Abstract: An antenna control system employing a d.c. motor for extending and retracting a telescoping antenna for use on a vehicle. The control system comprises a polarity responsive timer, a polarity reversal switch, and a switching device. In one position of the switching device, a d.c. voltage of a polarity determined by the position of the polarity reversal switch is connected across the motor for an interval of time determined by the timer to extend or retract the antenna. In the other position of the switch, the vehicle operator controls the motor and therefore the antenna position.
Type:
Grant
Filed:
July 13, 1979
Date of Patent:
December 1, 1981
Assignee:
Robert Bosch GmbH Geschaftsbereich Elektronik