Silicon Mmic

Up to 31 dB of gain is possible at 70 cm with the new IN A-02184 MMIC from Avantek. Noise figure at that frequency is 2 dB. The 3-dB bandwidth for the device is dc to 800 MHz, making it ideal for many VHF and UHF amateur applications. Even at 1.5 GHz, the gain figure is still 26 dB. The amplifier is available in either a pill size mount, or in a surface mount package. The devices are inexpensive, costing less than 5. Data can be obtained from Avantek, 481 Cottonwood Drive, Milpitas, CA 95035,...

Shift Registers

This month I'll continue the digital electronics primer. I've received many positive responses to this feature, and I'm glad that so many of you are enjoying it. The topic this time is shift registers. Shift registers are the first digital component that we've looked at that is synchronous that is, an externa clocking signal ensures that the inputs and outputs are all synchronized together. In general, shift registers are used to convert serial data to parallel and vice versa. For example, data...

Index March February QEX Volumes

BNC to Banana Plug Adapters 15, Mar 90 Designing Circuits with LEDs 15, Jul 90 Digital Video DVI Technology 12, Sep 90 Harris single-Chip Power Supply 17, Nov 90 Integrated Mixer Covers 500 kHz to 500 MHz 13, Sep 90 Micro Linear Programmable Sinewave Generator 16, Jul 90 Microprocessor-Compatible DTMF Transceiver 18, Nov 90 National Semiconductor LM1211 15, Mar 90 SPDT Wide Frequency Antenna Switch 15, Mar 90 Speaking of Connectors . 15, Mar 90 1230- to 1250-MHz Coupler 13, Sep 90 Graphics by...

Quick Yagi

2 to 12 elements from 1.5 to 500 MHZ Calculates forward gain, f b ratio, real amp imaginary impedances amp beam width Elevation amp azimuth polar plots in a log or linear scale. CGA amp EGA Metric foot-inch conversions, tapered element compensations amp auto design functions Saves amp retrieves antenna files Requires IBM PC XI AT or compatible with CCA, EGA or VGA. Available on 5 1 4 or 3 1 2 diskettes.' Only 30.00 post paid in U.S. amp Canada. Olhers add 2 .00 for postage. Arizona residents...

Qex

Switching Power Supplies for High Voltage By Timothy P. Hulick, PhD, W9QQ 886 Brandon Lane Schwenksville, PA 19473-2102 Have you ever wanted a full legal-limit power supply that only weighs eight pounds, one that is easily built with a 12-V dc input High-power HF linear amplifiers have not changed much over the past quarter century or so. They are still very heavy and mostly use tubes. Even though solid state is around, tubes are by far the more popular choice. Sure, some are microprocessor...

The Great ARRL Antenna Book

Twice the size of the previous edition Over 700 pages 987 figures The 15th Edition of The ARRL Antenna Book has been dramatically expanded in a similar fashion to recent editions of the ARRL Handbook and the ARRL Operating Manual. We've drawn on material produced by the ARRL Technical Department and from 16 well-known outside authors who have done much to contribute to the state-of-the-art in antenna and transmission line design. Available in softcover only for 18 at your dealer or directly...