Tm

Plug a dip meter coupling coil into your MFJ SWR Analyzer and turn it into a sensitive and accurate band switched dip meter With a dip meter you'll save time and take the guesswork out of winding coils, measuring inductance and capacitance, measuring velocity factor and electrical lengths of coax. Determine resonant frequency of tuned circuits and measure Q of coils. Set of two coils cover 1.8-170 MHz depending on your MFJ SWR Analyzer. MFJ-219 Read SWR of any ant- QQ95 enna 420 to 450 MHz -...

Sig Gen

Test-range setup using a testing path constructed in Kerry N6LZ W s b ac kya d , u 7 1 a re m o te flea po wer Iran s ee i ve r a s sh o ft> h in Fig, 2, The unit is placed at the far end of the backyard-about 200 feet away. The coax at IF frequency of the remote unir 144MHz.) is returned to near end of antenna test range for system evaluation. This provides a relative evaluation of system sensitivity and transmitter output power, including evaluation of antenna performance. it...

Sep

The Manitoba Amateur Radio Museum wilt host Its 3rd Annual Ham Fest on the grounds of the Manitoba Agricultural Museum in Austin, For details write to Manitoba Amateur Radio Museum Inc 25 Queens Crescent, Brandon, Manitoba. Canada R7B 1G1. LOUISVILLE. KY The Greater Louisville Hamfest ARRL KY State Convention will be held at the Kentucky Fair & Exposition Center a indoors. Tickets 6 for both days, Sunday 5 at the door. Send advanced ticket registration with an SASE, Mail requests for tickets...

Authorized Dealer

ALIHCODJ-lffi, OJ-G5TV, hHti Hy-Gairt item. XmmooQ RF UA pb Mirage TE Syttefltft HF VHFAJHF, AMEfTlTFlON, elt WTtKhAS A-S.AES.CuVy h. Hy-Ga , HLK er. KLU MFTZ Urtian ViOOUBtOX TOWi Bjilier-Hjt. A_r- -fend Aip-u ANLJ Ant nn.m SfMMiiSt. Btrtw g. WIligmMn, Co-jne . aiamanii. QAP, Luro3ent Etc. Watt-Mutara Siacited. Ove'HA Te epH nH Syuants I Riji .ArBat Fm fi AM Broadcast Tranir-nitterfl Slacked ASTRON POWER SUPPLES Beiden m e & Cable, hi'I Wire InEXTEl Radios-S burcu-gh coyi> r9ige in NV....

Bilal Company

137 MANCHESTER DRIVE FLORISSANT, COLORADO B08I6 of 50 available memory channels will store your favorite frequencies for quick access. In the AM mode, the easy-to-read liquid crystal display resolves the received frequency down to lkHz. Although tenths of a kHz (100Hz) is not displayed, in SSB it takes ten clicks of the fine-tuning button to move up or down frequency a single kHz. By keeping track of the number of times you have pressed the fine-tuning button, you can resolve the received...

Prepst Selector

I-j _ -.-.- v -. highly selective bandpass filter for 2-29,999 Mhz range lunctionsas preselector forerhancing receiver signal reception or as post selector for reducing exciter output noise when used with 6 db pad (not supplied). Has five decade frequency control knobs and Hi-Lo Gain switch N connection. 5.3x19x20,36 lbs, USED-EXCELLENT 3 350 MANUAL, partial reproduction 20 RF-55QA HF RECEIVER, 0,1-29,9999 Mhz AM-CW-LSB-USB-2ISB on digital read out bandwidth 0.5-6-16 Khz. 45...

Circle On Reader Seh Vice Card

T-iy FMS2 ihirtto quality iransmitler f f - ' ' . ' ta FULLY crystal controlled and . ' . programmdbfe to any FM bcfj ri afil . Unit features ALC,2 1 ccmprosscr audits tjufle- arnpiifter, pre-eniphasis, roll off filter, stereo generator, digital PLL tuning, 75 te -ia Mr . wi cJr 500 mW power o-lp-M and a special 'nlrodLJCiory pr ce of only 295. aa us. _ SchematiCS I-C* ,r 27 C* M.OC 416-243-3225 L v aS Fa. L -vfo 416-243-1067 Tek > NF 41 -243-22 Q L fflQl

Ux X

The trough antenna and some of the gen-era parameters for its design (Ref I,p. 18-11). of operation is quite simple For a radiator at the focus of the reflector, the reflected radiation from the radiator Lravels the same distance to the front of I he antenna regardless of which location it reflects from in the antenna reflector. This means that all of the radiation reflected from the parabolic reflector is til phase at the surface of the reflector, and becomes additive to produce the gain...

Meter

Fig. , Schematic of the interface circuit that combines fluxgate compass and S-meter signals to drive a north-up CRT display Resistors are in ohms and capacitances are in microfarads unless otherwise noted. outputs of the multiplier ICs to single-ended. My receiver's 5-meter tapoff circuit is described in Chapter 5 of the book TRANSMITTER HUNTING-Radio Direction Finding Simplified (available from 7ys Radio Bookshop), It includes ail operational amplifier to drive an jnalog p.mel meter atop ihe...

Circle S On Reader Service Card

Box 473 Stevenson MD 21153 ajr aiinet Well. thi> month find ha e been soundly bhistcd h> Ehe readership. Why Because there are apparently several programs out there that use a Soundblaster card, or compatible, to decode radioteletype, This month, we will have a look Lit two of them, along with one otjter, nonSoundblaster, program for good measure. Brent Stuart ZL4TX dropped me a note tipping me off about an application c alled FTV. written by Brian L....

Info

Design of the corner reflector and the parameters used in Table Ref Lp. J8-I0 t Ihe back of the sheet ref lector. A set of wire elements spaced about one-half wavelength apart arc placed at the front of the box reflector, and help to reflect back the radiation at high angles. This design is shown in Fig. 6 with dimensions for 440MHz and 1250MHz antennas. Gain of approximately I2dB is easily attained and higher gains can be achieved with larger-sized boxes. The advantage of the reflex...

Reviews

24 The Agrelo Engineering DFjr Doppler Direction Finder K0OV A micro-sized shortwave communications receiver with full-sized features, On the cover Thanks to Ray Blowers N20DA of Perm Yan NY for this shot of his repeater site at Bluff Point, in the heart of the Finger Lakes. The ten-foot dish is for NASA rebroadcast Ray carries the missions from 6 00 a.m. to 11 00 p.m, for as long as they're up. The eight-foot solid dish Ku is for Saturday night's This Week in Amateur Radio. Next month your...

Fdim

Ii was standing room onl gt for this year's Five Days In May QRP sessions. Starting Thursday morning, the sessions covered just about c er gt aspccd of operating QRP. No mailer what ou ma be interested in, from antenna design to designing your own Web page, it was covered during the FDIM sessions. Plans arc alread in the works for next year's event. If you have never made ii o the Dayton HamVemion, you must clear the calendar for next year s FDIM. Of course even if you could not make the FDIM...

Negative Resistance RF Preselector

An easy way to soup up that old superhet. Parker R. Cope W2GOM 7 8040 E Tranquil Bfvd. Prescott Valley AZ 86314 Interference, from whatever source, is the bane of the radio receiver user Some interference is on the same frequency as Ihe desired signal, and there's nol much thai can be done about that, Bui there's hope for eliminating or at least reducing off-frequency interference w ith RF selectivity. Off-frequency interference falls into two general categories strong signals that drive the...

Neuer Shy

Mc1495 Wattmeter

And, indeed, 1 found that the system worked as 1 expected. Donors usually get through to the man, non-donors don't. And that's bribery. So we're reading about the High Crimes of the Clinton White House and both of the political parties, plus the time that congressmen have to spend building their re-election campaign funds. When the money is a bit short a senator can threaten an industry with a hearing. Since almost every industry is crooked, that loosens the...

Catalog

Agrelo Dfjr

Outside the U.S.A. send S3.0G postage protect your vehicle's finish. Unless you have nonmetallic or deeply corrugated rooftop, installation will be a snap. 11 'our snaps, actually. Tie Version 4 antenna set has a 12-foot data RJ-250 and RH RG-58 cable, enough for sedans and trucks. I prefer to mount the antenna set at the rear t fm mini van's roof the cables are about three feet too short tor that. Extension cables are available from Agrelo Electronics, or you can make y our own. While any...

Direction Finder

Radio Finder For Amateur

Box 2508 F llerton CA 92837 Homingin ao .corn Dopplcr radio direction finding RDF installations are easily identified by their array of tliree to eight vcr-tical whip antennas. A switching circuit connects the whips to your receiver one at a lime in rapid sequence lo simulate a single whip moving in a circular pattern. Due to a property of physics called the Dopplcr Effect, this apparent antenna motion applies periodic frequency modulation it incoming signals. The...

Coax Connector

The connector block is very weather- e istantt hut not totally airtight. The coax cable connector is attached to the bottom of the block. disconnecting the coax at the tar end, and repeating the measurements. proved conclusively that the coax iiself was perfectly all right . the problem had to be in the antenna. Bui what could go wrong with a nicely-machined, well-sealed antenna's main connection block There was virtually no open gap for water to enter the...

The Killer Beam

Just how much is some assembly 1 recently came into a small windfall of money. This was the opportunity to finally upgrade my radio station. Using the Internet 1 was ubie to locate an old Heathkii 5B2DO for a reasonable amount- It arrived, and even though I still have not been able to figure out how to hook up the transceiver to the linear so that they work together, 1 am able to use it with a manual which turns it from standby to operate. It's clumsy, hut it works, and for the lime being it...

Keys to Days Gone By

Enthusiasm for the code keeps this hams nostalgic collection working. Charles M_ SeayT Sr. 106 South Main Street Dickson TN 37055 People have their own reasons for becoming hams, li may have been the excitement of witnessing a I X contact, the prospect of owning ant appearing on your own television station, the desire to rag-chew, or a love of code and the satisfaction that only a code contact can bring. After a wThtle. the hesi part of the amateur world is the nostalgia that goes w ith the...