Radio and Electronics Cookbook

73

A field strength meter

Introduction

Having a reliable field strength meter is always useful. There are two basic types – the tuned variety (also known as an absorption wavemeter) and the broad-band variety. A project centred on the tuned variety can be found in this book (An HF absorption wavemeter), and the way it works is also presented (The absorption wavemeter). This project describes an untuned or broad-band type which is every bit as useful as the tuned type, when it is the level of RF in which you are principally interested.

With the possible exception of the meter, you may have all the parts needed in your junk box. The prototype was distinguished by its meter, found at a rally, and marked ‘Safe’, ‘Dangerous’ and ‘Explosive’ on its ...