Simple Amplified Field Strength Meter Circuit

Posted on May 11, 2012

This circuit uses a FET as a dc amplifier in a bridge circuit. R4 is set for meter null with J1 short circuited. Any surplus 50-mA meter can serve in this circuit. RFC1 is any suitable RF choke for the band in use. A 2.5-mH RF choke will do for broadband operation. R1 is a sensitivity control.

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

The antenna can be any small whip antenna (2 ft or less).

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