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stations. A scanner equipped with CTCSS and DCS (like
your scanner) can code each received frequency with a
specific CTCSS or DCS frequency.
Then, when you receive multiple signals, you only hear the
transmission with the CTCSS or DCS tone you programmed.
If you do not receive the correct tone with a signal, the
scanner’s squelch remains closed and you hear nothing.
You can search for the following CTCSS frequencies and
DCS codes.
CTCSS Frequencies (Hz)
DCS Codes (Octal Code Numbers)