ELECTRONIC ANIMAL CONTROL SYSTEM TRANSMITTER WITH VARIABLE PHASE CONTROL

摘要

A transmitter (12) for an electronic animal control system of the type employing a boundary wire antenna (18) for radiating a predetermined radio frequency signal is provided with phase detection circuitry for detecting a phase difference between the applied radio frequency signal and the electrical current within the antenna. Phase control circuitry is provided for adjusting the phase of the voltage with respect to the current in response to detecting a phase difference.