## Bmm

Doppler-co meeting Mir repeater frequencies MHz) for ground use, alternative is to set a dual-band i2 meter and 70 cm) radio or scanner to listen on 145.55 MHz and 437.95 MH . The 2 meter simplex frequency has been active for man) years, and the 70 cm frequency is the Mir SAFEXT1 repeater output. At 70 cm frequencies Doppler shift is a serious consideration for NBFM (Narrow-Band FM) work. The app irent receive frequency at the beginning of a p iss will he as much will be necessary to...

## Hqb

+ 12 voil TT Batier> Radio Shock 23-154 1. Current range will be 201o 60 microamperes with o current limit resistor of 100K. 2 Current reversal time determined by CI and C2. 33uF 3 seconds, 47uf 5 seconds, lOOuF -10 seconds + 12 voil TT Batier> Radio Shock 23-154 1. Current range will be 201o 60 microamperes with o current limit resistor of 100K. 2 Current reversal time determined by CI and C2. 33uF 3 seconds, 47uf 5 seconds, lOOuF -10 seconds Fig. 3 Tom Miller WASYKN's revised and reduced...

## Swt

Either add or subtract 3W) in older to make the alue between ilSO1' If L > +180. then L L - 360 1 f L < -1then L i. + 360 One problem seen while calculating these values on a computer is the fact that in UAS1C the mji(X) and cos(X) cover different ranges (see Fig, 4), The sin(X) function returns values from 0 to 360 , while the costX) function returns aiues only over 0 to 180 . If Lis positive, then the result of Equation 3, bearing C. is accurate, but if L is negative then the actual value...

## Research

A lot of BANG for your thirty bucks, As we used to say in the Air Force, close doesn't count, except in three sports horseshoes, cowpie lights, and nuclear war. For us old Cold Warriors, it s a huge relief that nuclear war is less likely with every passing month. But we must still he vigilant my nuclear detonation could send us back to the Stone Age of radio, and we Morse operators may have another heyday. I, for one, will be prepared, because I have an Atomic Keyer from Embedded Research. The...

## Peaw

Confirming our OSO of fr Ul-----1 7 at J.y& GMT when yourngtiatJ were JT on the iJj tac band Input tro Antenna < S stfrTot p fctB _______ J SergL BOB WESTErfVELD OSL E-ezi ttCp*' r ngn TjiUlifcm - BcrttrvLa When Doctors Pons and Fleischmann, two respected chemists. stuck a palladium wire into a lithium and heavy water solution, and then passed a current through it for yome days suddenly the cell started generating far more heat than any chemical reaction could explai n. Other scientists...

## Dm I K

5 Set Speed dits down, dahs up & 3 Input DM1 Press 3 to finish 3& 5 Input DM2 , Press 3 to finish 2& 4 Toggle On Air Practice modes DMn represents the two dynamic memories, in which you can store message text and or your calisign. Where functions are shown with two button numbers separated by the character, you need to press both huttons si multaneously to enable the junction. An undocumented combination. 4& 5, makes the ke> er report its software version (vl.22 in the unit...

## So

On the cover VE6 Field Day VE6LHW, VE6LGP. VE6BJE. VE6SKT and VE6RHS in action. Photo submitted by Earl Grotzki VE6ERL. Feedback Any circuit works better with feedback, so please take the time to report on how much you (ike. hate, or don't care one way or the other about the articles and columns in this issue. G - great , O okay, and U ugh. The G s and O's will be continued. Enough U's and it's Silent Keysviile, HeyT this is your communications medium, so don't just sit there scratching your...

## D R

The level of RF their rigs are putting out. The combined RF wattmeter dummy load describes here < Fig. 1) is designed lo measure power levels between 1 and 6 watts of RK to provide an overlap beyond the 5-vvatt level in addition, the RF levels below 1 wall are not displayed, enabling the most important I-to 6-watt range to occupy about 95 percent of the meter scale. This instrument is easily calibrated with a variable DC voltage of about 9 YDC to just over 25 VDC, monitored with a DMM to...

## Mfjrib

Average Cross-Needle SWR Wattmeter, Shows SWR, forward reflected power in 2000 500 & 200 50 watt ranges. L8-60 MHz . Mechanical zero. SO-239 connectors. Lamp uses 2 VDC or 110 *39 MFJ-1701 MFJVI702B *59** MFJ* 1704 Select any of several antennas from your operating desk with these MFJ Coax Switches, They feature mounting holes and automatic grounding of unused terminals. One vear unconditional guarantee. MFJ-170L 39.95. 6 positron antenna switch. SO-239 connectors, 50-75 ohm loads. 2 KW PEP,...

## Mfj

Throw this tiny MFJ 20 Meter C V transceiver in a comer of briefcase and enjoy DXing am ragchew ing wherever you go. You get a high performance superhet receiver, crystal filter, R1L AGC vernier tuning, skietone, speaker, up to 5 watts output, serni full break-in, much more. Free manual. St& frve MFJ catalog for40 30, 17, 15 Meter versions, keyer, audio filter* power pack, tuner, antennas. World Radio TV Handbook says MFJ 1024 is a ' first rate easy-to- operate acme antenna.,.quiet excellent...

## Get The Atv

Snow free fine of sight DX is 90 miles - assuming 14 dBd antennas at both ends, 10 Watts in this one box may be all you need for local simplex or repeater ATV, Use any home TV camera or camcorder by plugging the composite video and audio into the front phono jacks. Add 70cm antenna, coax, 13.8 Vdc 3 Amps, TV set and you're on the air - no computer or other radios necessary, it's that easy TC70-10 has adjustable RF out 1 to gt 10w p.e.p. and sync stretcher to properly match RF Concepts 4-110 or...

M iropfocessof Control lor easy free M iropfocessof Control lor easy free programrmig using DIP switches. f gt o drtt. your signai roc sokJ afl the me just fie ajirmeraaJ siauors. Audio quality s excellent. connect o the lira output of any CD player. tape deck or mike mixer and you re on-the-air Foreign buyers witl Caribbean talks use a stole FM-25 ta cover the whole island1 appreciate the high power output capah ity oi the FM-35 many jar ipr 120 VAC. Kil comes compile with case set, whip...

## Info

Actual and idea resonant response. Fif J. Actual and idea resonant response. for a radio ai the right. The ideal response would be a rectangle, where all the signals within the bandwidth of lhe radio signal carrier and sidebands gel through equally well the response is 1 pf 100 amp , while nothing gets through above or below that range the response You can see there is a big difference between what we want and what we get. The ideal rectangular response at the right has 1, A flat top....

## Raibeam Users Say It

f'm impressed that the 2 element Ra beam averaged less than 1 S-unit down from my 30 boom, 4 element 20m quad on DX It receives as quiet as the quad and the F B ratio is excellent K5UA placed m the top 3 worldwide on J0m in the 7995 WPX with 400 tvaffs and a Raibeam at 45 ft ZL1AXB compared to the Raibeam my KT-34 seems like a dummy load ZL1SB only 2 elements and tt beat my Log-periodic on DX by 3 to 4 S-untts unbeitevabier W5CKP it s the best antenna i ve ever used in 50 years of Ham RadfO...

## Circle On Reader Service Card

Powm Hand Held Radios amp Cellular Phone For Hours. Mfl ST r.nihirt 4 aihj - fHtr hi 1 f - im r Iruft TW FBti F Barter cn p gt far dmi mm CcfTW wttn AC CMi-punr ft htf Cflp I ArnJt iF i In '. i . f c Hent For encles Field Day Weekend Trips c Hent For encles Field Day Weekend Trips Mfl ST r.nihirt 4 aihj - fHtr hi 1 f - im r Iruft TW FBti F Barter cn p gt far dmi mm CcfTW wttn AC CMi-punr ft htf Cflp I ArnJt iF i In '. i . f Y 1 1J4-K MUI I Chrtawarlli CA 91311

## Pw

Numbered terminals indicate connections 10 BASIC Stamp module. Through 73 I have learned about control circuits usinii devices like the 555 timer, counters, gates, and a diode main a type of ROM gt to serve as a controller and ID unit for experimental beacons and repeaters, i hen I read about a new toy thai I just had to get, Parallax Inc.'s BASIC Stamp, so I ordered one complete with the development system, from Digikey. Application Note 8, Sending Messages...

## Features

Colorado GRP Club s Field Day Operation - AAOXl improve your repeater system by buildtng new antennas for about A Versatile QRP Random-Wire Antenna Tuner - KB4ZGC A quick tva gt to tune ifp your QRP rtg m tne fiefci. A Mult band Trap Dipole Antenna System - KBKWD 77i s eassty constructed HF antenna system ts a perfect combo for use wtftportabierigs A sneaky debtee to make foxhunting even more fun. A Simple QRP Wattmeter Dummy Load - KB4ZGC OK, how many countries have you worked with 5W

## Ultimate Power

Paul Blum KF9GQ 1138 Cardinal Lane Green Bay Wl 54313 One of the main reasons I became a ham is ihat 1 love to build elec ironic gadgets. This hobby gives me plenty of excuses to build things to better equip my station, Sometimes the gadgets I build actually work, and occasionally 1 bui d something that turns out better than store-bought, Recently I was offered a broken UPS Uninterruptible Power Supply for the right price free , I gladly took ii, thinking of salvaging some parts and that maybe...

## End Of Detour

Let's now see how heterodyning is used in the superhet. As an example. Fig. 11 show s a superhet AM radio tuned to a radio station at H80 kHz. Coming in the antenna is not just this station, but also signals from ail sorts of other stations radio, TV. radar, etc. The tuned circuits in the RF section remove most of the un-desired signals, but not all, so that the signal coming into the mixer is mostly 880 kHz, but stiil has many other signals. The mixer is a nonlinear circuit it receives this...