Installation manual

Page 11
Electrical connections
It is recommended that this guideline for electrical connection of the F1 DSC
Radiotelephone is followed as carefully as possible. A careless installation is likely to
degrade performance of the radio and cause difficulties for the operator. Most radio
installations will be undisturbed for many years so it is therefore important that the
materials chosen are suitable for use onboard ship where they will be in contact with
the harsh environment onboard.
The radio will operate when it is connected to the power supply and to the antenna.
These are the only two connections which are necessary for full functionality of the
radio. However, if the radio is connected to a GPS source, position information stored
in the radio will be automatically updated at regular intervals and it will not be
necessary to update this position manually. Connection to a GPS will ensure that the
position transmitted in a DSC distress call is as accurate as possible.
In an environment with considerable electrical noise the earth screw at the rear of the
radio should be connected to a common earth point. This is particularly important when
the radio is installed together with MF/HF radios. It is also advisable to route power,
data and antenna cables away from sources of electrical noise such as an engine.
An external loudspeaker can be connected to the two central pins in the power plug
(see page 13). The external loudspeaker can be switched on/off via the Speaker
Settings (in Profiles).
An additional fist mike can be connected via the 15 pole D-sub connector at the rear of
the radio. This additional connection is in parallel with the fist mike attached to the front.
Connection of power supply
The power supply is connected as shown. If it is necessary to extend the wires from the
connector, the wire dimensions should be as specified.
The nominal power supply voltage is 12V. The radio will operate over the supply range
of 10.8 VDC to 15.6 VDC. If it is necessary to connect the radio to a 24V battery, a 24V
to 12V voltage converter must be used.
The F1 DSC Radiotelephone is protected against reverse voltage polarity by an internal
diode and fuse. If reverse polarity is applied to the radio the internal fuse will open (fail)
and must then be replaced by a service agent.
WARNING: You must fit an external inline fuse with a 10A fast blow rating in the
positive (plus) supply cable (see page 12).
CAUTION: The battery negative or positive terminal must not be connected to
the earth screw under an
y
circumstances
,
as this ma
y
cause electrol
y
tic corrosion.
WARNING: The F1 DSC Radiotelephone will in most cases be connected to the
ship's battery. During installation special care must be taken not to short the battery
terminals as this can cause severe burns, or in the worst case can cause a fire.