Connecting The Power Cable To The Power Source - Tait TM9155R Installation Manual

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
In passenger vehicles, the radio is always connected directly to the battery.
Selecting the Power
Source
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.
In vehicles with a supply voltage larger than 16.0V, such as many trucks, it
24V-to-12V
Converter
is essential to provide a suitably rated 24V-to-12V converter. This will
isolate the radio from excessive battery voltage and provide the correct DC
operating conditions. Note that most 24V-to-12V converters already fitted
are not rated sufficiently.
When using the ignition signal to turn off the radio, the standby current is
Standby Current
reduced to <3mA. Otherwise, the standby current is 50mA.
Important
Connecting the
Power Cable
Important
Important
1.
Important
14 Installing the Radio
This radio is designed to operate from a nominal 12V
negative ground supply and may draw up to 30A of current.
The radio will tolerate a supply voltage range of 10.8V to
16.6V at the radio.
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.
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.
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
Disconnect the vehicle's battery unless specifically prohibited from
doing so by the customer, vehicle manufacturer, agent, or supplier.
Route the cable in a manner that minimizes coupling of
electric vehicle systems such as alternators into the radio.
TM9100 Mobiles: 110 W Mobile Installation Guide
© Tait Electronics Limited October 2005
22.