Field Strength Meter

Posted on Jul 19, 2012

This Field Strength Meter has been specially designed for our FM bugs. It is capable of detecting very low power transmitters and will assist enormously in peaking many of our FM transmitters that have a coil in the output stage that can be adjusted for optimum output.

Field Strength Meter
Click here to download the full size of the above Circuit.

The circuit consists basically of an RF amplifier, diode rectifier and a DC amplifier. The first feature that may be new to you is the inductor in the antenna circuit. You may think it produces a short-circuit between the antenna and earth but the inducta

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