Antenna relay method and apparatus

摘要

An antenna motor drive system for raising and lowering an antenna. Response to a user input for raising or lowering a vehicle antenna is delayed to avoid rapid reversals of the antenna drive motor. This avoids the large surge currents associated with the prior art. The circuit monitors drive circuit response and de-energizes the motor if an inappropriate response is sensed after a certain period. Use of switching transistors rather than a relay facilitates implementation of the invention in integrated circuit form.