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= M. For center scale reading we have A= i. /i, =t /z and RM RM X (1 -t) (R +M) R + M Since R must limit current to give full scale deflection when terminals are open- circuited, we have E i, _ R+M whence: R= E -M (2) i. For the next lower range R must limit the current to 10 i. with meter shunted by S. Therefore E MS R 10 i M + S 10 and similarly R, = R /100, etc. The lowest range is determined by the allowable battery current and the sensitivity of the meter. For this in- termittent use a current of 0.5 ampere can be delivered by three flashlight cells paralleled. However, new batteries should never be paralleled with old -the new ones will discharge through the old ones. Regarding calibration of the meter scale itself, the easiest and most practical method is to mark the scale directly using resistors of known values, preferably a decade resistance box; however, if such is not available a satisfactory calibration is possible from formula (1) given previously, noting that: A = do = RMX . . . (3) R +M +X for the highest range, i.e., where no meter shunt is used. If this method is used, the value of R actually required to zero the meter on the x10 range should preferably be used. -S- TUNG- SOLstatistical quality control methods produce the industry's most reliable tubes for all uses. Tung -Sol makcs: All -Glass Scaled Beam Lamps. Miniature Lamps, Signal Flashers, Picture Tubes. Radio, TV and Special Purpose Electron Tubes. TUNG -SOL ELECTRIC INC. Newark 4, N. 3. Sales Offices: Atlanta, Chicago, Culver City (Los Angeles), Dallas, Denver, Detroit, Newark FM RECEIVER TUNING INDICATOR By HARRY R. HYDER the advent of FM broadcasting. SINCE there has been a real need for an effective tuning indicator for FM sets. How many times have you thought you had your set tuned properly, only to be annoyed by ignition noise from some passing ear. You rush to the set to retune. but by the time you reach it. the car is gone and you are as nu ch in the dark as before. On weak stat' s particularly. the "no noise" point is very sharp. A zero -center microammeter is fine but extensive and it can only be used with the Foster -Seeley type discriminator. various types of `magic eye" tutus suffer fr lack of sharpness and other faults. N of them will work with the gated -beum tube (6ßN6) type of FBI detector. The toting device to be described is absurdly simple. is equally effective with all types of FM detectors. and costs practically nothing to build. Furthermore, it is foolproof. since it attacks the problem directly. Fig. 1 shows a simple blocking oscillator, using a war- surplus blocking oscillator transformer. The output is loosely capacity coupled to the antenna input of the FM set. A few turns of wire around the twin -lead is usually sufficient. Plate voltage is applied to the oscillator through a door -bell type push -button switch. Just tune in the station you want. push the button, tune to the noise null, release the pushbutton, and you are tuned in as well as you can possibly be. A blocking oscillator generating a short pulse with a fast rise time puts out a fairly uniform noise spectrum throng' t the v.h.f. reg. . The fundamental repetition rate of the oscillator, which is in the audio region, gives a tone to the noise. You can get the same results by using your electric razor, or an ordinary door buzzer should work, due to the sparking at its contacts. The blocking oscillator has the advantage of being silent. Both Utah and Raytheon transformers have been used successfully. Although it has not been tried. there is no reason why one of the old style TV blocking transformers should not work, with suitable values of It and C. Fig. 1. Two simple blocking oscillator circuits used to tune FM receivers. (A) uses a triple-winding type of transformer and (B) a two -winding one. B. 100 -250v B IDO-300V - PUSH BUTTON SWITCH PUSH BUTTON SWITCH lyld MEG 470 pet OUTPUT MEG ÿ7O ud 4. II e22yy1d. TO FM SET TUNG -SOL RADIO, TV TUBES, DIAL LAMPS ADJUST OR DESIRED TONE A) ANY SMALL TRIODE ADJUST FOR DESIRED TONE BI ANT SMALL TRIODE i 148 RADIO & TELEVISION NEWS
h' SGP1 7867 Within the Indust.), (Continued from page 26) of a special committee of the Technical Products Division calling for expansion and reorganization )f RTMA to provide greater recognition for manufacturers in the advarced electronics field. The major recommendatiois of the committee in charge of evaluating the report included: 1. RTMA ciange its name to the Electronics Manufacturers Assn. or some similar name; 2. a division for manufacturers of advanced products be established; and L the engineering dept. be expanded to cover advanced electronic products Future action on these )roposals will be reported as soon as s Ime definite step is taken. HAROLD * * * P. GILPIN has beel named general sales manager of the radio tube and television picture tube divisions of Sylvania Electric Products Inc. He will make his headquarters at the company's executive of ices at 1740 Broad%ray, New York City. He will supervise the sales program for the company's products rianufactured in the ten plants of the iivisions located in New York, Penn::ylvania, West Virginia, Ohio, Iowa, and Oklahoma. NEW OFFICERS NAMED THE San Ant Radio and Television Association, Inc. selected its new officers for 195:3 recently at a business meeting following the annual lunquet at the St. Anthony hotel in titan Antonio. The new president is AI Niehaus, vice- president is A. B. O'Kcef , secretary is Forrest L. Baker. and trc:Isurer is T Boyd. In addition. a new IN1ard of directors was chosen. The Association, which has I een operating since 1949, has adopter a code of ethics to assure customers the utmost in dependable service. Eat t member of the group display's a larg poster with the code in full view of his customers. Two technical sessions and one business session are held each tut by the group. Invited to the technical sessions are the associate members of tI e Association consisting of shop tech:ticians, students. and other interested Persons. Presently. the complete television course developed by Philco is being given under a competent instructor. The G -E fundamental and at vanced course in television service was given previously. The business sessions are lurIL ely devoted to business problems aris ng out of the day -to-day operations of the service dealer. A booklet entitled "Interesting Facts About Your TV Set" is made available by the .Association for distribu :ion to customers in addition to many advertising aids. April. 1953 29¢ 6A56 49¢ 65L7 69¢ 6F6 V TUBE PRICES ir SLASHED! 5/./.91 39° gss GT 211F7T 1629 617 65127 125117 125.17 GT ,2X8 13567 OT 6597 .OT 12SÁ7 12597 59¢ 5W4 6F811 2526 GT 6N7 GT 1616 65a7GT I 6 293 6V6 GA 826 5703 $2 I 2021 12ÁM7 837 5763 594 GY 2807 884 SI 73 1613 86 GT 66157 104ÿT G 5 6RC ST 99° G /D 958 1005 9004 lfl 01.8020020 7FBG 2 V 3926 91.67 514 SASS 1111 S670 xArí CATHODE RAY TUBES 9.29 357 1.29 5FP7 1.29 1 5.29 3Á61 6.29 3.167 9.99 5FP7A 2.29 120P7 9.99 3P1 3.29 5861 3.29 1 38614 3.29 9.99 ALL TUBES 51164 3.29 5891 5.29 3061 3.29 5061 3.29 561.1 9.99 GUARANTEED 2127 9.99 2132 29.99 2J33 19.99 19.99 XJ46 Minimum Order, $2; Cash with Order; Tubes Guaranteed; Semler BUYS & SELLS All Electronic Equipment; Write Right Now! 'Ii'LC// MAGNETRONS & KLYSTRONS 2.155 69.99 2845 99.99 706CY 2.156 129.99 J31 79.99 706FY 2J61 29.99 150 129.99 725A 5.9'1 21252 169.99 2628 19.99 I 0 ORDER TODAY! / 16219 TRANSMITTING á SPECIAL PURPOSE 1938 19.99 250TH 14.99 832* 8.99 1941 39.99 527 9.99 849 19.99 1880 59.99 WL632A 14.99 951 ... .....39.99 2CS1 .99 7158 6.99 961 9.99 3824W 5.99 715t 19.99 3022 59.99 723A 1.99 ASSOCIATED INDUSTRIES, Inc. 6855 Tulu P cod, CHECK JSC for COMPLETE 300 Ohm TV Lead -In Wire Needs! 22 Gouge Copper 20 Gouge 9 Copper 40 mil 55 mil 40 mil 55 mil 70 mil 70 mil 80 mil 100 mil 80 mil 100 mil 4-Conductor Rotor Wire Perforofed 300 Ohm Open Wire JSC has highest quality wire at lowest possible prices. Lithographic spools of Orange q and Blue individual) y packed 1000 feet to the metal spool. P ik. See your nearest displays the \SION TQ qNs AUTHORIZED tr O DISTRIBUTOR 'Le Z n D V i y .C/ 300 OHM TELEVISION TRANSMISSION CABLES U4U Iffy a BESS ß :-D 4C35 19.99 813 9.99 Tubes Guaranteed SC22 24.99 929 7.99 6C21 19.99 8299 9.99 CRTSTAI DIODES íN]1 1.19 IN2]A 1.99 11426 3 2g 6.99 1.99 16239 2.99 1627 3.99 1N21C 9.99 1N34 .59 TODAY! Calif. Phone: Stanley 7 -5458 133 e- JSC distributor who proudly Blue and Orange disc of qualify. I RADIO expert S C NG by ABRAHAM MARCUS - eo'tuthor of famous 'rElamants of Radlow / which has sold over 500,000 tools' Here is very detail you need to know 'Pout radio repair, replacement. and readjustment. Enny.to- understand. tepby -step self -training handbook shows how to locate and remedy defects quu ickly. Covers: TRF Receivers; Superheterodyne Receivers; Short -Wave Receivers and Converters; Multihund Receivers; Portable Receivers; Automobile a Receivers; Communication Receivers; F -M Receiv- -' ; Power Supplies operated from AC. DC, Batteries, Motor-Generators. etc. ` Tells you the HOW and WHY f: E1ae- Iron Tubes (Diode. Triode, Pentode, Beam Power. Thyratron. Phototube, Cathode Ray. etc..): Raetlfar Circuits Ifall -wave. Full-wave. Bridge. Volt- All in one gig age- Doubler, etc.). Dataetor Clreasy to retd, 16 Superrege I6 Big erative. Infinite-ironedonce. etc.): Amplifier Circuits IAuio, Radio, I -F, Video, D.C. etc.): Oseillater Circuits (Hartley. Col- Pitt s Crystal. circuittret. Multom- Chapters. 100 Sections. 400 ShowN Ow" Diagrams. 775 pages of ernetical radio instruction, hrmoq Sweep-circuit t I cull (Volume, DAVC, Toni NM Freq. Automatic Tuning. Automatic Frequency Con- t Explains how o 5e tasting In,trpm.nta such as; meter, vacuum-tube voltmeters, ohmmeters, bridges, ultimeter5: signal generators. tube heckers, cathcopes, etc. Over 100 pages and 69 his section alone! ode-ray oscillo illustrations in Get this autnorit below brings you days. tive radio repair handbook today! Coupon 8.010 Servicing on Fagg trial for 10 Mail it NOW. PRENTICE.HALL. Inc., Dept. M -RTN -453 70 Filth Ave., New York 11, N. Y. Send me. ('ir 10 DAYS' FREE TRIAL, "Radii, Servicing." by Abraham Marcus. I will return i1 in ten days and nay nothing -or keep it and send down (plus postage) and $2 monthly for 61.95 Name Address City 1 ) SAVE/ Send postage. State $5.95 WITH COUPON -we pa, 149
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T EVIS i N APRIL 1953 IN THIS ISSUE
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YOU PRACTICE COMMUNICATIONS with Ki
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I NOW...from D.T.I.s MILLION DOLLAR
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"I Read You Five." Welcome Words! H
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THE ONLY COMPLETE CATALOG FOR EVERY
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Get yourself on the beam to the BIG
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Look! New small size Adashaft Radio
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FETTER RECEPTION EVERY Ol oN 1111.
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A LOOK INSIDE PROVES WHY PAY A SERV
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TELEVISION RADAR ELECTRONICS RESEAR
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BETA RADIATION GAUGING METHODS By G
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would have in controlling the proce
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is done, the meter on the Microvolt
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I voltage regulation', '.'. as well
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DECAY CONSTANT IN VIBRATING SYSTEMS
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I I (5000), and Curie point* occurr
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COAXIAL CAVITY TUNING ELEMENT Fig.
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Make your U H F circuits as simple
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(// Capacitors shown 21 /7 times ac
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RCA N E E DS E NGI N E E RS who won
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O N FREQUENCY CONTROL FOR MILITARY
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i Gpoßt i. NOW YOU CAN 4 pvRAVE ti
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known as the 5894 -A, because the c
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Ticnife "FILTER DESIGN DATA FOR COM
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Converter Calibration (Continued fr
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For opportunities within your reach
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Sweeping the Country! Collins Audio
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ULTRA FAN series-Complete VHF -UHF
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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
Page 127 and 128: Code Practice Oscillator (Continued
Page 129 and 130: . =Ms or ...eel, u ' tically. topla
Page 131 and 132: 1 II{ Phono Equalizers (Continued f
Page 133 and 134: 1 BA" None None Top Top THE BEST IN
Page 135 and 136: What's New in Rac io (Continued fro
Page 137 and 138: 59 .n 89 60 .89 54.95 . .69 . 1.59
Page 139 and 140: a noted 0630 with news, strong leve
Page 141 and 142: Clearly ' lia) Radio France -Asie,
Page 143 and 144: le in any variable power supply, no
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Page 147 and 148: denser (Admiral par number 65B6 -26
Page 149 and 150: nllent 95 D.e.198 e B d. Adjust the
Page 151 and 152: Antenna Measurements (Continued fro
Page 153 and 154: impedance" and is an import ant con
Page 155 and 156: - 1 Junius Heard with news 0730 on
Page 157 and 158: allo is French session 0630 on 15.1
Page 159 and 160: v IlIllIllIlli IllIllIllIll
Page 161 and 162: NEW TV PRODUCTS On The Market "TELO
Page 163 and 164: entire u.h.f. band. A sin ;le switc
Page 165 and 166: layout charts and floor arrangement
Page 167 and 168: Fringe Antennas (Continued from pag
Page 169 and 170: a theater TV in the frequency spect
Page 171 and 172: Receiver Change s (Continued from p
Page 173 and 174: :nrh BF "BASIC ELECTRONIC TEST INST
Page 175 and 176: S0.62 f tical and easily- understoo
Page 177: B2 IT'S TERRIFIC! Fig. 3. Circuit t
Page 181 and 182: VARIABLE PULSE LIGHT SOURCE HUNGER
Page 183 and 184: completely new system of closed con
Page 185 and 186: p ice businessman sells time, know
Page 187 and 188: It is apparent from the information
Page 189 and 190: 1 -Improving Ir71 vision Technician
Page 191 and 192: i 2 Rate 50c per word. Minimum 10 w
Page 193 and 194: Assembling the components of Raythe
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