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Instruction Manual
37
E03912
The antenna is connected to the radio using a standard PL259
type connector as fitted to most marine antennae. If fitting to
an existing antenna, check that the contacts are not corroded
before connecting, as this will affect the quality of the signal.
Ensure that the retaining collar of the antenna plug is securely
tightened to prevent accidental disconnection.
For NMEA interfacing to an external navigation source (eg a
GPS, Loran or chart plotter), the RD68 is supplied with a 1m
cable assembly which plugs into the lead at the back of the
radio. The other end is connected to the navigator as follows -
Wire colour
To navigator connections -
Red
NMEA OUT Data (+)
Blue
NMEA OUT Common (-)
NOTE
If the navigator does not have a dedicated NMEA common
terminal, the blue wire should be connected to the 0v terminal of
the navigator.
The extension speaker socket takes a standard 3.5mm jack plug.
The speaker used must have a minimum impedance of 8
Ω
.
4.2 Antenna installation recommendations
The most important factor in the performance of the radio will
be the quality and positioning of the antenna. Most recorded
problems with VHF radios are related to poor antenna siting,
faulty cabling, poor quality cable joints and low voltage supply.
Even a VHF as highly advanced as the RD68 cannot compen-
sate for these factors. Therefore, if replacing an existing VHF
installation, it is important that the antenna is thoroughly
checked for any faults or damage before use.
As the range of VHF signals are governed by line of sight (see
section 4.2), the antenna should be placed as high as possible,
while remaining clear of any metallic objects that could influ-
ence the resonance of the antenna.
Fig 4.5 - Linking to navigation source
Red -
Data Out
Blue -
Common
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