Simple Amplified Field Strength Meter Circuit

  
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 - schematic

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




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