On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:
On Thu, 27 Nov 2008 12:57:42 +0000, Dave wrote:

JosephKK wrote:
On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".
Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

No decoding involved. It's a tone that unsquelches an FM radio.

Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS

Have you read your own references?

Bottom line, most any tunable tone decoder.