Swan

Swan WM 1500 PWR SWR Meier 117XC Supp. . Spkr w, Swan 700CX 10-80 Meter XCVH W 117XC Supp. Spkr., vmx. dc Supply Supp. built in Swan 350 10 80 Meter XCVR W 117XC AC Supply . Swan 240 W 117XC Supply Swan 500 L0-80 Meter XCVR W 117 AC Hwr Supp . TEN TEC 505Ar(jonauI W 250 SAmpSupp 10-80MeierXCVK Triton II 10-80 Melei XCVR W CW Filter 200 Wail P.L P, input Solid Siale YO-100 Scope FLUX 400 10 80 Meter XMTK t KDX 400 2 80 Meter RCVR W Mali Speaker - FT 401B 10-80 Meter XCVH if 101 EX 10160 Meter...

Vertical Antennas

* Wide band performance m New ty-Q 3raps e f-SLOpaftirg auTomanc & ar.o s* - re 'r g je.Tica antenna Omrn-iliirecl orAi certo mance Favorable Li C ralto Higfi O True * -esananctofi all oands Lo jng c j-i-ti to- jaitem ace s aggeo seamfe- '-aiummum construclion. 12 doubie-grfp mast bracket FuO circumference compress an at tubing 01n-ls We< ght ModeL iBAVT W6 Automatic band switching nee d-up Hy-Q liap . t-rn I at1- -matte switching. 5 frand capabthr, Favor-at 6 L C fatso Top loading ccjH...

Mv Communications Specialists

CA 92667 m(714)998-3021 Aug 25-26 All Asian DX contest CW Sept 8* DAFG Short Contest VHF Sept 9* DAFG Short Contest SW Sept 15-16 Scandinavian Activity CW Sept 15-17 Washington State QSO Party Sept 22-23 Scandinavian Activity Phone Sept 29*30 Delta QSO Party Sept 30-Oct 1 Fall Classic Radio Exchange Oct 20-21 ARRL CD Party Phone Nov 17 18 ARRL Sweepstakes Phone Nov 25* DAFG Short Contest VHF Robert Baker WB2GFE 15 Windsor Dr. Area NJ 08004 DAFG 10 METER CONTEST...

Options

lull AutOIMltlt, SMI U H i-s 1111 r.j LI r rwet < I mi- I), Hhd I ftdlJnr or K.ittHi Ri'mnh Cut I I Ihr H*- * Kit(ln* ,inilJni 1 ndliriL- um Mom- khlpI- j If r Sptrm AccesMtMr* . . . ul-h ltu- CkvIHh, Cibldfli Irimi 7 In 7't Ankfiiw, tijTdlinr C.ihlps, ctc Automatic Base Station CW Identifier * at Mt*wntt< sU & f4motecvi ifefcU& UcMt 1 Mi 174 UM S 220-34(1 Ml t4S() - nnj f> or H Pijlf trv rfl Fltr VF-J irifji trtr wt> iniifMii hoiiitJnK Slution (Baso or Repeater) per FCC...

Converter

Schematic diagram of the M OS downconverter power supply tuning unit. 77 is 300 mA to 1 Amp at 24 Vac maximum. CR1-4 are 50 piv, 1 Amp, such as 1N4001, C7 is 500uF or more> RFC1 is about 7 uH, such as Ohmite Z50 or Miller RFC-50. (he three chassis-mount coaxial connec-torsf 1-3, are TV-type F61. Si is a subminiature DPDT wired so that the unused cable input is terminated with a 75-Ohm resistor. A power switch seemed unnecessary, but don't forget the fuse.

Info

So a decibel only has meaning with reference to some other power For example, 100 Watts bears the same ratio to 10 Watts as 10 Watts bears to 1 Watt The ratio in each case is 10 to 1 Any two pouer levels having the ratio of 10 to 1 would have the same number of dBs relating them. The basic unit is the beL The be is defined as n log (P1 P2), where P1 and P2 are the two power levels being compared and the base 10 logarithm is used The decibel is 1,10 of a bel, so there are 10 dB per bel, and m 10...

The Woodpecker

I wanted to write you about the tetter in May's 73 Magazine concerning the Russian woodpecker. I tried the recommend ed procedure from the shack at the store, and it worked. It may have been coincidence, but soon after I began to send dits in time with the clicks, the in terference stopped. Even if it was coincidence (both times), it made me feel better I hope it ts really working, tor that damn noise has helped me lose more DX than just about anything. The gentlemen from the West Coast DX...

Offtheshelf Specials

PLATE XFMR 3000 VAC 3.0A CCS Z 30 PRl I 20LB 5450 PLATE XFMR 7.400 VAC I 5A ICAS 220 240 PRl 4 1 LB S I 50 PLATE XFMR 3000 VAC 1 5A CC5230 PR 60LB S t 95 PLATE XFMR 3000 VAC 0.7 A JCAS M 5 230 PRIZ7LB SM 5 PLATE XFMR 3500 VAC 1 OA ICAS t 1 5 230 PR 4 1 LB S L 50 PLATE XFMR 4000 4600 VAC 1 5A ICAS 230 PRl 60LB 195 PLATE. XFMR 6000 VCT OSA CC5 it 5 230 PRI-4 1 LB S I 50 FJLMT XFMR 5 0 VCT 30A M 7 PRI-9 5LB J 30 FILMT XFMR 7 5 VCT lt 2 1 A t 1 7 PR1-9.5LB S 30 FILMT XFMR 7 .5 VCT 55A 1 5, 230...

Oklahoma City Ok

The Private Satellite Seminar,0 sponsored by Bob Cooper, Jr,, Editor-in-Chief of CATJ Magazine and host of the Satellite Magazine television program, will be held on August 14-16, 1979, at an educational institution in Oklahoma City, Oklahoma, Highlights will include a two-part seminar on the TO 2 conversion and a two-part seminar on the Howard Ter minal complete plans included in registration packet . Numerous manufacturers will be on hand to demonstrate their equipment and to investigate the...

Put It Right Where You Want It

With one hand, raise the tower from 211 to as high as 55'. Find exactly he righl receiving level from CB, Ham or TV. When you want to adjust your antenna, install a new one, or pull maintenance, crank it down again. No more climbing up in ihe sky to repair or replace antennas. With the exception of our breakover models, this is the most convenient tower you can buy. BftEAKOVERS THE ULTIMATE IN CONVENIENCE Our breakovers not only telescope, they lie down for you. One man can crank it down, then...

M

INPUT SHIFT-REGISTERS PIN I ON KEYBOARDS WITH SPACE AR Fig. 2. Keyboard letter word space-timing circuits. tire concept on your keyer with a couple of pushbutton switches before you invest in a keyboard. This approach is recommended in your prototype design, Regardless, I see no complication in going keyboard a la carte with popular keyer designs such as the Accukeyer and the more recent micro-to-keyer concepts. The only test equipment used during many hours of experimenting was a multimeter...

Wholesale Retail

Quality American Made 10 5.00 100 35.00 12.0 V. 1.2 AH 10 hr rate 4 1 2 x 1 7 8 x 1 3 4 Si495ea. E F Johnson External Battery Charger Model 239 o o -ooi outpui Edge Meter 250 UA. Fits in 5f8J x 1W hole MTG holes on each end V1 4 behind panel Stack scale 0-5 botlom 1-20 top 1 25 ea 5 5 00 Edge meter same as. above with silver scale and reads SWR MO E, F. Johnson Signal Strength Meter 200 UA x21V Sq. mounts in 1 V hole y behind panel Scale i-30 db top 0-5 bottom

O

HM160 2mtr, 3db trunk lip ant 33.50b HM179 2mtr,, 3db hole mount ant____ 29.00 b HM20 2mtr. 3db for marine use______ 39,00 b HM176440MHz 5db trunk lip ant . 33.00b HM175 440MHz 5db hole mount ant . 29.00b HM224 220MHz 4db trunk lip ant 33.50 b ME Uli I ASP-694 Va JVC WI Magnetic A Low profile magnetic antenna with cable and connector, Tunabfe 106-512 MHz. Can be converted to gain antenna later Wt 3 lbs. AR2 2meter Ringo base ant 24.95 b ARX2 2mtr Ringo Ranger base ant , - 39.95 c AR220 220MHz...

Look At The Signal Enhancer

In the fifties and sixties, the best way to improve receiver selectivity at tow cost was to add one of the outboard devices popular then, such as a Q-multi-plier which worked on the set's t-f stages or a war surplus radio range filter which was inserted in the set s headphone lead Both methods left a lot to be desired. It seems that suddenly hams have discovered that the easi est and in some ways, most cost-effective way of improving receiver selectivity is to add an outboard audio fitter The...

Jacksonville Fl

The Jacksonville Hamfest Association is pleased to announce the 1979 Jacksonville Hamfest and ARRL North Florida Section Convention to be held on August 4-5, 1979, at the Jacksonville Beach Municipal Auditorium, Jacksonville, Flor ida. The location is just one block from the beach, where U.S. 90 meets the sea. Advanced registrations are available at 3.00 per person from R, J. Cutting W2KG1 4, 303 10th St., Atlantic Beach, Florida 32233. Price at the door will be 3.50, A large indoor swap area...

British Hamfest

The RSGB was kind enough to arrange their yearly hamfest during my short visit to England in May, bless their hearts. My main purpose for the trip was to set up distribution of Instant Software in the UK and other European countries, but you can be sure that I didn't miss visiting the yeariy hamfest. It was quite a way from the center of town. Sherry and I found it at the end of an Underground line . plus a bus trip .,. at the Alexandra Palace , a large building. My ego got a boost right away...

Microlo

Mode and Speed Readout 24 Hour Clock Normal and Zoom Display Normal or Inverted Video Computer Trainer Brag Tape'1 Digital or Analog Selection of Morse Speed Automatic T R Switch Expanded 1 ext Buffer to 1950 Characters Automatic CW Identification Complete CW Baudot ASCII Split Screen System from 999 with your T.V. Includes AKB-1 Keyboard and AVR-2 Decodcr. Direct hookup to your transceiver - nothing else to buy. Upgrade your existing MICROLOG system with our Split Screen field mod kit only 99...

Vhf Fm Receiver Kits From Hamtronics

Hamtronics, Inc., has just announced an exciting new series of VHF FM receiver kits. The model R75 is the fourth generation receiver by Hamtronics. and it incorporates all the design features of the previous designs plus some new ones. The chief feature of the R75 series is a wide range of selec iivity options. Four models, with different crystal filters, provide the optimum selectivity foreach type of service, ranging from 30 kHz at 60 dB for weather satellite reception to 15 kHz at -100 dB...

Mfj Kw Versa Tuner Iv

The MFJ-980 is MFJ's lowest priced 3 KW Versa Tuner IV but has the same matching capabilities as the other 3 KW Versa Tuner IV's, Features an efficient, encapsulated 4 1 femte balun for balanced lines. Accurate meter gives SWR, forward and reflected power in 2 ranges 2000 and 200 watts. 4 1 ferrite balun. The MFJ-981 3 KW Versa Tuner IV is one of MFJfs most popular Versa Tuners, An accurate meter gives you SWR, forward and reflected power in 2 ranges 2000 and 200 watts. Encapsulated 4 1 ferrite...

Heard On The Band

The OE6XG A group ran off some 13,800 contacts from Abu Ail despite generator problems. QSL to WA3HUP with SASE. etc. Financial contributions lo help offset the several thousand dollars spent by each member of the group would be appreciated, 3B8CF, 3B8CD, and 3B8DA all hold licenses for 3B6, Agalega, and visit the island regularly to maintain the radar and weather-monitoring equipment. While we're in the area, 5R8AN has been active Mondays and Thursdays from 1900Z VK9NI on Norfolk Island runs a...

Mrf901 Oscillator

Shown in I ig. 2 a is representative of the MDS receive system as described m this construction article. This system consists of a mixer, voltage controlled local oscillator and i-f amplifier located at the antenna, and the com bination power supply tuning unit, located at the TV set. The RG-59 U feed line then performs the dual purpose of carrying the i-f signal down the line to the TV and carrying the power supply tuning voltage up the line to the converter. This results in a nice, cheap, and...

Iarl

Please count me in as a charter member of the new International Amateur Radio Lobby. I'll join as soon as you call for members Whatever happens during WARC 79, we all need to be more prepared the next time around. The organization you outlined in the April, 1979, issue of 73 looks as close to ideal as possible. I hope you can get it alt together by the end of the year. In answer to your questions, ten dollars a year is more than fair. With the ARRL asking eigtv teen dollars a year, you could...

Yaesu Ft Zd

Complete repair iab on premises Tubes and parts in stock Export inquiries expedited Spanish spoken Fig, 3L Hanging method B sloper. This method requires about 60' of yard space, but can be used if a tree or mast near the house cannot be utilized. satisfactory, if you continue to trim the 14 wire to a point where there is no more wire to trim and the swr is still too high, you must start cutting off 6-inch pieces of the antenna itself. Be sure that the braid and center conductor of the antenna...

Ftrb

Yaesu 227rb

The FT-127RA, FT-227RB and FT-627RA, FM transceivers, allow scanning and expanded memory coverage for the demanding VHF FM operator. All feature up down scanning capability with control from the microphone the scanner wil also search for a busy or clear channet. Four memory channels are available two for simplex, three for repeater channels,one for a split of up to 4 MHz. Other performance features are similar to those of the renowned FT-227R. OPTIONAL EQUIPMENT Keyboard Microphone YM-22 for...

Tempo Introduces New Kfz Miniature Tribander Antenna

Henry Radio has announced the full availability of a new miniature K6F2 20 15 10 meter tnbander antenna under ms Tempo brand name, Measuring only 8 feet square, the new antenna is based upon a fulf half wave-long constant-current loop design using capacitive phase shifters in the outer arms to achieve front-to-back ratios on the order of 15 dB. Gain over a full-size dtpoJe is 1 dB, The new Tempo tribander is constructed mainly of exceptionally strong and lightweight fiberglass antenna rods made...

Qkt

F g. 2. a 8 ocfc d agram of MD5 rece ve system as described in this article. b Block diagram using alternate crystal-controlled local oscillator. Frequencies shown are correct to convert down to standard VHF TV channel 3 video . fine inexpensive diode for microwave mixers, but H-P does not give a noise figure rating for it Any good Schottky diode can be in this circuit, but if you want to know its noise figure rating, you will have to pay more. The 2835 is about

Performance In Any Other Speech Processor

ALPHA VOMAX can boosl the ltalk power of your rig up lo len times 10 dB or more under tough conditions. VOMAX SBP 4 s spiff band processing Is the only technique more effective than d clipping. Because harmonic and intermodule tion distortion is uniquely low. Intelligibility is superb and your voice sounds natural. SET IT AND FORGET IT Silky smooth AGC absorbs changes in mike output up to 40 dBT virtually insuring optimum clipping and a clean, crisp signal at at limes. And VOMAX installs easily...

Tentec

EXPORT 5715 LlNtOLfc AVE CHICAGO, ILL. 60646 Choice of readouts OMNI A for analog dial or OMNI D for digital dial Built-in VOX and PTT facilities Selectable Break-in, instant or de ayed receiver muting Dual-Range Receiver Offset Tuning kHz or 0.5 kHz Wide Overload Capabilities, dynamic range typically exceeds 90 dB and a PIN diode switched 18 dB attenuator is also included. Phone Patch Interface Jacks Adjustable ALC Adjustable Sidetone Exceptional Sensitivity 200 Watts input to final with full...

Frequency Counter

As much accuracy as you'll ever need Bill Pasternak WA6JTF Associate Editor easures frequencies to 600 MHz includes oven-compensated crystal timebase includes built-in 600 MHz prescater . . not an ad-on resolution to 1 Hz direct and 10 Hz prescaled sensitivity 10 mV rms 146 and 220 MHz to 50 mV rms 450 MHz accuracy .5 PPM over temperature, automatic decimal point placement 8 large bright .5-inch digits and more ' . Yes, these are nice claims for any piece of equipment, and, when you realize...

Lunafts New Model M Linearized

We held off on announcing it until it was right Ready now Order today from your Lunar dealer. These unique antenna towers can be installed on the ground or roof. Since they're easily transported and site erected, they're a natural for field and portable operations. Constructed of sturdy aluminum alloy, they're sturdy enough to handle large size HF beams and are available for up and down converter systems Can be connected in any combination your system dictates....

How To Disconnect Alc In A Ft 901 Radio

If you would tike smoother ALC action or if you've been concerned about meter readings in the green part of the ALC scale , this simple modification will ease your mind and produce very good results. Remove the 901's bottom cover and locate the socket for board PB1703, Connect a 68k, VS-Watt resistor between the ground and pin 16 of this socket, then bypass the resistor with a 2.2-uF tantalum capacitor. This is a good time to tweak dot-dash ratios on the Curtis Keyer, if desired. The keyer's PC...

Delaware History Gloryland Park Bear

The fourth annual New Delmarva Hamfest will be held on Sunday, August 19, 1979, at Gloryland Park, Bear, Delaware Donations will be S2.00 in advance. and 2.50 at the gate. Tables are available at 3.00 each. Tailgating will be 2.00 per space. There will be many prizes, and food and drinks will be available. Talk-in on .52Z.52 and ,13 73, For tickets or information, send an SASE to Stephen Momot K3HBP, 14 Balsam Rd., Wilmington DE 19804. Make checks payable to Delmarva Hamfest. Inc.