http://info.aprs.net/index.php?title=CTCSS&feed=atom&action=history 2013-05-22T18:56:23Z Revision history for this page on the wiki MediaWiki 1.19.2 http://info.aprs.net/index.php?title=CTCSS&diff=947&oldid=prev 2009-02-01T11:33:30Z

<p>New page: &#039;&#039;&#039;CTCSS&#039;&#039;&#039; - &#039;&#039;&#039;C&#039;&#039;&#039;ontinuous &#039;&#039;&#039;T&#039;&#039;&#039;one-&#039;&#039;&#039;C&#039;&#039;&#039;oded &#039;&#039;&#039;S&#039;&#039;&#039;quelch &#039;&#039;&#039;S&#039;&#039;&#039;ystem. In telecommunications, CTCSS is a circuit that is used to reduce the annoyance of listening to other use...</p> <p><b>New page</b></p><div>'''CTCSS''' - '''C'''ontinuous '''T'''one-'''C'''oded '''S'''quelch '''S'''ystem. <br /> <br /> In telecommunications, CTCSS is a circuit that is used to reduce the annoyance of listening to other users on a shared two-way radio communications channel. Where more than one user group is on the same channel, (called co-channel users,) CTCSS filters out other users if they are using a different CTCSS tone or no CTCSS.<br /> <br /> Instead of turning on the receive audio for any signal, the two-way radio receiver's audio turns on only in the presence of a signal AND the correct tone. This is akin to the use of a lock on a door. A carrier squelch or noise squelch receiver is unlocked and will let any signal in. A receiver with CTCSS locks out all signals except ones encoded with the correct tone. CTCSS can be regarded as a form of in-band signaling.</div>

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