Raymarine RAY 210VHF - Manual (Page 22)

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It is recommended that lugs be used to connect the power cable to the DC
supply and that lugs should be both crimped and soldered. This is very important
in order to insure adequate current draw to the equipment. Intermittent operation
may result if an insufficient connection is made to the power source. The
connection terminals should be clean, with no sign of corrosion.
The RED (+) wire is connected to the positive terminal of the power source or
battery. The BLACK (-) wire is connected to the negative (ground) of the power
source or battery. Should the power connector be inadvertently reversed, the 10
amp. in-line fuse located in the RED (+) wire will open. Check the input power
leads for correct polarity with a VOM (volt /ohm meter), reconnect the leads
observing correct polarity, and replace the fuse. Use the same rate and type fuse.
2.4.2 External Speaker Connections
The YELLOW (+) wire and GREEN (-) wire are used for connecting the
RAY210 to the external speaker. (Refer to Fig 2-4)
Four watts of audio output is provided for an external 4 ohm speaker. A suitable
speaker can be purchased from your local marine dealer.
Connect the YELLOW (+) wire and GREEN (-) wire with the speaker. The
internal speaker and the external speaker will sound simultaneously.
2.4.3 Antenna Connections
The coaxial cable to your VHF antenna is intended to be connected to the
antenna jack on the rear panel using a PL259 VHF type connector. The antenna
cable may be cut to the required length at installation. If a longer cable length is
required, RG-58 50-ohm coaxial cable or equivalent cable may be used for runs
up to a maximum of 50 feet. If the distance required is even greater, then we
recommend using low loss RG-213 or equivalent cable for the entire run in
order to avoid excessive losses in power output.
If the antenna connector is likely to be exposed to the marine environment, a
protective coating of grease (similar to Dow Corning DC-4) can be applied to
the connector before connecting it to the radio. Any other extensions or adapters
in the cable run should also be protected by silicon grease and then wrapped
with a waterproofing tape.
2.4.4 Antenna Mounting Suggestions
The best radio in the world is useless without a good antenna location. Mounting
the VHF antenna properly is very important because it will directly affect the
performance of your VHF radio. A standard VHF antenna that is designed for
use aboard boats should be used.