Have it

The R8 is like a breath of fresh air, with its ground-up engineering and up-to-date digital control from the front panel I am very pleased to see a quality HF receiver of American manufacture that should successfully compete on the world market, When we introduced the American-made R8 Worldband Communications Receiver, we knew it would be Judged by some very discerning ears, experts accustomed to the finest in short-wave listening equipment from around the world, After listening to the world on...

Circle Oh Reader Service Card

Refer to the above article in the December 1992 issue, page 12. Diode D1 is backwards in the schematic diagram Figure 3), it should be Installed as shown in Figure 1 below. Note that the diode position is shown correctly in the parts placement diagram in Figure 4b. TNX to Joe Leikhim for the correction. The Baste program to determine the diode placement for a given frequency has a typo in line 9000 (010 r was entered twice instead of l,0110). It should read S000 DATA OQOQYQQOI YOG...

Communications

IndpLfii, EN 46256 Vi flnrt N j j i.'frTL irri C igh y highu rWC 317) & 10 BV94 Trar& eJ Shm U e Window Mounl Kil Transei Modi'ied Gam Quafiei wave Antenna Trar& eJ Shm U e Window Mounl Kil Transei Modi'ied Gam Quafiei wave Antenna Write for a Fuir Line Antenna Caiatog al No Cost -DEALERS WELCOME-Mad in The USA . Because It Matters A DIVISION OF U ELECTRONIC INDUSTRIES 123 East South Street Harveyiburu, Ohio 45032 tion helps you plan your day. soft-guard your family...

Continuous Coverage

The CLP 5130-1 covers 50. 146, 222, 440, 902, 1296MHz Ham bands, VHFt UHFt 800MHz Public Service bands, Military, Aircraft bands, even complete Television and FM broadcast band coverage * Outstanding performance with high forward gain, VSWR below 2.0 1 over enure frequency range * Compact and lightweight, all aluminum design, multi purpose horizontal or vertical mounting, * Extra strong, commercial grade construction withstands the worst weather for unsurpassed reliability. * Can pass as a...

Software

06557 1993 Passport to World Sand Radio tty hiterumarmi ftrooiktorinji Senittj. LiA Vou'H get Iht ijtesl station and ifaAe end*, SltJO 03S11 Shortwave Receivers Past and Present tiHtcd try Fred J. Otlcrman Guide to ZOO+-shentwaw receivers numui ctur d in the Usi 20 yean. The filue Hook of Mtonwave radio value. SS.95 07R25 Ttie flTTY Listener by Fred Owrmm Nt* and e pinded- Hiii ipenalized book compile ifWi 1 through 25 of Ihe RTTY LiiUmr eu littler. Contam upHo-daie. hard-to-fuul infctr-nuiitm...

Feb

HAMPTON ROADS, VA Sign up for Hampton Roads Radio Assn s W5YI Exams. Please contact Bill Runyon N4BDH, (802) 487-8611, for details. KHOXVILLE, TN WCARS VEC Exams, for up-grades only, win be held in Room B-129 at PeHissippi State Tech. Comm. College, Pellissippi Campus, at 10 AMh 10 20 AM, and 10 40 AM. Wntten elements at 11 AM. Please pre-register. Contact Ray Adams N4BAQ, (615) 688-7771. or Rich Stover ND4F, (615) 539 821 PARIS TN Henry County H S will De me location for WCARS VEC Exams at 9...

Info

12 > 1 turns trifilar on FT-37-43 Figure 4. An RF amplifier using a single transistor and a power MOSFET 60 73 Amateur Radio Today * February. 1993 Only now are we seeing designs using power MOSFETs in RF applications. Figure 4 is a simple RF amplifier using a single transistor and a power MOSFET. i did not design the circuit credit for it goes to Bruce Franklin KG7CR. The circuit originally came from the NorthWest QRP club newsletter, June 1992. Bruce kindly gave me permission to present it...

Midwest Wood Products

Display your license and cailsign on a 12 or 24 hour solid oak clock. Letters can be changed. Both size licenses accepted. A great gift for that special ham, or for yourself Midwest Wood Products 16141 24th Ave Coopersville IVII 49404 Factory Authorrzed Dealer Service For

Tic General

TtC General has introduced the Model 1022 TtC Ring, downsizing the larger Model 1023 into a compact yet very powerful rotor. Far more lhan a rotor, this is a Ringrotor. with rugged steel ring construction, a powerful drive motor, sotid worm gear braking and galvanized coating. It will mount, hold ana turn large antennas it offers an analog controller, preset. North cen ter South stop, analog meter readoui. memory backup, and an easy-'o-read scale. The TIC Ring Model 1032 is 649 plus S & H....

Oscilloscope

b H STAGE tiAdWVOCTAVEH* T ET RESULTS IC 1 A STftGE (AfldB OCTAVE 1 LP TEST RESULTS Figure 2 (a). Prototype 4 -stage and 8-stage Butterworth low-pass filters (h). Frequency response for the 4-stage filter* to. Frequency response for the S-stage filter. run from VR1 to avoid frequency changes pulling your finger near that wire is enough to shift the dock frequency. The frequency markings on the cutoff frequency control as crowded in the upper range are shown in Photo A, This problem could be...

Bnb

FINALLY HEAR THOSE UNREADABLE SIGNALS buried in noise, het-rodynes, tuner-uppers. The REVOLUTIONARY JPS Audio Filter NIR-10. Digital Signal Processing, DEEP DISCOUNTED 329.95 DELIVERED continental U.S. (elsewhere 350), Also, NF-60 DSP Notch Filter ELIMINATES MULTIPLE NOISE TONES, discounted at 139,50 delivered , see 3 92 73 Magr REVOLUTIONARY WIRE, FLEX-WEAVE Tm 168 strand 414 hybrid wire rope, 36.95 for 275T mln DELIVERED contUS. Coax, etc., Catalog 1.00. Authorized dealer DAVIS RF Co.t POB...

Utmost Modification Bible

THE GREATEST IN JThS TIME EVEN MORE COMPLETE over w complete synthesized cfirsl wlchar 5. ov ift 70 af f'ft gl l i dmqchficatkjn charts. OvEfl 60 fsLL DIAGRAMS - SCANNE M iJtf HO 1K3W oveft 1uq modffilarions fdh pt l. c.h.'s OVER 100 hVUd HACHO MODIFICATIONS. Ten meter modifjcat ons.-liner schematic design. gtfer 000 mike wmin cuo e. anternnwcoax tb gaip qw dcskjn charts CON ROE, TX 77302_check OR MOIEY ORCE

Republic Of Korea

There is a new club in FusanT The Pusan Packet Users Club has had two meenngs so far+ The second meeting was al the Pusan Yacht Harbor (branch office ol the KARL) on September 26. 1992. The club packet repeater station is set up on the mountain of Hwang Ry-ong San and the frequency is 144.74 FM, 24 hours a day. We are also planning to build a repeater on 435 MHz as a duplex system soon. ML5BMM donated a transceiver to the club for this purpose. My station now consists of...

Visa

Old Dixie Highway Vero Beach FL 32967 Telephone (407) 778-5728 Price Class 390 guy rope, S39, Operate 160 through 20 meters with this high performance antenna For the last two years I've been DXing with 100 watts and two verticals, the Cushcraft R5 and the GAP Challenger DX-VI. The GAP DX-VI is a fine antenna, but its performance on 80 meters is limited by its size and narrow bandwidth. I wanted something better for 80, and also some way to get on 160 meters, Dipotes seemed like a...

Tfm

Typical case stytes Style B. the targer unrt is popular with the SBL and SRA mixer types. Style TC* is typical for TFM types, small pin configuration housing placed in a container tnat connects the pins to coaxial connectors. Most of the repack mixers use some of the previously described mixer products as their main component. Some of these mixers with coaxial connectors are denoted with Ihe prefix of ZLW, ZAD, ZEM, and ZFM identifiers. They are constructed with easy-to-use coaxial...

Helical Resonator Preamps

GaAs FET preamps with 3 or 4 section helical resonators reduce intermod & cr oss-band interference in critical applications. MODEL HRG-( * 00 vhf, 110 uhf. Specify tuning rango J42-150, 150-162, 162-174, 213*233, 420-470. TD-2 TOUCH-TOME DuCODER CQN-THOLLER. Full 16 digits, with toll-call restrictor, programmable. Can turn 5 functions on off. Great for selective calling, too1 kit 39. wired & tested 149 TD-4 SELECTIVE CALLING Moi te Economy touch-tone decoder with 1 latching output....

Quality Performance Value Factory Assembled

The SA500 Spectrum Analyzer Scope Adaptor works with any Oscilloscope J list one conned ion to the Vertical and Trigger inputs and your scope becomes a full function Spectrum Analyzer Use the SA500 as a Pan Adaptor Tune up an HT Radio,Tune Filters, Duptexers, Cavities, Mixers and Receivers, Check RF Cables, RF Amps, RF Connectors, Antenna Systems .Evaluate all RF based Systems.,,All this in one simple to use low cost instrument the SA500 Scope adaptor will compliment any Ham Shack, Radio...

Transvertens Receiver Parameter

to all our contributors You can reach us by phone at 603 924-0058, or by mail at 73 Magazine, Route 2Q2 North, Peterborough NH 03458. Or get in touch with us on CompuServe ppn 70310,775 MCI Mail WGEPUB or the 73 BBS at 603 924-9343 300-2400 bps , 8 data bits, no parity, one stop bit. News items that don't make it into 73 are often put in our other monthly publication. Radio Fun. You can also send news items by FAX at 603 9249327. parameter screens, binary and ASCII file transfers, macros, QSO...

Year Limited Warranty

These great new Azden handhelds all feature Rugged commercial construction 5 W atts output-standard Sensitivity lt 0.16 uV for 12 dB SINAD Heavy duty metal heat sink anchors belt clip, antenna, connectors and controls Rubberized keys and controls for non-slip performance Backlit keypad and display with time delay Complete with 12v, 5 watt battery, charger, charger stand, belt clip and hand strap DTMF paging amp Code Squelch Accessories 7 DTMF telephone memory Soft carrying case, LC-16 Receives...

M

Local oscillator circuits for the NE-602. Simply connect one of our fully automatic phone patches to your base station radio. Suddenly your mobile and HT radios can initiate and receive telephone calls without any assistance. MODEL CS-700 An economical simplex sampling patch. The operator is in full control at all times. User selectable operating modes VOX Enhanced Sampling or VOX Controlled Sampling, Features include a 9 Phone number Speed-dialer, Automatic Sample Window Set-up and...

Qrp Hf Ht

Who says you can't take t with yon Imagine ihe thrill of working DX with one of rhese iiny sintde band Ells Outpu12 watts SSB or CYV Sensitive supcrhei receiver with noise blanker. RTT AGO, and S-meter. 2 VXQ ranges on each band 25KHz on 80 40, 50 KHz on 20-6m i. Built in speaker and microphone. Carrier and sideband suppression gt 40dB lt Total weight 20 I. batteries Rugged metal case. Oplimml AccesaufiCG Tdetpopic whip CW tdnonc Addiiioaul crvsials you compensate for any inaccuracy. The...

Build the Tone Processor

Eliminate interfering signals with this versatile The tone processor described here uses the National Semiconductor MF4, a four-stage Butterworih low-pass lifter, As Figure I shows, unlike conventional audio filters, the capacitor filter cutoff fc can he changed by varying Lhe clock frequency f .lk, There are two varieties of N1F4 switched capacitor filters, the MF4- 00 and the MF4-50. The MF4-100 is shown in Figure 1. For the MF4-50. the relationship between lhe cutoff frequency and the clock...

The Foot Indoor Antenna

Foot Indoor Antenna

Make an effective 20 and 80 meter apartment-dweller antenna. Figure L A 23-foot indoor antenna for 20 meters la 20 meter amentia lb 20 meter helical Relocating into an apartment for the first lime can have a very traumatic effect. This, of course, also applies to any other habitation where an HF outdoor antenna is not permitted or is physically impossible to erect, This first happened to me licensed for too many years to remember how many when, over 30 years ago, new employment meani moving the...

Kts

At least three or four times a week, somebody asks me about writing for 73. Since we are always on the lookout for good articles, to 73 and for our sis'er publication Radio Fun, I thought J'd use this space this month to give you all same pointers on gelting published. J hope many of you will give W a try. This is the easy part. Any book on tree-lance writing will tell you thai the best way to know what Kind ot arteles a particular publication is looking for Is to read that publication, Not...

One Full Year Warranty

LCD CENTER FREQUENCY OPTIONAL SEE Opt BELOW 'TWO-WAY RADIO SERVICE MJ RFI TESTING CHECK SECURITY TRANS, AND RfCIEVERS TUNE CAVATfES, FILTERS, DUPLEXERS TV-RADIO BROADCAST MA1NTANCE EVALUATE ALL RF BASED SYSTEMS CATV, MATV, SATELLITE SERVICE 'CHECK RF CABLES, RF AMPS amp RF SYSTEMS MARINE, AIRCRACT, HAM RADIO SERVICE THE ULTIMATE LOW COST SPECTRUM ANALYZER TOTAL FLEXABTLTTY Filter. You aec al TC we know our equipment will bo uaed 10 Thais a bold siattment but the FTC SA Serie We do not preset...

Sagant Antenna

Amow Line antennas from SAGANT U S A. for HFr VHR and UHF are compact and lightweight, wilh a low radiation pattern tor outstanding performance, Model AL-2G7F Is a bas type 2m 70cm dual-bander 51 long. 0.77 lbs mat handles 250W FM. The AL-144F is a compact base antenna for 2 meters. Other Arrow Line models for mobile, 2 meters, HF and 1.2 GHz are available, SAGANT also otters a wide range of wire antennas, such as Zepp-type and inverted V, and HF mobile antennas that are slim and short for...

Alinco Does It Again

In keeping with our philosophy of providing the most innovative products, Alinco introduces the SR4 - D repeater controller. The SR4 - D is a self - contained, remote programmable controller, capable of controlling one, two, or three radio transceivers. t can work as a simplex repeater with digital voice storage up to 2.8 minutes . It can work as a duplex repeater . It can be used with any tvpe of radio, Any band, anv frequency, any mode It has an automatic voice IDer and Time out timer- It can...