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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 Call
A feature that allows you to call a selected individual,
intended to provide privacy and to eliminate the
annoyance of having to listen to conversations of no
interest to you.
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
Send Feedback
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
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.
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