38 Functional Description TB7100 Installation and Operation Manual
© Tait Electronics Limited December 2005
the receiver and transmitter boards and to the 13.8VDC output on the
SYSTEM connector, rated at 1.5A. The 13.8VDC is also used to power the
fans, via control circuitry.
Note The UI board obtains 13.8V and 3.3V from the receiver module
and outputs 13V8_SW to the
PROG/MIC connector.
3.3V, 4.5V, 9V, 13.8V The other voltages derived on the SI board are used only on the SI board.
3.4.2 Serial Data
THSD Tait High Speed Data (THSD) is a proprietary protocol of Tait Electronics
Limited that can be used with the base station. This allows the base station
configured in either data repeater or data modem modes to pass data speeds
up to 12kbps on a narrow-band channel and 19.2kbps on a wide-band
channel. 1200-baud Fast Frequency Shift Keyed (FFSK) data is also available
as an option.
3.4.3 General Purpose IO
The transmitter and receiver boards can be programmed to act upon signals
from the SI board and also outputs signals for certain conditions.
These settings are discussed in “Preparation for Operation” on page 77.
3.4.4 Receiver Audio Processing
The SI board provides an external 600Ω balanced 4-wire line for connecting
4-wire circuits of which two are used by the receiver for receive audio.
The SI board provides an unbalanced audio output for connecting to other
devices. Output levels can be set via the rear panel.
3.4.5 Tone On Idle
The tone-on-idle (TOI) frequency is generated by the SI board and fed
directly to the receiver line out. It is enabled using links on the SI board.
These settings are discussed in “Preparation for Operation” on page 77.
If enabled, the output of the TOI is switched by the receiver gate.
3.4.6 Transmitter Audio Processing
The SI board provides an external 600Ω balanced 4-wire line for connecting
4-wire circuits of which two are used by the transmitter for transmit audio.
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