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Radio and Electronics Cookbook
book

Radio and Electronics Cookbook

by RSGB
November 2000
Intermediate to advanced
336 pages
7h 43m
English
Newnes
Content preview from Radio and Electronics Cookbook
74

Preselector for a short-wave receiver

Introduction

A preselector is a simple RF tuned amplifier which is inserted between the aerial and the receiver. It provides some extra gain and may improve the overall performance of the receiver. This project uses a Field-Effect Transistor (FET) amplifier in grounded-gate mode.

The design has a tuned circuit at both the input and output which, with excessive gain and poor construction, would produce only one thing – oscillation! So, to avoid this happening, we will have only a low gain, and use a circuit which provides good isolation between input and output. The grounded-gate FET amplifier fulfils both these criteria. It will also cover a frequency range from about 7 to 30 MHz, which includes most ...

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Publisher Resources

ISBN: 9780750652148