(send) operation when
pressed.
Radio Frequency
(RF)
The part of the general
frequency spectrum between
the audio and infrared light
regions (about 10 kHz to
10,000,000 MHz).
Repeater
A conventional radio feature,
where you talk through a
receive/transmit facility 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, that reduces, or cuts off,
unwanted signals before they
are heard in the speaker.
SSI
Synchronous Serial Interface
Standby
An operating condition whereby
the radio’s speaker is muted
but still continues to receive
data.
Tactical/ Non-
Revert
The user talks 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 or group of
radio users who communicate
with each other using the same
communication path.
Trunking
The automatic sharing of
communications paths between
a large number of users (see
Conventional).
Trunking Priority
Monitor Scan List
A scan list that includes
talkgroups that are all from the
same trunking system.
Glossary
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