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Messy and m ickey mouse, bu t wh en all th e jumper wires are connected and the zip -cord extensions are plugge d in, it really works. All tha t remains to complete the tra nsmitting side of the stage is a camera. T V cameras are available from many sources and range in price from approxima tely SSO for a used Jap came ra , to $300 fo r a new one, and $ 100 to $ 1000 for a goo d-q uality U.S.-made type. All of th e mo dern small transistor cameras produce enough peakto -peak voltage to drive th e modulator (about 2V). After you have the system on the air and are mon ito rin g, it's a good idea to sam ple so me of the rf t hro ugh a video detector, coupled to either a scope or a video mo nito r so that you can wa tch the off-the-air picture as yo u play wit h the bea m cont rol on the camera, the video mo du lato r gain co ntrol, and the tu ning controls on the transmitter. This will insur e that you are watching the actual picture yo u are transmitt ing, rather than an overloaded T V set which will tend to distort the picture. Incidentally , just conn ect a carbon mike to th e micropho ne input 0 11 the transmit': ter, as the strip serves for both FM and AM the fun ction of transmitti ng video and audio simulta neously on the same frequency. The separation of audio and video is done at the receiver. Receiver T he receiving setup is even easier to organize and get working, particularly with GE or RCA receiver strips. Very simply, it's just a qu estion of obtaining a crystal at 32 the proper frequency, plugg ing it into the crystal oven, ap plying voltage, and tuning the various stages for best received signal, or by letting anyone with a frequency meter and a signal generator t weak each stage for maximum. Ed. Note: T-445 can be a pain, though. Even though they're probably the best performance-wise, you may have a to ugh time ge tting the righ t crystal. Some T-44s use a 10 MHz crystal, others use a 30 MHz rock. And the actual cry stal fr eq uen cy will de pen d on th e f requ ency of th e second oscillator, which varies from unit to unit, A nice feature of the Motorola is that its receiver strips have an i-f output at 64 MHz, and through a coupling capacitor and with a small piece of coax (72,Q) you can pump this signal into channel 4 of any TV set and get goo d resolution and gain . A balu n at the TV set ant enna termi nals will transform the unbalanced 7S n up to 300 ,Q balance d , to match the TV t un er. This system will allow yo u to usc the squelch already on th e receiv er st rip so that with your TV Set off, you can always hear an ATV ' er break th e receiver. Incidentally,. vou can use t he transmit - receive relay alre ady inco rporated in th e transmitter strip , for one-switc h op eration or pu sh-to-talk, as yo u like. So , there it is, and inexpensive, reliable amateur T V syste m that many fello ws are using, and with which th ey are having the time of their ham radio lives. My own future plans call for co lor transmission with stereo so und and the use of video tape. A repeate r is now being built which will serve th e three-state area - so, as yo u can sec, th e action is there. All you have to do is get in on it. Any of the A'TV'crs wo uld be glad to demon st rate their eq uipm en t in operation as well as give you a hand wit h any pro blems you may incur. Don ' t let t his article be just another thing. Go out and get th e parts, pu t it together, and make it work. Then you will be ab le to get a goo d look at my secret ary , WB2PQZ. She's an avid ATV'cr herself and a real do ll .. .and she will be glad to give yo u a demonstratio n . . .. K 20JL· 73 MAGAZI N E
AMER ICAN MADE Mobile 2 Meter FM Transceiver He re IS what the 2 meter, FM Ham World has been asking for. RECEIVER The HR·2 receiver is a double conversion, superhetrodyne wit h highly select ive ceramic filter. Frequency Ran ge 144-148 MHz Sens itiv ity 0.35#-v (no m .) 200 8 Qu i et ing Selecti vity 60 B Dow n ± 16KC 500 8 Dow n ± 32KC Au dio Out put (3-4 !l Speaker).....3 Watts 10% Di stortion 5 Watts Ma xi m um Cha nnels 6 Cry sta l controll ed with pr ov ision for ad d in g an additional 6 ch annels I.F. Frequ encies.....10.7 MHz & 455KHz GENERAL Pow er Requ irements.13.6 Vol ts (no minal) Recei ve (squelched).l80 MA . Rece ive (Max. au d io output) 800 MA. Tran sm it M 2.5 Am ps (max.) Specifi cati ons: 90 day warranty TRANSMITTER The HR-2 transmitter uses phase modulation for t he ultimate in carrier stabi lity. Built in SWR load mi smatch circ uitry provides protection against open and shorted antenna condit ions. Frequency Ran ge 144·148 MHz Power Outp ut... Modulat ion l0 Watts (m in.) @ 13.6 VDC Phase Mod ulation w it h automa ti c dev iation lim it ing Devi at ion ; Aut omatic Li miting w it h lnt ernar ad j ust ments . from Q- 15KC devia tion Mic rophone Chan nels . STANDA RD EQUIPMENT Plu g-In , hand held, high Z Ceramic supp lied .....6 Crystal co nt rolled wit h indiv idual trimmer ca pac i tors for Freq uenc y netting Buil t -in 4" Speaker Mobi le Mo un ti ng Bracket 50-239 Antenna Connector Socket T & R Crystals fo r 146.94 M Hz PTT Ceramic Mi ke $22900 Amate ur Net onI Y ... :T in" in" " ~ " ~ ;:;" .. "... " ~ :T " -ẹȧ .. !:; il ... "- ~ . C"l '" .. " .. " ... .".. ṇ. ..~.. .. :T ~ ṇ. 3 ".ȧ ELECTRONICS, INC. 1900 Pend leton Pike, Indianapolis, Indiana 46226
Page 1 and 2: ~ ~ rrrw illrrrrrrW ~rrrw W~~ , •
Page 3 and 4: CONTENTS where. Then carne the day
Page 5 and 6: for ~ bo ut 10 years, has know n Ro
Page 8 and 9: :l Caveat Bmptor?r ~~~~~.~ ~.~~ *r.
Page 10 and 11: BOOKS I ADVAN CED CLASS STUDY G U I
Page 12 and 13: Irving M. Gottlieb W6HDM M~W 931 Ol
Page 14 and 15: situ ated on a PC board (Fig. 4) di
Page 16 and 17: See your DEALER for DRAKE products
Page 18 and 19: Practical circuit applications usin
Page 20 and 21: INPUT )1 c I SO MHz 1N4381 IOO~ 450
Page 22 and 23: The Mos t Powerful Signals Under th
Page 24 and 25: CA 3028 J.lL 923 '" 4.7 K ., 680 4
Page 26 and 27: K
Page 28 and 29: Theodore Cohen W4UMF 8603 Conover P
Page 30 and 31: ~ ~ Installation of the switch and
Page 32 and 33: A ~Sy CQ, CQ, CQ, t his is K3FEN, R
Page 36 and 37: The tuning indicat or shown in Fig.
Page 38 and 39: Being qui te activ e on two me ter
Page 40 and 41: "'12V "' 12-24V .60 10K lOOK .I IN3
Page 42 and 43: ON.. EFFICIENCY ORGANIZATION and MA
Page 44 and 45: Bill Hoisin gton K 1eLL Far Over F
Page 46: installation of on e or more low-no
Page 49 and 50: STEP UP TOTELREX Professionally Eng
Page 51 and 52: " 4 ~ O Y " 4 ~ OY ( I U 6 2 11 0'
Page 53 and 54: etter than the "Hot-Water 100 " ...
Page 55 and 56: y Ken W. Ses$ion~ K6MVB DU LD A 8 .
Page 57 and 58: Motorola HEP Semiconductor Devices
Page 59 and 60: see the A1ann for the best in USED
Page 61: esults. The transmitter adj ustme n
Page 65 and 66: What Is An Amplifier? Several acres
Page 67 and 68: When it comes to grea t used mo bil
Page 69 and 70: of am plifier o pera ting con ditio
Page 71 and 72: New advanced 4-band, Communication
Page 73 and 74: LI NEAR NON-LINEAR Radio Amateurs R
Page 75 and 76: 1. T he amp lifier is adjusted to o
Page 77 and 78: many do not) you can either speak a
Page 79 and 80: SOLID STATE ENCODERS for quick and
Page 81 and 82: WHEN IT COMESTO ANTENNA SYSTEMS...I
Page 83 and 84: Richard Tashner WB2TCC 163-34 2 1 R
Page 85 and 86:
A. E. McGee, Jr. K5LLI 281 5 Materh
Page 87 and 88:
John G. Harder W5QKO/AI4QKO 6200 A
Page 89 and 90:
The LOUJ-OhTn JJleter ALL RESISTORS
Page 91 and 92:
Photos I and 2 show the meter built
Page 93 and 94:
powers of ove r 100W across the ban
Page 95 and 96:
,r-"--'.N=;;EED AN ] CRYSTALS? PHON
Page 97 and 98:
4.000 BIT MEMORY D $8.50 from IBM C
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