Tait TB7100, Installation And Operation Manual

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134 Glossary TB7100 Installation and Operation Manual
© Tait Electronics Limited December 2005
isolator
An isolator is a passive two-port device which transmits power in one
direction, and absorbs power in the other direction. It is used in a PA to
prevent damage to the RF circuitry from high reverse power, and reduces
the generation of spurious product due to the ingress of signals from other
transmitters.
K
kerchunking
Kerchunking is transmitting for a second or less without saying anything in
order to test the base station. This results in a ‘kerchunk’ sound.
keypress confidence
tone
A keypress confidence tone is a type of audible indicators given each time
the user presses a key to confirm that the action selected is valid.
L
LCD
A Liquid Crystal Display (LCD) is used on the TB7100 user interface to
display channel number.
line-controlled base
station
A TB7100 is a line-controlled base station when it receives audio (sending
it out via its systems interface), transmits audio received over its systems
interface, and its transmitter is keyed via the Tx Key line.
local squelch See city squelch.
M
Mandatory Settings
The mandatory settings are settings in the programming application that
must not be changed from their default states or the TB7100 will not
operate correctly. The Mandatory Settings in the receiver module are not
the same as those in the transmitter module.
mute
A mute controls the circumstances under which a received signal is passed
to the radio’s audio output. When a mute is active, the radio’s speaker audio
path opens under certain conditions, determined by the type of signalling
operating on a channel and the noise mute threshold.
N
noise mute
The noise mute feature ensures that the radio’s speaker only unmutes when
an intelligible signal is received. A signal is considered intelligible when it is
strong enough to exceed a predetermined noise mute threshold.
noise mute
threshold
The noise mute threshold is the level the signal must reach before it is
regarded as intelligible and the radio’s mute is opened.