E F Johnson Company 2425770 Benutzerhandbuch

Viking Portable 600 Radio Operating Manual

5-3

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, "Selective Squelch Code Select 
(CTCSS / DCS / NAC)").

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 
5.13) 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).

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.