Operator's Manual

RD68
36
E03912
The RD68 has five electrical connections - the handset/fistmike
socket is on the front panel below the LCD display (Fig 4.4A).
The other four are situated on the back of the case - the antenna
socket is on the left (Fig 4.4B). DC power is supplied to the set
via a two core flying lead (Fig 4.4C). The NMEA input connec-
tions (4.4D) allow a GPS to be interfaced, below which is a
3.5mm jack socket for an optional extension speaker (Fig 4.4E) -
this is covered by a weather plug when not in use.
The VHF requires a 12v DC supply to operate, and is supplied
with a power lead which incorporates an in-line 7.5 amp fuse.
This lead should be connected to the vessel’s power supply,
keeping the cable runs as short as possible. Although the radio
draws very little current when receiving, a heavier current is
drawn when transmitting which may result in a voltage drop if
long cable runs of inadequate core diameter are used. If the
supplied power lead is not long enough, an extension of up to
3m (10 ft) can be made using at least 2.5mm
2
(13AWG) wire.
The red wire is positive and black is negative. If polarity is
accidentally reversed, the set is protected but the fuse will
blow. Ensure that it is replaced with a fuse of the correct 7.5
amp rating. The radio is designed to be easily removable for
storage or security, so leave an adequate length of cable to ease
disconnection. The flying lead from the rear of the radio can
then be plugged into the power supply lead. Note that the
configuration of the plug prevents incorrect connection.
A- Handset/
Fistmike
B- Antenna
C- 12v DC
E- Extension
Speaker
Fig 4.4 - External connections
D- NMEA