Difference between revisions of "Continuous Tone-Coded Squelch System"
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Revision as of 18:09, 12 February 2006
The Continuous Tone Coded Squelch System (CTCSS) has been in used in the Land Mobile Radio arena from the late 1960’s. It is known by a number of different trade names such as Private Line® (PL) by Motorola, Channel Guard® (CG) by General Electric and generically as Tone Squelch. It is a use of sub--audible frequency tone is part of the transmission. The land mobile industry started with some 38 sub-audible frequencies this has increased over the years to the more generally accepted 50. There is no generic standard tone number assignment or code letter to go with a particular tone; however, below is a chart of the commonly accepted 50 tones used at this time.
67.0 | 94.8 | 131.8 | 171.3 | 203.5 |
69.3 | 97.4 | 136.5 | 173.8 | 206.5 |
71.9 | 100.0 | 141.3 | 177.3 | 210.7 |
74.4 | 103.5 | 146.2 | 179.9 | 218.1 |
77.0 | 107.2 | 151.4 | 183.5 | 225.7 |
79.7 | 110.9 | 156.7 | 186.2 | 229.1 |
82.5 | 114.8 | 159.8 | 189.9 | 233.6 |
85.4 | 118.8 | 162.2 | 192.8 | 241.8 |
88.5 | 123.0 | 165.5 | 196.6 | 250.3 |
91.5 | 127.3 | 167.9 | 199.5 | 254.1 |
--Lou Maag 14:21, 3 Jan 2005 (EST)