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Squelch (SQ) Mode
The scanner can be set to the following SQ modes.
• Carrier SQ mode (default setting)
The scanner will stop on any transmission or squelch opening, regardless of whether any
sub-audible tone has been programmed for the channel or search range.
• Tone SQ mode
The scanner will stop on any active frequency for which either no sub-audible tone has
been programmed or for which the user-programmed sub-audible tone is also active.
• Tone Search mode
During any transmission, the scanner will begin searching all possible sub-audible tones,
one of which may also be in use. The scanner counts up through the CTCSS tones and
instantly determines any possible DCS tone. See Page 83 for a listing of the tones that
the UBC780XLT decodes.
Note: When Tone Search is active in Scan Mode, once the CTCSS/DCS display flashes
a tone repeatedly (meaning that it has found the tone match), you can press E to
program that frequency with the captured tone. When you change the mode to
Tone Squelch from Tone Search, that frequency and tone will be programmed.
• Tone Lock (out) mode
For either a memory channel or a search range, you can lock a particular sub-audible
tone by pressing L/O after scrolling to the desired tone. The scanner will stop on any
transmission except those which may be using the locked sub-audible.
To set your scanner, enter into the menu mode.
1. Press MENU.
2. Press ▲ or ▼ to select SYSTEM DATA and then press E.
3. Press ▲ or ▼ to select SQ MODE and then press E.
4. Press ▲ or ▼ to select one type (CSQ, Tone SQ, Tone Search) and then press E.
5. To set Tone Lock mode, do the following first, then select Tone SQ in step 4.
1) For scan mode, enter CH DATA - CH No. - TONE DATA, select CTCSS/DCS with
▲ or ▼, set Tone Lock ON by pressing L/O.
2) For search mode, enter SEARCH EVENT - TONE DATA, select CTCSS/DCS with
▲ or ▼, set Tone Lock ON by pressing L/O.
Note: • CTCSS: Continuous Tone Coded Squelch System.
• DCS: Digital Coded Squelch.