TB7100 Service Manual Functional Description 35
© Tait Electronics Limited October 2005
3.4.6 Transmitter Audio Processing
The SI board provides an external 600Ω balanced 4-wire line for connecting
4-wire circuits.
The SI board provides an unbalanced audio input and output for connecting
to other devices.
3.4.7 Opto Isolated Keying
External keying of the base station can be achieved using the current
regulated optically isolated keying connections.
3.4.8 Relay Output
The SI board can provide a relay output with a load voltage of 350V or load
current of 120mA continuous. The SI board can also provide a relay driver
output. Both these options are configurable and these settings are discussed
in the installation and operation manual.
3.4.9 Fan Control
There are three modes of operation for the fans. The modes are:
■ on continuous
■ on when transmitting
■ on at a pre-defined temperature.
The modes of operation are selected by links on the SI board. These settings
are discussed in the installation and operation manual.
3.4.10 RSSI
A received signal strength indication (RSSI) voltage is developed by the
receiver module and applied directly to the SI board rear panel.
3.4.11 Receiver Gate
The receiver gate signal is used by the SI board to control TOI and a relay
output. The receiver gate output on the S
YSTEM connector can be used for
external equipment such as TaitNet trunking controllers.
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