Installation
- 10 -
English
Installation
Before installing the main unit in the vehicle, check and select the most convenient location, in
order that the radio will be easy to reach and comfortable to operate, without disturbing or
interfering with the vehicle drive. Use the supplied bracket and hardware to install the radio. The
bracket screws must be well tightened in order not to become loosen with the vehicle
vibrations. The car mounting bracket can be installed over or below the radio and the radio may
be inclined as desired according to the specific type of installation (under dashboard or track
cabin roof installation).
Installation of the Main Unit
Before connecting the radio to the vehicle electric system, make sure that radio is switched off,
with the OFF/VOL (11) knob completely turned counter clockwise at OFF position. The DC
power cable (16) of the radio is complete with a fuse holder with fuse located on the red positive
(+) wire. Connect the DC power cable to the vehicle electric system, with special attention to
respect correct polarity, even if the radio is protected against polarity inversion. Connect the red
wire to the positive (+) pole and the black wire to the negative (-) pole of the vehicle electric
system. Make sure that the wires and terminals are firmly and stably connected, in order to
prevent cables from disconnecting or causing short circuits.
Installation of the Antenna
A specific mobile antenna adjusted for 27 MHz frequency range must be used. The antenna
installation must be done by a specialised technician or service centre. Please pay special
attention to carefully install the antenna on the vehicle with perfect connection to ground. Before
connecting the antenna to the radio, it is necessary to check the correct operation of the
antenna with low standing wave ratio (S.W.R.), using adequate instruments. If not, the
transmitter circuit of the radio could be damaged. The antenna must be usually installed on the
highest part of the vehicle, free from obstacles and as far away as possible from any source of
electric or electromagnetic noise. The RF antenna coaxial cable must not be damaged or
pressed on its way between antenna and the radio. The correct operation of the antenna and
the low standing wave ratio (S.W.R.) must be checked periodically. Connect the RF antenna
coaxial cable to the antenna connector (15), located on the rear side of the radio.
Содержание M-790 plus
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Страница 36: ...Block Diagram 34 Italiano ...
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Страница 38: ...Notes 36 ...
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