Otherwise, the first words of a types are not satisfactory. We pre- Commutation of DC rotary machines message will not get on the air. Com- assemble and line -ream the dynamotor embraces far more scientific research pound -type field coils with a series wind- frames for precision alignment. Arma- than is realized by most engineers. In ing, in addition to the regular shunt field tures are then assembled in the frames. this work we have been aided greatly by (Continued on page 39)

Fig. 7. These tráñsients, due to incorrect Fig. 8. This electrical noise is caused by Fig. 9. Typical trace due to open second- secondary turns, cannot be filtered out poorly -seated input and output brushes ary winding or commutator connection

26 FM AND TELEVISION MOBILE RADIO SYSTEMS, Part 1 DIRECTORY OF MOBILE RADIO SYSTEMS OPERATED BY POLICE, FIRE, FORESTRY - CONSERVATION, RAILROADS, AND OIL COMPANIES, CORRECTED TO JUNE 1, 1949

ABOUT THIS DIRECTORY KOCM 2490* MUNICIPAL & COUNTY POLICE INFORMATION Oroville 1 KSPQ 39.38 2474* 1. This Directory, published by authority of the Federal Communications Com- Oxnard KOXC ALABAMA 15 KOXC 156.33 is from FCC license records. mission, compiled directly pacific Grove KAZI 1674* Alexander 15 KIA303 155.01 2. Mail addresses are shown for each system, except experimental repeater 1 KA'LI 30.58 7 WRBD 33.10' 156.57 Anniston stations. Municipal stations should be addressed "Police Headquarters" or 13 KAZI 10 K1A241 155.01 6 KMA38) 37.10* Athens County systems, marked "C ", show the name Palm Springs Auburn 6 WEQM 155.01 "Fire Department Headquarters ". Palo Alto 17 KGHK 33.78* be "County Sheriff's Office ". Autauga 2 KA3I15 37.50 of the city in parenthesis. They should addressed Palos Verdes Estates 1 KQXK 37.90' Baldwin C (Bay Minette) 2 WKW 3'7.50 State police systems should be addressed "State Police Barracks ". Pasadena 61 KGJX 33.22* Bessemer 45 WY.IiI 155.13 1 KII)W 30.58' 3. The number preceding the call letters indicates the number of mobile Perris Birmingham 1 WJGZ 2382* Petaluma 4 KMA399 154.89 WPFM 2382* units. Piedmont 16 KQCP 37.22* 19 WPFM 30.58' frequencies are shown following one call, the transmitter Pittsburgh 3 KQBT 30.70 30.08' 4. Where several 1722' the different frequencies listed. Plumas C (Quincy) KMA380 119 WPFM 30.59 operates on 8 KMA389 39.38 30.9k 5. Equipment used for geophysical exploration is indicated by "Geoph. Mobile ". Pomona KMA384 1714' Blount C (Oneonta) 2 WAQJ2 3'/.50 35 KMA384 33.22' Butler C (Greenville) 2 WBTK 37.50 PART 2 of the Directory, including systems operated by taxis, public utilities, and KA LM 17.14' Calhoun 4 WCTM 37.50 other services, appears in each January issue. 3 KQAU 37.10 8 WCHG 1.'.5.61 Porterville Chickasaw new applications, 1 KQAX 35.10 2 WAEV 3'/.5í t NEW APPLICATIONS:For information on the weekly report of 156.37 Choctaw C (Butler) Red Bluff 10 KMA377 Clarke C (Grove Hill) 2 WCH.T 37.50 address Directory Editor, FM -TV Magazine. 4 KMA353 154.65 37.50 Redding Clay C (Ashland) 3 WK.SF 1 ) KQFT 33.22' 37.50 Redlands Cleburne C (Heflin) 2 WCML Redondo Bch 3 KTEQ 155.61 3 WKIH 37.50 1674' Colbert C (Tuscumbia) AM transmitter. All others are FM. Redwood City KRAZ Cullman 20 KIA451 155.01 *Indicates Arkansas City) 1 KSDC 31.50 Escondido KQ}iX 3 KROG 3 WKAD 35.50 Rialto Dothan Fayetteville 2 KRTJQ 33.5E' Eureka 10 KQRh4 If 5.25 Richmond KRLW 31.50 2 WXAI 37.50 Elmore C (Wetumpka) Forrest City 2 KÁ2681 35.78 Fairfax 2 KDIC 33.22 83 KRLW 155.37 2 WFGB 37.50 33.78 Escambia C (Brewton) Fort Smith 4 FNHA 30.58' Fairfield 10 KAGR 30.98' 73 KR LW Etowa C (Gadsden) 3 WIYU 37.50 Springs Nat'l Fresno 68 KGZA 35.22 KMA358 31.50 155.61 Garland C (Hot Fairfield lb KIA535 Park) KQMC 2403' Fullerton 6 KQBN 37.34' Riverside 6'd KQJE 30.58* 4 WKUH 35.90 Florence KQEH 2436' Gardena 5 KMA387 155.61 Riverside C (Riverside) 157 KQSG 30.58* Fort Payne 10 KIA512 155.01 8 KQEH 30.58 3 KQEG 39.10' KERC 24.42' WQIG 2382' 1674' Gadsden Helena 2 KIKS 30.70 Gilroy KROB 1 KEZE 24.42' 16 WQIG 37.02' 60 KQCI 156.57 4 KKA704 156.69 Glendale Roseville 1 KRPD 35.22 C (Eutaw) 2 WRTW 37.50 I W6XWC 74.58' Greene Ho Springs C (Malvern) 6 KKA267 3x.10 1 KRPC 33.22 WSMG 37.50 Ross Hale C (Greensboro) 2 Jefferson C (Pine Bluff) KQGT 2406' Glendora 3 KBPA 155.49 Sacramento C (Sacramento) 10 KFPN 154.77 3 WNME 37.50 Houston C (Dothan) 2 KQGT 30.58' Glenn C (Willows) 5 KQVE 39.38 Sacramento KPiGF 1722' 4 35.90 Huntsville WMHA 2 KQGT 33.58 Grass Valley 1 KGVC 35.22 `3 KNGF 154.77 C 2 WUAZ 37.50 10 KAGS 155.61 Jackson (Scottsboro) Jonesboro 1) KIHR 156.69 Hawthorne 1 KSPD 1722' 5 155.01 Jasper WKDF Little Rock 40 KKA513 155.61 Hemet 1 KBJT 30.58' Salinas KQHY 150.57 6 WQFR 37.50 Jefferson C (Birmingham) Mississippi C (Blytheville) 14 KPMA 33.`8* Hermosa Beach ` KRMZ 155.61 San Anselmo KQJ3P 33.22. C 2 WDPM 37.50 7 35.66' Lauderdale (Florence) Monticello ' KPDM 2406* Hillsborough KMA358 San Bernardino 33 KQAC 33.22' Lawrence C (Moulton) 2 KA3293 37.50 2 KPDM 30.58' 1 KANQ 1674* San Bernardino C 37.50 Lee C (Opelika) 2 WCVF. tlewport 16 KRKI 155.01' Humboldt C (Eureka) 7 KHCP 33.78 (San Bernardina) 45 KSBC 33.22' Limestone C (At hen 2 WDRP 37.50 4 KQAL 37.34' 11 Little Rock ll KRAE 156.69 Huntington Bch (Barstow) 3 KHlM 33.22' Macon C (Tuskegee) 2 WIJF 37.50 2 Y.SGO 31.53 Huntington Park 13 KHPM 39.90 San Benito C (Hollister) 8 KDHB 35.10' 37.50 Ouachita Madison C ( Huntsville) 2 WLCZ Paragould 5 K1(Á673 155.01 Imperial C (Centro) 21 KEZQ 35.10 San Buenaventura 14 KACIJ 30.58' 3 KA2851 37.50 Marengo C (Linden) Pine Bluff 4 KDBR 37.13 Indio 2 KQJIJ 30.58* i5 KACK 156.33 Marshall C (Guntersville) 2 WMDO 37.50 12 KÁ2955 155.61 Inglewood 25 KMA309 35.50 San 3 KRGK 33.78' 155.13 Pulaski C (Little Rock) Carlos Mobile 50 KIA559 11 33.22* Kensington 4 KCSQ 37.78' 154.89 Texarkana KTAP 19 KRGK 155.97 C Dorado) 6 KWXI 37.10 Kern C (Bakersfield) K5,4A338 2414' San Diego 3 Y.MA363 2490' 20 WNDM 37.50 Union (El Mobile C (Mobile) 5 KIDIJ 155.25 78 KMA338 31.78' 3)4 KMA363 33.78' 50 WMPM 155.01 Van Buren Montgomery Washington C (Fayette 11e) 5 1(KÁ683 37.10 11 KMA331 156.21 304 KMA363 37.34' 154.89 Kings C (Hanford) 6) KEWB 37.78 West Helena '. KUHE 30.70 2) KMA363 155.37* Morgan C (Decatur) 2 WEHY 37.50 KEWB 2414* KFWL 24.90 Muscle Shoals 1 WVJR 33.50 5 Laguna Bch KQBN 37.34' 1 KHKF 2490' 1 WDBZ 35.90 CALIFORNIA 13 Northport Lake C (Lakeport) KAVL 33.22 San Diego C (San Diego) 55 KQOV 37.34' Piedmont 8 KIA553 155.01 2 33.78' La Mesa KEZT San Fernando 3 KRMQ 39.50' C 3 KA3250 37.50 I F.ñKQ 1658* 1 33.22 Pike (Troy) Alameda C (Garlc:r.:;i Larkspur KDII San Francisco e4 KGPD 39.38 Randolph C (Wedowee) 2 WKXQ 37.50 KMA217 155.61 C 4 35.38 Alameda Lassen (Susanville) KAEX San Gabriel 6 KQBL 31.50' St Clair C (Pell City) 2 WXAE 37.50 40 KMA217 154.65 La Verne 2 KQPZ 33.22* San Jacinto 1 KQHV 30.58* Selma . 1 KIA528 2382* 5 KGWC 37.78' 5 KMA3E5 155.37 Albany Lindsay San Joaquin C (Stockton) 2`. KAPH 155.61 Sheffield 27 WKIM 33.50 20 KMA247 155.13 8 KIIGY Lodi 39.5) 1 KAf-H 35.50 Shelby C (Columbiana) 2 WSFD 37.50 Alhambra 16 KRBQ 31.50' Lompoc 7 KGCJ 1!6.33 155.01 San Jose KMA353 1674' Sylacauga 8 WBVS Alturas 1 KSYH 39.38 Long Beach 111 KQAO 31.78' KMA359 165.13 5 35.90 If Tuscaloosa WQLH 4 KQCL 37.34' 1 Anaheim KQST 33.10' San Luis Obispo 2 KRAW 30.53* C 3 WJWN. 37.50 5 37.02* 1 Tuscaloosa (Tuscaloosa) Antioch KS1IW KBQW 33.1)' 8 KQ)(A 2 WRSN 37.50 KQAP 156.69 Walker C (Jasper) Arcadia 24 KQ)(I 33.13* San Marino 28 KMA235 156.33 1 KCLN 1613' Arcata Los Angeles 265 KGPL 155.37' San Mateo KQDA 37.26 ARIZONA Atherton 2 KQXC 33.78' 466 KGPL 155.37 37.42 154.65 30 KQDA Auburn 5 KRQP 1 KNGX 173)' 155.49 San Mateo C (Redwood Apache C (St. Johns) 5 KOA237 39.18 Azusa 5 KMA238 6 KQEF 37.50* 30.58* City) KRGX 1074' 1 KA2459 39.18 Bakersfield 3 KGPS KQJII 2366' 39.26 Buckeye 30.58* 58 KRGX 1 KRQN 35.10* Banning 10 KQLY KQJO 2366' 7 33.22 Casa Grande 30.58' San Rafael KÁ2162 Cochise C (Bisbee) 10 KRHS 39.18 Beaumont 6 KQJH KQJP 1730* Ana 17 KQAK 37.34' 35.50* C (Los Santa Coconino C (Flagstaff) 4 KOA348 39.18 Bell 9 KPBC Los Angeles KGZO 2474 155.65 Angeles) 137 KQBV 31.90' Santa Barbara Coolidge 1 KDWD 39.18 Berkeley 100 KSW 30 KGZO 3.3.58' 37.78' 3 KERL 37.22' Douglas 4 KOA362 39.18 1 KGIH Los Banos 25 KGZO 156.33 37.10* Lynwood 1 KQJiK 35.50' Flagstaff 2 KFPX 39.90 Beverly Hills 34 KQAI 37.78 Santa Barbara C 33.18 Madera C (Madera) 14 KFWH Gilbert 1 KVXF 39.18 Blythe 2 KAPY 37.90' (Santa Barbara) 50 KQIR 156.33 6 KBMP 155.01 Manhattan Bch 3 KRIB Glendale 10 KOA205 155.25 Brawley 1613' KMA376 1561.21 3 KA2017 37.34' Marin C (San Rafael) KMA224 Santa Clara L (San Jose) Graham C (Safford) 3 KRJA 35.10* Brea 33.22 KMA233 1674 35 KMA345 156.21 47 KMA224 Santa Cruz Maricopa C (Phoenix) 22 KQXU 39.18 Burbank 1610' 39 KMA233 154.77 Mesa 4 KRIZ 39.18 Burlingame 9 KQCM 37.22' 37.38 39.38 2 KOBD 37.22' Santa Cruz C (Santa Cruz) 15 KUO r C (Kingman) 7 KSPW 39.18 Butte C (Oroville) 13 KBYQ Mariposa C (Mariposa) Mohave 155.25 4 KQKA 155.01 Santa Maria 8 KS1o1P 30.56' C 8 KICG 39.18 Calexico 5 KVRJ Martinez Navajo (Holbrook) 4 KADS 39.38 Santa Monica 44 KQDF 33.50' 1 39.18 -Sea 5 KQFI 35.22* Marysville Nogales KOA346 Carmel -by- the 35.5)' 2 KVSL 30.58' 2430* 19 KQEO 155.49 Maywood 5 KHNJ Santa Paula Phoenix KZGJ Chico 12 KRKH 39.78 25 KMA351 154.69 45 KZGJ 30.58* Chino 5 KQJ(N 33.22' Mendocino C (Ukiah) Santa Rosa 11 KQXV 33.78' lb KSRI.1 33.22 37 KOA258 39.1E Chula Vista 15 KQJG 37.34' Menlo Pk Pima C (Tucson) 2 KQJJP 37.22* 2 KCOS 33.22 12 KOA301 39.18 Claremont 2 KA2391 33.22* Merced Sausalito Final C (Florence) 37.22' 1 KQGX 31.78* 3 39.18 4 WCJO 30.58' 20 KSOM Seal Beach Prescott KNHG Coachella 10 KY LC 155.13 39.18 2 KOFK 33.50 2 KDIO 33.22 Selma Santa Cruz C (Nogales) 6 KVYN Coalinga Mill Valley 2 33.50 21 KQDQ 39.38' Shatter KUC7_ South Tucson 1 KEVZ 35.10* 1 KIHW 35.22 Modesto 154.65 ° KSYJ 39.38 Shasta C (Redding) 16 KEKII Tempe 1 KEYU 35.01* Colton 4 KQVO 33.22* Modoc 7 33.é0' KEKII 156.33 2 KEYU 39.18 Colusa 6 KQRO 39.38 Monrovia KQAG 175.73 C (Downieville) 4 KPRI 39.78 1KBZO 39.18 Compton 1 KQAQ 31.78* Montebello 20 KQFE Sierra Tolleson KRLF 1û74' Sierra Madre 10 KMA3)2 156.69 Tucson KOA255 2430* Contra Costa C (Martinez) W6XCD Monterey 33.10' 5 KRLF 35.22' Signal Hill 2 KQFU KOA255 155.01 KMA371 1658' 155.85 W6XWU 73.54 50 KRLF 156.57 15 KMA237 14 KOA255 31.78* 25 KBRV 37.02* 155.01 64 KA2968 37.34* C (Salinas) KMA393 176.33 Solano C (Fairfield) 80 KOA255 Monterey 32 KQPY 35.53' 39.18 35 Pk 5 KGKR 31.t3' South Gate . Wickenburg 1 KSMG KA2988 155.01 Monterey 9 KNCO 33.22 S. Pasadena 14 KBSP 33.22' 1 KOA225 39.18 3 KKNE 37.50 Napa Williams Corcoran 15 KPNC 155.49 S. San Francisco KMA212 1674' Winslow 4 KOA203 39.18 1 KKN5 37.78 8 KQBF 33.10 17 KMA212 39.26 Yavapai C (Prescott) KQJiM 2430* Corona 6 KRIV 30.58* National City 6 33.22' Stanislaus C (Modesto) 25 }CASE 39.36 10 KQHM 39.18 Coronado 15 KQKV 37.34' Needles KNCF 2 KORN 35.22 Stockton 80 KOCR 156.57 10 KQJIM 35.10* Corte Madera 1 KPCM 33.22 Nevada City 8 KPLN 39.76 Suisun 4 KAWL 37.02' 1 KQUEX 2430* Covina 1 KIQH 155.49 Nevada C (Nevada City) 8'KQAF 37.34' Sutter C (Yuba City) 4 KBQF 39.38 Yuma C (Yuma) 22 KADF 39.18 Culver City 12 KMA394 158.09 Newport Bch 12 KMA397 156.57 Torrance 12 KRMF 155.61 Yuma 10 KOA260 39.90 5 KILZ 35.90 N Sacramento Daly City 35.22' 4 KACO 39.38* 2 KMA213 37.02' 2 KQRV Tracy Davis 31.10 2 WPDA 30.58' EXPERIMENTAL Delano 2 KEYG 35.90* Oakland KMA301 Tulare KMA301 156.45 Tulare C (Visalia) 77 KAZF 35.10 Del Norte C (Crescent City) 15 KMYA 155.73 77 KMA301 31.78 Turlock 2 KQCG 35.38' Tucson W6XEH 73.54* Dinuba 5 KAAT 155.79 18 KMA301 156.09 Tustin 1 KQJA 33.78' Cajon 1 KEIJ 33.70' El 1 KHGV 39.50 2 KNGJ 35.10 182 KMA301 154.89 Ukiah El Centro 2490' of 2 KÁ2123 154.77 ARKANSAS 1 KQVN 2490* Oceanside KADI University Calif. 33.78' 10 KQKU 33.22* El Cerrito 20 KAMM 155.13 7 KADI Upland 7 KADI 37.34' Vaciville KMA361 2422' 1 KPBA 30.58 El Dorado C (Placerville) 4 KRZY 39.78 Blytheville 14 KQKT 33.22' 4 KMA361 37.02' 14 KPBA 37.10 El Monte 5 KROR 155.73 Ohtario 4 37.34' Vallejo 50 KGPG 155.49 5 KKZL 156.69 El Paso de Robles 3 KAGT 39.10 Orange KQBI Brinkley KGHX 2490* Ventura C (Ventura) KCFQ 2474' Camden 2 WJXY 31.50 El Segundo 11 KQJL 155.61 Orange C (Santa Ana) 49 KGHX 37.34' 88 KFOJ 30.58' Crittenden C (Marion) 6 KIOC 37.10 Elsinore 1 KGTS 30.58* July 1949 -formerly FM, and I'M RADIO -ELECTRONICS 27 MUNICIPAL it COUNTY POLICE, Cont. 64 WWPD 30.58 Burley 4 KREV WR:F 31.50 42.54 Oak Lawn 2 WIW7, 33.78 Via,,,i 10 KQBQ Caldwell 2 KEHK 42.54 Oak Park l5á.93 Coeur D'Alene 14 WQFL 37.02 Watsonville KMA340 1674' DISTRICT OF 1 KA2466 42.54 Oglesby COLUMBIA 1 WSRZ 39.50 Weed 6 KMA330 155.01 Elmore C (Mountain Home) 2 KECO 37.22 Olney Gem C (Emmett) 4 WXPZ 39.57 West Covina 1 1 KFEM KREQ 31.10 Washingtor, 113 WPDW 37.22 37.22 Ottawa 3 WQKN 37.10 Whittler 28 KGHY 155.73 Gooding C (Gooding) 6 KCJZ Park 40 WDCS 39.50 Jerome 37.22 Ridge 2 WBZD 30.70 Woodland 25 KAGD 155.85 C (Jerome) 4 KAHA 42.54 Pekin 1 WJHJ 39.50 2 WSTO 33.50 2 KCKK KAGD 1722* Washington D C Jail 5 WDPG 39.02 42.54 Peoria 30 WASE 155.91 Yreka 1 Kellogg KQGZ 30.58' 3 KHFZ 39.42 16 WASE 155.91' Yuba City 2 KBQY 39.38 Lewiston 3 KSTD 30.58 FLORIDA 1 WRIM 155.01 Yuba C (Marysville) 6 KBQZ 39.38 3 KRLG 30.58' Peoria C (Peoria) 10 WRNK Minidoka C (Rupert) 155.01 1 KRET 37.22 Peoria Hgts 5 WMWZ 155.01 EXPERIMENTAL Alachua C Moscow 6 KKMT Peru (Gainesville) 10 KIA305 155.19 39.42 1 WQKM 37.10 Baker 5 Posen C (Macclenny) 6 WRWD 155.01 KQJF 39.42 1 WRTY 33.78 Contra Costa C R W6XCD 73.59 8 Nampa 4 KQZS Quincy Bartow WBPF 155.31 155.01 4 WBHZ 155.85 Fresno W6XHU 74.14 Payette 1 R Bay C (Panama City) 5 WERE 31.10 KXRY 37.22 Riverdale WBMQ W6XHV 75.98 Belleair Pocatello 12 KRBL 33.78 1 WAJT 30.58 42.54 River Forest 3 WQIN 37.90 Glendale N W6XWC 75.56 Boca Raton Power C (American Falls) 2 KRZH 42.54 1 'WHPZ 35.90 WRIX 37.90 Grapevine M W6XGL 75.98 Bradenton 4 WRMO Twin Falls 16 KRDZ 42.54 37.10 River Grove 2 WJWS 31.50 Kettlernan R W 6X 73.22 Broward Wallace 3 KHFY IA C (Ft.Lauderdale) 10 WTXR 155.13 39.42 Riverside 2 WCEV 31.50 Long Beach N W6XWD 74.58 Clearwater 8 WQOI 150.33 Rock Falls 6 WOJQ 155.61 Los Angeles N W6XWA 74.58 Coral Gables WOCG 156.45 Rockford Los Angeles ILLINOIS 12 WPGD 155.85' R W6XKM 72.04 17 WOCG 150.45 25 WPGD Mt Tamalpals M W6XGX 155.85 75.98 17 WOCG 154.65 Rock Island 6 WBDI 155.61 Monterey R W6XHG 74.58 Dade Alexander C City 2 WPLT 30.70 (Cairo) 1 WKXZ 39.50 St Charles 3 WSTY 154.89 Orange C M W6XIJ 75.98 Dade C (Miami) 25 WQZK 154.95 Alton 6 WQ$R 37.10 Orange C R 155.01 W6XIL 75.98* Dania 2 WQXM Arlington Hgts 3 WBNQ 155.13 St Clair C (Belleville) Orange C M 37.10 10 WRMH 39.50 W6XVJ 73.18 Daytona Beach 10 KIA218 155.25 Aurora 4 WQRM 155.61 Salem 1 WAQD Pasadena N 33.94 W6XWF 74.58 Delray Bch 3 WAFD 35.90 Batavia 3 WKDV 155.01 Saline 3 WMQW Pomona N W6XWG 39.50 74.58 Dixie C (Cross City) 2 WDKX 31.10 WKDV 154.89 Schuyler C (Rushville) 4 WMUA Richmond R W6XWU 73.54 Dunedin Bedford Park 39.50 1 WBLE 30.58 9 WJVI 39.10 Scott C (Winchester) 1 Riverside R Belleville WSPK 39.50 W6XEI 73.62 Escambia C (Pensacola) 7 WPFR 31.10 8 WQTG 155.49 Shelby C (Shelbyville) 5 Riverside N WTNX 39.50 W6XWH 74. :8 Ft Lauderdale 35 WAKO Bensenville 1 KSA282 155.01 Skokie San Bernardino 155.13 2 WQXL 155.13 CM W6XVY 74.58 Fernandina 3 WKVJ 31.10 KSA282 154.89 San Diego M 3WQXL 155.13 W6XHA 75.08 Ft. Myers 15 K1A407 155.61 Berwyn 5 WSVH 33.50* Springfield 10 WQXJ San Diego N W6XVN Ft. Bloomington 156.33 74.58 Pierce 3 WFPF 35.50 10 WQRI 155.13' Stephenson C (Freeport) 4 WEGI San Jose R W6XHW 39.50 73.14 Gainesville 15 WQFC 156.03 Broadview 1 WDBL 31.50 Stickney 1 WJKW San Mateo R Gulfport 33.78 W6XHO 73.62 155.73 Brookfield 5 WEUC 31.50 Streator WQ CE 155.37 San Mateo M W6XVQ 74.38 Haines City 1 WIT W 0 35.90 Cairo 1 WIPC 39.98' 2 WAKE Santa Ana M W6XVI 74.58 Hallandale Calumet 155.61 2 'WSVE 37.10 2 WKJN 39.10 Sullivan 4 WGDY 39.50 Ventura C R W6XIB 73.62 Holly Calumet Park Hill 2 KA2364 155.25 1 WBWG 33.78' Sycamore 4 KÁ2232 39.50 Williams Hill R W6XOW Hollywood Canton 74.02 7 WQIIL 2 WHNB 37.10 Taylorville 1 WPTM Jacksonville 37.10 33.78 50 WPFG Carbondale 1 WRLI Tazewell C (Pekin) 2 WAND Jacksonville 155.67 39.50 39.50 Bch 7 WJBH Cary 1 WCVP Urbana Lakeland 30.70 39.50 10 WAGR 155.73 COLORADO 17 WPFT Centralia 2 WSKZ 39.50 Vandalia 1 WFVI Lake Worth 31.50 33.94 12 WLWP Champaign 4 WQIB Venice 1 WJAA Boulder Leesburg 156.51 155.61 39.10 5 KQGA 33.78* 3 WGPD 37.50 Chicago WPDB 1714 Vermileon C (Danville) 12 'WBWJ 39.50 Colorado Spgs 15 Leon C (Tallahassee) KPCS 31.50 2 WCGV 33.10 201 WPDC 35.22 Warren C (Monmouth) 2 WMHI Denver KGPX Miami WPFZ 39.66 2442 155.67 WPDD 1719 Washington C (Nashville) 2 WSVI 39.50 151 KGPX 37.02 75 WPFZ 155.67 103 WQJF 31.10 Wauconda 1'WNVF 33.22. El Paso C (Colorado Spgs) 5 Chicago KFHR 31.50 WPFZ 156.63 Hgts 3 W,Q,(Z 33.22 Waukegan 4 WQLM 33.22 Englewood 2 KIUE 75 Cicero 3702 WPFZ 156.63 12 WRHC 155.49 Westchester 1 WCUU 31.50 Fort Collins KAA290 Miami Bch 72 Clinton 2442 WQMA 156.03 G WMPJ 39.50 West Chicago 1 WDCR 39.66 5 KAA290 Ocala Collinsville 33.78 6 WBTW 35.90 1 WEEP 39.10 Western Springs 3 WKYZ 31.50 Grand Junction 15 KQXT Orlando 25 Crawford C (Robis_on) 37.02 WPHM 37.26 5 WRUI 39.50 West Frankfort 1 WDVQ 39.50 Greeley 7 KPDG Ormond Creve 33.78' 3 WMJI 155.67 Coeur 1 W1JGG 155.73 Wheaton 3 WQJV 39.50 Jefferson C (Golden) 36 KRSU Pahokee Crystal 39.50 3 WBNO 155.31 Lake 1 WCLV 39.50 Wheeling 2 WHEQ 33.78 La Junta 10 KPLJ Palm Bch Danville 156.33 40 KIA405 155.01 1 : WBWJ 39.50 Whiteside C (Morrison) 5 WKPC 39.50 Larimer C (Fort Collins) t Palrn Bch KAEU 33.78 C (West Palm Bch) 9 KA2777 31.10 11 KSA369 155.01 (Sterling) 4 WXED 155.73 Las Animas C (Trinidad) 2 Panama 6 Decatur KEHM 30.58 City WA-U 37.10 10 WQTF 33.10' 4WXSD 155.85 Longmont 9 KPDL Pensacola Decatur Pk 33.78 18 WRGP 155.61 Dist 1 WAAO 33.10 Will C (Joliet) 2 WJKO 39.50 Pueblo 15 Pinellas Des KQCX 30.98 2 WBIJW 33.50 Plaines WRIJ 155.13 Williamson C (Marion) 6 WUEI 39.50 KRHY 24.42 Plant City 3 4 Sterling WRFP 35.50 WRIJ 155.37 Wilmette WDEY 39.70 2 KESY 33.78 Putnam C (Palatka) 3 WKGH 4 WRIJ Winnebago Trinidad 31.10 155.13 C (Rockford) 5 WPWC 33.94 2 KHRI 30.58 Riviera Bch 4 WLRG 155.01 Dixon 3 WAGW 39.50 Winnetka 12 WQTO Quincy Dolton 155.25 156.57 WBVY 33.78' Woodford C (Eureka) 2 WBFG 39.50 5 Downers Grove CONNECTICUT WQRA 39.58 3 WRIW 37.22 Wood River 2 WQTJ 37.10 St. Augustine 4 WQ, U E. Moline 4 33.10 WEMY 156.21 Woodstock 1 E. Peoria WWPI 39.50 4 WFLI 4 WJVM 155.01 Zeigler 1 Ansonia 39.50 E. WWEV 39.50 ° WKSJ 33.10 St Lucie C (Ft Pierce) 3 WM QP 35.50 St. Louis 21 KSA317 33.10 Bethel St Edwardsville INDIANA 1 WHNK 35.90 Petersburg 30 K1A439 155.73 1 WKIJ 33.94 Bloomfield 1 WLST Sarasota Elgin 33.90' 6 WEAG 31.50 0 WQ,NO 154.89 Adams C Elmhurst (Decatur) .7. WZEP 154.89 1 KA3162 37.18' 4 WBYI 30.70 8 WQJX 154.89 Alexandria . WEDX 154.89 Branford 2 WMVO 31.10 Tallahassee 19 KIA566 33.10 155.01 Allen C (Ft Wayne) 4 WSKG 30.58 Bridgeport 23 WPFW 30.58 Tampa WFPT 37.90 Elmwood Park 3 WIEG 31.50 10 WSKG 155.85 KCA289 2466 32 WPHN 37.78 Evanston 21 WQLO Evergreen 155.61 Anderson 42 WMPI 155.61 KCA284 39.10 Vero Bch 14 WOGA 155.67 Park 1 WBKL 33.78' Angola 2 WGHM 154.89 33 KCA284 39.10 W Palm Bch 18 WRZY 35.50 Flora 3 WJLA 33.94 Bristol Winter Haven Flossmoor 2 WGHM 155.13 6 WJVO 31.10 3 WQFN 35.90 1 WEKB 33.78' Danbury Auburn 1 WAXT 155.13 3 WORE 35.90 Forest Park 2 WBXG 37.10' Bartholomew Darien C(Columbus) 1 WBBU 155.13 4 WQYB 33.78 Fox River Grove 1 WJUR GEORGIA 33.94 Bedford 2 WBIP 30.58' Derby 6 KCA298 155.49 Franklin Park 3 'WJWT 155.49 Beech Grove 1 WKBA 154.71 Easton 1 WIVR 39.10 Galesburg 3 WBYF Albany 37.10 Beverly Shores 2 WBSH 155.61 E. Hartford 8 WBXC 33.10 20 WIVJ Geneva 2 WKBP Americus 155.01 154.89 Bloomington 8 WBPD 155.13 Enfield 1 WBMW 39.10 8 KIA552 155.25 155.01 Bluffton 1 WAMI 154.89 Fairfield KCA279 Athens 3 WMUO 5 WDAA 31.10 39.50 35.50' Cass C (Logansport) 3 WSLH 154.89 11 KCA279 Atlanta KIA532 Glencoe 31.78 156.21 Clinton C (Frankfort) 2 WBTJ 154.89 Glastonbury 2 KA3167 37.18 47 KIA532 155.85 Glen Ellyn 3 WAEX 154.89, Columbia City 1 WGHQ 154.89 Greenwich 20 W 47 KIA532 Glen View 2 WGLI 39.90 156.21 37.10' 2 WBJH 155.13 47 KIA532 156.45 Granite City 4 KSA217 Groton Augusta 39.10 Columbus 3 WRJF 155.13 1 WWIWZYF 3i.9Ó 22 WQFV Harrisburg 1 WALD Hamden 31.78 39.50 Connersville 3 KSA314 154.89 13 WHPD 37.90 Bibb C (Macon) 18 WLAF Harvard 1 WHPK Hartford 155.49 39.50 Crawfordsville 3 WCIP 154.89 21 KCA330 37.18' Bullock C (Statesboro) 7 Harvey 3 WSOK WFHT 155.01 37.90' Decatur 8 WZEH Manchester 3 WRZP Brunswick Havana 154.89 33.94 12 WQTC 155.61 6 WVFZ 39.50 DeKalb C (Auburn) Meriden 5 WKSM Columbus Henderson 2 WAXU 155.13 35.10 75 WPFI 156.57 C (Oquawka) 1 WMQp 39.50 Middletown Dalton Delaware 5 WLTM 155.97 4 WSKV 155.37' 6 KIA531 37.90 Herrin 1 WDKY 39.50 East Milford Decatur Hennepin Chicago 26 WRQT 155.73 16 WBLD 31.90 15 WLAS 155.01 1 WLNY 39.50 Monroe Edinburg 1 WGGN 155.13 3 WRPC 39.10 Dougherty C (Albany) 9 WDKK Highland Park 5 WQRE New Britain 42.02 35.90 Elkhart 30 WBVH 155.85 9 WRAF 37.10 East Point 10 WBFF Highwood 1 KA3365 155.49 New Haven 35.50 Elkhart C (Goshen) 5 WSRY 155.85 KCA280 37.10 Elberton 5 WKIY Hillside 1 WBRQ 155.73 31.50 Elwood 2 WASF 154.89 40 KCA280 37.10 Floyd C (Rome) 7 WNPQ 35.90 Hinsdale 3 WROG 37.22 Homewood Evansville 67 WQICB 154.89 29 KCA280 37.78 Gainesville 2 WHNX 1 WBHY 33.78' Newington 35.50 Floyd C (New Albany) 1 WFXT 39.10 2 KA3166 37.18' Glynn C (Brunswick) 8 WQGI Jacksonville 2 WNRN 39.50 New London 155.61 Fort Wayne WHET 2490 4 WAKB 31.90 Griffin 10 WUET 3 WC UN 39.50 N Haven 155.73 64 KSA253 30.58 2 WKKD 37.78 La Grange 5 KIA454 Joliet 18 WQLW 155.13 Norwalk 155.73 110 KSA253 155.85 7 WEIS 35.50 Macon 60 WQFB 15s.21 Kankakee 4 WSTU 30.58 Franklin 1 WCQO 154.89 Norwich 3 WBXY Marietta Kenilworth 2 WKPD 39.90 3 WANT 33.94 35.90 Frankfort 8 WAKK 154.89 Plymouth 1 WHHL Richmond C (Augusta) Kewanee 7 WWHO 31.10 9 WGQ4A 35.90 154.89 Gary WAEE 155.01 Seymour 8 WMYN Rome LaGrange 2 WAFC Southington 31.50 8 WQNQ 35.90 31.50 35 WAEE 154.77 5 WOQW Savannah 28 LaGrange Park 2 WMHZ 155.01 WQTR 33.10 31.50 35 WAEE 155.01 5 KCA397 Statesboro 5 WFNP Lake Forest 7 WQLK 155.25 155.01 155.85 Gibson C (Princeton) 3 WGFA 155.85 Stamford KCA336 Thomasville 15 WROH Lansing WBMG 39.02 155.01 33.78' Goshen 5 WGON 155.85 KCA337 39.02 Toccoa 2 WHVT LaSalle 2 WQKR 39.70 Stratford 39.50 Hamilton C (Noblesville) 4 WSVP 154.89 7 WCBH Valdosta 2 WBYB Lawrenceville 1 30.98 33.50 WQGV 33.94 Hammond 18 WQYK 155.61 2 WKSC Waycross 3 WMPF 30.98 35.90 Lawrence C (Lawrenceville) 5 KA3204 39.50 Hartford 3 KSA328 155.89 WKEQ Lee C (Dixon) Suffield 30.70 7 WAGX 39.50 Henry C (New Castle) 3 WUEB 155.13 1 WCSO Libertyville Torrington 30.70 TERRITORY OF HAWAII 7 WSYW 33.22 Highland 2 KA3111 155.61 4 WKPJ Lincoln 39.90 4 WDBT 31.90 Howard C (Kokomo) 3 WBXD 155.13 Trumbull 3 WJUY 30.98 Lincolnwood 2 WSKR 37.10 3 WBXD 154.89 Wallingford 7 Hawaii C (Hilo) 'WMIR 39.90 40 KA DK 35.10 Lockport 1 'WLIJ Huntington Waterbury Honokaa 39.50 3 WAKA 30.58 37 WMPW 39.10 1 KA FR Lombard 4 Huntington C (Huntington) Watertown Honolulu 1714 KSA308 159.89 2 WSTA 30.58 1 WJYX 39.10 1 KFJD Indianapolis W Hartford 37.10 KSA308 155.13 53 KSA318 35.22 13 WQJI 31.50* 303 KGPQ 35.10 KSA308 155.37 51 KSA318 154.71 W Haven 7 WBLB Kakaako Fire Sta 155.01 KFJJ 37.10 Lyons 2 WDCV 31.50 Jasper 1 WJAI 30.70 Westport 4 WBLT Kalihl Fire Sta Wethersfield 33.94 1 KFJP 37.10 Madison 2 WMQK' 39.10 Jeffersonville 4 WMHV 39.10 3 WABT 33.10' Kaneohe Marengo Johnson WI Ili mantic KHAB 1714 1 WUAV 39.50 C (Franklin) 2 WCPN 155.13 1 WEGS 31.10 Kauai C (Lihue) 55 Marlon Windsor KCKT 37.90 1 WQHX 33.94 Knox C (Vincennes) 5 KXLV 155.13 7 KA2332 37.18 Kaunakakal 10 KRLB Markham Kokomo Woodbridge Kealakakua 30.58 1 WVKD 33.78 15 WPDT 159.89 2 WAQX 37.10 Kona KIRU 1714 Mattoon 3 WBCX 39.50 Lafayette 10 WQFQ Lanai na 154.89 KENW Maywood 4 WBZD LaPorte Lanai City 31.50 8 WMPL 154.89 KBSN Midlothian 1 Laurence C DELAWARE Oahu WJXF 33.78 (Bedford) 3 KA3374 154.89 KHAC 1714 Moline 15 KSA330 155.13 Logansport 4 W1vIPQ 154.89 Wahiawa KHAA Monmouth Madison Wailuku 1714 2 WMQ$ 39.66 C (Anderson) 4 WBMK 154.89 52 KA PM 30.58 Morton Grove 1 WSKJ Marion Wai 33.78 4 WRAY 30.58 mea 1 Mt Bridgeville 2 WLHO 39.78 KCKU 37.90 Carmel 2 WMMO 39.50 12 WSIF 154.71 Ml Dover 5 WAZO 33.50 Vernon 2 WMTV 39.50 Marshall 1 WMCJ 155.13 Mundelein 1 WAJS Michigan Milford 1 WMDM 37.50 IDAHO 33.22 11 WSVF 155.61 New Castle 2 WHEW 1 WAJS 33.22 Mishawaka 6 WSKP 154.71 39.78 Nameoki New Castle C (Wilmington) 2 KA2873 39.78 1 WMKU 39.10 Monroe C (Bloomington) 1 WBJK 155.13 Ada C (Boise) 5 KAHP 37.22 Newark 2 WNBA Naperville 1 WROA 37.50 Montgomery C 2 WBVG 154.89 39.50 Bannock C (Pocatello) 9 KAAL 42.54 Seaford Normal 1 WQJR 155.13 (Crawfordsville) 2 WXAK 39.78 Boise 10 KOA360 37.22 ,Smyrna Northbrook l'WOQH 35.90 Mt. Vernon 2 WBTY 2'WKBL 39.78 Bonneville 2 KAOA 37.22 30.70 N Chicago 2 WRLN 33.22 Muncie 25 WPGP 155.97

28 FM AND TELEVISION MUNICIPAL & COUNTY POLICE, Cont. KAHZ 31.50 Salisbury 2 WBVQ 35.50 Norwood 3 WCET 31.10 Parsons 3 KGKD 35.22 Washington C (Hagerstown) 2 WRHO 39.10 Peabody 6 KCA338 155.13 ;i Pittsburgh 20 KPGK 155.01" Phillipston 1 WEIN 31.78* Pittsfield 10 WJKH 30.58 appub, 1 '1JOIN. 155.85 Salina 18 KNGV 39.58 MASSACHUSETTS New Albany 3 WBWX 39.10 Sumner C (Wellington) 5 KTKP 39.58 Plymouth 4 WQYJ 31.90 New Castle 3 NBNC 154.89 Topeka 30 KAA420 155.73 Plymouth C (Mattapoisett) 1 WLDG 30.70 5 WBNC 155.13 KAA420 155.97 Abington i WLIH 155.73 (Pembroke) 1 WAVN 31.90 [Ioblesville 5 NKUO 154.89 Wellington 10 KUNG 39.58 Acton 1 'WITY 155.25 Quincy 30 WQgP 37.22* N Manchester 1 WIIMD 154.89 Winfield 3 KWCL 39.58 Agawam 4 KCA234 155.37 Reading 3 WQID 37.90* Peru 4 WASC 154.89 Wichita 75 KGPZ 155.13 Andover 3 WBRJ 39.10 Revere 7 KCA281 39.74* Plymouth 1 APAC 155.13 15 KWUH 37.10 Arlington 12 WPED 30.70 1714* 1 Ashland 1 WRPI 35.90 Porter C (Valparaiso) WBVT 30.58" Wyandotte C (Kansas City) 7 KQJK 156.09 Rochester 1 WRNT 37.90* 3 Princeton 2 WPNP 155.85 156.33 Athol WBJA 31.90 Rockport 1 WQYI 155.01 Putnam C (Greencastle) WHHB 35.10* Attleboro 11 WBVC 33.50 Salem 5 KCA226 39.38* Richmond 14 WPDH 33.50 KENTUCKY Auburn 1 WBNC 33.78 Salisbury 2 WHN3 37.90 15 Rush C (Rushville) 1 WJAD 154.89 Barnstable WRAQ 39.90* Saugus 3 WAYU 35.10* Rushville 2 WJAF 154.89 Ashland 12 WSAG 155.61 Barnstable C Scituate 2 WQOJ 37.10 St Joseph C (South Bend) 6 WXAJ 155.89 WSAG 155.85 (Barnstable) 1 WBPW 39.90* Sharon 8 WQSO 155.37 3 WRAR Seymour 3 WVCY 154.89 Bowling Green 4 WRIrna 30.70* 39.90 Shrewsbury 8 WBOG 37.90* 10 WRAG î9.9(l* Shelby C (Shelbyville) 2 WSTL 154.89 Corbin 5 KIA394 155.73 (Bourne) Somerset 4 WRKM 33.10 2 WEWE 39.90* Shelbyville 3 WDPS 154.89 Covington 20 W KXC 154.77 (Chatham) Somerville 17 WPEH 35.10 Beni 32 WPGI1 154.89* Danville 5 KIA509 155.13 (Falmouth) 3 WQTL 39.90* Southbridge 6 WBTV 31.10* (Barwick) 1 'WQTM 39.90* Steuben C (Angola) 3 WIUM 155.13 Fayette C (Lexington) 6 WQOB 37.10 Springfield 34 WQMD 39.38 WM UV 39.90* 154.89 Fort Thomas 8 WKNU 156.57 (Osterville) (Nantucket) 1 WBYJ 39.90* Tell Clty 1 WSNI 154.89... Frankfort 5 WKHX 155.61 `Provincetown) 1 'WMUZ 39.90* Terre Haute 15 WQOF 155.85 Glasgow 15 K[A564 39.50 MICHIGAN (Wet lfleet) 4 WLBY 39.90 Tippecanoe C (La Fayette) 2 WJNU 154.89 Harlan 5 WFON 155.13 (West Yarmouth) 3 WGBU 39.00' Tipton C (Tipton). 2 WMQI 154.89 Hazard 1 WIvIHK 39.50 WRLQ 39.93* Adrian 2 WWEJ 33.10 Valparaiso G WMPV 154.89 Henderson 2 WQTT 30.70* Bellingham 1 WBBA 37.90 Albion 2 WARZ 33.10 Vanderburgh C (Evansville) f, WBXF 30.70* Henderson C (Henderson) 12 WKK Z 30.70 Belmont 15 WRJZ 106.45 Abgonac 1 WTIQT 37.38 Vigo C (Terre Haute) 5 WNUZ 155.13 Hopkins C (Madisonville) 2 WKYP 30.70 Beverly 10 WBMP 154.77 Allegan C (Allegan) 4 WQGJ 33.10 Vincennes 3,WQ¡(T 155.13 Hopkinsville 2 WRPE 155.13 5 WECQ 155.49 Allen Park 2 WSKH 31.50 Wabash 2 WBIE 30.58* Lexington 17 WPET 39.50 Billerica Bolton 3 WKTJ 37.10 Alpena 2WQjSV 31.50 Wabash C (Wabash) 3 KA3297 154.89 100 WPDE 37.10 Louisville Boston WQIP 35.50' Ann Arbor 16 WQRK 35.10 155.13 C (London) 1 WUEW 39.90* Laurel 110 WRAS 30.98 Bad Axe 2 WQGS 33.10 Warsaw 2 WJKM 154.89 1 'WMKY 30.70* Madisonville 125 WRAS 154.69 Battle Creek 17 WRLM 33.10 Washington 1 WNKO 154.89 Mayfield 5 WRXE 155.61 1 WAGS 35.50 1 WMLU 33.10 Wayne C (Richmond) 10 KA3335 33.50 Maysville L WRPG 31.50' Braintree 5 WBUA 37.90' Bay C (Bay City) 3 WEKA 39.50 Wells C (Bluffton) ' 2 WJAK 154.89 Owensboro 13 WRPJ 30.70* Bridgewater 3 KA2938 165.73 Benton Harbor 8 WSVO 33.10 West Lafayette 2 WRMW 154.89 Paducah 5 WQIIP 30.70* Brockton G WMPB 30.93* Ben :ie 33 WKUZ 155.95 West Terre Haute 1 KA2488 155.61 Pikeville 3 KIA548 155.01 Brookline 36 WQKK 33.50' Berkley 2 WRIZ 39.38* Whiting 2 WQKD 37.10 Richmond 5 K1A247 155.01 Burlington WCAW 31.50' Birmingham 10 WRIY 155.73 Whitley C (Churubusco) 1 WDNF 154.89 Rowan 1 WKIIM 39.90 Cambridge WK NU 33.10 Bloomfield Hills C WQOG 155.73 Somerset 5 KIA292 155.01 25 KCA312 39.38 Bloomfield 5 WBBJ 155.97 Shively 1 WSYK 30.70 Carver 1 WDOF 39.58 Buchanan 1 WKWW 33.10 IOWA Winchester 10 WLHG 155.01 Chelmsford 2 WSTI 37.10 Center Line 3 WGBX 39.90 5 KCA343 37.26 Clawson Ames ` KQFW 37.10 Chelsea WRJA 39.38* Chicopee 5 WBMT 30.56* Coldwater 5 WHND 155.61 Appanoose C (Centerville) 3 KOFI 37.10 LOUISIANA Clinton 3 WQCY 37.10 Davison 1 KA2124 37.50 Boone 3 KCBI 37.10 Cohasset 3 WPGU 37.78' 1 KA2124 37.38 Burlington 8 KAA450 37.10 65 KKA613 33.22 Alexandria Concord 4 WRAC 155.25 Dearborn 80 WQND 154.77 Calhoun C (Rockwell City) l KKLJ 37.10 155.61 Danvers 2 WRAU 39.98` Detroit 161 KQA414 31.78 Carroll C (Carroll) 1 KCUA 37.10 Baton Rouge 35 KKA422 155.61 Dartmouth 6 WRJT 154.77 161 KQA414 35.22 Cass C (Atlantic) 1 KHQD 37.10 Beauregard 8 KKA541 39.50 Dedham 6 WRNU 155.61 161 KQA414 37.22 Cedar C (Tipton) 1 KFRA 37.10 Bogalusa 3 WFKK 39.55 Dracut 1 WKTK 37.10 206 K@A414 154.65 Cedar Falls 6 KESN 37.10 Bossier 8 KA3203 155.01 Danbury 1 WDBI 31.90 206 KQA414 155.85 Cedar Rapids 22 KGOZ 37.10 Cado 16 KKA387 39.50 E Bridgewater 1 WOJN 155.73 206 KQA414 156.03 Centerville 1 KKNK 37.10 Calcasieu Parish 4 KIHT 39.50 Easthampton 4 WAMT 31.78 161 KC,A414 33.78 Cerro Gordo C (Mason City) 1 KQIIY 37.10 Claiborne 5 KFDV 39.50 Everett 9 WAKF 37.78' Dowagiac 1 WJHK 33.10 Cherokee C (Cherokee) 5 KA3207 37.10 Crowley 4 KISP 155.01 25 WAKF 155.85 East Detroit 6 WAEZ 39.90 Clinton 15 KRIX 37.10 E Baton Rouge 15 WAME 39.50 Fai rhaven 2 W FMP 30.73 Ecorse 10 WQJvIH 155.49 Clinton C (Clinton) 2 KA2393 37.10 E Carroll Parish 10 KKA368 39.50 Fall River 9 WAKV 33.10 Escanaba 2 WAYA 35.90 Council BLit Ì 20 KPCB 37.10 E Feliciana 10 KKA580 39.50 Fitchburg 15 WPHA 155.61 Ferndale 8 WRJB 155.01 Crawford C (Denison) 12 KAIS 37.10 Parish 12 KKA 582 39.50 Iberia Gardner 2 WBWZ 33.94' Flint 50 WPDF 154.77 Dallas C (Adel) 1 KXRQ 37.10 Jackson Parish 7 KKAC82 39.50 Gloucester 6 WGMP 31.78' Genesee 30 WMEZ 155.85 Davenport 17 KGPN 31.78* Jefferson Parish 25 KFZR 39.50 Greenfield 6 WKQT 39.90 Grand Haven 2 WSOJ 33.78* Davis C (Bloomfield) 2 KRPS 37.10 Jennings 5 KUKL 155.01 Groton 4 WJQN 37.90 Grand Rapids 25 WPEB 33.22* Des Moines C (Burlington) 1 KHGX 37.10 Lafayette 8 ERRA 39.50 Hanson 1 WBGF 155.73 61 WPEB 33.78 Des Moines 50 KGZG 156.69 LaFayette C (Lafayette) 3 KLFII 39.50 Harvard 1 WMYK 37.10 Grosse Pointe 4 WQMT 37.10* Dubuque 20 KQDT 37.10 Lake Charles 3 KRKP 37.22' Haverhill 8 WHGF 155.85 Grosse Pte Farms 30 KQA437 155.13 Fairfield I KAMJ 37.10 La Salle Parish 5 KKA 302 39.50 Hingham 5 WQTI 37.10* KQA437 154.89 Fayette C (West Union) 5 KKVG 37.10 Madison 12 KKA270 39.50 Holbrook 4 WUWM 155.73 Grosse Pte Woods 17 WRDR 30.58* Fort Dodge 5 KQZF 37.10 Monroe 25 KKA271 155.01 1 WDMN 35.10 7 WQTD 37.90 Fort Madison 6 KBYS 33.50* Morehouse 16 KKA296 39.50 Holliston Hamtramck Holyoke 15 WAIF 156.57 Hastings 1 WAVQ 33.10 Fremont C (Sydney) 5 KAA441 37.10 Natchitoches C 7 WNPD 39.50 Hudson 8 WEHB 155.13 Hazel Park 3 WJUG 39.38* Greene C (Jefferson) 1 KCHZ 37.10 (Natchitoches) Hull 7 WQYD 37.10" Highland Park 25 KQA329 155.25 Guthrie C (Guthrie Center) 1 WRKL 37.10 New Iberia 2 KRAV 155.13 WQYE 37.10* 3 WHBM 33.10 Hamilton C (Webster City) 3 KFSC 37.10 New Orleans 22 WPEK 31.78* Holland Ipswich 2 WMJQ 37.90* Huntington Woods 3 WRJC 155.01 Hardin C (Eldora) 6 KAA449 37.10 103 WPEK 155.85 Kingston WKDX 31.90 Ingham C (Mason) 20 KQA427 155.13 Iowa City 4 KA'WP 37.10 Opelousas 12 KKA687 37.10 Lancaster 2 WKHS 37.10 5 JLVA 155.85 Iowa Falls 5 KAPO 37.10 Ouachita 10 KA2340 39.50 Ironwood Lawrence 7 WBLC 39.90' Jackson 30 WPNP 155.25 Jackson C (Maquoketa) . 1 KWGO 37.10 Plaquemines 12 WJNN 39.50 Leominster 3 WBND 33.50 10 WAMG 33.22* Keokuk 7 KRAT 37.10 Point Coupee 5 KPFP 39.50 Kalamazoo Lexington 2 WBTZ 39.90 7 WAMG 33.10 Lee C (Fort Madison) 6 KXZB 37.10 Rapides Parish 5 KHIvIL 39.50 Lincoln 1 WBOQ 155.25 WJVE 33.22' Louisa C (Wapello) 2 KAA412 37.10 Rayne 3 KKA591 155.01 Longmeadow 4 WBUI 37.22* 6 WBVU 33.10 Lucas C (Chariton) 3 KAA389 37.10 Sabine 3 KKA512 39.50 Lowell 14 WQNR 37.10' Lansing 48 WPDL 155.13 Marion 1 KA2145 37.10 St Landry 10 KXPZ 39.50 Lynn 9 WKLM 33.22 WK'WQ 2442* Marshall C (Marshalltown) 5 KMCZ 37.10 St, Tammany 7 KUMV 39.50 Lynnfield 2 WLDP 35.90 Ludington 2 WLRB 33.10 Marshalltown 2 KRHL 37.10 Shreveport KNGO 2430* 10 WSVC 33.22' 1 33.10 Mason City 7 KQAE 31.78 8 KNGP 155.01 Malden Marshall KA3008 Manchester 1 WBRT 33.94* Marysville 2 WDBM a3.10 Pleasant 1 KHOR 37.10 Vernon Parish 5 KKA537 39.50 Mt Mason WMLF 33.10 Muscatine 13 KAA407 37.10 West Monroe 6 KKA219 155.25 Mansfield 3 WAQO 33.78' Mecosta 1 WLCV 37.38 Newton 5 KJXH 37.10 Winn Parish 5 MCA 569 39.50 Marblehead 20 WBVZ 33.50' 156.33 Menominee 2 WRZQ 33.50* O'Brien C (Primghar) 3 KAA317 37.10 Midland 7 WBLA 31.50* Oelwein 2 KFLR 37.10 Stoneham 2 WRHB 31.10' 12 WBLA 155.85 Oskaloosa 15 KQJI 37.10 Stoughton 4 KAC214 155.73 MAINE 37.22 Monroe 4 WEIG 33.22 Ottumwa 17 KPDO 37.10 Taunton 6 WKTB Wakefield 7 WKWM 30.58 3 WQTB 33.22 Page C (Clarinda) 3 KCJJ 37.10 Walpole 4 WHNQ 31.10 Mt Morris 1 WHRD 37.38 Pocahontas C (Pacahontas) 1 KWIV 37.10 Auburn 4 WSAH 30.70* Waltham 8 WRNA 37.78* Mt Pleasant 1 WLEF 37.38 Polk 6 KIGR 35.22 Augusta 11 WALR 39.10 Wareham 2 WSTW 37.90* Muskegon 6 WPFC 39.38* Red Oak 3 KCFK 37.10 Bangor 6 WJTM 39.10 Watertown 8 WBNE 31.90 20 WPFC 30.58 Sac C (Sac City) 5 KAA414 37.10 Bar Harbor 25 WXTH 155.13 Wayland 1 WWPE 37.78 Muskegon C (Muskegon) 5 WBSU 39.38 Shenandoah 1 KDEN 37.10 Bath 2 WLBM 39.10 Webster. 4 KCA315 156.21 Muskegon Hgts 5 WBKD 39.38* Sloux City 13 KGPK 31.78* Brewer 1 WAQT 39.10 W Bridgewater 1 W WBM 155.73 1 WBKD 30.58 Tama C (Toledo) 2 KCJN 37.10 Brunswick 4 WECT 39.10 7 WQJG 33.78' New Baltimore 1 WBTE 39.90 Taylor C (Bedford) 5 KWNJ 37.10 Cape Elizabeth 4 WCYW 39.10 Wellesley Westfield 3 WAKW 37.90* New Haven 1 WBHW 39.90 Waterloo 10 KRMJ 37.90 Gardiner 20 KCA332 155.01 Westford 2 WBVI 37.10' Niles 6 WRQF 30.58* Webster City 5 KQZH 37.10 Houlton 4 WLDU 39.10 Westport 2 WMWP 155.37 10 WRQF 155.61 Woodbury C (Sioux City) 4 KPMF 37.10 Lewiston 7 WRQH 33.50* W 6 WFLL 39.38 10 WRQF 155.85 Old Orchard 10 KCA339 155.01 Springfield Weston 8 WITTE 33.94 Oakland C (Lake Orion) 2 WKXA 155.73 Portland 17 WPFU 39.58 Westwood 3 WKYA 31.10 (Pontiac) 20 WQRZ 155.97 KANSAS WKJD 39.58* Weymouth 5 WBVN 39.90' Oak Park 2 WDBK 35.50* Presque Isle 1 WPIN 39.10 Whitman 1 WODT 155.73 Orchard Lake 1 WOLX 155.97 Rockland 5 WJLL 155.25 C 2 31.50 Wilmington WJYI 37.90' Osceola C (Reed City) 1 WLDB 37.38 Allen (Iola) KAKP Saco 1 WMQT 39.50 10 KIHC 39.50 Winchendon 2 WJHQ 31.90 Ovid 1 WAQN 33.10 Arkansas City Sanford 16 KCA296 39.50 4 KACA 30.98* Winchester 6WQ$V 37.22 Owosso 7 WDDI 33.10 Atchison South Portland 11 WCAD 39.50 2 KGZF 33.22* Woburn 3 WAKZ 33.78* Parchment 1 WBXO 33.22* Chanute Waterville 2 WJYE 39.10 8 KGZP 39.58 Worcester 20 WPGX 33.78* Paw Paw 1 WCJI 33.10 Coffeyville Westbrook 2 WAWL 39.50 2 KA3124 39.58 Worcester C (Sterling) 2 WKMD 37.10 Pleasant Ridge 3 WRJD 155.01 Cowley C (Winfield) Winslow 1 WBAG 39.10 C 6 KRHU 155.01 Wrentham WMGT 37.90 Plymouth 5 KQA379 155.13 Crawford (Girard) York 2 WMSM 39.90 Dodge City 6 KNGH 39.58 Marion WKWS 37.90* 5 KQA379 154.89 1 Pontiac 6 155.73 Douglas C (Lawrence) G KA2375 39.58 Marlborough WRTX 39.10 WG Eldorado 3 KAA350 31.50 MARYLAND Marshfield 2 KCA251 31.90 Port Huron 8 WPGB 33.10 Rouge 5 WROQ Ellis C (Hays) 6 KAA452 39.58 Maynard 1 KCA313 155.25 River 155.49 Rochester 3 WHLY 155.73 Emporia 4 KAA433 30.98* Annapolis 2 WAMD 39.18 Medford 13 WPHG 31.78* 3 WHLY Franklin 7 KXYO 39.58 Baltimore 139 WPFH 33.22* Medway 1 WBBN 37.90 155.97 9 39.90* Garden City 15 KAA305 39.58 150 WPFH 155.85 Melrose 7 WMEJ 39.90 Roseville WRIR Methuen 9 WBGA 30.70 Royal Oak 7 WQMB 39.38* Geary C (Junction City) 1 KBXW 31.50 Calvert 2 KA3177 39.10 Great Bend 2 KBQN 30.58* Charles C (La Plata) 3 WCAI 39.10 Middleborough 4 WMAH 30.58 WBWM 35.50* Hutchinson 20 KAA240 155.25 Cumberland 5 WMEY 39.50 Middlesex C (Pepperell) 1 WFRV 37.90 3 WQVX 39.38* 31.50 Dorchester C (Cambridge) 2 WJYII 39.10 (Tewksbury) 2 WQTY 37.10* Saginaw 28 WPES 31.78* 2 WPES 31.78* 1,1 KBNW 37.10 Frederick 5 KGA247 39.98 Milton 6 WRBA 35.10* Johnson C (Olathe) 15 WRNH 155.97 Junction City 6 KAA248 39.58 Frederick C (Frederick) 1 WFMQ 39.10 Natick 3 WQJH 37.78 Kansas City 100 KQBH 156.33 Greenbelt 2 WABV 39.90 Needham 9 WMPN 33.22* St Clair 5 WSPV 33.10 156.09 Hagerstown 4 WHMD 31.10 New Bedford 7 WPFN 31.10 1 WNGF 37.38 Newburyport 1 WBMF 37.90 St Clair Shores 3 WAGP 39.90* 1 KROK 156.33 Harford 9 WMHF 37.18 4 WAGP 39.90* Labelle C (Oswego) 3 KANH 35.22 Hyattsville 2 WAOL 39.90 Newton WBSW 1714* St Joseph 4 WSQM 33.10 Lawrence 8 KAA242 39.58 Laurel WGPH 39.10 20 WPFA 31.78 Sault Ste Marie 2 WCBQ 37.90 Leavenworth 10 KNFF 155.97 Montgomery C (Rockville) 90 KGA241 37.10 Norfolk 1 WFZL 37.90 2 South Haven 7 WOGC 155.61 Manhattan 7 KRJC 30.58* Prince Georges C North Adams WQOV 37.10* 3 South Lyon 1 37.38 Marlon C (Marlon) 6 KAA288 39.58 (Upper Marlboro) 25 WJLU 39.90 Northampton WBMB 31.78 WHVI Spring Lake 1 McPherson 10 KWDG 39.58 (Cheverly) 56 KGA240 39.90 North Andover 3 NEIL 31.10 WMVF 37.38 ù Sturgis 5 WWEY 155.61 tic wt on 15 KAMH 39.58 St Mary's C (Leonardtown) 1 WICKE 39.10 N Attleborough WIEN 33.50 July 1949 formerly FM, and FM RADIO -ELECTRONICS 29 MUNICIPAL & COUNTY POLICE, Cont. Lincoln 17 KGZU 30.58 Highlands 1 WJSR 39.26 McCook 7 Surf City KAA233 155.01 Hightstowr. 1 WBGG 39.26 1 WBMX 37.18 ..ylvan La. 1 WIVE 155.97 Norfolk Teaneck KNGN 2490 Hillsdale 1 WHNG 8 WQJO 154.77 Three Riw r 3 KQA416 N Platte 155.13 Tenafly 155.61 3 KRG W 33.50 Hillside 6 3 WRGI Traverse City 5 WR1.1B Omaha WSYZ 35.50' Totowa 39.90' 155.61 30 KAA312 33.78 Hoboken 25 WMFH 156.57 3 WJKC 155.97" 5 WRMB 155.85 50 KAA312 Trenton 156.09 Hohokus 1 WSRP 30 WQ)Z 37.26 Trenton 2 WQWN 31.90 37.78' Union Beach KAA358 33.94 Interlaken 1 1 WDJQ Warren Township 4 WDNR Redwillow WAAG 39.26 Union 39.26 39.90 C (McCook) 3 KA2113 92.30 Irvington 10 'WLSN City 25 WQNY 155.61 Washtenaw C (Ann Arbor) 29 WBJG Saline C (Wilbur) 35.90 Union 35.10 1 KUWX 39.90 Jersey City 46 WQRS 7 WQJB 37.90" Wayne 48 W Saunders C (Wahoo) 31.90' Upper 30.98 2 KDBX 39.90 Penns Neck 1 KA2320 Wayne C (Flat Rock) Scottsbluff 1 'WRMJ 31.90' Ventnor 155.25 Jilzy 37.38 10 KRKV 155.01 Keansburg 2 WPKO 10 KEA315 155.73 W Bloomfield 5 WB OL Scotts Bluff C 155.37 Verona 155.97 (Gering) 10 KA2284 39.90 Kearny 13 KEA245 2 WQYH 37.90 Wyandotte 5 .VRHV 39.50 S Sioux City 39.90' Vineland 1 KQWD 31.78' Keyport 1 WDCM 5 WJED 39.10 Ypsilanti 3 WQOK York 39.26 Wall 31.78 C (York) 5 KPPS Lakewood 2 KEA268 1 WPHL 39.26 30 KQA226 155.13 39.90 37.18 Wanaque Lavallette 1 1 KA2642 37.42' 30 KQA226 154.89 KEA278 37.18 Washington NEVADA Lawrence 2 WQJN 37.26 1 WCWD 155.13 Leonia 6 KEA322 5 WSTB 35.90' Watchung 156.21 Lincoln Park 1 1 WSPE MINNESOTA Carson WRBO 31.50' Wayne 156.57 City 2 Linden 1 5 WSLC KXRL 39.38 WAJQ 31.10' Weehawken 155.97 Clark C (Las Vegas) 22 K11ER Linwood 4 KEA288 7 WKGL 31.50 Aloert Le b KQEZ 155.01 39.38 155.73 West Caldwell Elko 10 KOA229 Little Falls 4 KEA377 156.09 3 KA3304 156.33 Austin 9 KQBG 155.13 39.38 West Field 10 KQNZ Little Silver 1 WFAB 39.26 3 WQOM 33.10' Bemidji 10 KBJS 155.01 39.38 W Long Branch Fallon 2 KEUN 39.38 Livingston 6 KEA318 156.33 1 WFOV 39.26 Brainerd 1 WRJP 30.98 Las Vegas Long West Milford Cloquet 1G KGHG 155.73 Branch 3 WQNF 37.10 2 KA2641 37.42' 4 WFJC 37.10 N Las Longport 6 W New York 7 WQRN Dakot a Vegas 155.01 KEA308 155.73 37.90' 2 KPDW 33.94 Lower Penns Neck West Orange 5 WSKN Duluth 3 Ke D 154.77 5 KEA242 155.25 39.50" 23 KUFE 30.58' Reno Lyndhurst W Patterson 1 WIUO 31 KOA303 39.38 5 WSOM 155.73 Westwood 31.50' 10 KIIFE 30.58 Sparks Madison 5 WQJU 39.02 5 WRMZ 155.13 KQ2K 2382 3 KGHC 39.38 Wharton Washoe C (Reno) 9 1 WISH, 39.26 1 WEDH 33.50 Faribault 4 KQED 155.01 KK WC 39.38 Wildwood Mahwah 1 KA2843 37.18 8 WBOJ 155.01 Fairmont 10 KDEC Wildwood 156.69 Manasquan 1 WMNJ 39.26 Crest 1 WESD 155.25 Hennepin 55 KANN Woodbridge 39.90 NEW HAMPSHIRE Manville 1 WBYR 31.90' 7 WQJE 37.50' Hibbing 3 WJUI 33.50 Maplewood 6 WAPK 37.50 Woodbury 1 WRLV 31.90 International Falls 3 KSOZ 155.25 Woodcliff Lake Berlin 10 WUBK 37.50 Margate City 10 WRLY 155.73 3 WKRH 155.37 Kandiyohi 15 KAA206 31.50 Claremont Matawan Woodlynne 2 1 WKTX 1 WCBL 39.26 WPYV 156.21 Mankato b KQAA Concord 33.50 Woodridge 39.38 2 WRJV 37.90' 1 WKZB 39.26 5 KEA349 155.73 Minneapolis 77 KGPB 30.58 Dover Maywood Wyckoff 6 WKJZ 1 KCA352 37.10 5 WQMX 155.01 156.45 1 KGPB 30.98 Farmington 8 WVEZ Middlesex 1 WFZD 37.90' 35 KGPB 154.05 Hillsboro 155.25 NEW MEXICO C (liaison) 1 Middletown 2 WBXZ 39.26 Moorhead 4 KRSG 39.90 WLHB 154.77 Keene Midland Park 1 WRBX time Ulm 10 KPFJ 2 WJLR 33.50 33.50' 155.01 Laconia Milburn 8 WQKJ 37.10 Albuquerque 12 KGZX 39.18 Owatonr, 4 KOGC 154.77 2 WCOT 30.70 Artesia Manchester 25 WQLQ Milltown 1 WMNS 33.94 4 KTHZ 39.90 Ramsey 3 KQ(W 33.94. Nashua 155.97 Carlsbad Red Wìrg 10 WPHB 154.77 Millville 1 WRHR 33.94 4 KTIH 39.90 1 KQDD 33.50 Chaves C (Roswell) Portsmouth 2 WKSA Monmouth Beach 1 'WMNF 39.26 3 KA2013 33.22 Rochester 4 KQ+A1 37.10 33.50 Clcvls Rochester 2 WHIL Monmouth C (Freehold) 55 KEA317 39.26 8 KNFA 39.90 St Cloud 2 KQFY 154.65 39.50 Grant C Monroe 1 WKJE (Silver City) 10 KKA258 39.90 St Louis C (Duluth) KK1JF 155.25 30.58 Montclair 12 WQMO 156.57 Hobbs 6 KHMQ 39.90 St Paul 47 WPDS NEW JERSEY Lea C 33.94 Montvale 3 WKQL 155.37 (Lovington) 12 KSLY 39.90 Scott 10 KA2048 155.01 Quay C (Tucumcari) Montville 1 KA2647 3 KQYL 39.90 Shakopee 10 KAA355 155.01 37.42' 2 KA2103 Moorestown 3 WGI1Q 37.50' Roswell 2 KRNM 33.22 South St Paul 3 KQGR 33.94 37.10 Santa 2 WMQZ 39.90 Morristown 2 WQXK 39.10' Fe 3 KGPF 39.50 West St Paul 1 WMRV 33.94. Silver City 1 WQRO Morris 9 WFRR 155.01 6 KFAY 39.90 Winona 3 KBZB 37.78' 35.90 Psoury Pur; 9 WARM Morris C (Morristown) 50 WKYE 39.02 Tucumcari 3 KVYZ 39.90 Virginia 2 WDCX 155.61 31.50 Atlantic Cit, WLDII 33.10' Mt Ephraim 5 WXQA 155.37 Mt Hotly 1 1 WIYB 33.10' WBOD 30.70' NEW YORK MISSISSIPPI 10 WQIY 156.57 Mountainside 1 WBXE 33.50 Atlantic 1 WJZB 39.26 Neptune 3 KEA276 37.26 Audubon 8'WETQ Neptune City 1 WKKG 39.26 Albany Adams C (Natchez) 3 WAUA 31.78 155.37 31 WPFD 155.01 Avon by the S_n 1 WB$K. 39.90 Newark 100 WQIE 156.21 Amityville 2 WHDI Biloxi 3 WJJN 35.90 35.90" Bay Head 1 WIZII 37.18 New Brunswick 30 KEA379 155.61 Amsterdam 4 WKNI Cleveland 5 KKA542 155.01 37.90 Bayonne 20 WQ)(N New Milford 1 WGCS 37.90' Arcade 1 Columbus NUEL 155.13 155.49 WMLG 37.90 Beach Haven 1 New Providence 2 WGXZ 33.50 Asharoken 1 Greenville NMPG 35.90 WJXE 37.18 WTXK 39.38 Bea7hxoo.i 1 North Arlington 3 WBRZ Greenwood NSRW 155.25 WKBX 37.18 154.65 Auburn 5 WPDN 39.50 Belmar 2 WQNT North Bergen 14 WANG 31.10 Babylon Grenada - NRHF 155.01 37.10' 3 WROI 35.90' Bel ma'wr G `NKWN 155.37 North Caldwell 1 WARM! 39.10 Batavia 2 WRJS Gulfport 5 WGPP 33.50 33.50 Belleville 20 KEA388 Northfield 5 KEA300 155.73 Beacon 5 Harrison 3 WJYG 155.61 KEA346 156.21 33.50 20 North Haledon 1 WBVF 35.50' Bedford 10 Hattiesburg 3 WBJC KEA388 155.85 Hills WTUR 155.37 33.50 Bergen C (Hackensack) 22 KEA334 North Plainfield 2 WQJS 155.73 Binghamton 14 WHTZ Hinds C (Jackson) 10 KA27G0 39.18 37.10 37.90 9 KEA334 North Wildwood 3 WI!TO 156.21 Blasdell 1 Jackson 37 WAMK 39.18 37.78' KEA301 156.21' Bergenfield 4 'NRJU Nutley 4 KEA216 155.37 Broome C (Binghamton) 11 WBZN 37.90 Laurel 3 WLCP 35.90' 30.98 Bloomfield 9 NAKII Oakland 1 KA2646 37.42' Briarcliff Manor 2 WBDII Meridian 12 WJUA 35.90 37.22' 37.10' Bloomingdale 1 K1,3133 Oaklyn 1 WRMG 156.21 Bronxvllle 3 WQOY Natchez 15 NAMJ 155.31 37.42 155.49 Bogota 3 WIUA 39.50' Ocean 10 WEMD 156.57 Buffalo 50 WM7 McComb 10 WKIIV 155.25 30.58' Boonton 1 WFUA 37.90 Ocean City 4 WHTV 39.10 30 WMJ 30.58 Oktibbeha C (Starkville) 1 1(A2650 92.02 Bound Brook 2 WQ)SA 37.90' Ocean C (Tom's River) 9 WBAK. 37.18 Caledonia 1 WCNF 37.90 1 KA2o50 42.18 Bradley Beach 2 WQ11W 39.90 Oceanport 2 WCBU 39.26 Canandaigua 3 KA2450 37.90 Picayune 6 WFVO 155.25 Bridgeton 1 WSKA 31.10' Oradell 1 WGMU Cayuga C (Auburn) 20 WTCI 37.90 Vicksburg 4 WRNC 35.10 37.90' 1 WSKA 31.10 Orange 13 WQTS 155.01 Celeron 1 WRAX 37.90 B ri elle 1 WDBX 39.26 Palisades Park 1 WPPP 37.10' Cheektowaga 12 WKQZ 156.57 MISSOURI Brigantine 1 WJVN 33.10' 1 WPPP 37.10 Clarkstown 2 KA2867 37.18 Brooiclxwn 1 WRWK 155.37 Palmyra B WKPF 155.01 Colonie 10 WKDE 39.42 Burlir.gtoa 2 WBSX 37.90' Paramus 2 WBKE 37.78' Corning 3 WKPI 37.90 Cape Girardeau 1 KQBS 30.98 Butler 1 KA2648 37.42 Park Ridge 6 WKQJ Cortland 5 KEA293 39.02 Carthage 6 KCMU 155.61 156.21 Caldwell 1 WAFP 37.90 Passaic 20 WQKH Croton on Hudson 2 WRLB 37.10' Cass C (Harrisonville) 3 KAA432 154.77 155.73 Camden 25 WQNI Paterson 22 WRGO De pew 2 WDPB 37.90 Colombia 16 KQ))E 155.13 155.73 35.50' Camden C (Camden) 3 WFZG 156.21 Paulsboro 5 W NBS Dobbs Ferry 2 WVEP 155.73 Excelsior Spgs 2 KGTE 155.25 155.37 Cape May 3 WFUM 156.89 Pennsauken 3 WSPT Dunkirk 3 WALK 37.90 Hannibal 9 KQRU 155.13 39.10' Carlstadt 1 WKVZ 37.38' 10 WEPT 155.61 Dutchess C (Poughkeepsie) 15 KEA368 39.02 Independence 3 KRLK 35.90 Carteret 3 WAfJV 33.10 Penns Grove 1 WBSL Eastchester 6 WQLC 33.10 Jackson C (Independence) 14 KRHW 155.171 35.50 Cedar Grove 2 WAWX 33.10 Pequannock 1 I(A2545 East Hampton 1 WKVI 155.13 Joplin 5 KQAJ 30.58 37.42' Cinnaminson 1 WKTH Perth Amboy 5 'WFTK Easthampton 1 V1HTU 39.18 Kansas City 125 KAA359 155.61 156.69 37.90 Clark 2 WFZQ 156.31 Phillipsburg 2 WEI:X 156.09 Elmira 14 WBLL 37.90 Kirkwood 6 KXYU 155.25 Cliffside 2 WBVX Pine Beach 1 KA28"12 37.18 Endicott 20 KEA251 155.13 Ladue 6 KQOU 155.73 35.50' Clifton 20 WSQO 154.65 Piscataway 3 WQJY Ellicott 1 KA2756 37.90 Marshall 12 KAA329 39.90' 155.01 Closter 3 WRLZ Pitman 7 WAOW 155.25 Elmsford 3 KEA307 155.73 Moberly KXRS 155.61 155.01 Collingswood 5 WQNG 156.21 Plainfield 10 W.,/,,KG 156.45 Erie 8 WBTQ 37.22 Nevada 10 KSTF 155.25 Cranford 3 WQMC 155.25 Pleasantville 12 WQAIQ 155.73 Floral Park 5 KEA312 39.18' 11 Kansas City 6 KFIV 155.85 Cresski11 1 WRPR 39.90 Point Pleasant 1 WAXV 39.26 Frankfort 5 KA2084 155.61 Sedalia 5 KAA442 155.25 Deal G KEA2G2 155.01 Pompton Lakes 3 KEA291 37.42 Freeport 6 WAFR Springfield 14 37.90' KQBO 33.10 Delaware 6 KEA395 155.49 Princeton 2 WQTA 37.10' Fulton 2 WBIC Si Charles 8-KAA217 33.50' 155.49 Denville 2 WEDE 33.50 2 'NAB' 37.10' Garden City 8 WOKO St Charles C (St Charles) 2 KBMB 37.10' 39.78 Dover 4 WDHM 33.50 Prospect Park 1 WBTL 35.50' Geneva 2 WQOU 31.50 St Joseph 16 KQBW 39.10 Dumont 1 WBIJW 37.50' Rahway 8 WQYG 156.33 Glen Cove 6 WRJG 33.78' St Louis 150 KGPC 155.85 Dunellen 10 WTPM 155.13 Randolph. 1 1(113114 33.50 Glens Falls 2 WQGR 155.13 103 KSLC 155.13 E Hanover 3 KA2827 156.33 Raritan 8 WQJC 39.98 Glenville 1 WTKZ 39.50 100 KSLC 154.89 ., E Orange 18 WQKI 39.50' 1 WB NI 39.26 Gloversville WJQL 33.13 E Patterson 5 KEA301 156.69 Red Bank 6 WIEJ 39.38 Grand View on Hudson 1 KA2890 37.18 MONTANA E Rutherford 5 WLDW 155.73 Ridgefield 2 WEEP 37.50' Greenburgh 4 WQKZ 33.10 Eatontown 1 WFJV 39.20 Ridgefield Park 3 WSKM 39.50' Hanover 1 WSRX 37.90 Edgewater 4 WBOO 39.10 Ridgewood 9 'NQYF 33.50' Harrison 15 WQLX 156.33 Anaconda 2 KQHU 39.38 Elizabeth 13 WRAD 39.10' Ringwood 1 K.A2644 37.42' Hastings on Hudson 3 WKIQ 155.73 Bi Ili ngs 5 KQIZ 39.38 Emerson 1 WHBA 37.90' Riverdale 1 KA2643 37.42 Haverstraw 1 K.A316) 37.18 Butte 10 KOA278 39.82 Englewood 2 1 WBZJ 37.10' Hempstead 15 WQKP 33.511' Cascade 6 KOA21G 39.82 1 WB 37.78'IRiver Edge 3 WDYV 156.09 Herkimer 1.3'NAKN 155.37 Custer C (Miles City) 2 KGRO C 39.38 Englishtown 1 WJJE 39.20 Riverton , NIVS 155.01 Hillburn 1 KA2901 37.18 Gallatin C (Bozeman) 3 KROI 39.38 Essex Falls 3 WIHC 155.37 River Vale 1 KA2265 155.13 Hornell 5 KEA22) 37.90 Great Falls 6 Rockaway KPGF 39.38 Ewing 1 WRKY 37.26 1 WTVY 33.50 Huntington 20 VJPGO 155.61 Helena 3 KHMP 39.38' Fair Haven 1 WRXN 39.26 1 WEDQ 33.50 Ilion 10 WXCK 155.61 Kalispell 15 KGKC 39.38 Fanwood 2 WQYZ 156.45 Roseland 1 KA3120 156.33 Islip 6 WHTI 39.16 3i Clark C 1 Lewis (Helena) KTNQ 39.38' Fair Lawn 3 WCAK 37.90 Roselle 10 WQMY 156.09 Ithaca 10 KEA392 155.01 Livingston 3 KVRI 39.50 Florence 2 KEA396 155.49 RostlleRoselle Park 2 WQJQ 37.50' Jamestown 1 wavy 37.90 Miles City 2 KFMW 39.38' Florham. Park 1 WSRL 35.50 Ro 4 WQ)(Q 35.90' Johnson 11 V:MO.1 37.90 Mi ssoula 2 KQKD 39.38 Franklin Lakes 2 WNKR 156.95 Rutherford 5 KEA311 155.73 Kenmore 12'NKAS 155.13 Park C (Livingston) 2 KVRD 39.50 Fort Lee 2 WBKN 35.50 Saddle River 1 WMHT 37.78' Kings Point 3 WIHJ 39.90 Bow Silver 3 KTMH 39.82 Freehold 2 WAIL 39.26 Salem 1 WSQ)( Kingston 7 WQXP 155.61 Yellowstone 6 KA3172 39.38 Garfield 4 WRQE 39.10' Scotch Plains 2 WSPP 33.50 Lake Sueces3 2 WA1QO 37.54 Garwood 1 WGIP 155.25 Sea Bright 1 WMQC 39.26 Lakewood 1 WDCT 37.90 NEBRASKA Glassboro 1 WHNU 155.25 Sea Girt 1 WFUO 39.26 Lancaster 5 WBAW 37.90 Glen Ridge 3 WBYY 37.22 Seaside Hgts 2 WBBF 37.18 6 WLSB 37.90 Glen Rock 2 WSFB 155.73 Seaside Park 2 WCYC 37.18 Larchmont 3 WQJT 33.10' Alliance 1 KAIJB 39.90 Gloucester 4 WXAH 155.37 Secaucus 3 WQIL 37.10' Lindenhurst 4 WROJ 35.90 Beatrice 4 KSJV 39.90 1 KA2495 155.37 Shrewsbury 1 WMQF 39.26 Lockport 10 WLOC 39.50 Boys Town 5 KU WB 155.01 Guttenburg 1 WAVE 39.90 Ship Bottom 1 WKQV 33.50 1 WLOD 39.50 Cass C (Platlsmouth) 1 KSKU 39.90 Hackensack 9 WQIJ 37.50' Somerville 2 WRSO 31.10 Long Beach 5 WLBP 155.37. Chase C (Imperial) 1 KVYX 39.90 Haddon 2 WBKH 156.21 S Bound Brook i 'NBXJ 37.90' Lynbrook 5 WBDK 37.34 Colfax 2 KRLT 39.90 Haddon Heights 4 WRAN 155.37 South Belmar 1 'NBJD 39.26 Malvern 9 WGSW 155.13' Columbus 5 KQHF 39.50 Haddonfield 3 WRBJ 155.49 South Orange 4 WKVR 31.93 Mamaroneck 10 WSNK 155.25 Dodge C (Fremont) 2 KXCU 39.90 Hamilton 6 WQJM 37.26 South Plainfield 2 WABU 39.90' 1) KEA333 156.25 Fre mont 2 KCVB 39.90 Hanover 1 WLSN 39.02 South River 2 WNRF 155.97 Massena 2 WMJX 37.90 Grand 8 Island KQAV 155.01 Harrington Park 1 WFQE 155.61 Sparta 5 WSLC 155.01 Middletown 4 WSRN 155.73 Hastings 8 KRLX 39.90 Harrison 10 WXAG 158.21 Springfield 3 WBHG 39.10 Mt Vernon WQLV 35.50' Keith C (Ogallala) 5 KA2147 39.90 Hasbrouck Hgts 2 WBYX 33.10 Spring Lake Hgts WSLL 39.26 Nassau C (Mineola) 169 WPGS 37.34 Lancaster 10 KCGB 39.90 Hawthorne 2 WRGN 39.90* I Spring Lake 2 VJRAZ. 35.50' Newburgh 3 WEUA 39;90

Lincoln C (North Platte) 1 KPIJ 39.90 I Highland Park 2 WBXL 33.95 Summit 12 WQ)2X 156.57 I New Rochelle 35 KEA351 155.13

31) FM AND TELEVISION GENERAL ELECTRIC Electronics Department Offices in: Minneapolis 2, Minn. New York 22, N. Y. ELECTRONICS PARK Lake 9, Utah Atlanta 3, Ga. Boston 1, Mass. Chicago 54, III. Philadelphia 2, Pa. Salt City Cincinnati 2, Ohio Cleveland 4, Ohio Dallas San Francisco 4, Calif. Schenectady, N. Y. 2, Texas Denver 2, Colo. Detroit 26, Mich. SYRACUSE, N. Y. Seattle 4, Wash. Syracuse 1, New York Kansas City 6, Mo. Los Angeles 14, Calif. Washington 5, D. C. In Canada, Canadian General Electric Company, Ltd., Toronto, Ont. Outside the U. S. A. and Canada, by International General Electric Company, Inc., Electronics Dept., Schenectady, New York, U. S. A.

2 -WAY RADIO for time - saving communication

:.

25 -50 MC MOBILE- General Electric Mobile Combination for oper- GENERAL ELECTRIC MOBILE COMBINATION MC -201 for dependable ation in the 25 -50 me band. These combinations consist of the receiver, operation in the 152 -162 me band. Features single unit design with 30 (or 50) watt transmitter, loud speaker, microphone with retractable receiver, transmitter and power supply mounted mechanically on one cord, antenna cables, control unit, antenna, and power and control main chassis. Electrical connection is made instantly through G -E cables. Designed to withstand the grueling road -shock of day -in, special- design plug -in feature. MC -201 consists of receiver, trans- day -out operation in the oil fields. mitter, power supply, loud speaker, microphone with retractable cord, antenna, control unit, power and control cables.

GENERAL ELECTRIC 50 WATT STATION COMBINATION for use in the 25 -50 me or 152 -162 me band. Consists of 50 watt transmitter, receiver, local or remote control terminal equipment and extra space for additional re- ceivers or accessory equipment. Height, 66 inches; width, 24 inches; depth, 20 inches. Designed for "block- building" so that the simple addition of a 250 watt amplifier will boost the power output rating.

GENERAL ELECTRIC 250 WATT TRANSMITTER- RECEIVER STATION COMBINATION for the 25 -50 me or 152 -162 me bands. The cabinet con- tains a 250 watt power amplifier, 50 watt exciter, receiver, local /remote control equipment and ample space for additional receivers or accessory equipment. Height, 66 inches; width, 48 inches; depth, 20 inches.

General Electric manufactures a complete line of radio communication equipment and accessories. In addition to the combinations shown on this page, and of special interest, are a desk cabinet 50 watt station, a polemounted outdoor type G -E office or station, a portable trunk unit and a weather proof housing fcr vehicular mounting. Tor complete information, call your nearest write: General Electric Company, Transmitter Division, Electronics Park, Syracuse, New York.

July 1949 -formerly FM, and FM RADIO -ELECTRONICS 31 MUNICIPAL d COUNTY POLICE, Cont. R atherfordton 9 WATU 33.50 Mt Vernon 4 WMVK 3:.69 .regoa City Salisbury 5 WQLU 33.10 Nelsonville E KGJQ 33.53 4 WKAU 1E1.61 t-swego . : '.+ E Y'A' 39.62 Shelby 3 WANY K1AD 33.5) 37.50' Niles 4 WRQL 1;5.13 Pendleton WPEF 33.94 Statesville 2 WDBS 33.94 4 KPOL 33.50 Newark _ WQRW sa.00 Portland WPEE 33.94e Sylva 2 KA2357 37.10 Norwalk 155 KGPP 30.58' 99 KEA394 Tabor City 2 WJUM 37.9C' Polk C (Dallas) 2450 2 KA2387 39.50 Norwood 10 WBYG 155.73 30.98 Thomasville 2 WETO 39.5_ Salem 3) KOA$88 155.73 39.50 Oakwood 4 33.94 Washington 6 WDPJ WBKC 33.50" Sandy ISSAJ 33.50 35.90 Orange 2 WJZL 37.90 Sheridan 154.77' Wayne C (Goldsboro) 1 4 KNHL WJDZ 35.90 Osborn WEQS 33.5) im_;:=::? 150 KEA373 39.90 Whiteville 2 KA2388 155.85 Silverton 4 KSYM 155.73 : 39.50 Ottawa C (Port Clinton) 4 WDHW 39.66 Springfield 1 WHAT 33.94 Wilmington 17 WDPW ' KJML 39.82 155.01 Ottawa Hills 3 WQOL 11 WNYM 30.98 Wilson 10 WQI4U 155.13 31.50 Tillamook C (Tillamaoe3 3 KIKO 33.50 G. Winston Painesville 3 WKHL 37.90 Washington C (Hillsboro; (St. cc,, S 1) 29 WREN 33.94 -Salem 31 K1A397 155.25 Parma 3 KRJB 30.98 Niagara Fails 45 WNFP 37.10 8 WTAK 35.90 Wt Linn 4KHWL Pepper Pike 2 WKVK 33.50 rlissequogue 1 KA3336 156.09 37.90 West Salem 4 KSYD Perrysburg 4 WKYF W 155.73 11 Castle 3 KEA234 35.90 39.66 illamina 4 NORTH Pickaway C (Circleville) 10 KA2344 155,.85 KNHK 33.50 North P11am 4 WQLD 155.25 DAKOTA Woodburn 4 KSYQ Piqua 5 WQTP 155.73 Northport 2 WRKD 155.13 31.50 Port Clinton 4 WSTM 39.66 EXPERIMENTAL 11 'Tarrytown 1 WBXN 37.10' Bismarck 10 KAA328 39.90 Portage C (Ravenna) 4 WFRK 37.90 11 Tonawanda 14 WBTI 35.90 C Cass (Fargo) 1 KXYX Portsmouth 9 WPGI 30.58' Portland Norwi: r, 5 KEA321 155.25 39.90 2 W7XJM 73.30 Fargo 22 KNHM Ravenna 1 WRAA 37.90 Nyack. 1 KEA332 37.18 39.90 Rocky Butte W 7SJK 74.58 Grand Forks KQSO Reading 3 WCDE Troutdale cry _r,- 5 WHJC 155.55 39.90 37.90' W 7SJ L Mandan 4 Rocky River 8 WAFX 73.30 2 WQMV 37.90 KA2432 39.90 39.50 Minot 10 KAA291 39.90 Rossford 2 KQA394 154.89 3 WDQK 37.34 KQA394 155.13 4 WJAM PENNSYLVANIA 35.10 St Bernard 3 WJSB L, :x-o;ta 3 WQFJ 37.50' 30.58' OHIO Salem 5 WBGW Onondaga C 14 37.10 (Syracuse) KA2173 39.98 Sandusky 4 WAKI Abington vnt:,río C (Canandaigus) 16 WNYT 30.98 :5 KGA26) 39.18 37.90 5 WBTJJ Aldan Ürang,,town 3 KEA378 37.18 39.66 1 WJZP 39.50 Adams 2 WJQB 30.70 Seneca C (Tiffin) 4 WBNA 39.68 Allentown 25 WQJZ tasining 1 WMVE 37.10' 158.57 12 WPDO 155.97 Shaker Hgts 4 WQWN Altoona 5 Csw.-.go C (Pulaski) 20 KEA271 37.90 Akron 37.90 WSRD 35.90 Allen C (Lima) 2 WAAL 37.90 Shelby 4 WAMH 155.13 Ambridge 3 WRHZ Uyst -r By Cove 1 KA2208 35.50 37.34 4 WJUK 33.94 Sidney 6 WSGO 155.85 Aspinwall Pe-kskill 2 WBZW 31.50' Alliance Amberly 12 WBIU 155.85 Silver Lake 1 WKUJ Baldwin c WNBX 39.98 Pelham 2 WQOT 37.10' 35.90 WBIU 155.61 Solon 1 Beaver 1 37.10' 4 WDAG 155.25 WBUG 37.90 WQQB Ashland 2 WAXC 37.93 South Euclid 3 WKTW Beaver C (Beaver) 2 WJVY 30.70 PeS.s:ex Manor 5 WFJU 155.25 37.50 Ashtabula 12 WSTK 155.61 Springfield 30 156.69 Beaver Falls 4 WRHA 37.10' P1,.asantville 3 WHBP 155.37 KQA447 W STK 155.37 KQA447 154.77 Ben Avon 1 WNIB 39.38 Pi. rr.!xt 1 WRHE 37.18 20 WSIG 39.58 Steubenville 3 Berwick WKJH 37.50 Plattsburg 10 WDGS 156.33 Ashtabula C (Jefferson) WPHD 33.10' 6 KQA206 39.58 5 WPHD 154.85 Bethel 1 WAEU 39.38 Port Chester 6 WRSY 156.45' Athens 6 WJGD 155.61 Sylvania 1 WSFI 30.70 Bethlehem 4 WQJJ 0 Port Jervis 1 WQXY 155.73 Barberton .5' 6 WJGD 155.85 Tallmadge 1 Bradford :. WBRA 3733.90 Port Washington 3 WABN 156.57 WTAJ 33.66 1 WAIJW Terrace Park 1 Brentwood 1 WDED 39.38 Poughkeepsie 10 WRCV 155.13 Beachwood 37.90 KA2743 39.58 Bedford 6 WBQF 155.61 Tiffin 4 WKTP 39.66 Bristol 3 WHRL 155.25 Putvav Vly 1 WIKI 31.50 Toledo 33 WRDQ Brownsville 1 WDAH 39.10 Ramapo 3 KA2892 37.18 Bellevue 3 WBAU 39.58 35.22 Toronto 1 WRIL Butler KGA207 155.13 Rensselaer 2 WVSM 155.01 3 VBAU 39.66 33.10' Troy 3 WQTX Castle Shannon 1.WKKB 39.38 Riverhead 2 Berea 10 WTNE 155.61 37.90 WAYT 39.18 Trumbull C (Warren) Chambersburg KGA290 155.25 Rochester 76 WPDR Bexley 4 WBTR 154.65 10 WAFE 39.66 30.58' University Hgts 4 WKIK Charleroi 4 WKWY 39.50 C (New Bowling Green 12 KQA251 39.58 37.90 Rockland City) 7 KEA323 37.18 Upper Arlington 5 Chester 13 WKLC 37.50 3 WRTK 12 KQA251 39.66 WUAP 159.65 Rotterdam 35.50 Urbana Clairton 4 WQRD 155.49 Rye 12 WQKU 155.01 Brecksville 2 WMLB 37.90 2 KQA922 39.66 Van Wert C (Van Wert) 2 WBPG Clifton Hgts 1 WBRS 39.50 Salamanca 2 WBSB 37.90 Bucyrus 6 KQA229 39.59 39.78 Van Wert 4 WGEB 155.85 Coatesville 2 10 Sands Point 2 WQHZ 35.90 Canal Winchester 4 WJZA 39.58 WBRB .' Waite Hill 2 WKKU Saratoga Spgs 2 WJGB 35.90 Canton 25 WQKW 156.57 31.50' Collingdale 1 W2BEV 3933.42 Warren 9 WCBK Sarsdale 8 WQKL 155.49 Campbell 2 W t]KQ 37.22' 39.66 Colwyn 1 WXAN 37.90' Warrensville fits 4 S ^henrctady 13 WQRB 37.10 Chagrin Falls 2 WJZN 37.90 KA3307 39.90 Connellsville 5 WRFB 15539.98.13 1 WMYP Coraopolis 2 WBGJ 39.50 Champaign C (Urbana) 1 KA3144 39.58 37.90 2 WSRC Wellsville 2 WMPO Crafton 1 Scotia 2 KA3325 39.50 1 KA3144 39.66 33.10' WPMG 39.58 12 Westlake 1 WKMZ 39.38' Darby 1 WKEF Sloatsburg 1 WCUJ 31.10' Chillicothe KQA412 154.89 39.42 W P kliffe 4 WJZV Dormont 1 Smithtown 7 KEA387 156.09 Cincinnati 45 KQA387 30.58' 31.50' KA2399 39.58 Willoughby 3 WQHM Dravosburg 1 7 KEA387 156.21 160 KQA387 156.09 31.50' KA2148 156.33 Willowwick 2 WQWO 31.50' Dunmore 2 WLHK Solvay 3 WCQY 35.90 Circleville 6 KQA304 155.85 156.45 poster 8 WJST 155.61 East Lansdowne 1 WKDQ Soul nampion 8 WHTS 39.18 Clark C (Springfield) 10 KA2291 154.7T 39.50 ÿorning 2 WBYA 155.61 Easton 10 WKWA 158.69 2 WKPH 155.73 10 KA2291 156.69 Xenia 1 WEGH 33.94 Eden Park 1 KA2948 156.33 South Nyack 1 KA3251 Cleveland WEND 33.10' 37.18 Youngstown 32 WPDG 37.22' Ellwood City WKMG Sprint' Valley 2 KA3146 37.16 WRPD 33_60' 33.94 Cleveland Hgts 11 WSXO Zanesville 6 WPHO 33.22' Ephrata 1 WBHV Suffern 1 KA3149 37.18 37.50 Erie 50 KGA237 1335951...035°81 Syracuse 32 KEA207 39.79 Clyde 6 WLDO 39.66 Etna 1 WPWR 10 KEA207 39.98 Columbiana 6 KQA358 39.58 Farrell 3 WBGH 37.10 Tarrytown 3 WELL] 35.50 6 KQA358 39.66 OKLAHOMA Folcroft 1 WKKX Troy 25 WRCD 155.61 Columbus ö3 WPDI 154.65 ' Forest Hills 1 WFWZ 3937.90.38 Tu.rkahoe 5 WQJD 155.49 Cocho-ton 5 WDQH 155.85 Cuyahoga r WBUJ Fox Chapel 2 WQGD 39.38 Tuxedo Park Assoc. Inc. 1 KEA357 37.18 Falls 33.93 Ada 8 KNHC 156.69 Defiance h KQA361 155.61 Franklin 1 WB 'T 6' Upper Nyack 1 KA3370 37.18 Altus 2 KACL 30.58' Glenolden 1 WRJX 05 Utica 23 WPGJ 31.50 8 KQA361 1E5.85 Ardmore 4 KARD 33.22' 37.937.9'' Defiance C (Defiance) 2 WJES 39.78. Greensburg 3 WGRH 155.2 Warsaw 1 WMLJ 37.90 Bartlesville 5 KQFM 156.69 Greentree 1 KA2037 39. 58 Watertown 6 KEA223 37.10 Delaware 1 WHN 39.66 Blackwell 3 KEZY 33.22' Delaware C (Delaware) 2 WHNL 39.66 Hanover 3 KGA217 39.02 Watervliet 1 WMJN 37.90 Bristow 5 KOKB 30.58' Westchester East Cleveland 1) KQA214 155.13 Canadian C (El Reno) 2 KBYH 31.50 3 WFDV 155.01 C 27 WJKS 37.26 Harrisburg 13 WQOD 156.45 (White Plains) 27 WJKS 37.42 10 KQA214 154.89 Carter C (Ardmore) 5 KTQW 156.69 9 WMLC Hazelton E WUEQ 156.21 Westfield 1 East Liverpool 37.90 Chickasha dKACF 31.50 WEQK 37.90 Hollidaysburg 10 KGA232 155 .25 West Seneca 12 WSEN 155.01 Elyria 12 KQA377 31.50' Cushing 8 KAPB 1 56.69 Indiana 1 WCMF 39.38 White Plains 22 WQKS Erie C (Sandusky) 5 WALU 33.98 Duncan 2 KNGK 33.22' 37.10' 1 WREZ Euclid I1 WLSD 39.90 Durant 7 KRBK 33.22' Ingram 39.58 Yonkers 9 WPFY 37.22 Jeannette 2 WRMA 33.50' Yorktown 2 WNHO 31.50' Fairfield C (Lancaster) 3 WFPV 33.22 Edmond 2 KRHT 30.58" Fairview Park 5 KQA404 155.61 El Reno 3 KQAB 31.50 Jefferson 1 WCPE 39.38 Jenkintown 1 EXPERIMENTAL 5 KQA404 155.85 Enid 7 KKA253 33.22' KA2470 39.16 Johnstown '7 KGA223 35.53 Brookhaven Findlay 8 WUVB 155.61 Guthrie 1 KGOP 31.50 W2XML 74.50 Kingston 2 WRHW 31.10 Galion 1 WRQM 30.98 Henryeta 6 KCJM 156.69 ' Patchogue W2XMK 73.22 10 Galli poli s 10 KQA360 39.58 Kay C (Newkirk) 2 KQTV 33.22' Lancaster WQTW 37.10 Landsdowne 2 WQNB Garfield Hgts 3 WBHA 37.90 Lawton 10 KKA281 156.69 39.50 Latrobe 2 WRLH Gates Mill 2 WKWB 37.90 Logan C (Guthrie) 2 KHUO 31.50 35.90 Lebanon 5 WBMV 156.57 NORTH CAROLINA Gibsonburg 1 WGBY Miami 5 KNCE 31.50 ; 39.78 Lewistown WBXR 33.50 Girard 1 WJSD 37.22' Norman 3 KRAY 33.22' Lock Haven 1 WBSN 33.50' Grand River 1 WNZW Nowata C (Nowata) 2 KHOC 31.50 31.E0' Lower Alsase 1 KA2273 156.01 Albemarle 13 WFAQ 155.13 Grandview Hgts 8 WKTI Oklahoma City 15 KQDS 33.50 154.65 Lower Chichester 1 WKYV 37.90 Asheboro 5 WKRD Geauga C 1 Oklahoma C (Oklahoma 155.13 (Chardon) WNZE 37.90 Lower Moreland I KA2473 39.18 Asheville 13 WQMJ Greenville 1 WQZE City) 22 KGPH 33.50 39.98 37.90 Marcus Hook 5 WLDF 15315.61 Beaufort 10 Okmulgee 10 KAPF 156.69 WEHV 35.90 Hamilton C (Cincinnati) 25 KQA230 39.58 Margie 1 WBRH Pawhuska 5 KOPM, 31.50 .76' Burlington 10 WRJF. 39.98 25 KQA230 39.66 McKeesport 25 WrQJC 156.33 Canton 5 WBKG 1 Ponca City 10 KKA593 156.69 37.10 KQA231 39.58 McKees 1 WEAY Pryor 2 KCNO 31.50 Rocks 39.38 Chadbourn 2 KA2389 39.50 39.66 Meadville 4 8 KGA284 39.42 Charlotte 30 KIA565 35.90 Hardin C (Kenton) 1 WHCO 37.90 Sapulpa KPDS 30.58 Seminole 10 KKA339 156.69 Media 2 WBRX 31.78. Concord 3 WQNE 33.10' Billiards 2 WJZJ 39.58 Midland 2 WKJQ 39.98 Craven C (New 4 & 1 Shawnee 10 KWCM 156.69 Bern) KA2060 35.90 Hills Dales WRSI 156.57 _Wilbourne 1 WFIF 3 9.50 Durham 25 WDMP Hunting 4 Stillwater 10 KSWP 156.69 39.10 Valley WKUW 37.90 Millvale 1 WPWM 39.38 Durham C (Durham) 10 WUEV 39.10 Indian Hill 8 WWI- 155.85 Tulsa 12 KQEI 31.50 Milton 75 KQFI 156.69 i WCVD .50 Edentown 4 WQZE 35.90 Ironton 3 KQA330 155.61 Monaca 2 WWCC 39.9358 Elizabeth 5 WBIV 39.50 Jackson WSPX 2430' Wewoka 8 KWMP 156.69 Monessen Fayetteville 2 WQFF 39.50 13 WRO3 33.50 Jefferson C (Steubenville) 5 WWRV 33.10' Monongahela 2 WIEQ 39.50 Forsyth C (Winston -Salem) 10 WRPU 155.25 Kenton 2 WKMP 37.90 Montgomery 7b KGA243 58 Gaston C (Gastonia) 12 WMHY 37.10 Kirtland Hills 2 WKWX 31.50' OREGON 75 KGA243 3730..34 Gastonia 4 Knox C WQNZ 37.10 (Mt Vernon) 8 WAWI 39.66 Morrisville 1 WRMC 37.26 Goldsboro 4 Lakewood 11 WABQ 35.90 WHTL 37.90 Morton 1 WMGP 31.78' Granite 1 4 Falls WEVQ 37.50' Lancaster WQFO 33.22 Albany 3 KIOA 33.50 Mt. Oliver 1 WMOV 39.38 Greensboro 22 WQ1v1R 37.10' Licking 11 WHHA 39.66 Astoria 37 KQKX 156.33 Nanticoke 4 WRWT 155.49 Greenville 4 WJPT 35.30 Lima 7 WAFU 37.90 Baker 10 KSYG 158.57 Nether Providence 2 WNPP 31.76' Guilford C (Greensboro) 14 WLSG 39.50 Lisbon 3 KA2939 39.66 Bever Creek KSAD 33.50 New Castle WPGT 37.78 Lockland Henderson 6 WSQP 39.50 3 WBMZ 37.90 Bend 2 KQIN 35.22' New Kensington 3. WLDI 31.90 Hendersonville 6 WHSD 39.10 Logan I WBOH 31.50' Canby 1 KSAB 33.50 Norristown 9 WQMU 33.50 Hickory 5 WRGY 37.50' Lorain 8 WLOP 37.10 Clackamas C (Oregon City) 8 KBSX 33.50 Northampton WKHN 155.49 High Point 6 WHPP 39.50 Lyndhurst 2 WKVE 37.90 Clatsop 2 KA2680 156.33 North Versailles 1KA2159 155.61 C Iredell (Statesville) 3 WDBR 33.94 Madison 3 KQA383 39.58 Coos Bay 10 KHFX 155.01 Norwood 1 WRHY .90' Jackson C (Sylva) 6 KIA313 37.10 3 KQA389 36.66 Corvallis KFZO 33.50 O'Hara 1 WCRQ 3937U.38 Jacksonville 5 WMHU 39.10 4 WJZE 37.90 The Dalles 4 KHNX 33.50 Oil City 16 KGA227 37.90 Kings Mountain 2 WIUD Mahoning C (Youngstown) 7 WRMY 37.50' 37.22' KRWF 33.50 P arkside 1 WBJI 31.75' Kinston 6 WQLR 35.90 Mansfield 5 WQFY 37.90 Estacada 3 KEVU 33.50 Philadelphia 131 WPDP 3 98 Leaksville 2 WGNJ 39.58 Maple Heights 3 WMVH 37.90 Eugene 9 KADV 39.82 300 WIYP Lenoir 11 WBNL 37.50' Marietta 10 WRGL 39.86 Gladstone 2 KSAG 33.50 Phoenixville 2 W'QNJ 30.70 Lexington 2 WRNT 33.10 Marion 12 WJJI 39.66 Hood River 1 KOA380 155.01 Pittsburgh da WPIM .38 Lumberton 15 WKQM 39.50 2 WKUI 39.58 Klamath Falls 25 KGZH 156.57 Pleasant Hills WVKG 39.38 Mecklenburg C (Charlotte) 10 KIA473 37.90 Marion C (Marion) 10 KA2685 39.66 La Grande 4 156.57 Plymouth 4 WPPD 155.25 22 KIA488 39.98 Martins Ferry 4 KQA250 155.61 Lane C (Eugene) 3 KCSK 39.82 Pottsville 13 WJPP 156.43 Monroe. 2 WKZM 39.50 Massillon 6 WBGT 37.10' Marion C (Salem) 5 KORM 155.73 Prospect Park . WSTQ . 90' Mooresville 6 WKWO 155.13 Maumee 3 WMFS 30.70 McMinnville 12 KRLA 33.50 Punxsutawney 2 WXAM 15537.13 Mt Airy 2 WQME 35.90 Mayfield 2 KA2953 37.90 KWGK 33.50 Reading 38 WPFE 155.01 New Bern 3 WADX Mayfield 35.90 Hgts 3 WKVF 37.90 Medford 18 KRIQ 156.57 Reserve 1 WBQD 39.38 Oxford WEKH 39.38 Mentor WMOP 31.50' Milwaukee 7 KSAK 33.50 Richland 1 KA2937 39. Pitt C (Greenville) 5 WTJE 35.90 Menton on the Lake 1 WAIS 31.50' Molalla 1 KEHJ 33.50 Raleigh Ridley 2 WBKV 31.8387' 10 WQLY 31.50 Middletown 11 WBVB 35.90' Mount Angel 4 KVWM 155.73 1 Reidsville Ridley Park WABH 37.90' 2 WRPW 39.58 Montgomery C (Dayton) 15 WBAV 155.85 Multonomah C (Portland) 100 KQJR 33.98' Rose Valley : WBHE ' Roanoke Rapids 10 WPXC 35.90 Moreland Hills 2 WKVH 37.90 Newberg 3 KIYX 156.33 Ross 1 WOQG 3631.78.38 Rocky Mount 4 WQLI 33.50 Morrow C (Mt Gilead) 1 WKTR 39.78 Oak Lodge 5 KSAH 33.50 Scranton 12 WQTV 156.45

32 FM AND TELEVISION NEW FD -12 FM FREQUENCY and MODULATION MONITOR

Another first by Doolittle ONE Monitor for All FM Emergency Services!

Now you can stop worrying about a frequency change. With this one direct - reading Monitor, you can handle one, two, three or four frequencies ... or any combination up to four ... on the same or different bands ... anywhere between 25 Mc. and 170 Mc. And you can check not only frequency deviation, but also your percentage of modulation! Ideal for today's FM Emergency Services. Based on years of experience in the design and manufacture of frequency monitors, the FD -12 gives you all the features you've wanted ... in one instrument. Meets all FCC requirements. Assures utmost convenience, accuracy and reliability.

RADIO, INC.

Builders of Precision Communication Equipment 1421 South Loomis Blvd., Chicago 36, III.

33 Jul,., I949-fo1'Illerly FM . and F.V RADIO-ELECTRONICS Mitchell 1 MUNICIPAL 3 COUNTY POLICE, Cont. KQ7P 39.10 Taylor 5 KKA327 155.13 Pennington C (Rapid City) Snohomish C (Everett) 11 KSCP 2 KRTX 39.18 Temple 5 KKA646 37.18* 37.10 Sewickley Pierre 2 Spokane 25 KBTO 5 WBXP 155.13 KBKV 39.10 Terrell Hills 1 KQJB 89.42 Sewickley Rapid City 10 33.22.* 46 KGHS Hgts 3 WQIA 33.10* KNGM 39.50 Texas City 3 KTWL 33.22* 39.42 Redfield 1 25 KGHS Shaler 1 WRFY 39.38 KAA343 39.10 Tyler 8 KQCF 31.90 30.58* Shamokin 2 WKXU 155.61 Roberts C (Sisseton) 4 KAA257 39.10 University Park 13 KQZI KRLI 2414* Sharon 4 31.50* Tacoma 154 KGZN 5 WQFU 39.42 KAA257 39.18 Vernon 4 KHGZ 30.58* 158.57 Sharon Sioux 11 Thurston C (Olympia) 4 KRHM Hill 2 WC 37.90* Falls KBTY 39.10 4 KBLB 2458* 35.50 1 Vancouver 30 Sherpsburg 1 WBFH 39.38 Spink C (Redfield) KSCD 39.10 Victoria 6 KDJD KRDM 156.57 Spring Sturgis 33.50 Walla Walla 4 KWWX City WFUQ 30.58 2 KTIA 39.18 15 KEPL 33.50 Wenatchee 35.50 Springf'eh 2 WSRT 31.78* Sully C (Onida) 2 KHNK 39.10 Waco 35 KGZQ 39.42 7 KHGW 39.42 Spring Garden 2 WKVS 2 KHNK Whatcom C (Bellingham) 4 KAJS 39.90 156.57 39.18 Wàxahachie 5 KRKC 35.10 Yakima State College 1 WJZD 39.10 Vermillion 1 KROE 39.10 8 KRSI 35.50 Steelton W KQIR 35.10 5 WSPI 155.49 alworlh 3 KAZM 39.10 Westover Hills 33.10* Stowe 1 3 WEST VIRGINIA W CHX "19.38 KAZM 39.18 West Univ Place 2 KHQK 33.22* Swarthmore Watertown 1 2 WPFQ 31.78* KQJM 39.18 Wharton 9 KWSO 37.26* Tinicum 1 WBOI 31.78* Yankton 3 39.18 Beckley KQXR 1 KWSO 37.26 2 WKHK 35.50 Trainer 1 WDLC Yankton C (Yankton) 2 KUQG Bluefield 37.90 39.18 1 KA2315 37.26 3 WBWV 33.10 Uniontown 2 WQTN 39.10 Wichita lb KGZI 30.58* Charleston 11 WPHI 39.60 Upper Chichester 1 WKYU 37.90 Clarksburg Williamson 1 KA2494 42.90 10 KQA349 155.37 Upper Darby 12 WGBJ 156.57 Dunbar 1 TENNESSEE Yoakum 1 KPRQ 33.50 WJQA 37.90 Upper Dublin 2 KA2471 39.18 Fairmont 10 WPHJ 155.13 Upper Moreland 1 KA2472 39.18 Follansbee Alcoa 2 WNLF 33.50 1 WSLE 33.10* Upper Providence 1 WBLP 31.78* Belle Meade 25 KIA233 Hancock C Warren b WENZ 155.13 37.26 UTAH (New Cumberland) Bristol 1 WHTW 37.90 BWEIR 39.98 Washington 2 WKYR 39.50 Chattanooga Huntington 21 WQOW 39.50 Waynesboro 35 WRCK 37.10 Ogden 8 KQCH 30.58 2 WIUY 33.50* Clarksville 3 WGTQ Keyser 6 WAEF 37.90 West Chester 4 WQNV 33.10 155.01 Provo 9 KPMU 155.01 Martinsburg Cleveland 2 WNOS 37.26 12 KQA370 37.18 West Deer 1 WDKV 39.38 Salt Lake City 58 KGPW 30.58* Morgantown Columbia 4 WDDV 37.26 7 WJWZ 35.90 W Goshen 1 WBQE 33.10 15 KGPW 155.01 Parkersburg Dyer C (Dyersburg) 1 WKXI 8 WPHQ 37.90 West Mifflin 2 39.38 Springville 1 KRWA 35.78 WMII 39.58 Dyersburg 4 KIA385 Princeton 1 WSTH 31.50* West View 1 WTQD 39.38 South 39.38 Gallatin 10 WEBG Charleston 8 WUFS 155.13 Whitehall 2 37.26 WBWT 39.38 Greenville 5 W Weirton 4 WFGG 39.98 Wilkes Barr, 15 WQFM 156.09 NTH 37.26 Wellsburg Jackson 7 WRSJ 31.50 VERMONT 1 WRIN 33.10* Wilkirst:r - 6 KGA239 156.57 Johnson City Wheeling 10 KQA335 155.01 Willia 3 WPGZ 35.10 Williamson 15 WQOH 156.45 Knoxville 15 WKHJ Brattleboro 5 WBQG 33.50 1 WCWF 37.90 Wyomi. 1 KA2959 155.01 155.01 Burlington Lawrenceburg 5 KIA376 5 WRCW 155.37 Yeadon 5 WRLO 39.42 155.25 Rutland WISCONSIN Lexington 5 KIA321 2 WBMI 39.10 York 6 WAKX 156.33 155.25 Springfield 4 WIUF Maryville 2 WNPO 33.50 39.10 Maury C (Columbia) 10 WEAA 37.26 Baraboo 1 WKLG 31.50* PUERTO RICO Memphis 77 WPEC 30.58* VIRGINIA Barron C (Barron) 3 KSA329 39.42 Murfreesboro 13 WEBT 37.26 Beaver Dam 2 WSTG 31.50* Nashville 51 KIA231 37.10 Beloit 12 WRNI 37.26* Aguadilla 1 WSJP 155.13 Paris 2 WBTB 37.10* Alexandria 16 WAVA 31.10 Blooming Grove 1 WBVE 39.58 1 WNKS Arecibo 1 WSJH 155.13 Springfield 6 WTWR 155.25 Appomattox C (Appomattox) 1 WNKV 47.20 Brodhead 39.58 1 WTYV 37.90 Bayamon 1 WSJ) 155.13 Union City 1 WRI.X 37.9)* Arlington 10 WPAV 33.50 Burlington 1 WJAQ 39.58 Caguas 1 WSJK 155.13 Washington C (Jonesboro) 5 WMLA 155.61 Augusta C (Staunton) 2 WKUG 37.90 Cedarburg Culebra WSJE 155.13 Bedford C (Bedford) 2 WBCL 42.70* Chilton 7 W KLU 33.50* Guyama l WSJG 155.13 Bristol 2 WPHV 37.90 Chippewa Falls 4 KSA257 39.58 Humacao 1 WSJF 155.13 TEXAS Caroline C (Bowling Green) 2 WDVL 42.70 Clark C (Neillsville) 9 KSA348 39.66 Mayaguez W LHP 155.13 Charlotte C (Court House) WEKC 39.39 Chenequa 3 WGUX 154.89 WQTE Columbia C (Portage) WHIX 31.50* WSJL 155.13 Abilene 14 KA DR 30.98* Charlottesville 10 39.50 Chesterfield 20 WMSO 39.50 Crawford C Ponce WSJB 155.13 ligts 1 KQZW 33.22* Alamo Colonial 4 (Prairie du Chien) 12 KSA206 39.42 Puerto Rico, Govt. 1 KIRF 155.13 4 KQDH 30.58* Hts WAVP 39.50 Amarillo 6 12 KSA206 39.34 San Juan 1 WSJO 155.13 10 37.22* Danville WRGU 33.10 Angelina KHFW 13 WTNR WSJC 155.13 102 KKA484 155.61 Dinwiddie C ( Dinwiddie) 3 WMWJ 42.70 Dane C (Madison) 39.58 Austin De Pere 3 WHNP 37.90 Vieques WSJD 155.13 Beaumont 50 KGPJ 37.22 Fairfax 8 WMFC 35.90 37.22* Franklin 10 WENW 155.13 Dodgeville 8 WKPY 39.66 35 KGPJ Douglas 6 WDTO 30.58 3 KA3190 37.18 Falls Church 2 WHCN 35.90 RHODE ISLAND Bell C (Belton) Eagle River 4 WOAZ 37.90 Bexar C (San Antonio) 24 KPBT 33.22* Frederick C (Winchester) 3 KA2682 37.18 Fredericksburg 2 WRQG 39.82 Eau Claire 10 WBHT 39.34 Big Spring 2 KACM 33.22* 10 WBHU 39.42 3 30.58* Hampton 2 WELH 33.10* Barrington 6 WSNE 155.49 Borger KG CV Hanover Edgerton 2 WFXQ 39.42 C (Bryan) 4 KCFV 37.10 5 WCAQ 42.70 Central Falls 3 WKAA 39.38* Brazos Hear km 30 WEUG 156.09 Elkhorn 12 WMPE 30.58* Cranston WPGK C (Brownwood) h KAGJ 24.58* 20 155.97 Brown Hopewell 2 WQOZ 37.10* 6 WMPE 37.78 Cumberland 4 KCA261 156.45 Brownwood 4 KNGW 30:58* James City 1 WAQJ 33.10 Evansville WSUB 31.50* E Providence 16 Brownsville 7 KGHT 35.10* WPEI 33.22* Lexington 8 WMKO 39.80 Fond Du Lac 30 WFDW 39.34 1 20 KPBR 37.10 Middletown WVFX 155.73 Bryan Lynchburg 12 WQFH 35.10 Forest C (Crandon) 3 KSA313 39.42 Newport Cameron C (Brownsville) 9 KOGA 35.10* 8 WMPH 155.73 Marion 2 WKME 3 KSA313 39.34 N 1 KHIU 35.50 39.50 Kingston 8 WNHZ 37.10 Carthage Martinsville 4 WHTJ Fort Atkinson 1 WRLP 39.42 N Providence Chorokee C (Rusk) 8 KKA590 37.26 39.10 3 WRKF 155.85 Nansernond 2 WFRU 39.50 Grafton 1 WKIW 37.78 3 KCA235 156.45 Cleburne 4 KNGE 35.10* New Green Bay 18 WHNO 37.90 18 KGHV 33.22* Kent C (New Kent) 1 WTNF 35.78 Pawtucket 9 WPFV 39.38* Corpus Christi Newport 12 5 KNHB 1 ,22* 5 KRGA 30.98* News WRIV 35.90* Providence 100 WPGF 155.85 Corsicana Norfolk 46 WQNK Green Lake 2 WJLH 39.66 Cuero 3 KLFQ 35.50 37.10* Warwick 35 WSYV 154.89 Orange C (Orange) 2 WBSJ 92.70 Jamesville 6 WRNQ 39.42 Westerly lo WCZC 155.85 Dallas 72 KVP 33.22* Jefferson 3 WRAJ 37.78 KVPA 1714* Patrick C (Stuart) 2 KA3357 42.70 Woonsocket 6 WPEM 35.10 Petersburg '/ Juneau 3 WJUL 39.58 Dallas C (Dallas) 11 KRMB 33.22* wer 39.50 Portsmouth 26 WPVL 37.90 3 WJUL 39.66 EXPERIMENTAL Denison 10 KQAT 31.50* George Kohler 3 WQZJ 33.50* Denton 8 KKA614 37.10* Prince C (Prince George) 6 WVDA 39.50 LaCrosse WSLM 31.50* Providence 45 W1XVI 154.57 El Campo 3 KÁ2975 37.26 Pulaski Lake Geneva WQRJ 30.58* Electra 3 KPDE 2458* 2 WDGL 39.50 Radford 4 WTMY 39.50 Madison 20 WASD 39.26 El Paso 5 KGZM 33.10* 1 WSVY 37.78 40 KGZM 154.65* Richmond 126 WPHF 156.09 SOUTH CAROLINA Roanoke 45 WQFG 1 WBQC 37.78 El Paso C (El Paso) 8 KR11V 33.10* 155.13 Rockingham 3 WMMG 37.90 Manitowoc 11 WBSY 33.50* 1 KAAV 35.10 Ennis Salem WCTG Maple Bluff 1 WRNF 39.58 Aiken 3 WRXP 39.50 Fort Worth 71 KQAN 37.14* 20 39.50 5 WSQF 39.50 Marshfield 3 WBGN 31.90* Anderson 3 WRJQ 37.50* KRLJ 33.10* Marinette 2 WALF 37.10* Charleston WCPD 2430* Scott C (Gate City) 2 KA3375 42.70 Freeport 5 KSME 37.261, S Norfolk 2 WHTG 155.13 10 WBAJ 37.90 Chester 5 WJSU 155.25 12 Gainesville KADM 30.58* Stafford C (Stafford) 3 KA2902 38.82 Menomonie 2 WDBH 39.42 Chester C (Chester) 10 WJVF 155.25 Galena Park 2 KBZQ 35.50 Milwaukee 186 WPDK 33.78 Clinton 4 WCQW 155.73 Staunton 7 WRID 37.90 Galveston 18 KRPW 33.22* Minocqua 1 KA2877 39.42 Columbia 14 WCMP 39.35 Suffolk 5 WRGV 39.50 5 KGCT 33.22* Monona 1 WSWH 37.78 Darlington 3 KA2487 39.98 Vinton 3 KA2167 155.13 Gladewater 1 KBYN 33.22* Mosinee 1 WNJE 31.90* Florence 7 KIA244 37.50 Virginia Beach 9 WADB 33.94 Grande Prairie KISE 39.10 Waynesboro 2 WIGV 37.90 Oconto 9 WPEV 37.90 Fort Mill 5 WGXB 156.69 Grayson 5 KFXL 39.10 Oshkosh 5 WCJR 30.58* Greenville 35 WQLG 155.25 Williamsburg 2 WKYT 33.10 Greenville 15 KIFH 39.50 Winchester 6 KIA408 37.18 Peshtigo 1 WPWL 39.58 16 WPGR 37.10 Gregg C 3 (Longview) 25 KKA463 37.26 York C (Yorktown) 1 WRWJ 42.70 Platteville KSA276 39.42 Greenwood 25 WSVQ 155.13 Hardin C (Kountze) 2 KKA224 37.18 3 KSA276 39.34 Hartsville 3 KIA388 39.98 Harlingen 10 KXDJ 155.61 Plymouth 1 WKOL 33.50* Lancaster 6 WIAT 35.50 Harrison C (Marshall) 6 KSVII 37.26 WASHINGTON Portage 1 WAGH 39.66 Laurens 12 WOMU 155.73 Hempstead 15 KRLS 37.26 6 WELA 31.50* Laurens C (Laurens) 15 WONH 155.73 Henderson 6 KDLV 35.10 Port Washington 2 WRJL 39.58 Orangeburg 10 WJQC 155.13 Highland Park 7 KQGS 37.10* Aberdeen 20 KGZV 155.73 Racine 8 WQLJ 39.58 Rock Hill 10 KIA357 39.10 Houston 25 KHTP 156.03 Anacortes 5 KAEB 35.50 Racine C (Racine) 6 WRNP 39.66 Spartanburg C (Spartanburg) 20 WBPB 35.90 1 1 KHPR 1714* Asotin 1 KBSM Rhinelander KA2918 39.42 Spartanburg 10 30.58 WSSC 35.90 Howard C (Big Spring) KFEA 33.22* Bellingham 28 KACK 39.90 Shawano C (Shawano) 12 WGNF 39.42 Sumter 3 WLAH 33.10 Hunt C (Greenville) 4 KKA367 39.50 Bremerton 30 Sheboygan 5 WQMW 33.50* Unior. 15 WKQW 155.01 KOA353 33.50 Kendall C (Boerne) 1 KA2496 .9 Burlington 2 Sheboygan C (Sheboygan) 6 WBOA 33.60* York 11 KIA468 39.10 KTFJ 35.50 Kilgore 4 KKPD 3342.220 " Camas 10 KREB 155.01 Shorewood Hills 1 WCKO 39.66 Kingsville 10 KKA264 37.26 Centralia 4 KGHW 35.50 St Croix 7 KSA315 39.42 Lamar C (Paris) 6 KTUY 155.25 Chehalis 10 KOA254 155.01 7 KSA315 39.34 SOUTH DAKOTA Laredo 25 KYNL 39.10 Clark C (Vancouver) 8 KRDL 30.58* Stevens 3 WRNG 31.50* Liberty 10 KRVT 37.18 Clarkstdn KHBX 30.58* Stoughton 1 WDBD 39.66 Aberdeen 2 KAWC 39.10 Longview 8 KACU 31.78* Colfax 1 KQKC 30.58* Superior 6 WSWE 30.58* . 1 Belle Fourche 2 KXYM 39.10 Lubbock 9 KGZW 33.2237.22** Ellensburg 2 KBGR 35.50 Tomahawk WTAV 37.90 Beresford 2 KAOW 39.18 Lufkin 5 KQAN Everett 22 KNFP 37.10 Two Rivers 2 WDCJ 33.50* Brookings 2KQEJ 39.10 Marshall 12 KADT 39.38 Grays Harbor C Vilas C (Eagle River) 4 KSA312 39.42 Brookings C (Brookings) 3 KUMD 39.18 2 KADT 39.38* (Montesano) 13 KOA398 38.82 Waukesha 8 WQML 155.13 Brown C (Aberdeen) 2 KRQA 39.10 McAllen 13 KBQI 155.13 Hoquiam 4 KAPL 30.58* 25 WMPD 155.13* Waupaca 18 WFQF 39.34 Charles Mix C (Lake Andes) 2 KVWI 39.18 McKinney 8 KTWP 37.22* King C (Seattle) 34 KAXT . 37.78 Clay C (Vermillion) 1 KVML 39.18 McLennan C (Waco) 10 KRVH 39.42 Kelso 15 KBJA 156.21 Waushara C (Wautoma) 2 WCKT 39,66 Codington C (Watertown) 4 KJXP 39.18 Mexia 3 KOXW 33.22* 20 KQEQ 156.21 West Allis 20 WGSO 155.61 Custer 3 KA3110 39.18 Midland 12 KKA662 37.18 Kennewick 10 KOA399 35.50 West Bend 2 WJAJ 37.78 W hitewáter 3 WHPH 39.42 Davison C (Mitchell) 1 KGLK 39.18 Midlothian 1 KRPJ Klickitat C (Goldendale) 10 KOA294 35.50 35.10 Winnebago Day C (Webster) 2 KRID 39.18 Nacogdoches 1 KRAN 37.22* Lewis C (Chehalis) 12 KQWA 35.50 28 WAKE 39.34 Deadwood 1 KBPR 39.18 Nueces 4KA3189 37.18 Longview 20 KSLB 156.21 Wisconsin Rapids 2 WNRG 31.90* Deuel 4 KUON 39.10 Odessa 25 KKA490 37.18 Morse Creek KRXY 39.74 Wood C 4 KUON 39.18 Olmos Park KOTP 33.22* Mount Vernon 7 KCNR 35.50 (Wisconsin Rapids) 10 WJZH 31.9Q* Elk Point 3 KDCQ 39.10 Orange 7 KEZU 37.22* Oak Harbor 1 KOGX 37.50 EXPERIMENTAL Fall River 2 KXQK 39.18 Palestine 5 KXGJ 155.25 Olympia 5 KACE 35.50 Faulkton 2 KXOY 39.10 Panola C (Carthage) 2 KRSY 35.60 Pacific C (S Bend) 10 KOA397 39.82 Cedarville W9XXJ 73.22 Grant C (Milbank) 2 KAVY 39.18 Pampa 3 KPAM 30.58* Pasco 2 KIBS 35.50 Gregory C (Burke) 2 KSTY 39.18 Paris 6 KQKM 155.25 Port Angeles 18 KPAP 39.74 Hanson C (Alexandria) 1 KAMW 39.10 Pasadena 3 KPPD 33.22* Port Orchard 14 KADL 33.50 WYOMING Hot Springs 1 KWAR 39.10 Plainview 1 KRKQ 2458* Port Townsend 1 KQEC 30.58* Huron 2 KVPB 39.10 Port Arthur 8 KPAT 37.22* Pullman 3 KQVP 39.42 Kingsbury 1 KCIA 39.10 Refugio C (Refugio) 7 KKA390 37.18 Puyallup 2 KPWP 35.90 Casper 4 KGAC 33.22* Lake Andes 2 KVUF 39.18 Rosenburg 15 KRTP 37.26 Ritzville 2 KRAU 30.58* Cheyenne 11 KQOI 33.22* Lawrence C (Deadwood) 5 KAA408 39.10 San Angelo 15 KKA398 37.22 Renton 12 KGLß 35.50 Laramie C (Heyenne) 3 KZ 33.22* 5 KAA408 39.18 San Antonio 70 KGZE * Seattle 430 KAFO 37.78 Laramie 3 KRTQ 33.22* Madison 2 KHFT 39.18 Sherman 6 KVUW 3933.22.10 54 KATH 37.78 Rawlins KEYII 33.22* McIntosh 2 KUOR 39.18 Smith C (Tyler) 7 KA2910 37.26 Shelton 2 MICE 35.50 Rock Springs . 1 KEYI 33.22* Minnehaha 2 KXAB 39.18 Sweetwater 5 KKA348 39.10 2 KHLD 35.50 Sheridan 2 KEYS 33.22*

34 FM AND TELEVISION Browning Frequency Meters Are Standard

Equipment for k II Communications Services

Model S -4: Calibrated at any Model S -7: 1 or 2 points, 72 to 1 to 5 points, 1.5 to 70 mc. 76 and /or 152 to 162 mc. Crystal-controlled frequency meter, For systems operating on either or hand -calibrated to an accuracy of both of the bands indicated. Hand - .0025%, as required by FCC, so easy calibrated to an accuracy of .0025% to use that any fixed or mobile trans- as required by FCC. Similar in design mitter can be checked in 60 seconds. and ease of operation to the model S -4. Rugged construction will withstand Built -in, regulated power supply op- years of use. Built -in, regulated power erates on 110 -115 volts, AC or DC. Will supply for 110 -115 volts, AC or DC. keep your system at peak efficiency.

BROWNING Frequency Meters conform to the new FCC Rules effective July 1, 1949. These meters can be ordered from the manufacturer supplying your initial mobile radio installation. Or, if you prefer, place your order with your local distributor. In either case, insist upon the accuracy and convenience of a BROWNING meter.

Model S -5: 1, 2, or 3 points between 30 and 500 mc. Accuracy of .0025% maintained by temperature -controlled crystal and tem- perature- compensated electron- coupled oscillator. Transmitter signals can be checked with a receiver to which the meter is coupled. Can be supplied on rack panel 8 3/4 by 19 ins. Operates on 105 -115 volts AC.

IMPORTANT: The accuracy of any BROWNING frequency meter can be checked in the field against WWV standard frequency signals because the crystal frequencies employed are sub -multiples of WWV. This essential feature is not found in other communications -type meters. NOTE : Use the BROWNING WWV Calibrator for precision checking.

BROWNING LABORATORIES, Inc. 750 Mass. B R N I N G Main St., Winchester, O W prices on the following LABORATORIES, INC. Please send me technical details and WINCHESTER, MASS. Browning precision products: S -4 Frequency Meter S -7 Frequency Meter S -5 Frequency Meter WWV Frequency Calibrator

IN CANADA, ADDRESS: Name Arnprior, Ont. Measurement Engineering, Ltd., Address EXPORT SALES Company Connection 9 ROCKEFELLER PLAZA, Room 1422 NEW YORK 20, U. S. A. July 1949 -formerly FM, and FM RADIO -ELECTRONICS STATE POLICE 182 WJXD 31.10 EXPERIMENTAL Bartow WKSO 31.10 East Tawas KQA271 37.50 Chipley 42.58 ALABAMA W LIU 31.10 Colby R WXDJ 73.30 Erie Crestview 1 KIA285 31.10 Council Grove KQA262 37.50 Montgomery Cross City W9XIB 75.98 42.58 Hq WRBU 37.50 WJSK 31.10 Garnett R WXDI 73.30 175 KA2108 37.50 Deland WJJX Great Escanaba WRRC 37.50 31.10 Bend R WXDL 73.30 Ewen 37.38 Florida, State of 202 KA2773 31.10 Hutchinson N WDSO 37.50 Fort Myers WXDC 74.58 Flat Rock KQA266 37.50 4 'WQJ(B 37.50 WSPF 31.10 McLouth W9XIC 75.98 Anniston Jacksonville WJXJ 31.10 Norton N 42.58 WKVG 37.50 Lake WXDM 74.58 Flint KQA273 37.50 Birmingham WLBA 37.50 City W KDR 31.10 Pratt R WXDK 73.30 Blakely Island WKSQ 37.50 Miami WSWP 41.10 Stockton R WXDN 42.58 Ocala 73.30 Gaylord KQA292 37.50 Decatur WKSD 37.50 WJXI 31.10 Topeka WXCE 73.98 Demopolis Pahokee WRSF 31.10 Wheaton W9XIE 42.58 W KSK 37.50 Palatka 75.98 Gladstone KQA300 37.50 Dothan WKXR 37.50 WSWY 31.10 Wichita R WXDO 73.30 Evergreen Pensacola WSWR 31.10 42.58 KIA310 37.50 Tampa Gladwln WBXA 37.50 Florence WQ]íF 37.50 WKGZ 31.10 KENTUCKY Grand West Palm Beach WSYU 31.10 Haven KQA289 37.50 Gadsden WKSG 37.50 42.58 Frankfort Hq WMLI 39.90 Grove Hill WSQY 37.50 GEORGIA Houghton Lake KQA294 37.50 Hamilton KIA360 37.50 WQWY 39.90 42.58 Huntsville Bowling Green 39.90 WKSP 37.50 Atlanta Hq WGSP 1666* Elizabethtown 1642* Opelika WQfG 37.50 Albany 39.90 Imlay City WRXY 37.50 Selma WSIK 1666* Hazard WKBG 39.90 Iron Mountain WKSJ 37.50 WS1K 92.02 London KQA301 37.50 Tuscaloosa WHTX 37.50 Gainesville WKBF 39.90 42.58 WGRN 1666* Madisonvill, WKYM 39.90 Jackson EXPERIMENTAL Griffin WSIN 1666* Mayfield KQA275 37.50 Madison WHIG 39.90 42.58 WCEZ 42.02 Morehead VJKPE 39.90 Jonesville Newman WVCZ 42.02 KQA279 37.50 Dothan W4XWM 74.50 Perry 42.58 Newton WHIK 42.02 LOUISIANA Keego Harbor W4XWO 73.22 WKPG KQA269 37.50 1666* 42.58 ARIZONA Reidsville WSIJ 1666* Baton Rouge Hq WLSP 1682* Lansing Toccoa WHGO 554 KA2255 1642* 92.02 WLSP 30.50 KA2255 37.50 Phoenix Hq Thomaston WWWM 42.02 92 KA2746 39.50 KLEE 39.18 Thomson WJCG 42.02 KA2255 37.38 KOA292 1698* Alexandria KRAD 1682* KA2255 42.58 Valdosta KIA242 42.02 KRAD 39.18 Villa Rica WVRA 39.50 KA2255 42.74 24 KA2542 42.02 Franklin KSPF 1682* KQA256 35.10* Washington WSIO 1666* 1642* 85 KA2542 39.18 KSPF 39.50 37.50 WSIO 42.02 Hammond KA2542 39.26 Waycross WHIX WEKK 39.50 42.58 Ehrenberg KFHA 42.02 La Place WNJB 39.50 Manistee KQA296 37.50 39.18 Lake Tucson KOA391 39.18 IDAHO Charles KSPB 1682* 42.58 KSPB 39.50 Manistique KQA299 37.50 EXPERIMENTAL Boise Hq Leesville KSPL 1682* 42.58 KFEO 42.54 Mio WBKZ Boise KOA368 KSPL 39.50 37.50 Phoenix W 7X 42.54 Louisiana, State of Mount Pleasant KQA288 37.50 IS 75.98 Most Teller KOA300 42.54 KKA386 39.50 Yavapai C W7XEF 73.62 1682* 42.58 Monroe Muskegon ILLINOIS KSPC 1682* WBYK 37.50 ARKANSAS KSPC 39.50 New Buffalo KQA284 37.50 New Orleans WNHI 42.58 S¡rivf5l: Hy 1610* 39.50 Little Rock Hq RASP 1722* Ruston KIHL 39.50 Newberry KQA298 37.50 1 Wy 1610* 75 KAOB 35.78 Shreveport KKA 720 1682 42.58 I WQPX 1610* Niles KQA283 1 KHAD 1722* 39.50 37.50 Clarksville 1 WQPZ 1610* 42.58 KFDL 1722 1 WQPQ 1610* El Dorado KQSR 1722* MAINE Palmer KQA297 37.50 1 WQPV 1610* Forrest City KFDK 1722* 42.58 1 WQPI 1610* Augusta Hq WBNV 39.90 Paw Paw KQA 281 37.50 Harrison. KW BQ. 1722* 488 WSTE Hope 42.50 231 WSYD 39.90 33.10 KEZX 1722* Blue Island WQPB 42.50 Houlton Newport KBSL 1722* Chicago WGSL 39.90 92.58 Warren WQPC 155.37* WLDQ 39.90 Plainwell WIXD 37.50 KFD.) 1'722* DuQuoln WQPD 1610* Reed City East St Louis Lucerne -in -Maine KCA277 39.90 KQA287 37.50 CALIFORNIA WQPJ 1610* Skowhegan WGIO 39.90 42.58 Effingham WQPF 1610* Thomaston Rockford Elgin WSTR 39.90 KQA286 33.10 WQPE 42.50 Waterboro WEAH 39.90 37.50 Sacramento Hq KAAS 1690* Joliet WQPO 42.50 KADJ 1690* Macomb 42.58 WQPM 1610* EXPERIMENTAL Romeo KQA262 37.50 685 KAPA 39.78 Peoria WQPL 1610* 42.58 2 KGI1W 1690* Pontiac WQPP 1610* Hill Roscommon Alturas KHNW Castle R W 1XIF 73.30 WIVA 37.50 1690* Rock Island WQPR 42.50 Houlton N St. Clair Bakersfield KADC 1682* Springfield W1XJF 74.58 KQA264 37.50 Californfa,State KSA213 1610* Waterboro W'1XDR 73.30 42.58 of 1 KA3235 39.38 Sterling WQPG 1610 Wells St. Ignace Cedar Springs Camp KMA336 1682* W 1XDT 74.58 KQA259 37,50 Urbana W'QPH 42.50 West Scarboro W Chino KSCC 39.90 1XDU 74.58 42.58 Los Angeles Sandusky KQA268 37.50 KAWF 1682* EXPERIMENTAL MARYLAND 42.58 Newhall KQUI 1682 Sault Ste Marie Nevada City KAPI 1693* W,._IC 37.50 Beverly R W9XJK 74.14 Annapolis Ho ..^ Sheboygan KQA291 37.50 Oak Glen KFPE 1682* KA2097 39.10 Oakland Fairmont R W9XFM 74.14 KA2097 39.18 42.58 KRBU 1690* Goreville R W3XPM 74.14 Belair South Haven KQA285 Oroville KPDF 1690* WEVN 39.10 37.50 Marseilles R W 9XNS 74.14 College Park. Pomona KQUG 1682* WWCP 39.10 42.58 Redding Mill Shoals WOXPL 74.14 Conowingo WMSH 39.10 Traverse City KQA290 37.50 KCIR 1690* Mt Olive R W9XIIU Cumberland Represa KSRF 74.14 WMEB 39.10 42.58 39.90 Seward R W9XNT 74.14 Easton WMSE 39.10 Wakefield KQA295 San Luis Obispo KQDO 1682* 37.50 Springfield Hagerstown 1 WMQU 39.10 San Quentin KSQP W'9XSW 42.50 42.58 39.90 Warrensburg R W9XAW 74.14 High Knob WMSF 39.10 West Branch KQA274 37.50 Stockton KXPIJ 1690* Vallejo Woodstock R W9XNR 74.14 Randallstown WMSR 39.10 42.58 KHNY 1690 Salisbury WWSG 39.10 White Pigeon KQA282 37.50 Ventura KIUF 1682* Willows INDIANA Waterloo `ti'll'JJI: 39.10 42.58 KASG 1690* Ypsilanti KQA267 37.50 Yerba Buena Island 23 KKJW 156.69 fndianapo'. 6:. 11 1 MASSACHUSETTS 42.58 Yreka KSCY 1690* WPHE 1634* 1 WAHO 1634* EXPERIMENTAL Boston Hq EXPERIMEI 4TAL 1 WAHQ 1634* 208 WEGI 35.90 1 WAHR 1634 WKFA 35.90 Detroit KQA23 75.98 Bridgewater Bloomer Ml 1 WARP 1634* WKGC 35.90 Lansing KQA22 73.18 WeXJC 74.50 Marquette N Blue Canyon 1 WRSH 1634* WPEL 35.90 W8XFS 73.14 W6XH 73.22 Framingham WMP 35.90 Okemos KQA21 75.98 Corona W6XAR 72.26 284 KA2181 35.78 75 KA2161 42.26 Nantucket WSPN 35.90 Palmer W8XFR 75.98 Kern W 6X IE 74.14 Northampton 1 KA2181 1634* WKFI 35.90 Los Angeles W6XWB 74.58* Charleston WPEW 35.90 MINNESOTA Lyons Peak W6XHL 74.19 WBMO 1634* Chesterton WPHS 1634* Oak Bluffs WSPO 35.90 Mt Pierce W 6XJB 74.19 Connorsville Pt Holden WSQL 35.90 Minnesota, State of 90 KA2742 42.66 San WBII 1634* Marcos Pass W6XHM 74.14 Indianapolis WPHE 42.82 Sacred Oak Peak W 6X IK 74.14 1634* EXPERIMENTAL Jasper WPHU 1634* Redwood Falls KNHD 1658* Santa Clara C WBXFY 74.50 Ligonier 42.82 Santa Paula W6XHI WQFW 155.37 74.14 Pendleton WRNR Adams R WAWT 154.65 St Paul WAMV 42.82 S Fork Mt W 6XXD 79.14 1634* Putnamvllle WQGB 1634* Holden N W BUN 156.69 State Park W6XHJ 74.14 Seymour Princeton R WBVW 154.65 MISSISSIPPI Strawberry Peak WBXHK 74.14 WQFE 1634* West Lafayette WROR 1634* Twp 27 nr Klaus Mine MICHIGAN Jackson Hq WRJI 42.02 San Luis Obispo C W6XIC 74.14 EXPERIMENTAL 151 WJBE 42.02 Lansing Hq 554 KA2255 1642* Batesville WJBF 42.02 COLORADO Hartford City W9XQG 74.58 KA2255 37.50 Brookhaven WKGK 42.02 KA2255 37.38 Greenwood WJBD 42.02 Denver Hq KDPY 156.69 KA2255 42.58 Gulfport WJBG 42.02 1 KRAK 33.78* IOWA KA2255 42.74 Hattiesburg WMHP 42.02 KGSP 92.46 KQA256 1642* Meridian WNRJ 42.02 191 KQKY 42.46* 37.50 New Albany WJBN 42.02 Grand Junction KAA437 42.46 Des Moines Hq 171 KADW 35.78 42.58 Starkville WJBJ 42.02 Idaho S; -rL., KL )E 154.77 1 KADW 1682* Allegan WDfD 37.50 KGHO 1682* Alpena KQA293 37.50 EXPERIMENTAL CONNECTICUT 4 KRPA 35.78* 42.58 Atlantic KA CD 1682 Atlanta W BRD 37.50 Brookhaven N W 5X LN 74.58 Hartford H:{ 345 WCSE 39.50 Helmond KOBA 73.42 Bad Axe KQA272 37.50 Meadville R W 5X LM 73.30 Bethany WJTI 39.50 Burlington KAA 46 73.42 42.58 Canaan WJTB 39.50 Cedar Falls KNFN 1682* Baldwin WDAI 37.50 MISSOURI Colchester WJTK 39.50 Essex KRPE 73.42 Battle Creek KQA280 37.50 Croton WJTE 39.50 Fairfield KACC 1682* 42.58 Jefferson City Hq KHPF 42.06 Danielson WJTD 39.50 Ladora KNGI 73.42 Hartford Bay City KQA270 37.50 1674* W JTH 39.50 Maquoketa KCMW 37.10 33.10 363 K1IPJ 42.22 Litchfield WJTJ 39.50 Ossian KAA97 73.42 Kirkwood Ridgefield 42.SÁ KHPC 42.06 WJTA 39.50 Storm Lake KNFO 1682* Blissfield KQA278 40.58 1674* Stafford Sprues WJTC 39.50 Lee's Summit KHPA 42.06 Westbrook KCA223 39.5) 37.50 Westport KANSAS Boyne City WDAQ 37.50 1674* WJTG 39.50 Brighton KQA261 37.50 Macon KHPB 42.06 42.58 1674* DELAWARE Topeka Hq 1 KANI 42.46 Cadillac KQA260 37.50 Poplar Bluff KHPE 42.06 KBGE 42.46 42.58 1674* Dover Hq WJRF 39.50 KBGF 42.46 Center' ine KQA265 37.50 St Joseph MPH 42.06 90 WJIH 39.78 121 KRXE 42.46 42.58 Springfield KHPD 42.06 Bellefonte WAFF 39.50 42.30 Clinton KQA276 37.50 1674* Bridgeville KGA283 39.50 Chanute KAQB 42.46 42.58 Willow Springs KHPG 42.06 Georgetown WAYY 39.50 Hutchinson KAHR 42.46 Crystal Falls WSWK 37.50 New Castle WDSP 39.50 KCJI 42.46 Detroit KQA2tl'2 37.50 EXPERIMENTAL Garden City KHSN '42.48 42.58 FLORIDA Norton KJAD 42.46 East Lansing KQS258 37.50 Carthage R W9XGL 75.98 Tallahassee KJPR 42.48 33.10 Ft Leonard Wood R W9XGD 75.98 Hq WKTF 31.10 Salina KHNS 42.46 Hannibal R W9XHU 74.58 3 WKGJ 42.58 31.10 Wheaton KBGD 42.46 1642* Jefferson City R WXAN 42.06

36 FM AND TEI.E\':S1f)N Specialists in MOBILE RADIO ENGINEERING

Whether your problem is in meeting the stringent new requirements of the F.C.C. for mobile services . . . establishing a new VHF station in one of the mobile radio networks now being formed . . . Alliance Ten- or providing 100% satisfaction to your na-Rotor illus- trated withAm- customers for VHF communications over phenol114- large coverage areas . . . 005 antenna.

OUR ENGINEERING GROUP,* WITH MORE THAN 10 YEARS' SUCCESSFUL EXPERIENCE IN THE MOBILE RADIO FIELD, CAN BE OF SERVICE TO YOU...

VHF and induction radio systems for gov- ermental, industrial, common carrier services- satelite and remote control sys- tems-multiplex equipment for FM and TV stations-network planning. Where TV broadcasting stations are at wide Communications Research angles from point of reception and re- orienta- CORPORATION tion of the antenna is required to maximize 250 Park Avenue, New York 17, N. Y. each station, Amphenol television antennas * W. S. Halstead & Associates provide the greatest gain by virtue of the in- Tel. PL 3 -2635 line high and low band folded dipoles which beam in a clean, narrow directional pattern. The high front -to -side and front -to -back ratios FOR not only provide maximum signal pickup in POLICE CALLS *- FM * v LI C ALA TAXI CABS the exact desired direction, but also secure AND OT ERS against any interference from an unwanted direction. Radio Receiver Tunes Durable, sturdy, aluminum construction Emergency Communications withstands high wind and ice loading com- bined. Band ... 152 -162 Megacycles Install Amphenol in single bay or stacked NEW IMPROVED MODEL PR -7 array. True F.M. superhetrodyne, 6 miniature tubes, in- cluding rectifier. 110 volts, AC -DC, 5 -inch highest quality components. speaker, 1.1. owe Imo Ie moo mom mow Attached Antenna Illustrated at left is the standard Am- Clear Vision dial phenol television antenna shown in * Size 10%" x 6%" x 6" stacked array (Model 114 -302) for ' Discriminator detector added db gain in fringe areas . . . or each bay may be individually oriented.

LIST PRICE includes excise tax, Model 114 -005 at right is the F.O.B. Indianapolis. $10. cash with standard Amphenol All -Channel order, balance C.O.D. TV Antenna with brilliant re- Also available Model PR -30 for 30 -44 megacycles $4495 ception on all channels in both band bands.

See 30m.. DEALER first, or write 'Dept. FM-1. ti RADIO APPARATUS CORP. 303 FOUNTAIN SQUARE THEATER BLDG- AMERICAN PHENOLIC CORPORATION CHICAGO 50, ILLINOIS INDIANAPOLIS 3, INDIANA 1830 SO. 54TH AVENUE

July 1949 -formerly FM, and FM RADIO -ELECTRONICS 37 STATE Newcomb POLICE, Cont. 2 WNQX 42.14 Dalesville WQSH 42.82 Oneonta t WNWV 42.14 Dushore WTSS UTAH Kingdom City KAA314 42.06 Painted Post WNHU 42.19 42.62 Kirkwooi Easton WTLT 42.82 KAA203 42.06 Port Henry WNHL 42.14 Ebensburg WPJX 42.62 Salt Lake City Hq KUHP 1874' Lees Suc:tr.i! KAA202 42.06 Riverhead WNWC 42.14 234 Macon Emporium WQSE 42.82 KA2018 42.78 KAA201 42.06 Saranac Lake WNHG 42.14 Erie WPNA 42.62 42.94 North Kansas City KAA405 42.06 Sidney 2 WNHX 42.14 Brigham City 1 KBUO Poplar Bluff Solvay Franklin WPMU 42.62 42.94 KAA270 42.06 WNHA 42.14 Gettysburg WQSG 42.62 Logan 1 KHQW 42.94 Potosi R- W9XGE 75.98 S Glen 2 WNQJ.4 Falls 42.14 Greensburg WHNI 42.62 Oe 1 KUSH 1674* St Joseph KAA204 42.06 Stark 2 WNRC 42.14 Troy Hamburg WOVK 42.62 1 KUSH 42.94 Springfield KAA243 42.06 WNWG 42.14 Hazelton WTNL 42.82 Provo KOA283 1874* Willow Springs WXJK 73.14 WGFW 42.14 Hollidaysburg 49.94 Vestal WNPM 42.14 WNTK 42.62 Honesdale WTTA 42.62 VERMONT MONTANA Wellsville WNQF 42.14 Huntingdon WPMW 42.62 Westfield WNHW 42.14 Imperial WPOA 42.62 Helena Hq 3J KRNW 39.38* W urtsboro WUYU 42.14 Indiana WPML 42.82 Montpelier Hq 150 WJYB 42.88 2 KRNW 39.50 Indiantown Gap WTKK 42.62 42.70 10 KRNW 39.82 EXPERIMENTAL Kane WTIQ 42.62 Brattleboro WLID 73.22 Kittanning Burke WJYC 42.88 Albany Hq WTIX 42.62 NEBRASKA 42 W2XPG 42.14 Lancaster KGA220 42.62 Mt Olga WLTQ 74.50 Lebannon Rutland WKWZ 73.22 Lincoln Hq NORTH WDLL 42.62 Sherburne KAXD 42.46 CAROLINA Lehighton WTNW 42.82 WKOD 74.50 105 KREP 42.46 Lewiston WJYD 42.86 Raleigh Hq WANN WPNX 42.62 Gering KRXW 42.46 42.62 Lock Haven WQSI 42.62 Stowe W JYH 42.88 Grand Island KAA430 42.46 615 WIUK 92.78 Lykens Wilmington WJYO 42.86 Blowing Rock WQSA 42.62 Holdrege KHNP 42.46 KIA377 42.62 Mansfield WTJQ 42.62 McCook KHNN 42.46 Elizabeth WANL 42.62 McConnellsburg WPNT 92.82 EXPERIMENTAL Norfolk KHIS 92.46 Elizabeth City WFGX 42.62 Mercer WTQT 42.62 North Platt. KHNB 42.46 Halifax WLTI 42.62 Burke Kernersville Milford WOVM 42.62 W1XRM 74.50 Omaha KBJY 42.46 WKJT 42.62 Milton WNTA 42.62 Burlington W1XRP 73.22 Oshkosh KRXN 42.46 Salisbury WANK 42.62 Montoursville Montpelier W1XRQ 73.22 Swannanoa WNTZ 42.62 WAND 42.62 Mt Pocono WTNH 42.62 Mt Mansfield W1XR0 74.50 NEVADA WKVL 42.62 New Castle WTPB 42.82 St Johnsbury WI_XRN 73.22 W illiainston WANI 42.62 New Milford Carson WPJT 42.62 City Hq KODH 1634e Philadelphia WNTN 92.62 VIRGINIA 2 KRGL 39.38e EXPERIMENTAL Pine Grove WOVS 42.62 12 KRGL 39.78 Pleasant Gap WNTF 42.62 Richmond Hg . 'JJRJJ 35.50 Reno KRNP 1634e Asheville R W4XTK 74.50 Punxsutawney WNSI 42.62 35.78 Swannanoa N 2 W4XTN 73.34 Quakertown WTLU 42.62 42.70 NEW HAMPSHIRE W4XWX 74.58 Reading WKPP 42.62 42.88 Waynesville R W4XTO 74.60 Ridgway WPNU 42.62 1 WPXE 42.86 Con..oru Hq WMOE 33.50 Rochester WTJJ 42.62 Appomattox WRIF 42.86 WRPT 1682e OHIO Schuylkill Haven WPKX 42.62 Chesterfield C WSPH 42.86 WAJA 1682e Shickshinny WTRO 42.62 Culpeper C WHIG 42.86 92 WJJF 37.38 Columbus Hq WPGQ 39.10e Somerset Norfolk WAEY 4.2.86 WTJZ 42.62 Wytheville EXPERIMENTAL 1 WDCW 1730* Stroudsburg WTTC 42.62 WBXQ 42.86 6 WFHO 39.10 Towanda WTKF 42.62 306 KA2351 39.78 Tunkhannock WTRL 42.62 EXPERIMENTAL Sarg. -nt's Purchase W IXCD 75.98 Athens WOZy 39.10 Uniontown Warner R 'N1XUD WTJP 42.62 75.08 Bellefontaine WPIJ 39.10 Warren WNSY 42.62 Culpeper N W3XZL 74.50 Bellevue Washington Montgomery C W3XVY 73.22 NEW JERSEY W OH O 39.10 WNTE 42.62 Bridgeport WLSZ 39.10 Waynesburg WTPJ 42.62 Norfolk W4XQ,4 94.50 Cambridge WPHT W. Spring-field Rappahannock C W4XAC 73.22 Tre mop. Hq 39.10* WTTB 42.62 KA2785 1610* Chillicothe WWCL 39.10 Wyoming WPAJ 42.62 Warwick C W4XQB 73.22 KA2785 37.42* Dayton WODH 39.10 York WQSB 42.82 Wise C KIA26 73.30 000 KA2785 39.78 Defianceaí nce WJJAV 39.10 Wythe C KIA25 74.42 Findlay WPGG 39.10* RHODE ISLAND Wytheville W3XZJ 74.50 EXPERIMENTAL Gallipolis WCD( 39.10 WASHINGTON Geneva WLSW 39.10 Providence Hq WKXW 39.78 Absecon W3XTI 27.925 Georgetown WCIV North Scituate Andover W3XTN 39.10 WRSA 42.62 37.925 Hebron WCIU 39.10 Richmond WKQI 42.62 Tacoma Hq Y 37.50 Berlin W3XTK 37.925 Kent WWCJ 39.10 K¿JY 2490* Cape May CH W3XTG 27.925 Lancaster 35J WJAH 39.10 SOUTH KHMZ 2490' Elwood W3XTJ 27.925 Lima WWCN 39.10 CAROLINA KHMZ 37.50 Flanders W3XTO 27.925 Lorain Bellingham KNFK 2490' Flemington WOUG 39.10 W3XTS 27.925 Mansfield WLSV 39.10 Columbia Hq 3 WKLD 42.10 KNFK 37.50 Freehold W2XZS 27.925 Marietta WCGN 39.10 W0 WKBY 42.10 Bremerton KQZT 37.50 Hightstown W3XTT 27.925 Marion WOGN 39.10 W KBY 42.26 Chehalis KLFE 37.50 Keyport W2XZU 27.025 Massillon WPHC 39.10e Anderson KIA232 42.10 Ellensburg KNFX 37.50 Malmo W3XTL 27.925 Medina KQA446 39.10 Charleston WJJH 42.10 Hoquiam KBPY 37.50 Mantua W2XAH 27.925 Middletown WOUB 39.10 Conway WFYI 42.10 Kelso KBKK 37.50 Mays Landing W2XIU 27.925 Mt Vernon W1tF0 Florence WSRU 42.10 Mt Vernon KLEZ 37.50 39.10 Olympia Morristown W3XTQ 27.025 New Philadelphia WWCK 39.10 Greenville W CQF 42.10 KNFG 2490' New Brunswick. W3XTX 27.925 Perrysburg WODX 39.10 Orangeburg, WBAF 42.10 KNFG 37.50 Port Norris W3XTH 27.925 Portsmouth WHNT 39.10 Spartenburg WJJP 42.10 Port Angeles KRGS ' 37.50 Seattle ' Ramsey W2XZQ 27.925 Salem WOEX 39.10 Sumter WKEW 42.10 KOA389 2490' Riverton W3XTW 27.925 Springfield Walterboro 1 WDYQ 37.50 KQA352 39.10 42.10 Snoqualmie Sotch Plains W2XZR 27.925 Troy WTOH 39.10 Summit KOA238 2490* Somerville W3XTR 27.925 Van Wert WPFF 39.10 SOUTH DAKOTA 37.50 Springfield W3XTU 27.925 Warren WBGQ 39.10 Spokane KNGR 2490* Toms River W2XZT 27.925 Wilmington Pierre liq KAVX 39.10 KNGR 37.50 WPHK 39.10* Tacoma Trenton 1 W2XCK 27.925 W intersvllle KQA350 39.10 135 KSDK 39.10 KQJY 2490* W3XTV 27.925 Wooster KQJY 37.50 'N J E E 39.10 KAA453 39.10 Vancouver W 1 OXQR 27.925 KSDP 39.10 KOA345 2490* KpA345 W 1 OXQS 27.925 OK LAHOMA Custer State Park KURM 39.10 37.50 W JOXQT 27.925 Huron Wenatchee KNGQ 37.50 KRBW 39.10 Yakima W I OXRT 27.925 Oklahoma City Hq KOSO 1626' KSDH KNOB 2490* 39.10 KNOB 37.50 W 1 OXRU 27.925 KOSR 1626* Kimball KRBE 39.10 KEA289 2455* 129 KONJ 35.78* Parker KSDA 39.10 WEST VIRGINIA Tuckorton W2XZP Claremore 27.925 KOSU 1626' Rapid City KSDG 39.10 Charleston Hq 142 WBSQ, 42.26 Washington W3X'TP 27.925 Clinton KOSX 1626* KSDL 39.10 Woodstown Coalgate Barboursville WKQS 42.10 W3XTM 27.925 KOSC 1626* 1 KSLL 39.10 Beckley WBSP 42.10 Lawton KOSY 1626' KRPD 39.10 NEW McAlester Webster Elkins WSPL 42.10 MEXICO KOSW 1626* KSDW 39.10 Morgantown WSWO 42.10 Pawnee KOSP 1626* Santa Fe liq EXPERIMENTAL Moundsville WM WV 42.10 KCQA 39.90 Tulsa KKA514 1626* Parkersburg KQA359 42.10 46 KCQB 39.78 Arlington Romney WRMP 1626' 6 KC 39.90 OREGON R WXCW 73.22 WRMP 42.10 Albuquerque KMXR 39.90 Custer R W9XSL 79.00 Cloudcroft Shinnston WSWV 42.10 KUBJ 39.90 Salem Hq KOHS 1706* Deadwood R W9XSJ 79.00 South Charleston WPWV 1628' 31 KOHF 1706* Faith R WXDB 73.22 WPWV 42.10 EXPERIMENTAL 10 KOHF 30.98* Gettysburg R WXCZ 73.22 Stollings WDKE 42.10 200 KOHF 42.94 Huron N WXDA 74.50 WSLT 42.10 A l am ogordo KUBK 75.90 KOA381 1706' Pierre R WXCX 73.22 Sutton WUIQ 42.10 Albuquerque W Astoria KOHA Pierre N , 5XHY 79.00 1706' WXFR 74.50 Weirton 1 WDSF 42.10 Cloudcroft KUBL 72.18 Baker KOS383 1706* Rapid City N WXQH 81.06 Sante F. W5XHZ 81.00 Bend KOHN 1706* N9XSI 81.00 EXPERIMENTAL Burns KOHU 1706* JJXCY 74.50 NEW YORK CoQuille KOHC 1706* Beckley W8XFW 75.98 Eugene KOHE 1706* TENNESSEE Blair Mountain W8XCP 73.62 Gov Camp KOHI 1706* Elkins W8XFY 75.98 Albany lig 33.WFLJ 42.30 Grants Pass KONG 1706* Nashville Hq 260 KA2856 42.26* Kanawha C W8XDD 73.62 459 WNEH 42.14 John Day KOHO 1706* 42.42 Keeney Mountain W8XFX 73.82 WNEH 42.30 Klamath Falls KOHK 1706* 1 WNUW 1618* Middle Point W8XPV 73.62 WNGS 42.14 La Grande KOHL 1706* KIA472 42.42 Moundsville R W8X0 73.62 Allegany WNHV 42.14 Medford KOHQ 1706* Chattanooga WJBV 1618* Moundsville N W8XOD 75.98 Athol Sf.rings WNGU 42.14 Odell Lake KOA296 1706* Huntington WEBD 1618 Mountain View WBXDF 73.82 Auburn WNHR 42.14 Ontario KOA384 1706* Jordonia WBVM 1618' Romney R W8XSH 73.62 Babylon WKRI 42.14 Pendleton KOA382 1706* Kingsport WEOM 42.42 Romney N W8XSI 75.98 Batavia WNQG 42.14 Portland KOHM 1706* Knoxville WKVT 1618* South Carleston W8XDE 74.58 Bernren WNQY 42.14 Roseburg KOI{R 1706' Memphis WDBW 1618* Stollings .VBXCQ 74.58 Bliss WNHV 42.14 Santiam KOHJ 1706* Brightwaters WNWO 42.14 The Dalles KOA293 1706* EXPERIMENTAL WISCONSIN Canandaigua WNQK 42.14 Catskill WNWS 42.14 PENNSYLVANIA Humboldt R 1 W4XTL 73.98 Madison Ng WIZR 42.38 Dutnesburg WNHM 42.14 Rockwood W4XTH 73.98 121 WDAU 42.38 Hq East Avon WNIO 42.14 Harrisburg 200 WPAZ 42.82 St Andrews W4XTM 73.98 2 WDAU 31.50* East Islip WKRN 42.14 200 WPAZ 42.78 Black River Falls VBZG 42.38 Ferndale WAHU 42.14 WPSP 42.62 TEXAS DePere WGLK 42.38 WNJJX 42.14 Athens WTQV 42.62 Greenfield 1 WCJA 42.38 Fonda WNJW 42.14 Avondale WTTD 92.62 Austin Hq KTXA 1658' Hayward WDAZ 42.38 Hawthorne WNDV 42.14 Bedford WNSH 42.62 1 KTXB 1658* Menominie WQWA. 42.38 Herring KEA236 42.14 Belle Vernon WTQB 42.62 1 KTXH 1658* Tomahawk WEBH 42.38 WNHP 92.14 Blakely WNSG 42.82 1 KTXR 1658* Highland WNBO 42.19 Bloomsburg WQSC 42.62 332 KA2686 1658' EXPERIMENTAL Homer WNGW 42.14 Brodheadsville WTPI 92.62 42.90 Horseheads WNHY 42.14 Butler WPVK 42.82 Arlington KTXF 1658' Alma WQUZ 74.50 Jones Beach WHIRL 42.14 Carlisle WQ$F 42.62 Dallas KKA603 42.90 Delafield WLYH 72.08 Keeseville 2 WNJA 42.14 Chamberburgh WNSL 42.62 Ft Worth KKA802 42.90 Greenfield WLYI 74.50 Latharns WJSC 42.14 Clarion WPLR 42.62 Harlingen KKA592 1658* Lewiston WNJT 42.14 Clearfield KGA307 42.62 42.90 WYOMING Malone 2 WNHE 42.14 Coatesville WPQE 42.62 Houston KTXU 1858 Monroe WNJP 42.14 Corry WPLS 42.62 Pecos 1 KTXP 1658' Cheyenne Hg KWHC 1642' Newark WUYZ 42.14 Coudersport WQSD 42.62 San Angelo KKA451 42.90 136 KA2055 1842

:38 FM AND TELEVISION POWER SUPPLIES (Continued from page 26) coils, permit instant starting and reduce COMCO starting surge. Surge- current time on the brushes is also greatly shortened, pro- 3 longing brush life. The graph in Fig. -L- - indicates an average starting time of about 150 milli- seconds to reach 80% of Made for operation on output voltage on the Genemotor shown in Fig. 1. your assigned channel! - Efficiency and regulation are impor- Rpp10 tant features of dynamotor design. Aver- it 6 -volt for mobile transmitter j age types use have efficiencies from 55 to 65% dc- pending upon load and frame size. Air- craft and marine models of 24, 28, or 32 volts input have even higher efficiency. from 60 to 75 %. The performance chart in Fig. 4 illustrates the character- istics of a new marine Genemotor model of exceptionally high efficiency. Regulation of 6 -volt mobile trauinit- ter dynamotors from full output load to ilo load is normally about 15 to 20 %. Ilcre again, the size of load and frame size determine regulation characteristics. AC output ripple or parasitic voltage

(Tia most dynamotor -models is usually

I ' ; or less of output voltage. Ripple voltage is normally measured with an COMCO'S 275 -C IS 'e,44 "f AC rectifier meter across the DC output Tried -- proven successful by months of con- with a 2 -mfd. 'capacitor in series to block Complete 275 -C Mobile Unit - $387.00. tinuous service. In keeping with its "First -in out the DC component. Ripple can the -Field" reputation, COMCO foresaw and also be measured with an oscilloscope Complete Fixed 4 5 0.100° provided for adjacent channel operation! across the output and a 2 -mfd. capacitor Station - $ in series with the DC. The percentage *F.O.B. Factory, Coral Gables, Fla Adjacent Channel Selectivity - at its best. of ripple can then be determined from Subject to change without notice Standby drain only 6 amps. the oscilloscope screen. Because of the Rugged ... Compact. Mounts up front. exceptionally low AC content, dyna- Economical ... easy to maintain. motor filtering is not normally necessary 7iree Skilled, nationwide service organization. on most FM transmitters. AM trans- DEMONSTRATION mitters usually require only a 2 -mfd. Seeing is believing. capacitor across the dynamotor output Write today for a con- for electrical operation. More fil- vincing demonstration. quiet (Advise number of ve- tering is necessary, of course, when dyna- hicles in fleet and motors operate mobile receivers. A typ- operating radius.) Let your nearby COMCO uipminl ical filter network is illustrated in Fig. ///ana /acture 3 of Radio and C/..cf,onic ¿' representative prove of compo- 5. showing the arrangement that COMCO is better COMMUNICATIONS COMPANY, Inc. nents. ... best for you! CORAL GABLES. MIAMI 34. FLORIDA Temperature Ratings: Continuous duty dynamotors are nor- service before the brushes require main- low only the AC component to be repro- mally rated at 30° to 40° C. temperature tenance. Where space is limited, the duced on the screen. In this manner, rise. Intermittent duty transmitter Magmotor type, shown in Fig. 1, employ- partially open windings, reversed corn- models are rated at 50° C. rise above am- ing alnico field magnet construction, of- mutator connections, brush sparking, bient temperature. Normal operating fers the advantage of reduced overall high- resistance connections at commuta- range on continuous duty models is -55 size. with 5 to 10% efficiency increase tor segments, and other defects can be to +50 °C. Intermittent duty operating over the conventional electro- magnetic detected immediately on the screen. range usually is from -55 to +70 °C. field models. The actual oscilloscope tracings in Figs. 7, 8, 9, picture these defects Receivers: Oscilloscope Tests: 6, clearly Dynamotors and which cannot be detected by conven- Dynamotors of lower output are admir- To assure perfect electrical performance, tional meter testing method only. To- ably suited to use with mobile receivers. all dynamotors should be production - gether with high voltage breakdown tests When desinged for the specific applica- tested on an oscilloscope in addition to of input, output, and field circuits, the output, and ripple meters. tion, receiver -type dynamotors afford re- normal input, oscilloscope test shows every weakness is connected directly liable operation and long life. Most dyna- The oscilloscope that may be present. motors of 15 watts output power or less across the dynamotor output with a 2- deliver 2,000 to 5,000 hours of continuous mfd. blocking capacitor in series, to al- (Concluded on page 43) 39 Jill /I 1949 -formerly FBI, and FM RADIO -ELECTRONICS STATE POLICE, Cont. Massilon WPHC 5195* Toledo 114 E Chestnut 4 MR 154.19 WRDQ 5196* Hamilton N J 31.82 Basin KWHH 1842 Wilmington WPHK 5195 31.94 Casper E State St & Adela 10 WNWR 154.43 KWHF 1642* Youngstown WPDQ 2812 Hartford Conn Buena Vista KFLZ 31.58 Lander KWHG 1642* Laramie 8 Fairfield Ave 35 KCA201 154.31 31.70 KWHQ 1642 OKLAHOMA Haverhill Mass 31.82 Rawlings KV/HD 1642* 31.94 Rock 17 Hamilton 10 WTYH 153.95 Springs KWHA 1642 Oklahoma City KOSO 5195* Hingham Mass Bismark KSWD 31.94 Sheridan M A340 1642 KTQO 5195 339 Crosset KYNJ 31.94 Tulsa Main St 12 WHRH 154.19 ZONE POLICE KQEI 5195 Honolulu T H KFJY 37.74 KYNS 31.94 City Hall Bldg Dierks KCJK 37.88* KFJO 37.74 KSYN OREGON 82 KUA201 37.74 31.68 ALABAMA KFJR 31.70 La Grande KOHL 37.74 Birmingham 5195* 3 KFJA 37.74 31.82 WNJO 5195 Salem KOHS 5195 Jacksonville Fla 31.94 1 WHQjl 5195 Dorado KYND 31.94 Decatur 1068 Laura St 35 WBVR 154.31 Fordyce JVJZU 5135* TEXAS Laconia N Hamp KSWE 31.70 Mobile WKGY 2804* Fire Dept Hq 6 KCA215 33.90 31.82 KIA65 2804 Austin KT/CA 5195 Long Beach Calif 31.94 Sel ma Y1A61 2812 Beaumont KGPJ 5190 1417 Peterson 71 KCJA 37.74 91.68 Denton KNHF 5195* Graysonis KYNX 31.99 ARKANSAS Gainesville KADM 153.95 Hampton KSWF 31.99 5195* Los Angeles Calif 2 KCJD Longview 33.90 Hardy KKA584 31.58 KACU 5195 2228 W 6th St 210 KCJE 33.90 Fort Smith KNHA 5195* Wharton KWSO 31.88 Little Rock 5195 14415 Sylvan St. & KASP 5195* 1829 Purdue Ave. 2 KCUG 33.90 31.70 WASHINGTON 31.94 529 N Spring St 110KHQE 154.43 Harrison KSYK CALIFORNIA Madison Wis 31.68 Bellingham KNEF 5140 31.70 Los Angeles KMA89 2804 Seattle 18 S Webster 26 WJVD 153.89 KOA47 2804 Miami Fla 31.82 2808 2808 91.04 2812* Rear of 74 W Flagler 50 WJRV 154.31 Hartford KBSE 5140* Minneapolis Minn 91.68 5135* Snoqualmis Pass KGHE 31.70 5140* City Hall 62 KCNX 5140 Spokane KNGR 5140* 37.74 31.82 5195 Montpelier Vt 1 KQBX 2808 61'Main St 91.94 7480 Van_ouver KNGC 10 WNZB 154.19 Hatton XSYF 31.68 5140* Mtískegon Mich - 7805 Wenatchee KNGQ 31.70 5140 960 W 7935 Yakima KNGB 5140 Hackley St 8 WBWP 154.19 31.82 KFWL 5140* Nampa Idaho 91.94 912 First St So 10 KOA336 154.19 WEST VIRGINIA Hermitage KY OD 91.94 GEORGIA New Britain Conn Hot Springs KYOA 91.70 36 Romney Commercial St 15 WVSG 154.19 31.82 NRMP 79.35* New Haven Conn Columbus A' i hl 5140 31.94 152 Court St 23 WWII WISCONSIN 33.82 Huntsville KKA427 31.58 ILLINOIS New Orleans La 91.70 Greenfield 2 Canal St 1 WSKW 154.25 31.82 WIZR 5195* New York N Y Chicago WC 5195 Racine 31.94 WQ,LJ 2812 79 St Transverse Rd 80 KEA292 DuQuoin WQQ,PPD 5195* 37.74* Malvern KSWC 31.68 East St Louis WNYQ 1630* 5195 Oakland 31.70 Effingham WQPF 5195* INTERZONE POLICE Calif 31.82 Macomb WQPM 5195 1421 Washington St 56 KODE 154.31 91.94 Peoria 1310 Oak St 50 KXDE 154.31 Monticello KWTY WASE 5195* Montgomery Ala 711 High St KIA33 5136* Oaklahoma 31.58 Pontiac WQPP Phoenix 1739 City Okla. 31.70 5195 Ariz W Jackson 428 W Rockford WPQPGD Calif 41 KKA633 153.89 31.82 5195 St KNGG 5195* Okmulgee Okla Springfield 5195 Santa Ana Calif 615 N Syca- 91.94 iVI 123 E 4th St 8 KCJL 154.31 Paron 5195 more St KGHX 5135. KYNE 91.99 WQPZ 5140 Denver Orange Texas Perryville KYNY 31.94 Colo 9th & Columbine 1102 Burton St WQPQ 5195 Sts 10 KTYJ 154.19 Prescott KYNW 91.94 KGPX 5135* Orlando Fla Salem 5195* Tampa Fla Fla Ave & KKA719 31.68 Sterling 5195 19 N Main 8 WOMC 33.94 31.70 Jackson St WPHN 5135* Petersburg Va Atlanta Ga 31.82 WPDY 5135 High & South Sts 12 WCJV 154.19 INDIANA Springfield 111 U. S. 66 KSA29 31.94 5135 Portland Maine Sheridan KYNU 31.94 Indianapolis Ind State Fair - Stamps Charlestown WBMO 163 Brackett St 20 KCA308 33.90 KUHK 31.94 2812 grounds WPHE 5135 Portland Ore Star City Chesterton KSA28 2804 Des Moines la KYOC 31:94 KGHO 5135 NE 21st Ave & Pacific 74 KPFD 33.98' Texarkana KYNT 31.70 2808 Topeka Kans 204 W 5th St KGZC 5135 Rehoboth Mass 2812 Louisville Ky 1306 Bardstown 31.82 Winthrop St 4 WTSG 154.43 31.94 5135 Rd WPDE 5135' Rockford West Camden 5140 New Orleans La Ill KYOF 31.94 2700 Tulane 204 S ist St 30 WROF 154.19 5195* Ave WPEK 5135 Connersville St George N Y WBII 2812 Lansing Mich S Harrison Rd WRDS 5135 Borough CALIFORNIA Indianapolis WMDZ Hall WHGH 35.58* 5195 Detroit Mich WCK 5135* St Petersburg Fla WLSM 2812 Jackson Miss 2550 N State St WRJI 5135 WRSH 5th St & 13th Ave No 20 WKRQ 154.07 Sacramento Hq KALI 2228* 5195* Kansas City Mo 1125 Locust San Diego Calif WAHO 5185 St 153.53 KGPE Cajon Blvd 80 154.31 WAHP 5195 St Louis Mo 1200 KMA357 162.75 Clark Ave KGPC 51355135 SanElta Barbara Calif Mobile WAHQ 5195* Buffalo N Y 1,181 KA3134 2212* WMJ 5135 1313 Kenwood Rd 20 KMA216 154.19 WAHR 5195 Columbus Ohio WPGQ 5135 2226* Jasper 443 E Valley Rd 10 KDVA 154.19 2236* WPHU 5195* Oklahoma City Okla KGPH 5135 Seattle W ash Pendleton WRNR 2812 Portland Ore KOHM 5135 2244* Ptitnamville 223 4th Ave No 87 KRMO 33.90 30.94 WQBG 2812* Memphis Tenn 179 S Barks - Sherman Texas Seymour KSA26 2809 dale WPEC 5135 31.58 315 -19 S Travis 4 KQIS 33.50 31.70 2808* Houston Tex 401 Caroline St KHTP 5135 Stamford Conn 2812 Houstbn Tex (Portable) KHPR 5135* 31.14 178 River Rd 3 KCA290 154.19* 75.70 Olympia Wash Transportation Steubenville Ohio 5130 1 75.82 KNFG 5135 1332 W Adams St 5195 S Charleston W 10 KQA392 154.31 76.94 Va WP WV 5135' Stockton Calif West Lafayette WROR 5195* Milwaukee Wise 4715 W Vliet 72.26 St WPDK 6135 153.83 72.62 KANSAS Sudbury Mass 153.47 Town Hall 6 WDGI 37.74 153.41 Chanute 5195 FIRE DEPARTMENTS Syracuse N Y 153.53 Garden City 219 City Hall 31 KEA331 154.07 1 KHOS 2226* KA 5195* Teaneck Alma Hutchinson KAHR 5195* Akron Ohio N 3 KRRG 2226* 1217 Teaneck Ligonier 158 S High 29 WMUI Rd 8 WGVZ 35.58* 153.47 KSA27 2804 33.74 Toledo Ohio 2808 Alameda Calif 20 KSUJ 154.07 153.41 Bakersfield Calif 550 Erie St 25 WWGF 153.95 153.53 2812 Topeka Kansas Auburn KRWZ 5135* 2101 H St 20 KVWG 154.07 2226* 5140 Beaumont Texas 721 Van Buren St 20 KAA386 154.43 153.47 5195 Louisiana & Pine Sts 30 KGSR 154.19 Tulsa Okla 153.41 Norton Bellaire Texas 1010 E 8th 20 KBPF 153.89 153.63 KAQF 5195 Upper Darby Pa Bakersfield KRBJ Salina KHNS 5195 400 S Rice St 12 KIRW 154.19' 2226* Garret Rd & Long Lane 4 Mobile 1 KRVJ 2226* Topeka KAA45 2804* Belleville N J 10 KA3383 33.42 WICBQ 72.90 Berkeley Calif Warren Ohio 81 KA2660 31.58 2808* 201 S 2120 Grove St Park Ave 7 WLDV 154.19 2228* 2812 40 KBKY 154.19 Washington 5135 Bernardsville N J D C 2244 4th & Douglas N W 113 WAKY 5140* 35 M1U St 10 WNQL 154.43 153.95 Carmel Birmingham Ala Wichita Kansas KR07 224828* 5195 115 E William St 50 KBGZ 154.19 153.47 Wichita 71 KGPZ 39.58 2200 Black Crest Rd 75 KIA580 154.19 Boston Mass Windham Maine 153.41 High St 10 KCA225 154.31 153.53 LOUISIANA 59 Fenway 172 WEY 33.74 Crescent City KBXR 2344* Bridgeport Conn Winston -Salem N C Main St Felton KXJW 153.47 274 & let 15 WOPK 154.43 Baton Rouge WBRP 2812 Middle St 10 WMQjt 154.19 153.41 W Worcester Mass Charleston Va n 607 Tennessee Ave 230 P,rk Av., W ,WV 35.58 153.53 MICHIGAN 10 KQ/1328 154.43 Fortuna KBGG 2226* Charlotte N Carolina FORESTRY- CONSERVATION 153.47 Grand Rapids WPEB 5195* 2400 Plaza Rd 20 K1A569 33.99 153.41 Cincinnati Ohlo MINNESOTA ALABAMA 163.53 St James Ave 100 WJRJ 154.07 Fresno KAY? 2226* Cleveland Ohio Montgomery Hq 1 WTTW 152.99 153.47 Duluth KNFE 5195 310 Carnegie Ave 57 KQA216 33.58 Barton KIA573 152.99 153.41 Columbus Ohio Bayou La Batre WKSX 152.99 153.63 MISSOURI 50 W Broad St 50 WBFM 154.19 Birmingham WKLZ 152.99 KXJM 153.47 Contra Costa Co Calif 57 KXIZ 33.90 Brewton WOLM 152.99 153.41 Jefferson City KHPF 5195* Covington Ky Chapman WRBG 152.99 153.63 Kirkwood KHPC 5195* 3rd & Court Sts 8 WRYP 33.98 Grove Hill WJOH 152.99 Hollister KXJT 153.47 Lee's Summit KEPA 5195* Crawford C Pa Hacoda WEVI 152.99 153.41 Macon KHBP 5195* Conneaut Lake Park KGA210 33.98 Selma WEON 152.99 153.63 North Springfield KHPD 2804 Springboro Pa KGA211 39.98 Semmes KIA281 152.99 Howard Forest KBGJ 2226* 2808 U S Rts 19 & 322 20 KGA267 33.98 Stapleton WRXT 152.99 163.47 2812 Dayton Ohio Vredenberg WOMF 152.99 153.41 5135* 15 E Monument Ave 50 WEHQ 153.95 Mobile 100 WOLH 152.99 153.63 5140* Denver Colo 100 WRXU 31.46 Indio KXYR 2228 5195* 9th & Columbine 40 KFWT 154.31 593 WRXU 152.99 King City KBIQ 2226* Poplar Bluff KHPE 5195* Detroit Mich 153.47 St Joseph KHPH 5195* 2775 W Warren Ave 100 KQA205 153.95 ARKANSAS 153.41 Willow Springs KHPG 5195* Eau Clair Wis 163.53 218 S Dewey 16 WECP 154.31* Little Rock Hq ICAVZ 31.94 La Canada KFRW 2212 OHIO Enosburg Falls Vt 380 KANU 37.66* La Masi KGSC 2226* Bismark St 5 KCA287 154.19 31.58 153.47 Akron WPDO 5195 Fall Brook Calif Cambridge 31.70 153.41 WPHT 5195 1004 S Main St 8 KMA229 154.31* 31.82 153.63 Cincinnati WKDU 5195* Fresno Calif 31.90 Los Angeles KtdjtB 2212* Cleveland WENB 5195* RR 9 15 KMA2o6 154.19 Ashdown Findlay KWTY 31.58 KRNL 2212* WPGG 5195* Garden City Kansas 31.70 Mobile .94 31.70

40 FM AND TELEVISION MAINTENANCE the famousr "55" Unidyne Dynamic ENGINEERS... Here's - the favorite microphone of police forces . . . OPERATORS taxis and trucking lines ... government agencies ...... radio stations throughout the world. There must be a reason for its amazing popularity. Shure "55" Year in -year out dependable performance of Recomme4cded Unidyne Dynamic 4 the highest standards. List Price $67.50 COMMUNICATIONS MANUFACTURERS ...

SHURE ,;egha4.. MICROPHONES This is the "old faithful" Shure "100" Series Carbon -a microphone that can take it under are the "FIELD PROVED" the most severe handling and "knocking around" get. any and all cir- STANDARD in MOBILE a microphone could Under '100" Series cumstances the mighty "100" Series Carbon will COMMUNICATIONS Carbon Microphone "get the message through."

List Price 530.00 SHURE BROTHERS, Inc. Microphones and Acoustic Devices SHURE 225 West Huron Street Chicago 10, Illinois Coble Address: SHUREMICRO

Combining in a nutshell! the sinew Receiver That's Very Low Drain designed an entirely s) with newly drain:4 amp drain: than (standby ical more compactcomp transmitters(standby con- more ecomom quality Instant -Heating standby current rugged,ed s), the total is the has al Zero amp watt installations ever yet maintains ent of even 50 - whiThu KaarSéquapn sumption for w standard the excellence 4 amps) with noted. y' band. only togetherether 152 1s me FM-47Xmp receiver trans ¡n the The FM-179X of performance 15-watt or is more FM-177X unitun ¡t that L mobile instantly miter comer ¡sea to Jo .. Ready KAAR ENGINEERING COMPANY Middlefield Road, Palo Alto, Calif. Canadian Licensee MEASUREMENT ENGINEERING, LTD. ARNPRIOR, ONTARIO ls4 July 1949 formerly FM, and FM RADIO- ELECTRONICS 41 FORESTRY- CONSERVATION, Cont. ILLINOIS Canton WIGE 37.68 Carthage Ridgeland W KGG 31.90 Mao .... 226* WVBM 37.66 Ridgeville WJGH 31.90 Benton KSA229 31.86 KKA222 37.66 Rowesvllle 1 3.47 Mobile 34 KA2864 31.86 DeKalb WMJZ 31.78 153.41 WPMZ 31.22 St Matthews WGJC 31.90 Electric Mills WBGK 37.66 153.53 Perkinston Sheldon WJGQ 31.90 Mariposa KRWY 2226* LOUISIANA WJNV 31.42 Summerton WMJK 31.90 Rankin WVBL 37.66 153.47 Antonia KKA216 31.38 Sumter WJGM 31.90 153.41 Belah KSVJ 31.38 MISSOURI Walterboro WJHR 31.90 153.53 Franklintor KBSZ 31.50 WJGE 31.90 Middletown KRWV 2226* Hammond KBRK 39.94 Eminence 153.97 Hq 185 KQGH 31.30* Mandeville KBSY 31.50 Camdenton 1 KCTL 31.42 TEXAS 153.41 Oberlin 1 KBRW 31.50 Piedmont 153.53 1 KOAP 31.42 Jefferson IN KBWO 2226* Pine Grove KBSH 39.94 Pineville 1 KWFH Monterey (portable) 2 KQPU 2212* 31.30 KBWP 2226* Robert KBSS 31.50 Sullivan 1 KSHG 31.42 Nevada City KXHA 153.47 Springfield KKA982 31.38 Warrenton 98 KHTM 31.42 153.41 1 KW FG 31.42 Conroe KSGZ 31.30 31.50 Kirbyville 153.53 Winona KKA417 31.38 NEW HAMPSHIRE KKA684 31.30 North Sacto KXIG 153.97 Lufkin KBXT 31.30 Maydelle 153.41 MAINE Concord Hq KKA615 31.30 153.53 WKJY 39.42* Woodville KSGX 31.30 WNHF 39.42* Oroville KBGK 2226* Augusta Hq .4 WMML 35.94* 153.47 ML 39.42* WASHINGTON 153.41 258 SÁ 1 39.42* MARYLAND Franklin WSRE 39.42* Olympia Hq 153.53 Loudon KGMO 2244* Palomar Observatory KMA93 72.66 WLOM 39.42* 466 KPKX 31.34* Cumberland Hq 115 WMAU 31.34 Nashua WNWQ Perris KAIV 2226* 31.46 39.42* 26 KETR 31.34* Red Bluff Thurston KEYM 31.34* KXKG 153.47 WKXD 31.58 NE W JERSEY Weyerhaeuser 153.41 Avalon WMBK 31.58 Timber Co KWTF 31.34* 153.53 16 KETS 31.94* Belair WBPL 31.34 Trenton Hq WQVA Redding KRRE 2226* 31.46 31.78 5 KRWE 31.94* 153.47 70 WHCL 31.78 Brandywine WMBU 31.58 31.90 153.41 Burtonsville WMEQ 31.58 WEST VIRGINIA 153.53 Church Creek 30.90 WQWF 31.58 Bass River W VN 39.74* Charleston IN Riverside KXMD 153.47 Cub Hill WMAY 31.34 Batsto W LZ 35.74 153.91 WQVR 39.74* 84 G 35.74 31.46 Beaufort WQVI 39.94* Beckley 153.53 Great Mills WMES 31.58 Belle Plain 35.74 St Helena KXGF 153.47 WQVS 39.42* Logan WBLY X'135.74 Green Hill WET.' 31.58 Blue Anchor W VC 37.46* 153.41 High Knob WMSY 31.58 Budd Lake 153.53 WQVE 39.94* EXPERIMZ::TAL Hillmeade WMCR 31.58 Butler WQVB 35.74* San Andreas KBGN 2226* Hollofield WMDK 31.58 Catfish WQVG - 39.94* Beckley 153.47 Laurel WMCL 31.58 Cedar Bridge W8XGV 75.98 153.41 Long WQVP 39.74* W8XGW 72.15 Hill WMBX 31.58 Culver Lake WQVF 39.94* Charleston 153.53 Madonna WMBE 31.58 Dias Creek W8XCY 75.98 San Bernardino KMA339 2226* WW 30.90 WBXEM 72.14 Mountain Lake Park WBUQ 31.34 Farmingdale 39.74* Charmco 47 KLYG 2226* Nassawango WQWB 31.58 Lakewood W8XGU 72.14 39.74* Logan W8XEK 75.98 Mobile 31.58* New Germany WMFQ 31.58 Lebanon St Forest WBPNQ San Luis Obispo 35.74* W6XEL 72.14 KRRF 2226* Stoeny Forest WMAI 31.58 McKeetown 39.42* 153.97 Thayerville WETH 31.58 May's Landing 153.41 WQVL 39.94* WISCONSIN Welcome WMBQ 31.58 Millville WQVT 39.74* 153.53 Woodlawn ,NMBJ 31.58 Milton WQVJ 39.94* Adams WDY1 31.54 Santa Rosa KXGC 153.47 Mizpah 153.41 WQVW 39.42* Black River Falls WGPQ 31.54 MASSACHUSETTS Old Bridge WLBX 31.90 153.53 Retreat 118 'NHTA 31.54 KBJX 2226* Boston Hq WQVO 39.74* Waitsaukee NDYS 31.54 WRNB 31.34 Toms River WQVX 39.94* 153.97 22 WEQW 31.34 153.41 Union Hill WQVD 35.94* Acushnet WMHQ 31.34 WIndbeam WQVH 39.94* RAILROADS. 153.53 Agawam WCXB 31.34 Sonora KBGM 2226* Andover WRML 31.34 NEW YORK 153.47 3 WBMR 31.34 Alabama Great Southern Washington D C 153.41 Ashland 4 WI VQ 31.34 McPherson Sq 12 WGYQ. 161.49 153.53 Albany Hq 31.98' Alton& Southern St Louis Mo WFKS 158.79 Sterling City KCA289 31.34 KXGA 153.47 Barnstable WQYW 31.34 3105 Missouri Ave 20 WFKV 158.79 NORTH CAROLINA Apache Co 153.41 Billerica 1 WBIQ 31.34 RR McNary Ariz 5 KAPZ 139.69 153.53 Bourne WQWJ 31.34 Burnsville NDXT Atchison Topeka & Santa Fe Chicago Ill Sutter Creek 31.34 80 KXID 153.47 Brimfield WRKT 31.34 IvIobtle WRVO 31.34 East Jackson St 153.41 Buzzards Bay 4 WQWL 31.34 31.46 Argentine Kans 30 & Powell KAA436 160.95 153.53 Carlisle KCA213 31.34 Bolton K1A419 31.34 KCDC 159.45 Twenty -Nine Palms KBIA 2226* 1 WAJP 31.39 Clyde HOKE 159.45 Visalia KRVN WUVM 31.34 2226* Carver 1 WAPE 31.34 Roaring Gap WUVO 31.34 KSVU 180.65 153.47 WQYR 31.34 Argentine Kans Santa Fe Yards 153.41 Chelmsford WKWV 31.34 OHIO I'.AWO 158.85 153.53 WMHO 31.34 KCKD 159.45 Whitewater KUNW 72.66 KSVU 160.65 Yreka Dennis 1 WDNN 31.34 Henley WTII 31.34 KBGL 2226* Duxbury 2 WSVG 31.34 Latham WTTZ 31.34 Los Angeles Calif 2nd Si Santa Fe 153.97 4 KCA351 31.34 Oreton WTTP 31.34 KCKE 161.37 153.41 Fall River WRKQ 31.34 Zaleski WTTU 31.34 Chicago Ill 2154 Archer Ave WIJL 160.65 153.53 Chicago Ill 38 & Central Park Ave Yucaina Falmouth WQYV 31.34 Mobil. 34 WTYP 31.34 KQRX 31.58* 6 WQYK 31.34 WRPK 180.65 Halifax 2 KA3341 31.34 OKLAHOMA Belon N M Santa Fe Yards KOPZ 161.37 CONNECTICUT Hanson WQYU 31.34 KOQT 181.73 KOQT 161.07 Hartford Harvard WQWG 31.34 Oklahoma City lin KOEA 35.74* Hq WSPN 35.74 Harwich WQYA 31.34 Richmond Calif Santa Fe Yards KMA209 KCA224 35.74 1 WTYG 31.34 161.37 Oxford WZPZ OREGON San Francisco Calif 44 Fourth St Sterling 35.74 Holbrook WMZI 31.34 WCJM 35.74 Kingston 3 WRMI 31.34 Salem Hg KMA346 161.37 194 KA3198 31.94* San Bernardino Calif Santa Lakeville 1 WERD 31.34 284 KQSM 31.94* Fe Yards DELAWARE Ludlow KCA268 31.34 Coos Bay KGLM 31.58* KMA347 161.37 Manchester WMHL 31.34 Dallas KQSD 31.5B* Bakersfield Calif Santa Fe Yards Dover Hq , WAPL 37.66* Marion 2 KMA355 160.65 WCLG 31.34 Forest Grove KRNI 31, Mobile Mendon WRKP 31.34 Gold Beach KQHN 97 KCKF 160.65 FLORIDA Middleboro 3 WAAN 31.34 Grants Pass KQSC 16 WLBD 158.49 WQYQ 31.34 Jewell KRNJ 159.79 ü 134 Tallahasse, 1 KA2781 2226* Monterey KCA3 4 31.34 Kinsua KAMV 158.85 153.11 No Andover 2 WHBH 31.34 Klamath Falls KOLB 3J. 1 159.03 153.35 159.45 Bakersfield No Easton 1 WLDK 31.34 La Grande KRDQ 31.58* WJQX 153.35 No Reading WMNR 31.34 Medford KRDP 31.94* 160.65 Blo ants viIle WJQY 153.35 160.95 Clewiston Osterville 5 WRKW 31.34 Mollala KGLK 2236* KIA250 153.11 Oxford WRKU 31.34 Monument KQFP 2236* 161.07 153.35 161.37 De Leon Palmer 1 WRQJ 31.34 Pittsburg KQGP 31.58* Springs KIA225 153.11 Petersham WRKR 31.34 Roseburn KGLP 31.94* 181.73 153.35 Plymouth WQYS 31.34 Salem KQHQ 31.58* 20 WRQI 158.49 Dinsmore WJRT 153.35 158.79 Gainesville 2 WRGE 31.3 Sisters KGLS 31.58* WRMQ 153.11 Plympton 2 WEHE 31.3 Springfield KQJS 31.58* 159.45 153.35 Princeton WQWH 31.34 Sweet Home KORI 30.94* 160.65 Jasper WSYC 153.35 Rehoboth WMHW 31.34 Tillamook KOLA 31.58* 181.37 153.11 Toledo KRLY 31.94* 161.73 Sharon WRKO 31.39 Baltimore & La Belle KIA249 153.11 31.34 Veneta KQSE 31.82* Ohio Baltimore Md Shelburne WCXP Balt & Charles 153.35 Sterling WBPP 31.34 Wallowa KOFD 31.58* KQA378 159.93 Lake City KIA549 Chicago Ill 201 W Harrison. St 2226* Stoughton 1 WBKW 31.34 Madison WFGL 153.11 WIU 159.93 Stow WBGD 31.34 PENNSYLVANIA Willard Ohio Molino WSXR 153.35 Sunderland WFGQ 31.34 KQA234 159.93 Munson WBWY 153.35 Uxbridge 2 WTOQ 31.34 Harrisburg WIRT 30.94* 160,89 153.11 New Castle Pa WBOR 159.27 Wareham 2 WWEU 31.34 Mobile 8 W3XIY 153.17 Baltimore Md Port St Joe WSRM 153.35 Wellfleet WMZH 31.34 Loop Fire Tower KGA72 30.94 Locust Pt WRTO 160.41 St Mobile 41 James Island WMTK 153.11 West Wareham 4 WRKV 31.34 New Cumberland WJAB 35.74* KA2192 159.27 Secoten WGWW 2226* Peters Mountain KGA73 30.94 159.93 Shamrock W AGI 2226* MICHIGAN 160,41 Southport WSTD 2226* RHODE ISLAND 160.89 Tallahassee KIA230 153.11 Marquette Hq 1 WIUQ 159.93 WBHX 35.74* Bessemer Si Lake Erie Pittsburgh 153.35 146 WIXA Providence liq 26 WFWU 35.94* Pa Valrico WRQO 153.35 35.74* 700 Union Trust Bldg 2 WBRR 158.67 Atlanta WBRD 35.74* 1 WXAO' 37.66* 1 WRYK Baldwin WDAI 35.74* Scituate WAWR 35.94* 158.43 GEORGIA 2 WRYL 158.43 Baraga WSWB 35.74* South Kingstown 1 WKGM 37.66* Boyne City WDAQ 35.74* WBWC 159.93 Baxley WIRQ 2226* Crystal WEUO 158.67 Brunswick WGSF 2226* Falls WSWK 35.74* SOUTH CAROLINA Birmingham Southern Ala Escanaba WRRC 35.74* Birmingham Colesburg WMVQ 2226* Gladwin Ng Broom -Marx Bldg 40 KA2ß88 160.29 Eulonia WEGK 2226* WBXA 35.74* Columbia WCNA 31.90 MIo WBKZ 35.74* 151 KA2962 31.78 160.89 Homervllle WANA 2226 *. Newberry 31.90 Boston &'Maine Boston Mass Jesup WKWD WEDM 35.74* WJHJ 150 Causeway St. 10 2226* Sault Ste Marie WMIC Aiken WMJL 31.90 KA2023 160.11 Ludowici WGRR 2226* 35.74* Mechanicsville N Y WRKC 100.11 Macon Traverse City WDAP 35.74* Barton WMJW 31.78 Mobile WNES 2226* Wakefield KQA429 Bennettsville WMJY 31.78 9 KA2024 159.09 Nahunta WKWJ 2226* 35.74* 159.93 Bonneau W JGI 31.90 Carbon County Townsend WGDH 2226* MINNESOTA Camden WMLD 31.78 RR Co Columbia Utah Valdosta KIA237 2226* Conway WJGL 31.90 KOA280 161.37 Waycross WJKR 2226* Mobile 2 KXTJ 181.37 St Paul 25 KQEY 39.74* Dillon WMKX 31.78 of 31.90 Central Georgia Savannah Ga IDAHO Georgetown WJGS 233 W Broad St MISSISSIPPI Greenville WMKV 31.78 East Point Ga Johns Island WJGP 31.90 2 WCAG 161.19 Boise Hq 21 KA2858 2212* Jackson Hq 331 KA2920 31.22 Kingstree WJGO 31.78 Jersey City N J Jersey City Term KRFS 2212* 31.30 Lexington WCNE 31.90 WBYV 160.89 Elk River KRFW 2212* 8 WIGF 37.66 Marion WMJR 31.78 Allentown Pa WKQB 169.89 Orofino KRFP 2212* 10 WOE 31.42 Olanta WMJU 31.78 Mobile 8 WCAS 161.19

42 FM AND TELEVISION It's Alden for .. . POWER SUPPLIES (Continued from page 39) A WORKSHOP facsimile dispatching Operation and Maintenance: equipment Frequency of transmitter operation is an HIGH -GAIN designed for your specific purposes. important factor of performance that wire or for radio circuit. It may be for varies considerably in different mobile A pilot operation or in quantity production- services. In police service, a dynamotor ANTENNA Our engineering provides for messages to be may operate anywhere from 2 to 8 years picked up at scanner with record- automatically depending upon er starting, stopping, and framing automatically, without maintenance, . controlled by transmitter. handled. same will Alden Engineering experience covers the range amount of traffic The of operations from low speed for narrow band- dynamotor may operate only 6 months More than triple the width wire lines to high speed large area equip- ment. to 1 year in a taxicab installation before effective power of the So whether you are dispatching a memo from brush servicing is necessary, because of office to office - or a full size weather map transmitter. across the country -Alden has the system and the more frequent use of the mobile will make to special order equipment that fits transmitter. In our laboratory life tests, your needs. Increase the effective For instance- we consider 10 seconds on and 20 seconds 200 cycle bandwidth 15KC bandwidth of the mobile Memo Newspaper Map off 8 hours per day as the normal cycle power with 4" width -50 LPI with 18" width -100 LPI transmitter. 2 in /min. 9 in /min. rating for intermittent duty transmitter dynamotors, as indicated in the brush- 7 ON life graph, Fig. 2. Continuous duty serv- Increase the operating ice, as required for mobile receivers, is area. Alden engineering opens rated at 24 hours per day. new fields in impulse recording Due to the larger charging capacities Permit the use of low Filling the gap between indicating instruments of present day automobile generator and and the Cathode Ray Oscilloscope. power, low cost equip- Giving a permanent record directly without regulator systems, 6 -volt battery voltage photographic processes. ment. Alden Recording Equipment operates with Al- is frequently well above the nominal 6 fax Electrosensitive Recording Paper producing volts. Dynamotors that draw only 20 or permanent recordings. Alfax is a sensitive high Workshop High -Gain speed paper that does not require special packag- 25 amperes do not decrease this voltage ing. It is stable in storage, and is permanent in assure 6 -volt nominal Beacon Antennas are de- its recording. sufficiently to To solve that facsimile or impulse operation. As the dynamotor output signed specifically for the recording problem - write now to voltage varies in proportion to input 152 -162 megacycle band ALDEN PRODUCTS CO. voltage, a high input voltage not only -taxicab, fire, police, Brockton 64FD, Massachusetts overloads the dynamotor and reduces and private fleet corn - life, may shorten tube life, brush but munications. also. We have encountered instances where battery voltage reached 7.5 or 8 volts at the dynamotor leads because the Design Features FREQUENCY CHANGING automobile 'regulator was not adjusted Low angle of radiation to reduce the voltage to nameplate speci- concentrates energy on IN YOUR fications. the horizon. In cases where reduced regulator volt- Symmetrical design age did not permit a sufficient charging MOBILE SYSTEM? makes azimuth pattern rate to maintain the battery in good con- circular. dition, the regulator was reset to its various former position, and a small, fixed resist- Can be fed with I F Y O U WANT: of transmission ance connected in series with one side types lines. Special fittings Q U A L I T Y of the dynamotor primary lead. This is are available for special to allow only sufficient current to pass at P R E C I S I O N applications. the specified input voltage. Most dyna- D E P E N D A B I L I T Y motors are designed to operate within Enclosed in non -metallic -!- 10% of specified, input voltage, and housing for maximum weather protection. SPECIFY BLILEY CRYSTALS this fact should be carefully considered when specifying performance require- ments. Available for immediate author- Write for Bulletin 38 showing com- In determining the performance of a delivery through ized distributors or your DC supply under operating conditions, it plete line of crystal mountings equipment manufacturer. is necessary to consider not only the available; also advise make and hours of use between servicing but also the average number and length of mobile THE model of your equipment. Better transmissions made daily, weekly, or still, consult your nearest Bliley dis- monthly. Mobile transmitter dynamotors WORKSHOP should deliver 100,000 ten -second trans- tributor. missions before input brush servicing is ASSOCIATES necessary. Continuous -duty dynamotors INCORPORATED PAT. APP. FUR ELECTRIC COMPANY operating mobile receivers should deliver BLILEY Specialists in High -Frequ ency Antennas 2,000 to 5,000 running hours, depending P.O. BOX 1070, ERIE, PENNSYLVANIA on the output load and the dynamotor 65 NEEDHAM STREET model. Newton Highlands 61, Mass.

July 1949 -formerly FM, and FM RADIO -ELECTRONICS 43 RAILROADS, Cont Mobile 5 WYWT 160.05 Mobile 36 KA2875 161.49 161.01 Worland Wyo KOA285 33.18 Great Northern 160.29 Mobile 7 WBYM 160.89 Ry Co St Paul Minn 85 KÁ3238 33.18 9th & Jackson 160.65 Mobile 75 WKQC 160.89 St KVYA 159.93 158.97 W5XXZ 33.18 Mobile 25 KVYK Mobile 10 W1OXSO 2292 Chesapeake & Ohio Detroit Mich 159.93 Port 12 KA2876 161.49 Mobile 3044 W Grand Blvd 5 KVYM 159.93 Steelton & Highsplre RR Co 82 WSXCH 33.18 Port 5 KVYJ 159.93 Steelton Pa California Pipe Line Co New Orleans La Grand RapIds Mich Wyoming Yard KGA256 161.19 1818 Gulf Mobile & Ohlo Mobile Ala Mobile 25 KA2398 161.19 Canal Bldg WBBT 161.49 104 St Laramie Wyo KUKY Newport News Va Pier No 9 WCRR 158.55 Francis Toledo Terminal RR Co 33.28 Meridan Miss RR Yd WTYF 159.03 Toledo Ohio WECH Rock River Wyo K'JLF 33.26 Mobile 159.99 Mobile 6 KUKZ Walbridge Ohio Hump Office WHGN 161.37 44 KA2844 160.11 Mobile 15 WECN 159.99 33.28 161.73 Union Pacific RR Co Omaha Neb California Research Corp San Francisco 4 2 WWGM 416 Calif 203 Bush St Ludington Mich 159.03 Dodge St Mobile Pere Marquette Dock Office WRKN 160.11 Illinois Central RR Co Chicago Ill Los Angeles Cal UP Yd Office 2 KA2790 30.68 135E 11th Canadian River Gas Co Amarillo Tex KAUC 160.17 Rule Hazel Crest Ill 171ct & Ashland Ave Riverside Cal Bldg Manitowoc Wise Ry Dock Office UP Depot KAUF 160.17 Amarillo Tex WRLU 160.11 WMWK 161.85 Pomona Cal UP Depot KAUY 160.17 X.KASS8 39.98 Mobile 15 WEHM KKA661 39.98 Milwaukee Wise Ry Dock Office 161.37 N Platte Neb Hume Tower KBVH 160.41 Dalhart Tex WRMD 160.11 Jacksonville Terminal Co N Platte Neb Yardmaster's Off KKA659 39.98 Jacksonville Mobile 21 KA3216 Detroit Mich Rougentere Yd Off Fla 1000 W Bay St KBVI 160.29 39.98 Jacksonville Fla Myrtle Ave Carr Geophysical Co Houston Tex Industrial Ave & Vernor Hwy Tower Lawrence Kans UP Depot KRBG 160.17 Commerce Bldg WRRE 159.33 WTVF 181.25 Menoken Kans UP Depot KRBN 160.17 Portable 4 KKOP Mobile 27 WCSK Jacksonville Fla Lee St Tower Emmett Kans UP Depot KRBT 1652 158.55 160.17 Central Kentucky Natural Gas Co Charleston 13 WPMQ 159.33 WTVG 161.97 Onaga Kans UP Depot KRBV 160.17 W Va 1033 Mobile 12 WTVH Quarrier St Port WRRD 160.11 161.97 Frankfort Kans UP Depot Means Ky Chesapeake Western Lehigh Valley RR New York N Y KRCR WEXP 33.34 Harrisonburg Va 143 Liberty 160.17 Mobile 22 WEXQ 191 Bruce St WJYT 158.79 St Marysville Kans UP Depot KRDA 160.17 Foster 33.39 Jersey City N J Foot of Johnson Ave Denver Colo Ky KL1351 33.34 Elkton Va WJYV 158.79 36th St Yd Office Cities Service Oil Co Bardes ille Bridgewater Va WJYW WAHW 158.43 KRDB Okla 158.79 Mobile 160.29 Masonic Bldg Staunton Va WJYY 158.79 9 WAHY 158.43 Salt Lake City Utah North Yard Geoph. Los Angeles Junction Ry Co Mobile 5 KA2212 1802 Mobile + 4 WJYZ 158.79 Chicago IU KRDC 80 E 160.29 Chicagd Burlington & Quincy Chicago Ill Jackson Blvd Los Angeles Calif East Yard 1628 547 W Jackson Blvd WIAE 159.69 Los Angeles Cal 3420 Exchange Ave KRDD 160.29 1652 N Kansas City Mo WTQY 161.13 Kansas City Kans 7th St & RR 1700 159.69 Mobile KUDL Yd Clark Fuel Producing Co Mission Tex Galesburg Ill WCYA 160.23 Louisiana lß1,13 KRUP 160.29 P 0 Box 565 WCYR 160.23 & North West New Yorkl N Y7 Pocatello Idaho Retarder Yd Office 170 Broadway Mission Tex K5XDA 33.18 WCZK 161.85 KUCA 160.41 South Kelsey Tex K5XDB Mobile 73 Magnolia Ark KKA244 160.05 Pocatello Idaho Pocatello Ydmstr's 33.18 KA2235 159.89 McNeil Off Sam Fordyce Tex KSXDC 33.18 160.23 Ark KKA245 160.05 KUCC 160.29 Mobile Haynesville La KKA246 160.05 Portland Ore Albina Yd Office 1 KSXDD 33.18 161.43 Emerson Ark Consolidated Oil Co Wichita Falls Tex 161.85 KKA247 160.05 KWBV 160.29 Hamilton Bldg Athens La Kansas City Kans 7th 160.89 KKA248 160.05 St Ydmstr's Off Wichita Falls Tex KKA677 Homer La KKA249 KWLN 33.34 Chicago & Eastern Illinois Chicago Ill 160.05 159.93 Mobile 20 KA3267 33.34 332 S Michigan Ave Gibsland La KKA250 160.05 E Riverton Gardens Wash KOA200 160.17 Mobile Continental Oil Co Ponca City Okla Evanston Ind Morgan Ave 3 KÁ2161 160.05 Seattle Wash KOA201 160.29 1000 South Pine St Minnesota Dakota & Western Tacoma Wash WLC L 161.61 KOA221 159.93 Ponca Cite (tala 3 KGVA 31.18 Mobile 4 WLCB 161.61 Minneapolis Minn Baker Arcade Bldg Mobile 24 KA2337 160.05 International Falls Minn KKA654 31.18 Chicago Great Western Chicago Ill 159.93 Mobile 8 KA2211 KAA352 180.41 39.88 309 W Jackson Blvd 60 KA2338 160.29 Geoph. Mobile 10 KA3)01 1602 Mobile 50 KSXW 158.43 Mobile 2 KÁ2836 160.41 Union Railroad Co Pittsburgh Pa Continental Missouri Kans Pipe Line Co Ponca City Oeta Chicago Milwaukee St Paul & Pacific Texas RR St Louis Mo '700 Union Trust Bldg Drawer 1287 100 Ry Exchange Bldg Rankin S Pine St Chicago Ill Union Station Pa Carrie Furnances Mercedes Tex KCRD Dallas Tex McKinney Ave & Houston 39.66 Mobile 25 KCMS 158.73 WNLT 159.87 McAllen Tex KCRE 39.66 Chicago & North Western Chicago Ill KPWY 159.93 Mobile 12 WNLI 159.87 Mobile Sullivan Tex KSCW 39.68 900 W Madison St 18 KMFR 159.21 Washington Terminal Co Washington D C Rio Grande City Tex KKA340 7 KPFE 159.93 Union Station 39.88 Berkeley Ill KSA357 180.89 Missouri Barreda Tex KKA675 39.86 Mobile 3 WTZQ 160.89 Pacific RR St Louis Mo Washington D C 100 Mass Ave NE Mobile 310 N 13th St 11 KA2393 39.86 Chicago Rock Island & Pacific 2 WWNT 159.45 Cox Drilling Co Wichita Falls Tex Chicago Ill 1133 LaSalle St Station Mobile 32 KMPQ 160.41 Mobile 30 WWNV 159.45 Staley Bldg New Orleans Minneapolis Minn Inver Grove Yards Terminal Co New Orleans La Western Maryland Ry Co Baltimore Md Portable 2 WSXAZ Mobile 6 Standard Oil Bldg 33.34 KC OA 161.61 KA2907 161.49 Mobile 15 WSXEZ 33.34 Des Moines la Rock Island Yards New York Central New York N Y Baltimore Md Pt Covington Yd Off Dowell Incorporated 466 Lexington Tulsa Okla KCOJ 161.61 Ave WWNB 158.67 Kennedy Bldg Kansas Weehawken N J WDHC 161.67 Mobile 6 WWND 158.67 City Karts Armourdale Yards Levelland Tex K5XEX 33.34 KCPT 161.61 Hammond Ind 5339 Hump Rd West Va Northern Philadelphia Pa Mobile Broad St Sta Bldg 50 K5XEY 33.39 Hinsdale Ill 805 W Chicago Ave KSA277 161.13 El Paso Natural Gas Co El Paso Tex WCHU 181.61 WNKW 158.49 Mobile 2 KA2418 161.25 1010 Bassett Tower Cheektowaga N Y Gardenville Chicago Ill LaSalle & Van Buren Yd Casa Grande Ariz KQIR 37.59 WCHZ 161.61 WNYH 180.41 Ehrenburg Ariz KQ/1L Bethelem N Y PETROLEUM COMPANIES 37.54 Silvis IU WCIY 161.61 Selkirk Yd WNYJ 158.79 Tucson Ariz KQNM Manlius N Y Dewitt 37.54 Blue Island Ill Burr Oak Yards Yd WNYP 158.79 Gage N Mexico KQJ9O 37,59 WCJK 181.61 WNYX 161.61 Jal N Mexico Alamo KQIQ 37.54 Bureau Ill WCJL 161.61 KEA367 161.61 Refining t.o Bartlesville Okla El Paso Tex KQp1P Mobile 55 Sweeny Tank Farm 37.54 Mobile 47 WHUF 161.61 KA247 161.67 Pump House Sweeny Tex Mobile 81 KA2397 37,54 N Y Chicago & St Louis Chicago So Shore & So Bend Chicago 111 Cleveland Ohio KKA372 33.34 Portable 4 KJCD 37.54 140 S Dearborn St 50 Public Sq W5XCA 33.34 General Petroleum Corp Los Angeles Calif Olive Siding WRVR 161.37 Buffalo N Y 970 S Park Ave WMHG 161.25 Freeport Tex KKA371 33.34 108 W 2nd St Michigan City Ind WRVS 158.43 Cleveland Ohio KQA245 161.49 Damon Tex KKA373 33.34 Davenport Calif W6XZJ Mobile Mobile 153.35 181.37 113 KA2202 161.25 25 KA2262 33.34 Mobile 2 W6XZK 153.35 Amerada Petroleum New Mobile 25 160.17 Corp York N Y Gravity Meter Exploration Co Houston 2 WRVT 158.43 50 KA2210 120 Broadway 50 WRVU 161.25 KMA411 31.18 Tex 136 Esperson Bldg 158.43 N Y New Haven & Hartford New Haven Conn Millar Calif Delaware Lackawanna & KAPT 31.18 Geoph. Mobile 12 KCLP 152.87 Western 71 Meadow St Bradford Island New York N Y 140 Cedar St Calif KFXR 31.18 Great Lakes Pipe Line Co Kansas City Mo Hoboken New York N Y 132nd St & 'Nillls Ave Rio Vista Calif KIEA 31.18 P 0 Box 2239 N J Pier 6 North River WRTJ Port Allen La W1EB 161.49 KKA391 33.18 Mobile 10 KVUY 33.26 160.29 Hartford Conn KCA269 Mobile 15 Mobile 10 WIEC 160.29 161.55 KIEB 31.18 Helmerlch & Payne Inc Tulsa 3 Okla Mobile 21 WEQJ 161.49 32 KÁ2751 33.18 415 Philtower Bldg 25 KA3248 181.37 Northern Pacific Ry St Geoph. & Rio Paul Minn 26 KA2895 1602 Odessa Tex 1 KSIIA Denver Grande Western Denver Colo 176 E 5th 30.58 1531 Stout St St 1622 Houston Industrial Gas Co Houston 2 Tex Denver Colo 4th Ave Yard Office St Paul Minn Mississippi St Yd Off 1652 2027 Commerce Bldg KAFF 160.83 KNCM 161.25 1676 Ganado Tex KKA777 37.54 Seattle Wash 2266 E Marginal Way Alamosa Colo 8th & State KCOE 160.83 1703 Refugio Tex KHKS 37.54 KTw)C 161.13 American Exploration Co Lafayette La Yoakum Tex KHMS 37.54 Auburn Wash KOA210 161.25 204 N Chestnut St Denver Colo 8th & Osage KDXC 180.83 Humble Oil & Refining Co Houston Tex Yakima Wash KOA223 161.25 Geoph. 3 KNFY 1602 Drawer 2180 - 1216 Main St KDEX 159.81 Mobile Mobile 100 KA3193 159.81 81 KNCQ 161.25 1628 Collier C Fla WHCG 37.19 15 KTQV 8 KAEJ 161.13 1652 WHON 37.19 160.83 Pennsylvania RR Co Philadelphia Pa 1878 Gulf of Mexico Detroit Toledo & Ironton Dearborn Mich KKA470 2134 4921 Calhoun 1617 Pennsylvania Blvd 1700 KKA471 2134 Ridgeway Pa KGA246 160.77 Geoph. 31 KNFV 1602 KKA472 7134 Flat Rock Mich 24002 Vreeland Rd Mobile WDTJ 161.65 5 KA2358 160.77 1628 KKA473 2134 Pittsburgh & Lake Erie Pittsburgh 1652 Acadia Mobile 13 WDTW 161.85 Pa Parish La KRCJ 39.14 Terminal Bldg 1676 KKA354 37.14 Duluth Missabe & Iron Range Duluth Minn Youngstown 500 Jyolvin Bldg Ohio E Youngstown Yds 1700 KKA437 37.14 WPIU Anderson Bros Corp Houston Tex Ascension Alitcfttell Yard KAA463 159.75 159.69 Parish La KKA554 37.14 Mobile 33 WSFF 707 Drennan St Cameron Q Proctor Minn KAA484 159.75 159.69 La KHJH 37.14 Richmond Fredericksburg & Potomac Mobile 24 W4XEJ 33.18 Grand Isle La Mobile 10 KA3441 159.75 KKA393 2134 Richmond Va Broad St Sta Apache Exploration Co. Inc Houston Tex Iberviile Parish La KKA357 37.14 Elgin Joliet & Eastern Chicago Ill Alexandria 1451 Esperson Bldg 208 South Va Potomac Yd WFSB 161.49 KKA553 37.14 LaSalle St Geoph. 2 KA2911 31.06 Whiting Ind Standard Oil Yards WFXN 161.49 La Fouche Parish La KHOA 37.14 Mobile 18 WFXF 161.49 Arkansas Western Gas Co Fayetteville Ark New Iberia La KKA756 37.14 WELJ 159.12 River Terminal Ry Cleveland Ohio 28 E Center St W5XAY 33.18 Plaquemine Parish La KHOF Mobile 7 WLOQ 159.21 37.14 3100E 45th St ry Fayetteville Ark W5XYL 33.18 Erie RR Co Cleveland Ohio WHRR 37.14 Cleveland Ohio Steel E Mobile 15 W5XYM 33.18 Roanoke 101 Prospect Ave NW Plant La KHJO 37.14 WBZX Ashby Drilling Co Dallas Tex St Charles Parish La KHOO Falconer N Y Erle DV Tower 161.61 37.14 Mobile 9 K4.3283 101.61 3415 Westminister St 1 W1OXFK 33.18 St Mary Parish La KHOD 37.14 WJZK 159.33 St Louis San Francisco Ry St Louis 18 W1OXFL. 33.18 Terrebonne Parish La KHJP Jersey City N J Pier 4 WJRP 158.85 Mo 37.14 936 Olive St Atlantic Refining Co Philadelphia 1 Marion Ohio WB Pa Vermilion Parish La KKA436 37.14 Erie Yd Office Springfield Mo 537 263 S Broad St W3XDT WWCB E Commercial 153.35 Brookhaven Miss KSXFL 25.28 159.09 2 Columbia Mansfield Ohio Erie MD Tower KAA251 181.97 W3XDZ 153.35 Miss K5XED 25.28 Mobile 15 EBRO 161.97 Geoph. 32 KÁ2914 1652 Davis C Miss K5XCB 25.28 WMOV 159.09 Seaboard Line Medina Ohio Erle SC Tower WWBA 159.09 Air RR Norfolk Va 31.06 Lamar C Miss K5XCA 25.28 211 SAL Atlantic Seaboard Corp W Marion C Talmadge Ohlo Erie KE Yd Office Bldg Charleston Va Miss KSXCC 25.28 Tampa Fla Lafayette & Meridian Ave 1033 Quarrier St WLYQ 33.34 Wayne C Miss K5XFM 25.28 WWGE 159.09 Bridwell Oil Co Wichita Baytown KBRE Leavlttsburg Ohio Erle SN WRCL 160.17 Falls Tex Tex 168.25 Tower Tampa SAL City Nat'l Bank Bldg 30 W5XFJ Brooks C Tex WSND 159.09 Fla Yeoman Yd Office 33.26 KQBU 37.14 WRGS 160.17 Buckeye Pipe Line Co Lima Ohio Chambers C Tex KKA630 37.14 Creston Ohio Erie SE Tower WROE 159.09 137 W North Youngstown Ohio Atlanta Ga Howells Yd Office %MGT 160.17 St KK4637 37.14 KQA201 159.09 HamletN C No Trenton Mich WVBQ Crockett C Tex KICA356 Mobile 20 WERL Spot House WSNA 160.17 33.26 37.14 158.85 Hamlet NC SAL Yd Office Cygnet Ohio WVBR 33.26 Denver City Tex KKA355 37.14 5 WERL 159.33 WSRR 160.17 Richmond Va SAL Yd Office Toledo Ohio WVES 33.26 Galveston C Tex KKA629 37.14 99 KA2781 159.09 'WWSF 180.17 WWSI 180.17 Lima Ohio WSLV 33.26 Galveston Bay Tex KKA638 37.14 180.05 Savannah Ga SAL Yd Office WWSH 160.17 Samaria Mich WSLZ 33.26 Harbor Island Tex KABO 37.14 Florida East Coast St Augustine Fla Jacksonville Fla WJCZ 160.89 Mobile 100 WSLW 33.26 Houston Tex KKA664 37.14 Yardmaster's Office NE 29th St Mobile 77 WSNX 159.33 The California Co N Orleans 12 La KK9386 37.14 Miami Fla WRRG 160.11 160.17 1818 Canal Bldg Hutchinson C Tex KFPM 37.14 Mobile 18 WRRH 180.11 Port 4 WWSA 159.81 Waterproof La W5XCG 33.18 Ingleside Tex KADD 37.14 Georgia Northern Ry Co Moultrie Ga Southern Railway Co Washington 13 D C Cranfield Miss W SXPD 33.16 Jefferson C Tex KKA317 164.49 Camilla Ga K1A274 100.05 Box 1808 Brookhaven Miss W5XPO 33.18 Kinxville Tex KKA639 37.144 181.01 Atlanta Ga Inman Yd WKXT 158.97 Lafitte La W5XSZ 33.18 McCamey Tex KQZL 37.14 Moultrie Ga KIA395 160.05 Knoxville Tenn J Sevier Yd WSKT 160.85 Barataria La W5XXY 33.18 Newton C Tex KKA313 154.49 161.01 WSKU 160.65 Meeker Colo KAA303 33.18 Odessa Tex KILIM 37.19 Ashburn Ga K1Á396 160.05 Birmingham Ala KIA283 181.49 Rangely Colo KAA325 33.18 KKA702 37.14 161.01 Atlanta Ga KIA470 161.49 Ruston La KKA443 33.18 Pampa Tex KFJS 37.14

44 FM AND TELEVISION RADIO SERVICES (Continued from page 21) of any existing or future station operating in the railroad radio service. 'Me 61044411 The use of this frequency may he authorized to base and mobile stations in the special emergency radio service on the condition that no harmful interference will be caused to the maritime mobile VIKSTIT service. Special emergency operations at points within 150 miles of coastal areas and navigable gulfs, bays, rivers and lakes may be authorized only after a factual finding indicates that, on an engineering basis, no harmful interference will be caused to the maritime mobile service. o This frequency is shared with the highway maintenance radio service. 1 This frequency is reserved for assignment only to national organizations established for relief Carter Genemotor 7-1 16" long, 4 -1 '8" purposes. wide, 3 -1 2" high. Weight only 10 lbs. N This frequency will not be assigned to stations in the special emergency radio service at any point within 150 miles of Chicago, Illinois. Check These o This frequency may be subject to change when the Atlantic City table of frequency allocations for TAXICAB, MARINE below 27.50 mc. comes into force. and Police irearzeted Concluding Part 3 will appear in August NOede Rat.:41d Small size-Can be mounted on its side. Unequalled performance and dependability ore assured Reliable- 100,000 transmissions without OPERATOR LICENSES when you specify Carter Genemotor Power Supplies. servicing. The favorite for over 15 years. (Continued from page 17) Armature triple insulated. Transformer grade * * * * SPECIFICATIONS * * * * laminations. Static and dynamically bal- will be near by and within hearing and Frame capacity 80 watts cont. 150 watts int. (up to 400 watts, on Marine models only.) anced. Precision ball bearings require immediately available to the other per- Input volts DC -5.5 to 115 NO lubrication. son whom he is supervising. The licensed Input current DC -up to 50 amps. Output volts DC -up to 800 volts Super Precision- Frames line reamed to operator may not undertake to exercise Output current DC -up to 500 MA. .0001 accuracy. ,..,..... his tupervision and responsibility by AC ripple content -1% or less Cuter 50 -75% average Overall efficiency- DYNAMOTOR of devices. load to full load means telephone or similar Output regulation -20% no POWER SUttLIES In further connection with the above Storting time -300 milliseconds average WRITE discussion, it may be well to point out New 24 page Dynamotor catalog No. 649 just re- Mag - that the responsible operator, in every . qóß Co: leased. Genemotors, motors, Dynamotors and e e Caller Mutet Co case where service and maintenance complete technical infor- wencrearl duties are performed, is required by Sec- mation. Write today. tion 13.75 of the Rules to sign and date 2641 N. MAPLEWOOD AVENUE an entry in the log of the station con- cerned, or in the station maintenance records if no log is required, giving: in Speech Transmission 1. Pertinent details of all service and For the Ultimate maintenance work performed by him or REPLACE NOW WITH under his supervision; ¡/0 2. His name and address; and TIC U L A 4, a The class, serial number and ex- piration date of his license, except that the information called for /CM AR by 2. and 3. above, so long as it remains unchanged, is not required to be repeated OM/likes in the case of a person regularly em- ployed on a full -time basis at the station. There is enclosed herewith, for your You get high intelligibility, high output, information, a copy of the Commission's more usable power level, less listener Rules Governing Commercial Radio Op= fatigue, and other E -V features. Proved in CARBON AND service. Used in public safety, air- erators,1 together with a copy of the pub - toughest DYNAMIC craft, railroad and government com- lication "Study Guide and Reference munications. High impact phenolic case. Material for Commercial Radio Opera- TYPES Permanent finish. Carbon tor Examinations. Information as to Model 210 weighs only 7 ounces. List price $25.00 the requirements in obtaining each of the and up. various classes of radio operator licenses, Exact Replacement as well as the scope of the various ele- Carbon Mobil -Mikes ments of the written examination, is con- also available for exact tained therein. There are also enclosed replacement in current which may Motorola, RCA, G.E. several other publications and similar equipment. be of interest, in particular one series in Send for Mobil -Mike Bulletin No. 140 connection with the problem of inter- ference to television reception.3 T. J. SLOWIE, Secretary glecArcrIcc, the S. Printing 'Obtainable from U. Government ELECTRO- VOICE, INC., BUCHANAN, MICHIGAN Office, price 25c. °Mimeograph bulletins 30362, 22929, and 24809. Export: 13 East 40th St, New York 16, U.S.A. Cables: Arlab obtainable from the Federal Communications Com- mission, Washington 25, D. C. No charge. July/ 1949 -formerly FM, and FM RAi)IO -- ELECTRONICS 1.i PETROLEUM COMPANIES, Cònt. Michigan Gas Storage Co Jackson Mich Velma KQPI 30.88 P 0 Box 729 212 W Michigan Ave Mobile Fairbury Ill WWI) 158.25 olk C Tex KHIA 37.14 10 KQPJ 30.66 Mobile 18 WXWE Flint Mich KQA221 33.30 Portable 30.66 158.25 KHIB 37.14 Jackson Mich KQA219 33.30 Sohio Texas Gas Transmission Corp Memphis 3 Petroleum Co Houston 2 1 Tes Tenn 931 Port Acres Tex KKA552 37.14 Manchester Mich KQA224 33.30 814 Esperson Bldg Sterick Bldg Raymondville Tex KBQU 37.14 Marion Mich KQA220 33.30 Geoph. Mobile Guthrie La KIA339 39.54 Refugio C Tex KCQX 37.14 28 KA2900 1602 Lisbon La KKA324 Midland Mich KQA222 33.30 35.18 39.54 Upton C Tex KKA358 37.14 Saginaw Mich KQA218 33.30 Sohio Memphis Tenn KIA340 39.54 Pipe Line Co St Louis 1 Mo Mobile Mobile 30 KBRF 158.25 Mobile 50 KA2111 33.30 407 N Eighth St 15 KA2382 39.54 83 KA2301 37.14 Montana -Dakota Utilities Co Minneapolis Buckeye Mich Texas Pipe Line Co Houston 1 Tex 105 KA2798 154.49 WMZD 153.71 P OBox 2332 2 Minn 831 Second Ave S Coldwater Mich WMZF 153.71 40 KA3342 37.19 Cut Bank Mont KOA212 33.18 Freeman Mich Laffitte La KKA239 153.71 Portable 2 KABT 37.14 WMZP 153.71 Lake Salvadore La Saco Mont KOA275 153.71 Greendale Mich WMZB 153.71 KKA240 163.71 3 KBQV 37.14 Shelby Mont KOA211 33.18 Mt Pleasant Mich WBAE Paradis La KKA2,78 153.71 16 KDJO 154.49 153.71 Mobile Telstad Mont KOA213 33.18 Mobile 15 WMZU 30 KA2151 153.71 16 KDJR 37.14 153.71 Tidelands 011 Corp Mobile 1 KA2392 153.71* Southwest Gas Producing Co Inc Monroe La Houston Tex KHJT 37.19 6 KA2392 33.18 P 0 Box 45 2111 Neils Esperson Bldg Geoph. Portable 6 KEPI 1628 Palacios Tex National Geophysical Co Inc Dallas 9 Tex Dubach La K5XDR 153.35 W5XJK 158.31 1652 8800 Lemmon Ave Monroe La Mobile 2 W5XJQ 158.31 1876 KKA511 153.35 Tide Water Associated Geoph. Mobile 3 KA3093 1676 Mobile 10 K5XDS 153.35 Oil Co San Francisco 1700 16 KA3093 31.06 Standard -Fryer Drilling Co Dallas Tex Calif 79 New Montgomery St Independent Exploration Co Houston Tex 4 Mercantile Bank Seaside Calif W6XIQ 153.59 901 Esperson Bldg KA2903 1676 Bldg 25 KA2903 152.87 Portable & Mobile 26 Mobile 1 W6Xi11 153.59 Mobile 20 KA3096 1802 W5XKQ 33.34 Two States Drilling Offshore Navigation Inc New Orleans 18 La Standard Oil Co of Calif Washington D C Co Dallas Tex Portable 8 KIWN 35.54* 3503 Fern St 835 Shoreham Bldg Magnolia Bldg 10 KRVI Eunice 152.75 Mobile 26 KA2307 1628' Avenal Calif KMA2I4 153.71 New Mexico WSXPS 33.26 Interstate Natural Gas Co Monroe La Onyx Refining Co Abilene Tex Box 330 Suisum Calif Mobile 45 WSXPT 33.28 P 0 Box 1482 KMA365 39.14 Union 302 Butternut St Mobile 10 KA2064 153.71 011 Co of Calif Los Angeles 14 Branch La KKA409 39.14 Mobile Calif 617 W Seventh St Fairbanks 26 WSXTQ 33.18 12 KA2905 39.14 La KKA411 39.14 Overseas Navigation Inc New Stanolind Oil & White Lakes La KERP Ferriday La Orleans 18 Gas Co Tulsa Okla 2134 KKA287 39.14 La 3503 Fern St Box 591 5th & Boston KERP 2206 N Baton Rouge La KKA450 39.14 Mobile Mobile 10 KA2258 1628 "' Ulysses Kansas KAA210 12 KA3148 33.54 N Tepetate La KKA531 39.14 33.18 Union Sulphur Co F B Paine Drilling Co Dallas 1 Tex Brownfield Tex KPKL 31.54 Inc Washington 4 D C Pecan Island La KKA530 39.14 302 Guardian Life Bldg National Press Bldg St Cedar Lake Camp Tex KPKK 31.54 Landry Parish La KKA399 39.19 Mobile 10 KBKQ Galveston Tex Church Point La KINN 33.62 Vixe,t La KKA410 39.14 37.14 KKA385 153.71 Eunice Portable 1 KBKH Sabine Tex La KIKI 33.82 Mobile 25 KA2484 39.14 37.14 K5XCK 153.71 1 KBKM Mobile 1 KIQO 33.62 Interstate Oil Pipe Line Co Wilson Okla 37.14 K5XCM 153.71 1 KBKN Hackberry La KIKN 33.82 Box 967 37.14 30 KSXCT 153.71 Hayes La 1 KRLP 1 KIFB 33.82 Anse LaButte La KDEP 39.54 37.14 KA2245 153.71 Pan American Pipe Line Co Houston 2 1 KA2248 153.71 KIQJC 33.82 Delhi La KKA757 39.54 Tex Lake Meule Esperson Bldg 1 KA2297 153.71 Charles La KGWT 33.82 Lake St John La KKA644 39.54 Kilgore Roanoke La Tex KHIL 31.98 1 KA2248 153.71 KIFP 33.62 Sunset La 1 KDEU 39.54 Port Isabel Tex KTJA 33.26 1 KA2249 153.71 KIGP 33.62 Crardield Miss WKAO 39.54 Quitman Tex Sulphur La KHOH 33.62 Fayette Miss KKA412 31.98 1 KA2783 153.71 WKAK 39.54 Raymondsville Tex KTJB 33.26 Geoph. Mobile 25 KA2799 1628 KKA535 33.82 Oklahoma City Okla KXDS 156.99 Mobile & Portable Thornwell La KEUX 33.62 Wilson Okla 15 KHIR 33.26 13 KA2964 1700 KAJR 158.99 Stanolind Pipe Line Co Okla ICIQN 33.62 Mobile 11 Pelican Oil Purchasers Inc Lafayette La ' Tulsa KCBN 39.54 P O Box 591 Woodlawn La KIDH 33.62 50 KAJP P 0 Box 1090 156.99 Jefferson Shawnee Okla KKA442 2292 KIRL 33.82 Portable 1 Davis Parish KRXT 33.18 KCBO 39.54 Kirby Wyo KGRS 153.71 4 KOFW 158.99 Lafayette La KEUL 33.18 La & Texas Area KKA547 33.82 Interstate Petroleum Communications Tepetate La KEUH 33.18 KGRU 153.71 KKAMS 33.62 Inc Mobile Mobile 10 KA2725 Mobile New York 20 N Y 30 Rockefeller Plaza 29 KA2749 33.18 2292' 33 KIWL 33.62 Pettus Communications Inc Tulsa 2 Okla 13 153.71. 3 KA2846 Roxane. Ill W9XFN 153.59 Star Oil 33.62 Monroe La P O Box 2649 American Airlines Bldg Co Dallas Tex 2310 Mercantile United Fuel Gas Co Charleston W Va KKA533 30.82 Nordheim Bldg 1033 Hobbs New Mexico KTYX 158.13 Tex KKA328 33.18 Quarrier St Odessa Pettus Tex KKA329 33.18 Mobile 30 WSXCL 33.18 Boldman Ky K1A45 72.86 Tex KWBH 30.82 Runge Sun Oil Co Dallas Tex P O Box 2880 Kermit Tex W5XWX 37.82 Tex KKA330 33.18 Inez Ky WQZO 33.34 Mobile Mobile 21 KA2339 33.18 Marcus Hook Pa KGA281 153.05 Maytown Ky KIA48 75.50 15 KWAC 30.82 Petty GeophySleal Mobile :15 KA2498 153.05 8 W5XWY Engineering Co KIA428 33.34 37.82 San Antonio Geoph. Mobile , 8 KA3095 1602 10 W9XFO 153.59 Tex 317 Sixth St KIA47 72.88 Geoph. Mobile 2 KPYK 1602 10 KA3095 153.11 Charlestown W Va WQZS 33.34 10 KA2356 158.13 Superior Oil Co Houston 2 Tex 6 KA2359 27.45 10 KPYK 43.02 KQA38 72.66 34 KA2847 1628 400 Oil & Gas Bldg Huntington W Va WQZF 33.34 J M Huber Corp Borger Tex P O Box 831 Cameron La 200 First 3t Huber Addition Phillips Petroleum Co Washington 6 D C W5XTL 2292* On Bee Mt W Va KQA39 75.50 Berger Tex 404 Commonwealth Bldg KFHK 2134* Mobile 127 WQZH 33.34 KGTG 37.74 Dumas Tex Iberville Parish La KCFE United Mobile 50 KGTV 37.74 W5XCD 33.34 2134* Gas Pipe Line Co Shreveport La Hansford C Tex W5XCC Intercoastal City La KKA876 2292+ P 0 Box 1407 1525 S D Johnson Wichita Falls Tex 33.34 Lake Arthur Fairfield Ave. Wichita Phillips Tex W5XCB 33.34 La KKA496 2292* Arcadia La KKA28 72.68 Nat'l Bank Bldg Maringuin La KKA468 Mobile 18 W 1OXBW W5XWF 158.13 2292* Bogalusa La WKHC 31.18 33.18 Sanford Tex Mobile 2 KFHJ G E Kadane & Sons Wichita Falls Tex W 5XPB 158.13 2134* Houma La WZSZ 31.18 Hamilton Bldg Mobile 150 KA2365 33.34 2 KUFH 2206* Iowa La KKA435 31.18 Wichita Falls Tex W5XWS 50 KA2365 158.13 29 KA2275 2292* New Orleans La WZSL 31.18 33.26 Geoph. Mobile Geoph. Mobile 3 KA3003 Mobile 22 W5XWT 33.26 52 KA3123 1628 1802. Shreveport La KKA503 31.18 Kerr -McGee Oil Industries Inc Berwick La 3 KA3123 30.82 39 KA3003 25.20 Sterlington La KKA242 31.18 Premier Oil Refining Co Ranger Tex 3 KA300t? 152.75 Jackson Miss WKHE 31.18 P 0 Box 1700 Susquehanna Line Berwick La Box 75 Pipe Co Phila 3 Penn Jefferson Davis C Miss WKHB 31.18 ¡COCA 30.82 Arp Tex Mobile & Portable 5 WSYNtr 158.01+ Mobile 1 KTHK 30.82 Carthage Tex KUHC 31.18 KKA583 2134+ Tennessee & Kingery Drilling Baird Tex KQJCG 30.82 Gas Transmission Co Houston Portable & Mobile 114 KUHB 31.02 Co Inc St Jo Tex 1 Tex P Box 1545 Longview Tex KTHM 30.82 0 Box 2511 600 Commerce Bldg 31.18 P 0 Campbellsville Ky WIAW St Jo Tex KKA441 Novice Tex KQXH 30.82 33.28 United Geophysical Co Pasadena 1 Calif 33.34 Ranger Tex Morehead Ky WVBH 33.26 535 Mobile 19 KA2521 33.34 KKA319 30.82 E Colorado St KKA320 30.82 Mansfield La KKA692 33.26 Mobile 139 KA3094 1802 Frank A Ledward Pico Calif Natchitoches La 133 S Rosemead Blvd KKA628 30.82 KKA776 33.28 6 KA3094 35.08 Mobile 10 W Monroe La KKA563 33.28 4 KA3094 152.87 Geoph Mobile 2 W6XIO 154.49* KTHP 30.82 Batesville Miss Lion Oil Co El Dorado Ark 23 KA2864 30.82 KKA701 33.26 Virginia Gas Transmission Corp Charleston Pure Oil Co Houston Tex P O Box 239 Greenville Miss KKA650 33.28 W Va 1033 Quarrier St Magnolia Ark KCLT 153.71 Dickson Tenn Shuler Ark Cameron La W5XNA 33.34 KIA586 33.26 Gala Va WLCH 33.34 KCLQ 153.71 Worland Mo Lobelville Tenn KIA585 33.26 Mobile 15 KCLS 153.71 W7XVG 158.25 Lexington Va K1A248 33.34 W7XVH 158.25 Middleton Tenn KIA560 33.26 Stanardsville Va WOAG 33.34 L h1 Lockhart San Antonio Tex Portland Tenn KIA570 2000 Milani Bldg Mobile 1 WSXNB 33.34 33.28 W 4xX0 72.88 12 W7XBR Cleveland Tex KKA693 33.26 Mobile 25 WOAH 33.34 Geoph. Mobile 7 KBXL 1602e 158.25 E Bernard Loffland Geoph. Mobile 3 KA2898 1628 Tex KKA230 33.26 Warren Oil Corporation Tulsa Okla Bros Co Tulsa 1 Okla Houston Tex KKA261 33.28 P 0 Box 1649 Republic Exploration Co Tulsa Okla P 0 Box 1589 Jasper Tex Mobile 5 KA3176 37.14 Mobile 5 KA2184 2118* 815 South Boulder Ave Victoria Tex IA 485 33.26 Portable 1 KEBH 37.14 Magnolia Petroleum Co Dallas 1 Tex Mobile 11 KA2518 1700" Mobile . 1. ^4 KA3353 53..., Warren Petroleum Corporation Houston 2 P 0 Box 9)) Republic Natural Gas Co Dallas Tex The Texas Company Washington Hickok Kansas WXRX 1505 Federal 4 D C Tex 400 Oil & Gas Bldg 33.39 518 Munsey Bldg Conroe Tex KEMY 33.28 Eugene Island La KRHI 39.59 Mobile 13 W5XGN 33.18 Bay de Chene La Beaumont Tex Root KBQW 35.48 Houston Tex KIBV 33.28 KKA532 31.59 Petroleum Co El Dorado Ark Box 791 Bay St Elaine La KTBG Texas KIBX Mobile 10 WXRY El Dorado Ark KFVE 35.46 City Tex 33.28 33.34 33.18 Caillou Island La KTBM 35.46 Mobile 12 KIBZ 1 KFHX Lockhart Ark W5XCF 33.26 39.54 33.18 Delacroix La KT'AI West Central Drilling Co Dallas Tex 1 Magnolia 35.48 KOXI 2206 Ark KVFI 33.18 KKA643 4 Mt Holly Ark 35.48 Continental Bldg KRHJ 39.54 W5XCF 33.18 Delta Duck Club La KTAG Abilene Tex KKA376 8 Schuler Ark 35.48 42.98 KRIS 39.54 KVEK 33.18 Dog Lake La KTBQ 35.48 Mobile 22 KFBU 42.98 14 KA2328 39.54 Stephens Ark KVKI 33.18 Garden Island Bay La KTAJ 35.48 West Production Co Houston 1 Tex 36 KA2831 31.54 Ora La KVGE 33.18 Golden Meadow La KTAK 35.46 Box 1879, 9 KA2784 39.54 Mobile 8 KVKN 33.18 KKA218 35.46 Mobile 8 W5XCN 25.04 Portable 1 KRIA 39.54 Salt Lake Pipe Line Co Washington D C Manufacturers Harvey La KVTN 35.48 The Western Company Seagraves Tex Light & Heat Co 635 Shoreham Bldg Houma La KTBT 35.46 Box 5312 Pittsburgh Pa 800 Union Trust Bldg Rangely Colo KTOX 158.25 Ellwood City Pa Duchesne Houma Warehouse La KTBP 35.46 Eunice N Mexico W5XBP 35.70 KGA213 33.34 Utah KTOQ 158.25 La Fitte La KTAQ 35.46 Levelland Tex W5XBO 35.70 Hickory Pa KGA214 33.34 Salt Lake Utah KTOF 158.25 Lake Kane Pa Mobile Barre La KTBO 35.48 Odessa Tex WSXBM 35.70 KGA212 33.34 15 KTRD 158.25 KKA359 35.46 Seagraves Tex WSXBN 35.70 Pittsburg Pa KGA215 33.34 Shamrock Oil & Gas Corp Amarillo Tex Lake Petto La Western Mobile 60 KTBJ 35.46 Geophysical Co Los Angeles Calif KA2091 33.34 P 0 Box 631 Leevllle La KKA293 35.48 1333 S Hope St Marine Exploration Co Houston 6 Tex Sunray Tex KRYV 37.50 Port Texaco La KTAH 35.48 Geoph. Mobile 8 KA2899 1602 3732 Westheimer Rd Mobile 30 KRYX 37.50 Geoph. Mobile Geoph. Mobile 48 31A2997 1602 1828 25 KA2198 152.75+ Signal Oil & Gas Co Los Angeles Calif 12 KA2997 30.62 1852 20 30.82 811 West Seventy St 2 KA2997 152.75 1878 John W Mecom Houston 2 Tes Portable & Mobile 10 KAVP 1602 3100 Gulf Bldg Portable 1 KTLT 35.46 1700 Sinclair Prairie Oil Co Tulsa Okla Texas Eastern Transmission Corp Whitman Drilling Co Houston 1 Tex Bloomington Tex KKA426 30.74 P 0 Box 521 Dickinson Shreveport 94 La P 0 Box 1812 908 Esperson Bldg Tex K5XFO 30.74 Seminole Okla W5XXK 153.71 Mobile 215 KA3337 25.20 Cameron La KKA392 2134* Houston Tex W5XDD 30.74 Arp Tex W5XAL 153.71 Texas Mobile Empire Pipe Line Co Tulsa 2 Okla 2206* 9 W5XDF 30.74 Tyler Tex KKA899 153.71 Box 2420 Yegua Corporation Houston 2 Tex 1 W5XDK 30.74 Mobile 33 WSXAM 153.71 Campus Ill WXWG 158.25 2302 Esperson Bldg 1 WSXEE 30.74 Skelly Oil Co Tulsa Okla P 0 Box 1850 Cookeville Ill WXWF 158.25 Geoph. Mobile 6 KA3121 31.06

COPYRIGHT NOTICE ing list for business purposes unless per- At the time this Directory was revised, mission is requested of the publisher, and is there were about 1,9,50 pending applications. The Directory of Mobile Radio Systems granted in writing. These do not appear in the Directory, since published in this issue is a copyright feature Information concerning the weekly list of only licensed stations are listed. Currently, of FM -TV Magazine, and is provided for new applicants ' for mobile radio facilities some 100 applications are being filed each the personal information of our readers. can be obtained from the Directory Depart- week in the mobile radio classifications, and This Directory must not be used as a mail- ment of FM -TV Magazine. this rate is expected to increase.

46 FM AND TELEVISION ANNOUNCIN NEW MOBILE MIKE STYLE 737

THIS NEW MOBILE MICROPHONE PROVIDES CONSISTENTLY HIGHER MODULATION PERFORMANCE

:pÑ\%l!T9F1M// Weighs a mere 7 oz. Button is riveted on NMYE MIMI iie.:'711/t/ as. M./ tf eDP 6ID'1.O face of mike. Easy change -over from speak- egrese .1 with wrist. wr. essst- ing to hang -up position turn of ...n. Læzi/ n Tough, shock -proof aluminum alloy case...... ag j irii and 'M'7r_ e.N. !! Switch all other internal elements :.a ` completely enclosed. Carbon mike ele- Model 9900. 32 db below 1 rob for 10 ben ment cushioned in rubber makes unit Model 9901, 2S db below 1 voll for 10 bon \ \ shock -and -vibration proof. Available 'e" in two models designed to match G/FfN iriC / [D 50 -200 ohm circuits and to wM1I[ J SLCK J rf GfFN /[D ylflAl } eEIAI operate at 5 -100 ma SLACK w iif J to circuit. Cirtuit Meg "A for G.t.,ol Mog B fe. M e delt 9900 A L 9901A Models 9900 B L 9901 B

When ordering, specify circuit re- quired as "9900 A" or "9900 B" new station E4

** 1st CHOICE of station operators. ROANWELL CORPORATION 662 Pacific St. Brooklyn 17, N. Y. * ** 1st CHOICE of Police. Airlines. Government. and private communications systems. ZOPHAR LIST WAXES

Just released: a Who's Who of Book COMPOUNDS 1Í the FM broadcast industry. 3,300 CI includes names and titles of and top management and operating staff, such as president, general manager, station manager, program EMULSIONS director, chief engineer, and many others. Also shown for each of over 700 stations are: FOR INSULATING and WATERPROOFING 11 Call letters of ELECTRICAL and 11 RADIO COMPONENTS Frequency Name of licensee í Also for I;Í Network Ì CONTAINERS and PAPER I, AM and TV affiliates IMPREGNATION Location FM, and standard There is a reason. VHF, FUNGUS RESISTANT WAXES AM broadcasters acclaim the structural ex- This reference book has been cellence and all around low cost of Win - compiled from data furnished by charger's performance proven towers. The the stations themselves and is the ZOPHAR WAXES and COMPOUNDS radiator's precision of Wincharger vertical most accurate such list now avail- Meet all army and navy the fact that over one patterns is testified by able. For maximum convenience specifications if required hundred and twenty stations are now using and usefulness, it is arranged both Wincharger towers in directional arrays geographically by location and even six element arrays! Higher quality, alphabetically by call letters. Inquiries Invited wider versatility, lower cost have made Wincharger antenna towers America's first 68 pages, 51,2 by 8tßí, sturdily bound. $2.00 per copy. Order choice. INC. direct from the publishers: FM - TV, ZOPHAR MILLS, Great Barrington, Mass. FOUNDED 1846 122 -26th ST., BROOKLYN, N. Y.

.1,11g N /SI 111rn1crl /'.1/, ;tnli t'.1/ RAV1O-Ei.ECTRO\ICS Follow the Leaders to L

With the increasing demand for higher powers at higher frequencies the importance of close relationship between tube and circuit design has become paramount.

A large segment of the laboratory facilities at Eitel- McCullough is concerned with the development of basic new circuits closely correlated with vacuum tube development. The efforts of this group are receiving wide recognition for their outstanding accomplishments. These new circuits are being made available, as developed, to the industry enabling greater realization of a vacuum tube's potential abilities.

Evidence of these efforts is illustrated above . . . A 14- tube annular r -f generator. This compact equipment can provide 500 watts of CW power at 1000 -Mc, and has operat- ing possibilities as high as 2500 -Mc. This is but one appli- cation of the basic annular circuit design developed by Eimac. The power -output in such a generator is directly proportional to the number of tubes used, and single tube efficiency is maintained. EITEL-McCULLOUGII INC. 728 SAN MATEO AVE., SAN BRUNO, CALIFORNIA

Export Agents. Fraxar & Hansen, 301 Clay St San Francisco, California

FM A\D TELEVISION TO THE COMMUNICATIONS ENGINEER .

VFK//1k8&W3 ($;

Mobile Transmitting and Receiv- ing Unit. Convenient desk -drawer EXCEL IN FEATURES THAT COUNT type for quicker, easier servicing.

Remote Control Unit (above left). Operates station transmitter and receiver from remote location. Only ad- re- UNEQUALLED AUDIO QUALITY - Philco exclusive single pair of telephone lines vanced FM phase modulator and detector assure clear- quired to connect unit with transmitter. est, crispest speech intelligibility in the industry . . . crystal clear reproduction even at weak signal level. l 152 MC units STORY FULL COVERAGE - Philco 30 -50 and -162 WRITE TODAY FOR THE COMPLETE deliver full rated power to give maximum coverage. OF THE MOST MODERN FM COMMUNI- CATIONS SYSTEMS IN THE INDUSTRY UTMOST FLEXIBILITY of INSTALLATION -Only Philco mobile units can be mounted side by side, end to end or station installations pro- stacked drawer fashion. Fixed Dept. DH7, wall mounting for medium power; Industrial Division, vide floor, desk and Corporation, Philadelphia 34, Pa. cabinet mounting for both high and medium power. Philco All with simplified control and cable connections. Please send latest information on are Philco FM Communications Systems. MINIMUM MAINTENANCE - Philco FM Systems engineered for freedom from service problems ... heavy duty components assure long life ... transmitters and NAME TITLE- receivers operate with standard tubes ... parts are readily accessible ... interchangeable drawer type mobile chassis do away with time out for servicing.

CITY STATE 1. meets the challenge! anno " SEARCH LINE "' solves th

DESIGN- «8" ESSENTIAL Today! The ideal two -way mobile radio communications equip- ment is here. Research INVENTIONS make experimentation, development and field testing in systems operation produced this scientific answer to the adjacent channel operations problem. ADJACENT CHANNEL The minor problem of super -precision selectivity was solved in six months, but two years of research and the creation of five major inventions were re- OPERATIONS PRACTICABLE quired to solve the major problem of intermodulation before same -area ad- jacent channel operation became practicable. SENSICON circuit (Pat. Pending) ISO -Q cavities (Pat. Pending) PERFORMANCE -Here is equipment that is new all through, with the STATOMIC oscillator (Pat. Pending) amazing circuits which provide a new standard of performance for the industry. Here PERMAKAY filter (Pat. Pending) is equipment to give you the most modern communications system you BRIDGE BALANCED CRYSTAL OVEN can own -actually anticipating the standards of good engineering (Pat. Pending) practice for the future. This startling departure from the conventional offering new sim- CAPACITANCE DISCRIMINATOR (U.S. plicity Pat. 2,404,359) of maintenance and a new standard of reliability -this engineering and scientific achievement is the new MOTOROLA. DIFFERENTIAL SQUELCH (U.S. Pat. 2,343,115) Remember! Selectivity alone is not the answer to adjacent channel operation. I.D.C. slope filter (Pat. Pending) The integrated systems combination of these new inventions is the modern engineering answer to full channel utilization.

1 he BEST is now BETTER eve before MOTOROLA, INC., 4545 Augusta Blvd., Chicago, III. ... Communications Division Dept. FM -TV - July Name

Position

Firm COMPARE feature for feature with any other equi ment on the market ... GET THE COMPLETE Address STORY ... MAIL THIS COUPON TODAY . . . City Zone State J