Battery Connection - Icom MOBILE RADIO Installation Manual

BATTERY CONNECTION

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Mobile transceivers are usually intended for direct connection
to the battery.
Before disconnecting the battery you need to be aware of
some possible problems:
i) Is the vehicle fitted with an alarm that may not operate
after re-connection?
ii) Is the vehicle fitted with any electronic circuit that may
malfunction after re-connection? (engine management,
traction control, braking control, etc.)
iii) If in doubt do not disconnect the battery. Take the vehicle
to an authorised service agent and ask them to connect
the transceiver power cables for you.
If the DC cables are not long enough they should only be ex-
tended using an equivalent size and type of cable and any
join must be capable of handling the specified current and be
well insulated.
Always try and route cables so that the total length is as short
as possible.
Connections should be made to the battery terminal connec-
tors and nowhere else in the vehicle wiring room.
If the vehicle uses a different battery voltage (24 volts, etc.)
then a DC-DC convertor must be used. Never try and con-
nect to an intermediate point on the battery, etc., that appears
to measure 12 volts.
TESTING
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Switch on transceiver and check that it functions OK.
Check the antenna matching with a VSWR meter, if possible,
adjust the antenna for a minimum value. (Don't forget that
doors etc may have an effect on the measured value!)
Switch on ignition (but not engine) and check that all instru-
ments, warning lights etc are displaying "normal" reading.
Now transmit and verify that nothing changes and that no in-
strument is disturbed.
If the transceiver is multi-mode, then repeat the test with all
AM/SSB and FM modes.
If the transceiver is multi-band, then repeat the test in all op-
erating bands.
In each case use the maximum RF power.
If there is ANY disturbance of the vehicle instrumentation then
stop and identify the source of the problem before continuing.
If the above tests have been completed without problem you
can proceed to the STATIC operational checks.
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