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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.
Status Calls
Pre-defined text messages that allow the user to send a
conditional message without talking.
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.
TMS
Text Messaging Service.
Send Feedback
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.
USK
Unique Shadow Key.
UTC
Coordinated Universal Time. The international time
standard (formerly Greenwich Mean Time, or GMT).
Zero hours UTC is midnight in Greenwich, England,
which is located at 0 degrees longitude. Everything east
of Greenwich (up to 180 degrees) is later in time;
everything west is earlier. There are 42 time authorities
around the world that are constantly synchronizing with
each other. Abbreviated as UTC (English backronym =
Universal Time, Coordinated), it is also known as Zulu
(Z) Time.
Zone
A grouping of channels.
English
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