Antenna: Description and Operation

CIRCUIT OPERATION
When the Radio is turned "ON," voltage from CKT 43 is applied through the Radio and CKT 143 to the Antenna Relay coil. The relay contacts close and battery voltage is supplied through the DK GRN wire to the Antenna Motor. The Antenna Motor is grounded through the Up Switch, the GRY wire, and the relay contacts. The Motor drives the Antenna up. When the Antenna is at its full height, the Up Switch opens and the Motor stops.

When the Radio or Ignition Switch is turned "OFF," the circuit through the Antenna Relay coil is opened. The Antenna 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 Down Switch at the Antenna is now making contact to 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 Down Switch opens and breaks the current flow. Both sets of switches are now in the positions shown in the schematic, the Radio is "OFF," and the Antenna is down.

The Antenna is connected to the Radio by coaxial cable.