Tait TM9456, Инструкция по установке и программированию

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TM9456 Dual-Radio Installation and Programming Guide Installing a Dual-Radio System 28
© Tait Limited July 2016
2.6 Connecting the Power Cables to a Power Source
To provide power to dual-radio systems, you must connect each radio body
separately to a power source or sources. Dual-radio systems do not
currently support a single lead-to-battery connection.
It is important to ensure that both radio bodies have a solid and secure
power supply. Unexpected behaviour can arise if the power supply to one
body operates at a lower voltage than the other, or is momentarily
interrupted, as might occur with a poorly formed or intermittent wiring
termination.
Notice Each radio is designed to operate from a nominal 12 V nega-
tive ground supply. Each radio may draw up to 15 A of current. Each
radio will tolerate a supply voltage range of 10.8 V to 16.0 V at the radio.
Selecting the Power
Source
In passenger vehicles, the radio system is always connected directly to the
battery.
In trucks, where direct connection to the battery is often not possible, each
radio can be connected to a suitable terminal inside the fuse box that is
connected directly to the battery.
24 V-to-12 V
Converter
In vehicles with a supply voltage larger than 16.0 V, such as many trucks, it
is essential to provide a suitably rated 24 V-to-12 V converter. This will
isolate the radios 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.
Table 2.3 Radio body power connector — pins and signals
Pinout Pin
Signal
name
Description Signal type
1 AGND Earth return for radio body power
source Ground
2 SPK– External speaker output. Balanced
load configuration Analog
3 SPK+ External speaker output. Balanced
load configuration Analog
4 13V8 BATT DC power input for radio body and
control head Power
rear view
>25 W radio
1 2 3 4
rear view
25 W radio