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BY T H E E D I T O R Model 5P12 Rocks Super- Twelve. Amazing lows and highs in 12- inch coaxial speaker. Response 30- 13,000 cps ±5 db. 25 watts. Imp: 16 ohms. 3 lb. Alnico V magnet. 7/t" depth behind mtg. panel list Price...$f90.00 Audiophile Net..$54.00 Model SPIS Radax Super- FINeen. Fullest range and balance in 15 -inch coaxial speaker. Response 30- 13,000 cps. ±5 db. 30 watts. Imp: 16 ohms. 51/4 lb. Alnico V magnet. 8%" depth behind mtg. panel. List Price... $120.00 Audiophile Net..$72.00 8 Model SP8.8 Radas Super -Eight. Unusual bass balance in 8 -inch coaxial speaker. Response 35- 13,000 cps ±6 db. 15 -20 watts. Imp: 8 ohms. 1 lb. Alnico V magnet. 5s/s" depth behind mtg. panel. List Price... $42.50 Audiophile Net.. $25.50 Model SP12 -B Radas Twelve. Full ronge 1 2 -inch coaxial speaker. Response 35. 13,000 cps ±6 db. 15.20 watts. Imp: 8 ohms. 1 lb. Alnico V magnet. 6W' depth behind mtg. panel. List Price...545.00 Audiophile Net .. $27.00 Enjoy the Range and the Realism New concepts by E -V create new values for you in the enjoyment of sound reproduction. Unique Radax principle and built-in mechanical crossover permit design of the low -frequency cone and high- frequency axial radiator for extended optimum bass and treble response. Heavier "pound- rated" magnets provide more driving power and generous distortion damping factors. These and other E -V quality features assure more listening pleasure. Hear them at your E -V Distributor or Write for FREE Hi -Fi Bulletins MICH. 410 CARROLL ST. BUCHANAN, U.S.A. Cables Arlob Export, 13 r. 401h SI., N.V. 16, CONELRAD AND AMATEUR RADIO AS EVERYONE knows by now. Conelrad (Control of Electromagnetic Radiation) is an FCC project to prevent the use, by enemy forces, of the nation's r.f. sources as navigation aids in an attack. While Conelrad has so far been publicized in its application to commercial broadcasting, every radio service will have to have its own Conelrad plan in the near future. At a recent Conference we attended in Washington, amateur representatives sat down with officials of the FCC, the NCDA, and the military to devise a way to apply Conelrad to the amateur service. The particular systems of Conelrad developed for commercial broadcasting obviously cannot be applied to the entire Amateur Radio Service, although something similar will be worked out for stations in RACES (Radio Amateur Civil Emergency Service). Conelrad, for the hams, will involve flashing a "Radio Alert" to all operating amateur stations, so that all transmissions can be shut down with minimum delay, to prevent their use for direction -finding or homing. It was the avowed intention of the FCC to adapt Conelrad in ways that would be the least burdensome to the amateurs. We hams were not called in to listen to proposed rules and make comments. Instead, the problems were handed to us and we were asked to provide the proposed rules. The usual FCC "Notice of Proposed Rule -Making" will be issued, and all hams and amateur groups will have the right to file comment. Keep in mind, however, that the National Security Resources Board and the Department of Defense will have to pass on Conelrad plans, and they may demand something more stringent than what the FCC proposes. Basically, it will be required that all active amateur stations be able to receive the same Radio Alert that will trigger Conelrad for the broadcast stations. This, as far as FCC is concerned, can mean anything from a fancy "autocall" gadget to an ordinary a.c: d.c. set always tuned to a local broadcaster. Most ham households have at least one of these "midgets" around. If an enemy attack is imminent, the Radio Alert will be given over all broadcast stations in the affected region by keying the carrier, in a simple way, for fifteen seconds, and sending a 1000 -cycle tone for fifteen seconds. This sequence can be used to trip an alarm or simply to attract the listener's attention. Following a brief Civilian Defense announcement, the station will move to it$ Conelrad frequency. As proposed, it will not be necessary for the ham to monitor a broadcast station twenty - four hours a day, but only while he is operating. and even intermittent checking (before each amateur transmission) of the broadcast carrier will be satisfactory. If the carrier isn't there, the ham can check to see what happened to it, and act accordingly. The <strong>Com</strong>mission does not at present prescribe how an amateur shall receive the alert. It will require him to be able to receive and act on it; how he does it will be up to him. No ham will be forced to own any gadget. The question of getting the amateurs back on the air after the "all - clear" came up for discussion. Conelrad itself could do this effectively, but the amateurs themselves suggested that normal operation should not be resumed until "affirmatively authorized" by the FCC. Except for pre- announced drills, Conelrad will not be used unless the chips are really down. In that case, ordinary amateur operation would have to cease, as it did after Pearl Harbor. There would only be chaos if Conelrad triggered the hams back on the air while FCC was trying to implement an order to shut them down. In the unlikely event of a "false alarm," FCC could at once authorize normal activity. RACES will continue in any event. The problem of providing every amateur with a cheap, foolproof alerting device is a challenge to the tremendous inventiveness of the amateur body. Many simple automatic -alarm circuits have been developed, and we plan to publish late designs. It seems to us that transistors would be ideal in this application. A continuously - running transistor monitor could be run off a couple of dry cells, would seldom overheat, burn out, or lose its power source in an emergency, an important consideration from the standpoint of family protection. The various government experts, present at the conference, cited the amateurs' past record of cooperativeness and expressed confidence that the hams would, as always, act in the national interest. It was heartening indeed for us to participate in the discussions and to observe the FCC's reluctance to burden the amateurs unduly; its refusal to seek the "easy way out" by shutting them down prematurely, its procedure of letting the hams present work out solutions and proposed rules, and the friendly cooperation and unanimity on final deci- sions. The FCC is to be congratulated on their approach to the problem O. R. RADIO & TEL<strong>EVIS</strong>ION NEWS
THE ONLY COMPLETE CATALOG FOR EVERYTHING IN TV, RADIO AND INDUSTRIAL ELECTRONICS get your 1953 ALLIED 236 -PAGE CATALOG it's complete it's value -packed Allied , o.._ .» THE WORLD'S LARGEST STOCKS TV and Radio Parts Test Instruments Hi -Fi and P.A. Equipment Custom TV Chassis AM, FM Tuners & Radios Recorders and Supplies Amateur Station Gear Builders Supplies Equipment for Industry QUICK EXPERT SERVICE Send for it today! 1 Here's the one authoritative, complete Buying Guide to Everything in Electronics- packed with the world's largest selections of quality equipment at lowest money- saving prices. See the latest in TV custom chassis, TV antennas and accessories; AM and FM tuners and radios; High -Fidelity Custom Sound components; latest P.A. Systems and accessories; recorders; Amateur receivers, transmitters and station gear; specialized industrial electronic equipment; test instruments; builders' kits; huge listings of parts, tubes, tools, books -your choice of the world's most complete stocks of quality equipment. ALLIED gives you every buying advantage; speedy delivery, expert personal help, lowest prices, liberal time payment terms, assured satisfaction. Get the latest 1953 ALLIED Catalog. Keep it handy -and save time and money. Send for your FREE copy today! EVERYTHING IN ELECTRONICS SEND TODAY FOR RADIO'S LEADING BUYING GUIDE ALLIED RADIO World's Largest Electronic Supply House EASY -PAY TERMS Take advantage of ALLIED'S liberal Easy Payment Plan -Radio's best terns -only 10% down, 12 months to pay -no interest if you pay in 60 days. Available on Hi -Fi and P. A. units, recorders, TV chassis, test instruments, Amateur gear; etc. TV & HI -FI SPECIALISTS To keep up with developments in TV and High -Fidelity, look to ALLIED! Count on us for all the latest releases and largest stocks of equipment in these important fields. If it's anything in Television or High - Fidelity equipment -we have it in stock! IL ALLIED RADIO CORP., Dept. 1 -D -3 833 W. Jackson Blvd., Chicago 7, Illinois Name Send FREE 236 -Page 1953 ALLIED Catalog. Address City Zone.... State April, 1953
Page 1 and 2: T EVIS i N APRIL 1953 IN THIS ISSUE
Page 3 and 4: YOU PRACTICE COMMUNICATIONS with Ki
Page 5 and 6: I NOW...from D.T.I.s MILLION DOLLAR
Page 7: "I Read You Five." Welcome Words! H
Page 11 and 12: Get yourself on the beam to the BIG
Page 13 and 14: Look! New small size Adashaft Radio
Page 15 and 16: FETTER RECEPTION EVERY Ol oN 1111.
Page 17 and 18: A LOOK INSIDE PROVES WHY PAY A SERV
Page 19 and 20: TELEVISION RADAR ELECTRONICS RESEAR
Page 21 and 22: BETA RADIATION GAUGING METHODS By G
Page 23 and 24: would have in controlling the proce
Page 25 and 26: is done, the meter on the Microvolt
Page 27 and 28: I voltage regulation', '.'. as well
Page 29 and 30: DECAY CONSTANT IN VIBRATING SYSTEMS
Page 31 and 32: I I (5000), and Curie point* occurr
Page 33 and 34: COAXIAL CAVITY TUNING ELEMENT Fig.
Page 35 and 36: Make your U H F circuits as simple
Page 37 and 38: (// Capacitors shown 21 /7 times ac
Page 39 and 40: RCA N E E DS E NGI N E E RS who won
Page 41 and 42: O N FREQUENCY CONTROL FOR MILITARY
Page 43 and 44: i Gpoßt i. NOW YOU CAN 4 pvRAVE ti
Page 45 and 46: known as the 5894 -A, because the c
Page 47 and 48: Ticnife "FILTER DESIGN DATA FOR COM
Page 49 and 50: Converter Calibration (Continued fr
Page 51 and 52: For opportunities within your reach
Page 53 and 54: Sweeping the Country! Collins Audio
Page 55 and 56: ULTRA FAN series-Complete VHF -UHF
Page 57 and 58: 1 029 Leonard C. Lane, B.S., M.A. ;
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A Transistor of point -contact type
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PH I LCO TESTERS Now Yours on NEW S
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Mriiffffifff(i ( l ((( THE RADIART
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TRAIN FASTER- TRAIN BETTER- TRAIN E
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A ROBOT ELECTRONIC TURTLE Closeup v
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7. Solder to the ends of the Fa " s
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THE semi -automatic or "bug" key is
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' even a small wooden box may be us
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Fig. 1. The compact, versatile mobi
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access to a surplus TU -10-B tuning
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CHANNELS Pertinent frequencies and
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quency definition probably wasn't n
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conicals are usually stacked two or
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THE U T SPEAKER ENCLOSURE Design de
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a drop of 6 db -per- octave above 5
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Fig. 1. (Left) Front panel view of
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Fig. 3. Bottom view of the 30-watt
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A LOWR[SISTA NCE OHMMETER _ By J. P
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By HAROLD HARRIS Vice -President, E
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erticle, the results are not too fa
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Sete/t SHORT -WAVE Compiled by KENN
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dual triodes with the necessary int
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You, ecutiAtea a &LtAufoP4Lo ctZ& b
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The data that Launched Thousands of
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Te MANUALS SHOW YOU HOW. Here is vi
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NEW WIDE BAND VERTICAL AMPLIFIE Dir
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Indicates frequency of energized ci
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NAL TRACER KIT OCATOR AND WATTMETER
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Mod.loied or nwdc kited RF output.
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SUPERHETERODYNE High gain dual iron
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H. D. Suesholtz, General Manager, T
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It will count events occurring eith
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1 EE101so Mc, MAIL YOUR ORDER TODAY
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Which Yo Want? Guet your FCC Ticket
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Code Practice Oscillator (Continued
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. =Ms or ...eel, u ' tically. topla
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1 II{ Phono Equalizers (Continued f
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1 BA" None None Top Top THE BEST IN
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What's New in Rac io (Continued fro
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denser (Admiral par number 65B6 -26
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Antenna Measurements (Continued fro
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impedance" and is an import ant con
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allo is French session 0630 on 15.1
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NEW TV PRODUCTS On The Market "TELO
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entire u.h.f. band. A sin ;le switc
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layout charts and floor arrangement
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Fringe Antennas (Continued from pag
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a theater TV in the frequency spect
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Receiver Change s (Continued from p
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:nrh BF "BASIC ELECTRONIC TEST INST
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B2 IT'S TERRIFIC! Fig. 3. Circuit t
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h' SGP1 7867 Within the Indust.), (
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VARIABLE PULSE LIGHT SOURCE HUNGER
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completely new system of closed con
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p ice businessman sells time, know
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It is apparent from the information
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1 -Improving Ir71 vision Technician
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