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Chapter 2: Installation 7
2.4 External Speaker Connections
Located just below the power cord is a cable for connection to an optional
external speaker. Connect the white(+) wire and black (–) wire to the speaker
observing polarity as it is marked on the speaker. When connected, the
external speaker will function simultaneously with the internal speaker.
2.5 Grounding
While special grounding is not generally required for VHF radiotelephone
installations, it is good marine practice to properly ground all electronic
equipment to the boat’s earth ground system. The Ray54 can be connected to
ground by installing the supplied screw and lock washer in the threaded hole
labelled GND on the main unit’s rear panel just below the antenna jack. Then
attach a wire from this screw to the nearest ship’s earth ground connection
point. The recommended wire to be used for such grounding is #10 AWG.
2.6 NMEA Data
The Ray54 accepts NMEA 0183 (V1.5) data from a position determining
device (such as a GPS) to provide the Latitude and Longitude position
information that is transmitted during a DSC Distress Call.
When valid NMEA signal is detected, the GPS indicator appears on the
LCD.When no valid NMEA signal is detected, the NO GPS indicator appears.
Connect the NMEA OUT + and NMEA OUT – signals from the positioning
device to the NMEA IN + (yellow) and NMEA IN – (green) wires in the
radio’s NMEA cable.
An example of how to connect the NMEA cables and power supply using a
suitable connector block is shown in the diagram below. For specific
instructions how to connect your particular GPS, please refer to the
handbook that came with that device.
Figure 2-4: GPS Wiring