4912CONNECTION AND INSTALLATION12 Basic connectionsCAUTION:• After connecting the external speaker, antenna andtuner control cables, cover the connectors with arubber vulcanizing tape, etc., as shown below, toprevent water seeping into the connector.• DO NOT pull the antenna and control cable recep-tacles. This may cause cable disconnection (in thetuner unit), inside connector damaged or a badconnection.NOTE:Turn [DC ISOLATE] (on the IC-M801E main unit) OFF,or charge the battery during anchor, otherwise thebattery may be exhausted.The IC-M801E has a high-stability oven-heater typecrystal oscillator, and the oscillator’s heater is con-nected to the DC power terminals directly, it keepsits temperature to at the specified level even if thetransceiver power with the remote controller hasturned OFF.Rubber vulcanizing tapeHF antenna(for DSC reception)Grounding(see pgs. 51)Grounding(see p. 51)12 V or 24 Vbattery[DC ISOLATE]ExternalspeakerRemotecontrollerTransceiver’smain unitAT-141