8. INSTALLATION
8-5
8.5
Accessory Cable
When making connections between the radio, chart plotter, GPS receiver, ensure that
the connections are tight and protected from shorting and the units are grounded.
Whether flush mounting the radio or not, it is recommended that a waterproof 8-posi-
tion screw terminal connector block be fixed to the bulkhead adjacent to the rear of the
radio and the connections to and from the radio are made via this connector block.
Note:
In some areas powerful AM broadcast stations may be heard when in the listen-
back mode. If this occurs, change the speaker wire to 2-conductor shielded audio ca-
ble. See the illustration below for connections.
Wire Color/Description
Connection Examples
WHITE - External Speaker (+)
Connect to external 4-ohm audio speaker
SHIELD - External Speaker (-)
Connect to external 4-ohm audio speaker
RED - PA Speaker (+)
Connect to external 4-ohm PA speaker
SHIELD - PA Speaker (-)
Connect to external 4-ohm PA speaker
GREEN - NMEA GPS Input (-)
Connect to NMEA (-) output of GPS receiver
BLUE - NMEA GPS Input (+)
Connect to NMEA (+) output of GPS receiver
GRAY - NMEA DSC Output (+)
Connect to NMEA (+) input of GPS receiver
BROWN - NMEA DSC Output (-)
Connect to NMEA (-) input of GPS receiver
Red
Shield
PA Speaker
Radio Wires
Plotter
Connection
Gray: NMEA Output (+)
Blue: NMEA Input (+)
Green: NMEA GPS Input (-)
NMEA IN (+)
NMEA OUT (+)
NMEA OUT (-)
White
Shield
External Speaker
MEM
Brown: NMEA DSC Output (-) NMEA IN (-)
Connect to
GPS Receiver/
Chart Plotter
Red
Bare
Shield of cable is not attached
on PA Speaker end.
PA Speaker
Connect the bare wire from the
FM-4721 to one wire and to the
shielded.
Make Red and bare connections as short as possible.
MEM
2-conductor shielded
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