RF Field Strength Meter Circuit

Posted on Feb 6, 2014

A sensitive and reliable rf field strength meter is an invaluable instrument in amateur radio and in radio controlled model area. A field strength meter is used to align an antenna to get the best possible gain, to determine the transmitting range of radio controllers Designing the rf field strength meter to be sensitive it is a requirement be

RF Field Strength Meter Circuit
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cause there must be as many wavelengths as possible between the meter and the transmitter, the measurement can be done without using a stronger carrier signal and most of the radio controllers are of low power type. Considering these factors, a dual MOSFET is used as an RF amplifier in this circuit. The amplification can be adjusted by P1 and with S1 switch we can select three frequency ranges:

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