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Never go to a gunfight armed with a flyswatter. Good advice, but how many of us have participated in a foxhunt or set out to locate a stuck mike switch that has timed out the repeater, armed only with an S-meter and a gas gauge? The purpose of this project is to enable you to show up derssed for the occasion, whether it be a foxhunt, tracking a stuck mike or in a real emergency, locating a lost ham or a downed aircraft. Phase Error - not Doppler In operation, this rig alternately selects between two antennas at an audio rate. If the transmitter is closer to one of the antennas, the signal will reach the antennas at different times. This time difference will result in a phase difference or error between the two signals as they arrive at the receiver. As we introduce this error at an audio rate (about 1000 hz.) the error modulates the existing signal. The amplitude of the audio tone is greatest when one antenna is closer to
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