14
Installing the Radio
TM9100 Mobiles: 110 W Mobile Installation Guide
© Tait Electronics Limited
October 2005
4.3
Connecting the Power Cable to the Power Source
Power is supplied to the 110 W mobile via a cable with a DB25 connector
(provided). This plugs into the external RF amplifier, which provides power
to the back of the radio body via an internal loom.
Important
This radio is designed to operate from a nominal 12 V
negative ground supply and may draw up to 30 A of current.
The radio will tolerate a supply voltage range of 10.8V to
16.6 V at the radio.
Selecting the Power
Source
In passenger vehicles, the radio is always connected directly to the battery.
In trucks, where direct connection to the battery is often not possible, the
radio can be connected to a suitable terminal inside the fuse box that is
connected directly to the battery.
24V-to-12V
Converter
In vehicles with a supply voltage larger than 16.0V, such as many trucks, it
is essential to provide a suitably rated 24 V-to-12 V converter. This will
isolate the radio from excessive battery voltage and provide the correct DC
operating conditions. Note that most 24 V-to-12 V converters already fitted
are not rated sufficiently.
Standby Current
When using the ignition signal to turn off the radio, the standby current is
reduced to <3mA. Otherwise, the standby current is 50mA.
Connecting the
Power Cable
Important
Although it is possible to connect the radio in line with the
vehicle ignition, this is not recommended, as it may draw
too much current and damage the vehicle wiring and
steering column or ignition switch. This may also cause the
supply voltage of the radio to drop below the specified level.
Important
Disconnecting the vehicle’s battery may cause problems
with some electronic equipment, such as vehicle alarms,
engine management systems, and in-car entertainment
systems. Check that the vehicle owner has the necessary
information to make all electronic equipment function
correctly after battery reconnection.
Important
If the battery is not disconnected, exercise extreme caution
during the installation and install the fuses only when the
installation is ready to be checked. For more information,
refer to
“Checking the Installation” on page 22
.
1.
Disconnect the vehicle’s battery unless specifically prohibited from
doing so by the customer, vehicle manufacturer, agent, or supplier.
Important
Route the cable in a manner that minimizes coupling of
electric vehicle systems such as alternators into the radio.
