User's Manual

94
Glossary
Radio Frequency
(RF)
The part of the general frequency spectrum
between the audio and infrared light regions
(about 10 kHz to10,000,000 MHz).
Repeater A conventional radio feature, where you talk
through a receive/transmit facility (repeater),
that re-transmits received signals in order to
improve communications range and
coverage.
Selective Switch Any digital P25 traffic having the correct
Network Access Code and the correct
talkgroup.
Squelch Special electronic circuitry added to the
receiver of a radio which reduces, or
squelches, unwanted signals before they are
heard in the speaker.
Standby An operating condition whereby the radio’s
speaker is muted but still continues to receive
data.
Tactical/Non-revert The user will talk on the channel that was
selected before the radio entered the
emergency state.
Talkaround Bypass a repeater and talk directly to another
unit for easy local unit-to-unit
communications.
Talkgroup An organization of radio users who
communicate with each other.
Trunking The automatic sharing of communications
paths between a large number of users. (See
Conventional.)
Zone A grouping of channels.