14221-1850-2000, Rev. A
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4.24 MONITOR AND SQUELCH TYPES (CONVENTIONAL ONLY)
The monitor function allows you to temporarily turn off selected squelch to monitor for traffic that may not
normally break squelch. The type of squelch used depends on an analog or digital channel. A button on the
control head or KMM can be programmed to start or stop Monitor (see Section 6.4 for the various options
that can be programmed to the control head buttons).
For analog channels, there is:
• Noise squelch - any received signal breaks squelch.
• Continuous Tone Coded Squelch (CTCSS) - squelch is selective based on tone code.
• Continuous Digital Coded Squelch (CDCSS) - squelch is selective based on digital code.
For digital channels, there is:
• Monitor squelch - any received digital signal breaks squelch.
• Normal squelch - Received Network Access Code (NAC) must be correct to break squelch.
• Selective squelch - Received NAC and talkgroup Identification (ID) or unit ID must be correct to break
squelch.
During encrypted operations, the radio only unmutes when receiving with the same key.
4.25 NUISANCE DELETE
A channel can temporarily be deleted from the scan list. The selected channel, priority 1, and priority 2
channels cannot be nuisance deleted. A button on the control head or KMM can be programmed for
nuisance delete (see Section 6.4 for the various options that can be programmed to the control head buttons).
Nuisance delete can only be performed on the active scan list.
To perform a nuisance delete from the menu:
1. Press the Menu button.
2. Navigate to the SCAN menu.
3. Scroll up or down to highlight SCAN LISTS and press the Group/Channel Select Knob.
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