34 Functional Description TB7100 Service Manual
© Tait Electronics Limited October 2005
3.4.1 Internal Power Distribution
This section details how the input power feed is distributed throughout the
base station to power its various sub-systems. Refer to Figure 3.8 for more
information.
13.8V DC The DC input is on the rear panel of the base station. The base station power
input is protected by a rear panel fuse. The 13.8V is distributed directly to
the receiver and transmitter boards and to the 13.8VDC output on the
S
YSTEM 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 P
ROG/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 Tait Electronics Ltd. proprietary protocol
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 the installation and operation manual.
3.4.4 Receiver 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 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 installation and operation manual. If enabled,
the output of the TOI is switched by the receiver gate.
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