P

I *i i lui 11 y Htlih I .11 (kj FH il A mum t F Id DnV Ii x * i im ( l.HIM lii-un * * * cnly mrriiA Jkpa iiin r*'-N rjVLjf i Resistors available in standard values - T, watt - 1 O r 4.5c each, 4.25e muliiptes of 20 per value, 4.0c multiples of 100 per value, SASE tor free price list, tf we don't list it, request itr we'it get it. Connects to r e e i v e r 'phone jack. Drives stereo h jidphones Simulated stereo technique filters out OftM but lets you hear off-frequency amwtM to your CQ's....

B

2 metti powef amfi kit Hv irr 2StA) out with solid state switching, case, ccmnectnis 50.95 .tud 40uu out - relay swttcJtinp . 59.95 dnd 1 Bw ciut - less case, conrli ttijr,i and similar tn PA144 15 for 229 MHz 30.95 jawei am j sutiiIai to PA 144 15 except lOw and 432 MHz 40.55 amp factorv wited and Lusted . 1 9.ib imp - lattery wrted and tisteti , . 159.95 2 meter - 2w - 4 channel - hand held xcvi with cryiWls loi 146-S2 CQtflf> lett (Lets crystals) repeater 2211 MHi - I 5uu -ctlmpletede...

Any Diode

Needing an 1800 Hz lone burst to acLess a local repeatef, 1 turned to my faithful junk box. The most likelv prospect was a 556 LC dual timet thai I got as a fret simple from a manufacturer (a great way to get I oi 2 pieces of a pLirt hoc, especially 1 you have Ictterhead)- The firs I hall ol the IC is used as a monostable with an on lime of about 400 ins. The second half is a free i mining oscillator which is disabled v j the low output ol timer The NPN nansi> tor amplifies I lie negative...

Digital Data Recorder

Computer or Teletype Use Up to 4800 Baud Uses the indusm standard tape saturation method to heat all KSK systems ten to one. No modems or FSk decoders required. Loads Sk of memory in 17 seconds. This recorder enables you to back up your computer by loading and dumping programs and data fast as you go. thus enabling you to pel by with less memory. Great for small business bookkeeping. Imagine A year's books on one cassette. Thousands are in use in colleges and businesses all o er the country , i...

I L

Locaiion when the read write (R W) line goe low. When the R W is hight whatever was previously stored will be present at the Doljt terminal when that address is again selected. The oscillator utilizes an 88 mH Loroid coil with two secondary windings. The audio outputs of the identifier are low impedance. With the component values specified, the tone is I kHz. The address counter consists of three 7493 four-hit binary counter chips, The reset lines are tied together and go to the complement of...

Pacc

Massachusetts Bicentennial QSO Party CQ Worldwide DX Contest - Phone iARS CHC FHC. HTH QSO Party ARRL Sweepstakes - CW European DX Contest - RTTY OK OX Contest ARRL Sweepstakes - Phone CQ Worldwide DX Contes - CW ARRL 160 Metef Contest ARRL 10 Meter Contest ARRL Straight Key Might station. Multiplier is number of different Flonda counties worked (max 67), Final score ts total QSO points times multiplier, FREQUENCIES CW 1807, 3570, 7070, 14070, 21070, 28070. A summary sheet is requested showing...

Looking West Visits An Open Autopatch And Vice Versa

Ever been visited by a repeater Believe it or not it has happened more than once around thisQTH and I have the pictures to prove it. OK . . to be honest only once did a complete repeater, along with the person that created it, pass by to spend an evening, that being abou three months ago when Mark WAGDPB stopped over to show me a new creation for 420. Got some good Color slides of that one and perhaps we can girt a covfir out of one oi them in the future* Maybe , huh, Wayne Anyhow, it was a...

1

Crystal Utter circuit Fi J is a PU2194 F ays tai titter or equivalent. Fig. 8. Crystal Utter circuit Fi J is a PU2194 F ays tai titter or equivalent. Keep switching the rf on and off so you make suie you have noise without signal, no noise with that way you don't accidental detune the thing way off frequency thinking you're ri ht on. Next peak the I-fs for minimum noise. Tunc up the front end by giving it a signal on cwo meters, a gdm is fine, and again tunc the front end for maximum...

New Tested G Ua Ra Nteed

Order R817 AM-FM Stereo Tuner & Amp , . 38,50 Order 2R817 Buy two and save more . . . .2 68.00 Shipping wt. 8 lbs, 12x5x7 deep. Viatron communications a dap tor with EIARS-232C connector output for 8 level seria ASCII, Includes wired and tested circuit boards, face p ate, cable and manual. PRICE 165.00. With purchase of Viatron 2111 System, only S65.00. Verada 214, 38 French St., Box 438, Lowell Ma, 01852 Tel. 617-458-3077 v i parts are remoi'iid from functioning equipment. Guaranteed...

Kahoolawe

L Repeater link interconnection. crater rim of that famous landmark on a frequency pair of 146,28 146.88 MHz, This is the major repeater for he island of Oahu and is linked to the other islands by the 450 MHz links previously mentioned. There is also a local repeater operating at 146.16 146.76 MHz al the University of Hawaii Manoa Campus but this may be discontinued due to lack ol aciivity. We could hope not as ii is a very nice repeater and easily accessible from the Waikiki area. There...

Know Your Neighbors

I recently had the pleasure of attending the first organizational meeting of the new Tri-State Repeater Council. This council, serving Metro pol tan New York, New Jersey and Southern Connecticut, has been formed to finish the ob that the now-de f unt t Northeast Repeater Association started. Under the very able direction oi Dave Minott WA2EXP (Trustee WR7ACD, MY City), this group is attempting to clean up FM in New York and the surround ing areas and keep it that way. The key to achieving this...

Transistors

Fifi Kilh rnTe. hole iin iTI d-dlt, PNP'S JUid NPN4 . 11.1 h. in thi' wir J* Ki-J K. -TLSlS Vm (mu ln M lurit s. Crit.Nv.4A2G 4 tnd Imrrf < l p Vvur ni- n m i *lJll Jll., JlijJl Ini llMiFf barrel mit 39 2n30ss hobby transistors Fr Kt Ur jnfl. thi-r klliHt rj iht ii'---It* BARREL KfT ft4 0 PNP NIC H - P O W E F* TRANSISTORS ' *-. H1 OH Iwril tLiir ti. CjLHrj 4iJ61S IT, RARREL KIT 43 BARRIL HIT 46 -, ITT GLASS 4000 O.E. WATT RECTIFIERS jf, -AMPLIFIERS I E m* lXtOrtO LirnA **t ni T rd ir 1 jr*....

NC

Schematic of the inexpensive frequency standard using readily available parts. Please put my name and the names of the organizations 1 represent on the list of available and eager ham radio teachers. Steve Gold WB80JF Prestf Beach wood A. R. C, SecyJr South East A. R, C. 23881 Bryden Road Beachwood OH 44122 would appreciate knowing of anyone in my area who would be interested in helping me on the road to becoming a VE3. Tim Molyneux 31 Grass Point Cres, Etobicoke Ontario M9C-2T9 Would...

Six Digit Led Alarm Clock

Thousands of hobbyists have bought and built our original clock kit and were completely satisfied. 8ut we nave received many requests for an alarm clock kit with the same value and quality that you have come to expect from S.D. So, here it 1st THE KIT INCLUDES 1 National MM5375 Alarm Clock Chip 6 Hewlett-Packard .3Qin< common cathode readouts 15 NPN & PNP Driver Transistors 1 Etched and drilled PX, board 2 Push Button Switches for time set 2 Slide Switches for Aiarm Set and Enable 1 Filter...

Shot Down Again

In the interest of fair piay and downright revenge, I am writing and documenting the below information concerning unethical business practices on the part of one of your former advertisers in the hopes that others will be spared the frustration, mental anguish and expense I have gone through. On 14 March 1975, J placed an order with Trigger Electronics of River Forest, Illinois for a Drake low pass rf filter. Being a patient person, I waited Ax pec ted I y until July lor my filter. When it did...

Raoid Amateur

925 Sherwo< nl Drive Lake Bluff IL 600-1-1 Order from your fawrttc e Ire t runic* iikvr or dinct from the publiMht'r All direct order* atiii fi.00 stupftittti and hamt inn fit r Call& oa*. An upside down view of the C egg HT-146 shows how it looks on the operator's belt. that you can carry with you around the yard, garage or basement to keep up with what the rest ot the gang is doing. If you are gotng to a swap-and-shop or hamfest, they come in very handy For Civji Defense, RACES, ARFC...

Itu Preparations

Past amateur preparations for Inter national Teiecommunications Unron conferences have been less than minimal, despite 5100,000 being set aside for just That use. We wen into Lhe last big frequency conference in 1959 with virtually no planning and with no requests for more amateur bands which could then be used as bargaining chips Through an incred jbfe lucky fluke. U.S. amateurs did not lose out thiit time. The more recent satellite ITU con ferertce had most as much planning and the end result...

Stereo Cw Filter

YOU ASKED FOR tft ECM-5B FM Modulation Meter M rli rinnintftirtl nri iPHpnn riU OfK iBt t l amp Q0 WHr Cmuii CmnirflNed Nk ny viincptiun Tjtitaprt trttenni Ml CAD power pat 20-46 Chif git S29 95 Auffco tCap juTpur mih N 3honf S1 2 9z chue. ar Ortcv QfJer far OQ p Uk 1 30 i Of itnupmu IndPiin. rvfl nnti add 4 Hes n,i- CryKTall iv 14G.94 MH 3.i gt 6 All othiff treg. S7.ID, chue. ar Ortcv QfJer far OQ p Uk 1 30 i Of itnupmu IndPiin. rvfl nnti add 4 Hes n,i- CryKTall iv 14G.94 MH 3.i gt 6 All...

Vector Wiring Pencil

Jin-CL Sfldpara JH OTJ. AJjtotfl AM I rjrc - f. CftJ HI Iff Tili Mm-Jflii im hin AvAH flLfHP - '.'J- JOLT Knuiri S J GflHaiiU iif.iij1 'i.m i Ml cod nirtsniUDU naid toJtmrttv. EuttitpcetMryHsrtmiiUlM utiM. iannadnrt, DiiltpacHii.Hamwar nit .V WlMl t IK , . Jis F F3P. IHKDJTi f n Ti HT fc- tHOuiRQd JOLT LW H IC I lt Sametaii4i TTwanton. 'irt.T ii our i T r a nvr irH fiiiwi II . F - J li 1 or. Ofio wdos liun P h aiDD .'if fli l.i murm Qann'T Tv hnvltlfiM b rvtnird . LECh....

Ubw

Fig, 3a. 565 PLL as an FM demodulator, pass filter gets rid of the fQ fref component which exists, I hesitate to give exact block diagrams of synthesizers as work still continues on their design. 1 have seen and used many good ones, both home brew and commercial. But all leave something to be desired. This is not meant to be a criticism but a push for all experimenters to improve on current designs. PLLs can also be used for AM demodulation, By using a special VCO or RC phase shifter network...

Info

It solves all of these problems and lots more. And best of all., . the TS-700A reflects the type of quality that has placed the Kenwood name out front. Operates all modes SSB upper amp lower , FM, AM, and CW Completely solid state circuitry provides stable, long lasting, trouble-free operation AC and DC capability Can operate from your car. boat, or as a base station through its built-in power supply 4 MHz band coverage 144 to 148 MHz instead of the usual 2 Automatically switches transmit...

Microcomputer

For an up-to the minute source of microcomputer terminology and definitions, send for this Dictionary amp Guide AUTHOR Chartes J. Sipp and David Kidd Thts new microcomputer dictionary fills the urgent need for all communications people, computer people, engineers, scientists and industrialists to become quickly familiar with the terminology and nomenclature in a new revolution in computer control capabilities, Over 8000 definitions and explanations of terms and concepts 704 pages relating to...

Tempo Al Vhf Linear Amplifier

Power output of 100 watts romj with only 10 wans nqm.1 in. Reliable and compact. please call or write for complete information. 11240 W Olympic Blvd., Los Angeles, Calif 90064 213 4 77-6701 931 N. Euclid. Anaheim, Calif. 92801 714 772-9200 Butler, Missouri 64730 816 679 3127 Pr lubftct to chjnEi ithout not it . lan Burn VE60B 16016 78th Avenue Edmonton, Alberta Canada T5R 3E4 Over the pasi few months there have been two antenna-building workshops sponsored...

Vsm

12 BIT CMOS MJCRO CPU IM61Q0 is a silicon gate CMOS, fully static, singie address, fixed word length, parallel transfer microprocessor using 12 bit 2's complement asthmatic. This processor recognized ihe instruction set of DEC PQP8 E The internal circuitry is completely static ,md will operate from DC to 4 MHz dock rate. Has on chip oscillator and clock or tan be driven externally. Operates from single 5V supply at less than 1 OmW, TTL compatible, Design Is optimizad to minimize the number o...

Far And Away The Best

Thought you might be interested in hearing the results of my letter about XU4XA that appeared rn the Nov Dec issue of 73. First off, I received several nice letters, but wander of wonders, WSJ TO now WA2SRU sent me a Xerox copy o1 one of my XU4XA cards and an original He had two - I worked him when he was in Columbus, Ohio in 1939. Then later, W3HTG, now W6HTG, and current chief operator at KPH, paid me a personal visit, and he brought me another XU4XA card, as he had two1 H was in Atlantic...

Most Popular Haiv Tower Ever

REQUEST NEW CATALOG OF TOWERS amp ANTENNAS For over 3 7 years HAMSt Write for Free Catalog and Wholesale Prices Our beautiful twin-cavity bandpass fitters provide EEi TT1 FCJfCr protection from receiving or adiatinr interference outside the Anateur band, el ininatlri desense and Intermod frtxn commercial slgnflIs w ii 1 e purifying your emissions and insuring against TVI. Bo 791. Jacfaton, Michigan 49204 317 767-22 9 WINNEBAGO 20-foot motorhome. Loaded with options. Hot and cold running water,...

Ff Outpvttgamt

2n5590 Circuits

Walter WT Pinner WB4MYL 7304 Lorenzo Lane Louisville KY 40228 anl to add a little more power to your TR22 Want to make this power package small enough to fit into the microphone pocket Wani to make the circuit board with tin snips and glue Y ES1 Read on , . . The Hi Lite am pi i tie i 111 describe is easily constructed, will deliver 15 Watts output with t Wall input and can be built for less than 10.00. The amp fits into the mike pocket of the I R22C nicel and incorporates a dc power plug for...

Ground Foil

Large- Grounding is available at the rear apron terminal trip. The lead for the squelch switch is provided by running a lead across the board to the foil side through a hole in the trame between the transmitter and the receiver circuit boards. I ind the foil that joins Rl 20, RI23r and the positive side ot Ct27 see Fig, 3 . Solder the lead here You ma use the lamp originally provided for the backlight, but it turns on and off rather slowly, so I feft it mounted in its clip in case I ever need...

Polymorphic Systems

California 93018 The IMSAI SOBO can toe confinured with optional Mother Bo id 1o provide full 22 sIoLv Uho nJ Heavy July power supply optional du af power supply shown I Ik IMSAI 6080 is dcsifjncJ u rnti the lull Intel lamtly of Ijr c scalc Integration l. jpi, tlujs providing fiiglt r l biJJty and Ftoh pjiiei plugs Mother Board, th eliminating the w soldering all the from the Iront pi to the Mother Bo Special PIO Board configured with LEDs 10 monitor each toil of each of...