Busy Channel Lock; Key Beep - Oricom DTX4200 Operating Instructions Manual

Operations
Squelch Tail
Squelch Tail is the noise heard after the transmitting party releases the
PTT and is heard by the receiving party.
If Squelch tail is turned OFF, on both radios this squelch noise will be
muted.

Busy channel Lock

If the channel is already in use, you can prevent the UHF CB radio
from accidentally transmitting over a channel already in use. This is
particularly important when using CTCSS/DCS.

Key Beep

The key beep emits a tone when you press any of the buttons on the
microphone (except PTT button).
Logo Display
The logo display function can be enabled or disabled.
TPI
TPI Transmit Power Indicator
VSWR Voltage Standing Wave Ratio is a measurement of how well the
antenna (and cable) is matched to the radios output. It is best measured
at the antenna as the cable can affect this measurement.
TPI indicates the level of RF power delivered to the antenna connector.
This allows you to see how well the antenna is matched to the UHF
radio.
Generally a VSWR of less than 2 is an acceptable match.
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