Raymarine Ray240 User Manual page 54

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The Ray240 base transceiver does not have an ON/OFF switch. It is therefore
strongly recommended that your radio is connected to the boat's power supply
through a dedicated power breaker to avoid unnecessary drain on the electrical
system when your boat is not in use.
To ensure that the unit works correctly:
• You should connect the power cable to the DC supply using lugs (not supplied)
that have been crimped and soldered.
Grounding
• Connect the negative wire to battery negative.
The negative power wire must be connected to battery negative.
(Ideally the battery will be bonded to a common ground point directly
adjacent to the battery itself.)
• DO NOT connect the metal heat sink to RF ground.
The exposed metal heatsink on the Ray240 VHF is internally connected to
battery negative. No connection is required to the heatsink ground terminal.
Connecting the metal heatsink to RF Ground or to the vessel's grounded
metal structures will allow stray currents to flow that could cause or
accelerate corrosion of metal fittings.
• Isolate heatsink from metal objects and surfaces.
Ensure adequate space around the metal heatsink, in particular you must
avoid contact with any metal object or surface. If necessary mount the VHF on
an isolating plate made of plastic or wood.
• Isolate the antenna connector from metal objects and surfaces.
The antenna connector (outer conductor) and coaxial cable screen are
connected to the metal heatsink. Ensure the antenna connector and coaxial
cable screen are isolated from any metalwork, including the mast (some
metal antenna brackets may not be suitable).