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Table Of Contents

A PSK DEMODULATOR FOR THE JAS-1 SATELLITE- 3 The first Japanese Amateur Radio satellite will be launched in August. This demodulator enables you to receive its telemetry. Here's how an Amateur Radio operating post will allow thousands ot amateurs to listen to and work the Phase III and Phase IV satellites. A HIGH-RESOLUTION POTENTIOMETER - 13 This circuit allows for fine adjustments over a considerable range of voltages and can be used as a substitute for a multiturn potentiometer. An interface...

High Resolution Potentiometer

Welter, WD8KBW 1325 Cambridge Blvd, Columbus, OH 43212 Occasionally, amateur projects require fine adjustments of voltage over a considerable range of voltages. For adjustment over small voltage ranges, a conventional potentiometer padded with series resistors can be used. For large voltage ranges, use a multiturn potentiometer. An alternative to the multiturn potentiometer can be constructed from a dual-and single-gang potentiometer. Resolutions even greater than with a precision...

Focus on technology above MHz

MMICs Gain Blocks for Modern Equipment By Bill Olson, W3HQT Box 1655A, RFD 1 Burnham, ME 04922 Fig 1 The photograph at A shows a 0.010-inch-square MMIC chip. The input bond is at the top left. The double bond near the bottom is ground. The output collector is the back of the chip, which is also connected to the metallization around the top of the chip. The schematic diagram at B shows the circuit for an Avantek MMIC. RF is a negative feedback resistor and Rc is an on-chip decoupling resistor...

Community Access Stations

By James Eagleson, WB6JNN 15 Valdez Lane Watsonville CA 95076 This article was written prior to the report of OSCAR 10's ill health. The satellite is referenced only as an example of the potential that such a communications system as this possesses. Ed. Many potential users of the OSCAR Phase III and Phase IV satellites are unable to communicate through the spacecraft for various reasons. These reasons include budget restrictions, or a lack of technical knowledge or equipment. It should be...

A PSK Demodulator for the JAS Satellite

Psk Block Diagram

By Fujio Yamashita, JS1UKR, JARL, Sugamo 1-14-2 The digital transponder on the JAS-1 satellite is designed to transmit its downlink signal by PSK modulation. Therefore, reception of the downlink signal requires a PSK demodulator. Several circuits are available, but this article introduces another recently developed. A PSK signal can be thought of as carrier-suppressed double sideband DSB . To demodulate the signal, a carrier signal identical in frequency and phase as the received PSK signal is...