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22 Functional Description TB7100 Installation and Operation Manual

The block diagram illustrates the main inputs and outputs for power, RF

and control signals, as well as the interconnection between modules:

■ program data and audio from the PROG/MIC socket on the UI board to and

from the transmitter and receiver modules

■ audio and signalling from the SYSTEM connector to and from the

transmitter and receiver modules

■ RS-232 data from the serial data connector (IOIOI) to and from the

transmitter and receiver modules

■ fan power and control from the SI board

■ power distribution from the AC and DC power input connectors to the

transmitter and receiver modules, and from the receiver module to the

UI board.

The circuitry of the individual modules that make up the base station is

described in more detail in the following sections.

Frequency Bands

and Sub-bands

The circuitry of the transmitter and receiver modules is similar for all

frequency bands and is therefore covered by a single description in this

manual. Where the circuitry differs between bands, separate descriptions are

provided for each frequency band. For more information on frequency

bands, refer to the specifications manual.

RS-232 Signals External data communications all occur directly between the connected

computer (or other electrical equipment) and the transmitter and receiver

modules over the RS-232 serial lines.

Fan Signals The power and ground signals for the fans are routed from the SI board to

the fans behind the front panel. These signals are electrically isolated from

all other system signals to ensure fan noise is not transferred to other sensitive

system components.

If there is a fault in the fan circuitry, the transmitter module is protected from

overheating by its internal foldback circuitry.

Speaker Signal Received audio is sent from the receiver module to the UI board.

The volume is controlled by the volume potentiometer on the UI board.

The audio signal is routed through the UI board to the speaker for

monitoring purposes.

Power and Ground The SI board provides power to the transmitter and receiver modules.

The receiver modules provides power to the UI board.

Tait TB7100 Installation And Operation Manual

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