Tait TB7100 - Page 22

22 Functional Description TB7100 Installation and Operation Manual
© Tait Electronics Limited December 2005
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.