Info

Radio Experimenter

J,bk well tom, last hrd hr was this was novice band - over to vt, w1ik de wa9vlk k wa9vlk de w1ik - u oms should read more - advanced and up got this segment yesterday - generals are 150 kc down, advanced and extra got upper 200 bk de w3byk w3byk de w1ik hw w1ik de w3byk - listening es hrd u all discussing band changes - new rules this morning gave techs this segment - extras are up 150, novices go 200 down and generals are 250 down hw - w1ik de w3byk k w3byk de w1ik - srj om fgne qrm -pse try...

Wpvf

Clegg 278 No. 27104-3498 Drake TR3 No, 12746A Collins 30L1 No. 29625 Drake TR22 No. 620272 VHF Eng. 1501 amp Std. 826M No. 203085 Motorola Motran VHF Trans Serial No. DG153W SBE SB-144 2m FM Trans Serial No 720087 Varitronics HT-2, 146.97MHz Serial No. 640256 Unimetrics Ultracom 25 Serial No. 090561

Timers And Counters

A flexible 24-stage ripple binary counter, and a real time 5-decade counter have been introduced by Motorola< Capable of counting from 1 to 22 the MC14536CP PROGRAMMABLE TIMER consists of 24 counters with the last 16 stages seiec table by a four-bit select code. Real time event counting can be accomplished with the MC 14534CL FIVE DECADE COUNTER in continually update multiplexed displays. By varying the input clock frequency of the MC14536CP Timer a wide variety of timing intervals can be...

A

S repeaters become more and more sophisticated, the main method of control seems to have standardized around the Touchtone pad- These devices are available from commercial outlets and the friendly 'Phone man, Cost varies and depends upon the source they can be free or up to 25 for the sixteen button computer console model. Following are several circuits for using the pads

Rii

These connections are just one method for mating the synthesizer to the HT-220. The output of the VCO is buffered first by IC 62, a quad-NAND gate. One section is used to drive the digital mixer. Two more sections are used as switched amplifiers to drive the transmit buffer and the receive tripler. A 2N3512 was used as a buffer to drive the first tripler stage of the HT-220 transmitter. The 4 MHz output is tripled in an MPF102 stage before going into the receiver...

Ts

Kenwood's go every placc H , - do everything transceiver The new TS-520 is the transceiver you have wanted, but could not buy until now. It is a non-compromise, do everything, go everywhere 5 band transceiver for SSB or CW that performs equally well at home, in an automobile, airplane, boat or trailer. The TS-520 features built-in AC power supply, built-in 12 volt DC power supply, built-in VOX with adjustable gain delay and anti-VOX. The price 629.00 The R-599A is the most complete receiver...

Neon

L This is all you need for a sensitive rf indicator. The neon was a small one from a worn out soldering iron. Any neon will work, though the type with two small, nearly parallel inside electrodes (NE-2) seems best. The piece of insulated tube is only to cover joints and form a handle. Operation ought to be tried before finally sealing up the resistors. The idea is to use very high values, so that the neon barely glows with no rf nearby. I he resistors need not be of the same value, and...

Reciprocal Licensing In Israel

Valid license from his own country can receive an Israeli license. At the time of government examinations, he will be questioned in those specific areas where it is felt that the technical level in his own country is lower than in Israel. Decisions regarding the technical levels wilt be based upon a comparison of the syllabus from the amateur's own country to the syliabus in Israel. An amateur who does not psss the examination, or decides not to sit for it, will automatrcafly be issued an...

Cricket Electronic Keyer

A popularly-priced IC keyer with more features for your dollar, Cricket 1 is small in size and designed for the beginner as well as the most advanced operator. It provides fatigue-free sending and its clean, crisp CW allows for easy copying at all speeds. Turned on its side, the Cricket can be used as a straight key for manual keying. Right or left hand operation, AC DC. Shipping Weight 3 lbs. 49.95 OTHER EXCITING PRODUCTS INCLUDE TOUCHTONE TO ROTARY CONVERTER TOUCHTONE TO TOUCHTONE CONVERTER...

Sdf

Please add 5k to 12 V, .01 to ground io poini B of oscillator. was very stable and tuned well as shown in Table 4. i his is always nice because it takes up little space, is easily adjusted, and doesn't cos anything. You also avoid more trimmers, which are quite large compared to the transistors being used. You have to be sure it's working though. You don't always get Hie best match with such a link. A final trim-up of the osciiiator input link L5 placed its three turns of...

What Interference Is

The AR-2000 is a completely solid-state, dual-channel communications receiver with 0.15 uV sensitivity lt 10 dB S N N and selectivity that renders it virtually interference-proof more selective than you ever thought a receiver could be . Blocking, intermodulation, adjacent-channel and crossmodulation rejection characteristics are better than any other receiver on the market and are typically beyond the scope of measurement. This plus modular construction digital frequency readout all bands...

To Digetal Mixer

Reference divider chain, Pins 2, 3, 6,7, and 10 of JC12- CJ4 are grrounded. Pin 10 of 1C15 is grounded, AH IC'shave pin 5 connected to 5 Volts. not key and the digital display is blanked should an unlock condition be detected. The VCO consists of a Motorola MC164SP, using the essential ideas from K20AW's article, Some changes were desirable. The varactor diode used at D1 was from a five-pack found at Radio Shack, A variable capacitor is used at CI When the control line on the base of Ql...

Input

TO PIN 9 , lC23d TO PI M 5 , fC 30c Fig. 4, Wiring of the Program-Operate switch which connects TT-pad switches to either the BCD encoder or the pad. The MHz switch sets iC 18 to the proper divide number. In the 146 MHz portion of 2mf pins 15 1, and 10 are grounded and pin 9 is at 5V, giving a preset count of 8. The remaining parts of the number N are set into IC 16 and IC 17 by either the memory or the scanner. In transmit, pin 1 of IC 19 goes low and pin 10 goes high presetting IC 19 to 5....

Veazg

Vf lk Sco KSDIZ 731S Hollywood Driv W it Chesrer Of J J 69 Vf lk Sco KSDIZ 731S Hollywood Driv W it Chesrer Of J J 69 Thanks to the response of several of you readers, I have been selected to provide you with a monthJy update on the world of solid state electronics. While I may have my ideas as to what types of circuits and devices you are interested in hearing about, I would greatly appreciate a short note, dr even a QSL card, listing your solid state and experimenting interests. With your...

Wilson Duo Band Beams

6 ELE. 20 amp 2 ELE. 40 INTERLACED BEAM, Gain 13 DB 20 5,5 DB 40. Boom length 50 ft, 3 OD ,200 wall to .065 wall. 5 ELE. 20 amp 2 ELE. 40 INTERLACED BEAM Gain 13 DB 20 5.5 DB 40. Boom length 40 ft. 3 OD ,200 wall to .065 wall, 5 ELE, 20 amp 4 ELE. 15 INTERLACED BEAM Gain 12 DB 20 10 DB 15. Boom length 40 ft. 3 OD .065 wall. 4 ELE. 20 amp 3 ELE 15 INTERLACED BEAM Gain 10 DB 20 8.5 DB 15. Boom length 30 ft. 3 OD .065 wall, 3 ELE. 20 amp 2 ELE. 15 INTERLACED BEAM

Knza

73 Magazine is published monthly by 73 hie., Peterborough New Hampshire 03158, Subscription rates are S 7 for one V ear in North America and US. Zip Code arc as oeerBeaji, H per year elsewhere Tiro year 12 and S13 overseas Thre years, S i and S I ft overseas. Second etas postage paid ai PetcrhQrou amp K Sea Hampshire 03 158 and at additional mailing Offices Phone 603-92 4 3873. Microfilm edition of 73 available from University Microfilms. Ann Arbor MI -IHIOfi Magnetic topes available from...

Light Tight

SjmpJe Visual Coupler SSTV converter. 0K2PAD's homebrew monitor Note-the outstanding workmanship. your regular TV and you can view large, bright pictures, Nice, eh Slow Scan TV activity in Czechoslovakia appears on the upswing, as reported by Franta, OKIOO, There are approximately 15 stations presently active on SSTV, with around 35 more interested and due to have gear going soon. The more active stations include OK1GW, 0K3ZAS, OK2BNE and OK 100. Their most popular frequency is 14,230...

S

Fig, J, Button locations and the corresponding audio frequencies produced. Fig, 2. Mike's WA4HQW circuit. Adjust lk pot for clean non-distorted tones. Then adjust 1 meg pot for correct amount of audio to transceiver. HINT Mike's pad worked with a 330 ohm fixed resistor for the ik pot Fig. 4. There are two different wiring configurations for the pads. Pads made by Automatic Electric have one color code and pads by Western Electric, ITT, Northern Electric and Stromberg Carlson have a second code....