User Manual CM70
Page 9 of 68
Installation
Before installing the main unit in a vehicle, check and select the most convenient location, so the radio will
be easy to reach and comfortable to operate, without disturbing or interfering with operating the vehicle.
Use the supplied bracket and hardware to install the radio. The bracket screws must be well tightened in
order not to become loose with vehicle vibrations. The car mounting bracket can be installed above or below
the radio and the radio may be tilted as desired according to the specific type of installation (under
dashboard or track cabin roof installation).
Installation of Main Unit
Before connecting the radio to the vehicles electrical system, ensure that radio is switched off. The DC
power cable is complete with a fuse holder (fuse located on the red positive (+) wire). Connect the DC
power cable to the vehicles electrical system, pay special attention to 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 vehicles electrical system. Ensure that wires and terminals are firmly 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 carried out by a specialist technician or service centre. Please take special care to fully install the antenna
on the vehicle with a 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 is 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,
located on the rear side of the radio.
Operational Test
Once the radio has been connected to the vehicles power supply and the antenna is installed, the operation
of the system can be check and tested. Please proceed as follows:
1.) Make sue the unit is installed correctly.
2.) Check that the power cable is fitted correctly.
3.) Check that RF antenna coaxial connector is correctly fitted.
4.) Fit the microphone to the front panel connector.
5.) Power on the unit and select correct Frequency band for country of use. (see page 10)
6.) Adjust the squelch to be open (noise from speaker) via mode key, select SQ and use
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