Mzom

ZERO SPAM instantly ptees anaSyzer tn zero span n itxfe ami adrvates audio demodulator tor convenient monitoring SPAN conti ofs toe width of the spectrum being displayed and automatically solocts optimum resolution ftiier Largs bnghtscwen Ibroutdoot and indoot use Scale calibrated m 10dBoi 2 dB stops for accurate mp tam nwuiwvmeots 65 dB dynamic rarrg AVCOM s newest Portable Microwave Spectrum Analyzer, model PSA-65B, has an expanded frequency range from less than 1 MHz to 1250 MHz for the...

How to Make an Old HW

Gerald R Gronson K8MKB 3529 Belinda Dr. Sterling Heights Ml 48310 The next time you see an old Heathkit HW-8 at a flea mar kelt grab it. With maybe an hour's work you can put some pep into this old 'hot-water baby and have fun, Here's how I substantially improved one. In looking at the schematic, I could see that the receiver section was pretty good, but that the resistor and capacitor values were not the hest choices. I could squeeze better performance out of this puppy. Since the audio board...

Super JPole Antenna

Here's a simple, inexpensive one-hour building project. Marty Gammel KA0NAN 1703 Hewitt Ave. West St Paul MN 55104-1128 A local swap net helped me land an old Kenwood TH-31AT in good working condition. OK. now I needed an omnidirectional gain anienna. 1 found very few published 220 anrenna projects in the ham magazines, and even fewer commercial gain antennas available. That was no problem, since Y c made man> J-poles over the last 14 years. The Super J-Pole has about...

R

Ru and Rb form a bias network for C2C. Hmra. lefs sec, what else could 1 change IC2C looked like a goiKl stage to fiddle with. What about C3K and C42 Yep. changing them helped a loL Next came the IC1 stage, I tried several values for R14, which had been 100 ohms, settling for 180 ohms. Increasing RI4 much beyond 220 ohms causes oscillations. One more stage to go. The RF amplifier was the kicker. Ql, 417-169, is an MPF105 the worst possible choice they could have made for the RF...

Updrtes

In the March issue, page 77, column 2 paragraph 2 of Never Say Die' the telephone number for the SETI project was given as 800-AU-SLTL The correct number is 1-800-TAU-SETI. In the April issue, page 41, The Alpha Delia DX-A 160-8040 Meter Twin Sloper, the author's name was spelled John Stevenson. It is actually spelled John Stephenson. Oops In the April issue, page 33, ilAlaskan Amateurs and Their Amcnnasf Photo B , you may have noticed the striking resemblance between Chuck K7JUT KL7 in...

Info

For example, if an amplifier takes 1 volt in and produces 0 volts out. the voltage gain ratio would be 10, and so the gain would be 20 dB. As before, posilive values arc a gain, while negative values mean there is a loss. My students often ask why we use decibels at all, when we could leave gains expressed as ratios instead. The main reason is that it makes calculations aim easier when a signal goes through a chain of circuits, one after another. For example, suppose a signal goes through an...

Belcher Islands DXpedition

Winston Seeney VE3WFS 224 Cornwallis Court Oshawa, Ontario L1H 8E8 Canada If my wife could have seen mo ai that moment, she would have written me off is a madman. What teacher in his right mind would begin his summer cation standing with a friend au gt p ihe airport garage at Sanikiluaq.1 The arctic wind whipped our pant legs like Hags. The coax and guy ropes danced to iheir own senseless rhythm. From moment to moment, the precipitation switched luck and forth from rain 10 snow to rain seemingl...

Speech Scrambler

Descran s r-os saamfc systems heard on your scanner radio or set up your own scamptec communication system CFver trie phone or rat o Laiesi 3rd generation iC is used tor tan stic audio quality - equivalent to over 30 op-amps and miners' Crystal controlled tor crystal Clear sound with a built-in 2 watt airdio amp tor direct radio hookup For scramble systems, each user has a unil for full duplex operation. Communicate in privacy with the SS-70. Add our case set far a fine professional finish...

Mfjb

Uper DSP filter lutomatically liminates leterodynes, reduces Loise and interference imultaneously on SSB, lMt CW, packet, tTTYj SSTV, WeFAX, AX, weak signal VHF, EME, satellite --icarly any mode. You get MFJ's tunable FIR linear phase Iters that minimize ringing, prevent data rrors and have brick wall filter response ritli up to 57 dB attenuation just 75 Hz away. Only MFJ gives you 5 tunable DSP Iters. You can tune each lowpass, ighpass, notch, and bandpass filter icluding optimized SSB and CW...

The Neat m Amplifier

A great pair of shoes for your HT or data radio. Photo A. Tuning ir up to 35 watts, just like the specs promised Bill Richarz WA4VAF 10035 Little Creek Road Charlotte NC 28227 f you are using an HT or other low Lpower radio for packet, you may want to try your hand at building this Ten-Tec 2-Meter Amplifier Kit. Even if you're not using your HT for packet, you can take the ''scratch oul of your Handi-Seratchy so everyone will hear you full quieting, and love you for it. Recently I acquired one...

Tape Wound Antennas

Peter Laakmann WB6IOM The Highlands Seatlle WA 98177 Using hiic P C plumbing components and adhesive coppcr tape, you can build microwave UllF helicals or HF VHF verticals, di-poles and beams efficient, good-looking antennas that lend themselves to endless fun and experiments. Simply wind a desired pattern of adhesive copper tape onto the pipe. The tape, designed for direct soldering, can he cut to any width by suppliers from stock logs of up to 20 inches, making his a printed circuit approach...

Antenna Noise Bridge Detector

Noise Bridge

Tune your antenna, then measure its radiation pattern with this pocket-sized instrument J, Frank Brumbaugh KB4ZGC Box 30 - c o Defend in i Salinas PR 00751 Using an antenna noise bridge is one of the best and simplest means of measuring antenna characteristics. It is invaluable for tuning an antenna, especially a beam, to resonance at a desired frequency. Normal ihe station receiver is used with the noise bridge as a detector to indicate die resonant frequency of the antenna, and the...

The Difference Is Dedication

Alfred A Mrkalow III K700Z 55371 McDonald Road Vernonia OR 97064 The snow had been building up in the mountains. In a week, ai the 1200-foot high Vernonia Peak Observatory, 15 inches had fallen. The higher mountains had received two feet or more. Then the rain started. A iayer of ice half an inch thick covered the snow. On February 4. 1996- weather patterns changed and the Jet Stream moved from the Arctic to the Tropics, . te precipitation changed to warm, heavy rains, and the temperature went...

Build the Bioelectrifier

Bioelectrifier

Heal yourself and take a poke at the medical establishment at the same time Thomas M. Miller WA8YKN 314 South 9th Street Richmond IN 47374 One of the first things a new amateur learns is that electricity and biology are not very compatible. A brush with the AC line can be a painful experience, and accidental contact with the high-voltage supply of a large transmitting tube can be fatal. Because of this early training, occasionally reinforced by an unpleasant accidental jolt, it might surprise...

Grnd

MAX-IS7 ADC to plan into parallel port of a computer, conclusively that all of our cells are in some way in communication with each other no matter where they are. Which raises some interesting questions when it comes to organ transplants and blood transfusions. It also ties in with the work of Antoine B champ lt 1812-1908 , who opposed Pasteur's theory of microbes causing illness. You can read Pasteur Exposed, the False Foundations of Modern Medicine by Ethel Hume for the gory details...

Iotana

Tradesmen and workers who worked in isolation during the summer months. These Northern Junkies came from across Canada to work in the nor ill for isolation pay, for months at a time, before returning to their families in the south for winter During the evening, they lounged about the colorful Amatuk Hotel, watching videos and making small talk. For some, our station was a diversion, and they enjoyed the chance to talk to someone new. On July 1st, Canada Day, during my break from the radio, I...