Tait TB8100, Service Manual

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296 Glossary TB8100 Service Manual
© Tait Electronics Limited September 2006
anti-kerchunking
Anti-kerchunking is a base station configuration that discourages users from
kerchunking.
B
balanced line
A balanced line has two wires carrying equal and opposite signals. It is
typically used in a line-connected base station for connecting to the
despatcher console. The system interface identifies the balanced line in as
Rx+ and Rx-, and the balanced line out as Tx+ and Tx-.
BCD
BCD (binary coded decimal) is a code in which a string of four binary digits
represents a decimal number.
C
Calibration Kit
The TB8100 Calibration Kit is a utility for defining the switching ranges of
the receiver and the exciter and for flattening the receiver response across its
switching range. It can also be used to calibrate various parts of the reciter
and the PA circuitry.
CCDI2
CCDI2 (computer controlled data interface version 2) is a proprietary Tait
command protocol used between computer equipment and a Tait radio.
channel
A channel is:
■
A frequency pair (or just a single frequency in a simplex system).
■
A set of configuration information that defines the frequency pair and
other settings. Also referred to as a channel configuration. Generally,
‘channel’ has this meaning in the Service Kit.
channel profile
A channel profile is a named set of configuration items relating to the base
station’s RF configuration, transmitter power output and power saving
modes. Like the signalling profile, it can be applied to any channel.
Together, these profiles define most configuration items.
channel spacing
Channel spacing is the bandwidth that a channel nominally occupies. If a
base station has a channel spacing of 12.5 kHz, there must be a separation of
at least 12.5 kHz between its operating frequencies and those of any other
equipment.
channel table
The channel table is the base station’s database of channel configurations. To
view it, select Configure > Base Station > Channel Table.
CODEC
An IC which combines analog-to-digital conversion (coding) and digital-
to-analog conversion (decoding).