Product Of The Month
The AR-470D from ARtfAmen can Reliance Inc. is a convenient drop-proof hand-held device that has all the features and benefits of a bench-top LCR meter at onty 20 o the price it displays a fast reading of inductance. capacitance or resistance on its 2000-counu 3Va digit, liquid crystal display. It provides seven inductance ranges from 200 pH to 200H, nine capacitance ranges from 200 pF io 20 mF. and eight resistance ranges from 2 ohms to 20 megohms, offering a maximum resolution of 1 mil-liohm,...
Kenwood
Priority alert function. Large, easy-to-read multifunction LCD display With night light. Jr, Audible beeper to confirm keypad operation. BT-5 AAcell manganese alkaline battery case W Bl BC-7 rapid charger BC-8 compact battery charger SMC-30 speaker microphone SMC-32 mini speaker microphone SC-12,13,27 soft cases f m RA-3,5 telescoping antennas RA-8B StubbyDuk antenna TSU-4 CTCSS decode unit VB-2530 2m, 25 W amplifier 1-4 W input MB-4 mobile bracket BH-5 swivel mount PG-2V extra DC cable PG-3E...
Problems
The frequency domain approach can often show problems clearly, which only close examination in the time domain with exotic equipment will reveal. For example, a circuit used for digital scope evaluation appears to produce the square wave of a 4-bit counter. The signal has a fast risetime around 1 ns. and some overshoot like that found in any digital system. This viewed on an analog 100 MHz scope is shown in fig, 7, Looks conventional, doesn't it The same signal is then applied to the Spectrum...
Fax
C,L, Houghton W amp 61GP San Diego Microwave Group 6345 Badger Lake San Diego CA 92119 Last month I covered a temperature control circuit that could be used for a crystal oven control circuit. This month the topic is a crystal oscillator circuit I used In conjunction with the temperature control circuit. The circuits were built to supply a reference frequency for control of a 6 GHz microwave brick oscillator. The bricks normally require an oscillator in the 90 to 108 MHz rangeh with some...
Chester Qsl Cards
Chester QSL Cards now offers you the ability to order GSL cards on-line using their new Bulletin Board System. You can also monitor your order and obtain current information regarding shipping dates, By using the BBS, you can save 5 on your order to help offset the cost of your call. You can also request free samples or order form packets. The only terminal requirement is the ability to display 60 columns and 24 lines, You may access the bulletin board from 6 p.m. to 6 a.m. CST Monday through...
Rotary 1
tance and inductance are low Q Some designs use an additional fixed coil just for 10 meters, sacrificing variability for higher Q. In my commercial tuner t on 10 meters most of the circuit capacitance and inductance come from stray sources in the wiring or the component construction. Just convening its design to the SPC circuit would not achieve much, but the conversion would lengthen the 14-inch long unit by another 10 inches by replacing the single-section capacitor with a split-stator...
CIRCLE ON READER SERVICE CARO Rjk
Andy MacAHister WA5Z B 14714 Knightsway Drive Houston TX 77083 On July 16th of this year, Pakistan joined the ranks of those countries with satellites transmitting within the amateur bands. Launched on a Chinese Long March rocket, BADR 1 was lofted into a low-inclination elliptical orbit. Many stations were surprised when UoSAT-type data was heard unexpectedly on 145.825 MHz FM, Early information from Dr. Martin Sweeting at the University ot Surrey in England indicated that the satellite was...
he ZED LOOP Special
An inexpensive HFbeam with a new twist The 'ZL Special antenna, named after ZL3MH who first designed it, is well-known to enthusiasts who want a simple, easy-to-build, inexpensive, high-perform-ancc wire beam. Basically, ihe ZL Special consists of two folded dipoles fed out of phase to provide a strong radiation lobe in one direction, and signal cancellation off the back. It is a slightly different version of the famous SJK antenna designed and published by John Kraus WSJK in the 1930s. John's...
Superfast Morse Code Supereasy
Subliminal cassette. 10 LEARN MORSE CODE IN 1 HOUR, Amazing new supereasy technique. S1D. Both 17. Moneyback guarantee. Tree catalog SASE. Bain. Dept 73-4. 1 196 Citrus, Palmbay Ft 32905. BNB531 SB-220 221 OWNERS 20 detailed mods wtiEcfi include 160-S meter operation, QSK. I-enhanced p,s. 50 rebate tor new mods submitted 9 pages of 3-50QZ tech info. Si 1 postpaid. Info. SASE, BOB KQ2LAREK WA2SGQ, Memorial Place, Elmwood Park MJ 07407 BNB501 ROSS1 SS S USED October ONLY SPECIALS KENWOOD SM-220...
Of Maryland
8524 DAKOTA DRIVE, GAITH R5BURG, MD 20877 If you've bought a new 2 meter rig in the past couple of years, chances are the radio has more capability than you realize. While you're driving down the interstate ray-chewing with the gang on the repealer. it might pay to check out the action oil the rest of the Vlll spectrum your radio can receive. Almost al l new 2 meter mobile and hand-held radios arc capablc of tuning in the 138-144 and 148-174 H bands above and belowr the 2 meter amateur...
Info Qvj
The t'eedpoint impcdance was such that I had a VSWR of 1.4 1 at the 28,500 MHz dtrsign frequency. This was maintained till the way down to 28.000 MHz, The VSWR increased to 2 1 at 28,8 MHz yielding an effective bandspread of about 800 kHz for this antenna. Perhaps by centering ' it a bit higher, couid have easily covered the entire 10 meter band with an acceptable VSWR. As a matter of fact, I have used it on 12 meters with an antenna tuner and received excellent reports, k does appear to have...
The Yaesu FT
A hot performer loaded with features. Yaesu USA 17210 Edwards Road Cerritos CA 90701 213 404-2700 Price Class 3400 Photo A. The FT-1000 is a lot more complex looking than it is operating. Easy to use ou ve seen the photo ads in all the magazines and now it's here the Yaesu FT-1000 transceiver. It's big, powerful, loaded with features, and expensive. The last point is relative, as everything seems expensive these days. Among the top features of the FT-1000 are dual frequency reception, a full...
Lm317 Current Limit Circuit
Versatile solution for your power supply needs. hen 1 get involved in projects, I never seem to have enough power supplies to go around. When one's available in my shack, it's usually the wrong voltage, or it lacks a feature 1 need for the project. Building this versatile supply solved my power supply problems. This power supply provides a fixed 5-volt output suitable for TTL logic and a variable voltage output ranging from about 1.2 volts to 21 volt, , which is suitable for almost anything...
Spain
Woodson Gannaway N5KVB EA Apartado 11 35450 Santa Maria de Guia Las Paimas de Gran Canaria Islas Canaries Spain Good news for four of the members of Union de Radioaficionados Las Palmas URL in the Canary Islands. They were advised that they had won their class in the Associazione Radioama-ton I tali an i ARI International DX Contest. The four con testers are alt active members of the URL. Elsa EA8BVH has been an amateur since September 1988, and in this short time she has won atmost every...
Brian Beezley Ksti
K6STE has released a new MNC program for iBM-compatible computers MNC uses optimized, hand-coded assembly language in the kernel code of the MINI NEC algorithm, substantially improving performance Unlike com piter-generated code. MNC uses inline coprocessor instructions for maximum speed. In addition, MNC makes full use ot ihe on-chip coprocessor stack to minimize slow off-chip memory accesses Where possible, MNC maximizes parallel execution ol host processor and coprocessor instruction...
Info Nvi
Ivoty RG 11 U lerrnlnatwd with ha amp wy-duty F connedora. Also Includes aF-01 spitoer artd a 75 ohm terminator load, New cables manulEidurtid tof IBM pc lt OTJ-T natworks. UL listed. Specs 75 ohm InpadancQ. Cable Jacket O.D. 0 40V, OM amp cirk 0.2B5H dla. Center conductor 0.047-diamaior, IBM P N t5G190flCOIW SCOPE. CATi RG-11-1 100 fool roll 115.00 CAT RG 11 2 200 foot roll S275Q TERMS' Mtntmurr ontor 10 00 ShpptnQ handling hr the 48 conhnentil Lt S A 3 50 per order Alt afters tnckJdinQ AK Hi....
ooo ooo
Uniden Corporation of America has purchased the consumer products line of Regency Electronics Inc. for 12,000,000. To celebrate this purchase, we're having our largest scanner saie in history Use the coupon in thisadforbig savings. Hurry, offer ends January 31, 1991. it it ir MONEY SAVING COUPON it Gef special savings on the scanners tisted in this coupon, This coupon mtt t be included with your prepaid order Credit cards, personal checks and quantity discounts are excluded from this offer....
Suparco
Sweden 73 troubleshooting 58 UHF RDFing 52 vernier drives 59 VFO shifting frequency 59 W1XU Jim Gray 26.41,85 W4RNL, L.B. Cebik 22 W5KNE1 Bob Winn 50 W60WP, FA Bartlett 46 W6WTU, Hugh Wells 10 WA3AJR, Marc I Leavey, M.D 78 WA4BLC, Bill Clarke 18 WA5ZIB, Andy MacAltister 76 WA6ITF. Bill Pasternak 60 WA6RKD, Gil Pries 17 waveguide 64 W82MGP, Carole Perry 56 WB6IGP, C.L. Houghton 64 WB6NOA, Gordon Wes 38 WB8ELK. Bill Brown 14,34.54 W68VGE, Mike Bryce 59 WB9DYI. Michael Hansen 28 Yaesu USA 18...
Info Hzm
i 716-924-4555 RAMSEY ELECTRONICS. INC. 793 Canning Parkway. V ctor, NY 14564 HF Equipmenl Regular SAL IC-76S XcvT ps 'teyei ulo luner 314900 2699 IC-78i Xtvr Rcvr ps tuner scope 6 49 5199 IC-751A 9 band w I 30 MHz rcvt 169900 1469 PS-35 Internal power supply 219.00 J99 s R-63A 250 Hz CW hlter 1st IF 59 00 FL-52A 500 Hi CV filter 2nd 115 00 109 FL-53A 250 Hi CW lilter 2nd FFJ____IIS 00 L09 FL-70 28 kHz wde SSB filter 59,00 IC-735 HF xcvf SW rcvr mjc 1149.00 989 PS'55 External power supply...
Decoder Cw Con Lm567
Add the feature the manufacturers forgot. Before transceivers became state of the art and the receiver arid transmitter were separate entities, zero beating a CW transmitter to the station called or worked was a simple matter Brielly switch on the VFO, and .ero in on the incoming signal When transceivers appeared on the scene, difficulties arose. In early designs. tuning for an acceptable r eat moved the transmitter frequency so the two stations ended up a heal note apart. Modifications...
L Stock
Figure 4. Simple 2-piece aluminum transmatch case present 154-12 unit is equivalent to the 1950s 50E45, while the 154-508 splh-stator model is Lhe old 50ED45. Bath units have 52 to 53 pF as their maximum values and 10 ro 11 pF as minimum values. Capacitance meter measurements confirmed the figures. New units cost above 35 and 60, respectively, but you may be able to find good quality units of either model at hamfests. What gives these units their low minimum values is the use Of trapezoid end...