Tait TM9100 Installation Manual - 3.3
14
Installing the Radio
TM9100 110W Mobile Radio Installation Guide
© Tait LimitedOctober 2012
3.3
Connecting the Power Cable to the Power Source
Power is supplied to the 110W mobile via a cable with a DB15 connector
(provided). This plugs into the external RF amplifier, which provides power
to the back of the radio body via an internal loom.
Notice
This radio is designed to operate from a nominal 12V negative
ground supply and may draw up to 30A of current. The radio will tol-
erate a supply voltage range of 10.8V to 16.6V 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 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.
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
Notice
Although it is possible to connect the radio in line with the
vehicle ignition, this is not recommended, as it may draw too much cur-
rent 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.
Notice
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.
Notice
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.
Notice
Route the cable in a manner that minimizes coupling of elec-
tric vehicle systems such as alternators into the radio.
Notice
Protect the power cable from engine heat, sharp edges and
from being pinched or crushed.