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THIS NEW BOOK GIVES YOU THE "KNOW -HOW" "UHF Converters" describes their design ... shows you how they work 44 pages 8112 x11 Covers 21 Converters and Tuners Cash in on the terrific expansion of TV through new UHF transmission. Be among the first to understand the design, installation and operation of the new UHF converters and tuners. This book describes all the popular converter designs and tells how they work with present VHF sets. Gives you the timely UHF information you want. Covers 21 converters in the following makes: Arvin Crosley Dumont G. E. Mallory Motorola RCA Raytheon Regency Sarkes -Tarzian Standard Coil Stromberg Sutco Sylvania To stay ahead in TV ... to get in on the ground floor as a UHF expert -you'll want this essential, profit -building book. Get a copy today! ORDER UC -1. $100 "UHF CONVERTERS," Only 1 HOWARD W. SAMS & CO., INC. one temperature during standby, and at another during transmission. As shown in Fig. 8, the transmitter is mounted so that by removing four wingnuts and pulling the power and antenna plugs, it can be easily removed from the car and brought into the shack for operation from an a.c. power supply. Thus it can serve as a standby transmitter to be used in place of the home rig or it can be quickly set up wherever needed to furnish communications during an emergency. A suitable power supply is diagrammed in Fig. 9. The Mallory 1B8R rectifier furnishes d.c. to operate the antenna relay inside the transmitter case. During a.c. operation, d.p.s.t. switch S., Fig. 9, is employed as a "send- receive" switch in place of the microphone push -to-talk switch. The lowest resistance that can be matched by means of a pi- network is equal to the tube load resistance divided by the square of the circuit "Q."2 Thus, especially on 75 meters, the final tank capacity must be rather high if the transmitter is to be capable of properly feeding the low antenna resistances often encountered in mobile and portable work. For this reason, a 140 µµEd. condenser is employed at C.,. Due to the capacity range of this condenser, the final can be resonated at undesired frequencies outside the ham bands unless a little care is exercised during the tune -up process. When operating on 75 and 40, the final should be dipped by tuning from maximum to minimum capacity, while on 10, 11, 15, and 20, adjustment should begin from minimum capacity. The procedure for tuning the rig, once it is installed in the car, is as follows: Throw bandswitch S, to the desired range and open 8,, the "tuneoperate" switch. Close the mike's push -to-talk switch and tune the v.f.o. until the oscillator can be heard in the receiver at the desired frequency. Close S. and make sure that both loading switches, S. and S., are also closed. Set loading condenser C. to maximum capacity and tune plate condenser C. for a dip in brightness of the screen indicator bulb, PL,. Open loading switch, S,, and redip the final. Open S. and, if possible, again redip the final. With some combination of the settings of Ss, S. and Cs,, the dip in brightness of PL, will be barely perceptible. A measurement of cathode current at this time should result in a reading of between 50 and 60 ma., a suitable operating value. Heavier loading of the final will cause the power output of the rig to drop. Although the foregoing instructions appear somewhat complicated when set down on paper, after you've gotten used to operating the rig, you'll be able to scoot up and down the dial in nothing flat. Of course, it will take a bit longer to go from one band to another, depending on how much time is required to change antennas. Once you have a bandswitching v.f.o. rig up front, you'll wonder how you ever got along with that old fashioned crystal job in the trunk. The ability to zero beat the other fellow really makes a difference in the ratio of calls -to- stations worked. Furthermore, when you can switch from one band to another you'll just about always be sure of finding some portion of the spectrum where there are plenty of hams to talk with. Build a rig like this one and you'll be able to say goodbye forever to those "Dead Band Blues." REFERENCES I Scherer, W. M.; "The TV2AEF Mobile Special." CO, May 1952. 2 Ifruenc, Warren II.: "Hose to Design P.F. Coupling Co vials," Electronics, May 1952. Fig. 9. An a.c. power supply for portable- standby operation of the mobile transmitter. The terminal strip permits use with other transmitters. As in Figs. 4 and 5, the receiver "B- plus" is connected through the transmitter relay for silencing. L7; AC 111111110: SY3GT C TERMINAL STRIP TO FOR OTHER EQUIPMENT RECEIVER R+ Cu 11 o- s0I Order from your Parts ORDER Jobber, or write direct to TODAY Howard W. Sams & Co., Inc. 2203 E. 46th St., Indianapolis 5, Ind. 106 Send copy(ies) of "UHF CONVERTERS" $1.00 per copy. (check) (money order) for $ Name Address City State enclosed R,- 100.000 ohm, I a.. res. C, -20 Aid., 450 r. elec. cond. C '-25 old., 25 v. elec. cond. C -40 µ1d., 450 v. elec. cond. CH, -8 Ay.. ISO ma. filter choke Rect. -Low voltage rectifier (Mallory 1ß8R) REC 1,-Power trans. 350 -0 -ì5O k, I45 ma.; 5 +. @ 3 amps.; 6.3 r. @ 4.5 amps. T, -Fil. trans. 6.3 r- @ I amp. S,- S- p.s.s. switch S ,-D.p.s.t. switch SO,- Female cable plug (Amphem,l 78PFN Vi 5Y3GT tube RADIO & TELEVISION NEWS
What's New in Rac io (Continued from page 93) teed not to exceed ± 14 db within a reel and ± db from ree to reel. It is available in lengths o: 2400 ft. on the NARTB reel or hu 3 and in 1200 ft. lengths on the 7" professional plastic reel. All lengths arc guaranteed splice -free. COMMUNICATIONS RECEIVER Radio Apparatus Corp., 55 N. New Jersey St., Indianapolis, Inc. is now marketing a two -band cormunications receiver, the Model DIt200. This fixed and tunable combination a.c. receiver covers the 30 -50 mc. and 152 -174 mc. bands. Operatin ; in two pertinent fixed frequency ra iges, the tunable feature can be usid alternately. Under routine operating conditions the DR200 performs as any standard crystal -controlled monitor receiver. When conditions require and monitoring of any other channel or channels is desired, a flip -of- the -switc 3 makes the unit tunable across the full frequency range. HI -FI AMPLIFIER Precision Electronics, 91(1 King Ave., Franklin Park, Ill. has developed a new amplifier, the Mc del LJ2. This unit has a power out ?ut of 8 watts with 18 watts peak. D stortion at 8 watts is 11% harmonic and 4% intermodulation. Frequency response is ± 1 db from 20 to 20,000 cps at the 3 watt level. The unit has selector switches from radio channel to magnetic pickup, volume control, treble and bass controls. Complete specifications on :he LJ2 are available from the company. TOMORROW'S AUDIO TODAY! FISHER Master Audio Control AND 40 -Watt Amplifier THE FISHER Master Audio Control can be used with any amplifier. Intermodulation distortion is virtually unmeasurable; complete, professional phono equalization and tone controls; genuine F -M :oudness control; 5 inputs and 5 input level controls; cathode follower outputs. Self - powered. Brass control panel. Chassis, $89.50 With cabinet, $97.50 THE FISHER Laboratory Standard Amplifier Model 50-A is, beyond a shadow of a doubt, the world's finest all- triode amplifier -and yet moderately priced. FEATURES: High output - less than .3% harmonic distortion at 40 watts (.08% at 10 watts.) Intermodulation distortion below .8% at 40 watts. Uniform response within .1 db, 20- 20,000 cycles; l db, 5 to 100,000 cycles. Hum and noise better than 96 db below full output. Quality components, beautiful workmanship. $159.50 Write for illustrated brochure and full specifications. FISHER RADIO CORPORATION 39 E. 47th ST., N.Y. SLIDE SWITCH The Electronic Components :)ivision of Stackpole Carbon Co., St. Marys, Pa. has released an inexpensive, miniature d.p.d.t. slide switch rated at .5 ampere at 125 volts. The switch measures 1%" ong by 17,:.." wide by I " deep. It provides d.p.d.t. switching action in smaller size but uses the same mounting centers as the company's cony( ntional switches. Separate indenting for each pole assures positive yet smoo :h snap action. A special fiber -surface laminated Bakelite base reduces ars tracking and increases the safety f:Letor. April, 1953 107
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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
Page 83 and 84: conicals are usually stacked two or
Page 85 and 86: THE U T SPEAKER ENCLOSURE Design de
Page 87 and 88: a drop of 6 db -per- octave above 5
Page 89 and 90: Fig. 1. (Left) Front panel view of
Page 91 and 92: Fig. 3. Bottom view of the 30-watt
Page 93 and 94: A LOWR[SISTA NCE OHMMETER _ By J. P
Page 95 and 96: By HAROLD HARRIS Vice -President, E
Page 97 and 98: erticle, the results are not too fa
Page 99 and 100: Sete/t SHORT -WAVE Compiled by KENN
Page 101 and 102: dual triodes with the necessary int
Page 103 and 104: You, ecutiAtea a &LtAufoP4Lo ctZ& b
Page 105 and 106: The data that Launched Thousands of
Page 107 and 108: Te MANUALS SHOW YOU HOW. Here is vi
Page 109 and 110: NEW WIDE BAND VERTICAL AMPLIFIE Dir
Page 111 and 112: Indicates frequency of energized ci
Page 113 and 114: NAL TRACER KIT OCATOR AND WATTMETER
Page 115 and 116: Mod.loied or nwdc kited RF output.
Page 117 and 118: SUPERHETERODYNE High gain dual iron
Page 119 and 120: H. D. Suesholtz, General Manager, T
Page 121 and 122: It will count events occurring eith
Page 123 and 124: 1 EE101so Mc, MAIL YOUR ORDER TODAY
Page 125 and 126: 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: 1 BA" None None Top Top THE BEST IN
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
Page 145 and 146: . SI9.95 \I e \ With 1 \I I.IB . 1.
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 and 178: B2 IT'S TERRIFIC! Fig. 3. Circuit t
Page 179 and 180: h' SGP1 7867 Within the Indust.), (
Page 181 and 182: VARIABLE PULSE LIGHT SOURCE HUNGER
Page 183 and 184: 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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i 2 Rate 50c per word. Minimum 10 w
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Assembling the components of Raythe
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