The Handy Finder is a phase detector. It consists of two antennas and a small switching circuit. The two antennas are alternately switched on and off at a rate of 1 KHz. When the observed signal is received on one antenna before the other, the two antennas are out of phase with the source signal. The result is the appearance of a 1 KHz tone on the incoming audio. This tone is incidental phase modulation produced by the switching action. When the incoming signal is received by both antennas at the same time, the tone disappears, which indicates that each antenna is an equal distance from the source. Therefore, you are pointing right at the signal source! The unit theoretically works on any frequency, but it's most effective frequency range is from 50 MHz to 500 MHz.
Kit comes with; board, components, antennas, coax and BNC connector.
Needed: 9 volt battery and PVC pipe handle.
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Handy Finder - Direction Finding Phase Detector
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