ES Series Models II/III Portable Radio Operating Manual
5-3
Conventional Mode Features
The Normal/Selective function disables Call Guard squelch and P25 group ID detect but
not scanning and P25 NAC detect (see Section 5.4.6).
5.3
Busy Channel Lockout
The Busy Channel Lockout feature (also called Transmit Disable on Busy) automatically
disables the transmitter if the channel is busy when the PTT switch is pressed. When the
transmitter is disabled by this feature, “Busy” is displayed, a busy tone sounds, and the
transmitter is disabled.
The Busy Channel Lockout feature can be programmed to operate as follows. Each
conventional channel can be programmed differently.
“Off” - Busy channel lockout is disabled and the transmitter keys even if the channel is
busy.
“Noise” - If a carrier is detected on the channel, the transmitter is disabled when the
PTT switch is pressed.
“Tone (NAC)” - If an incorrect Call Guard (CTCSS/DCS) or NAC code (see Section
5.14) is detected, the transmitter is disabled when the PTT switch is pressed. An
incorrect code is any code other than the one programmed for the current channel.
“Status” - Transmission is disabled if the repeater inbound channel busy status symbol
is detected.
“Talkgroup” - Prevents transmission during calls with a different NAC or talkgroup.
Transmission is allowed during data or short terminators with the correct NAC.
Applicable to Conventional Digital channels.
If Busy Channel Override is permitted by programming, it is possible to transmit even
when the transmitter is disabled by this feature. Release the PTT switch and then quickly
press it again (within one second).
5.4
Call Guard Squelch
Tone or digital Call Guard squelch (also called CTCSS/DCS signaling) can be
programmed on each conventional analog transmit and receive channel in any order
desired. The reverse burst and turn-off code are always transmitted and also detected on
channels programmed with Call Guard squelch.
Summary of Contents for 5100 ES
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