Antenna: Description and Operation

When the Radio is turned on, voltage is applied to the Antenna Relay coil. The coil is grounded at G300. The Antenna Relay contacts close, and battery voltage is supplied to the Antenna Motor through MAXI Fuse 8, the relay contacts and the DK GRN wire. The other Motor terminal is grounded through the UP Switch, the GRY wire, and the relay contacts to ground G300. The Motor drives the Antenna up. At the end of its travel, the UP Switch opens and the Motor stops.

When the Radio is turned off, the circuit through the Antenna Relay coil is opened. The relay contacts open to the position shown in the schematic applying battery voltage to the WHT wire. The DK GRN wire is now grounded Since the DN Switch at the Antenna is not making contact with the WHT wire, the voltage to the Motor has reversed polarity. It runs in the opposite direction and drives the Antenna down. At the end of the Antenna's travel, the DN Switch opens and the Motor stops. Both switches in the Antenna Motor are now in the positions shown in the schematic with the Antenna down.

The Antenna is connected to the Radio by the coax leads.