Kenwood TH-42A - Manual (Page 71)

Simplex channel
Refers to a communications channel where the receive
and transmit frequencies are the same.
Split channel
Refers to a communications channel where the receive
and transmit frequencies are not the same.
Squelch
A function that automatically mutes a receiver’s speaker
output when no receive signal is present. Functions
most reliably when communicating via full carrier modes
such as FM.
Squelch threshold level
The receive level at which a receiver’s speaker output is
muted. This level is usually adjustable, either manually
or automatically by the transceiver microcomputer.
Standard offset
Refers to a transmit frequency offset used to access
repeaters that is equal to the amount and direction
stipulated by existing band plans for a particular region.
See "Transmit offset".
Subaudible tone
A low-frequency non-audible signal superimposed on a
transmitted signal for the purpose of accessing some
types of repeaters.
SWR (standing wave ratio)
An antenna that is not correctly matched in impedance
with a transmission line and transmitter will reflect some
portion of the transmitted signal back toward the
transmitter. This causes a standing wave pattern to
develop. The ratio of maximum to minimum voltage
(VSWR) on the transmission line when such a condition
exists is commonly referred to as the SWR.
TO (Time-operated) Scan
When scanning, scan stops at all carriers received and
resumes after 5 seconds.
Tone Alert
A function that alerts an operator via a visual and audible
alarm when the receiver squelch opens.
Tone frequency
See "Subaudible tone",
TOT (Time-out Timer)
A function that automatically forces a transceiver from
Transmit back to Receive after timer expiration.
Transmit Inhibit
A function that stops a transceiver from transmitting.
The function has no effect on the receiver or receive
functions.
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