1:CTCSS
Continuous Tone Coded Squelch System (CTCSS) is used with Amateur Radio, FRS, GMRS, Business Band, and other systems. When you select this option, the scanner only opens squelch when a matching CTCSS tone is present on the frequency.
2:DCS
Digital Coded Squelch is similar to CTCSS, but instead of differentiating codes using frequencies, DCS always uses the same frequency but encodes it with a binary value. When you select this option, the scanner only opens squelch when a matching DCS value is present on the frequency.
3:OFF
The scanner opens squelch regardless of the presence of tones.
Note: If, instead of pressing E to select a tone you press L/O, the scanner will stop on any transmission except for those with the selected tone.
Setting Beep Alert
2:SCAN OPTION → 1:CONVENTIONAL → Channel No. → 4:BEEP ALERT
1:ON
The scanner sounds three alert tones when it stops on a transmission on this channel.
2:OFF
Beep Alert is off.
Setting the Attenuator
2:SCAN OPTION → 1:CONVENTIONAL → Channel No. → 5:ATTENUATOR
If you are near a very strong signal source, the signal can overload the scanner’s RF front end, causing poor audio quality or missed reception.
1:ON
RF attenuation is on for the channel
2:OFF
RF attenuation is off for the channel
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