Difference between revisions of "Continuous Tone-Coded Squelch System"
From The RadioReference Wiki
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* [http://www.repeater-builder.com/tech-info/ctcss/ctcss-overview.html CTCSS Technical Overview] | * [http://www.repeater-builder.com/tech-info/ctcss/ctcss-overview.html CTCSS Technical Overview] | ||
* [[Tone Signaling]] | * [[Tone Signaling]] | ||
+ | * For the current ETSI Standard TS 103 236 Continuous Tone Controlled Signalling System (CTCSS) and Digitally Coded Squelch Signalling (DCSS) document click on the ''Standards'' tab [http://www.etsi.org/technologies-clusters/technologies/digital-mobile-radio on this page.] | ||
[[Category:RR Glossary]] | [[Category:RR Glossary]] |
Revision as of 14:27, 31 March 2014
The Continuous Tone Coded Squelch System, commonly referred to as 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 tones that are transmitted along with the speech portion of the transmission which allows more than one agency (or fleet) to use the same radio frequency without causing undue interference to another agency on the that frequency. Receivers for agency XYZ are set to only open their audio squelch when the proper 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.
In addition to the standard tones, some manufacturers have made available additional tone frequencies specific to their own products, but not available to products from other manufacturers.
Contents
Standard CTCSS Tones
Tone | Motorola Code | RELM Code | Wolfsburg Code | Tone | Motorola Code | Wolfsburg Code | RELM Code |
None | None | 000 | 0 | 167.9 | 6Z | 33 | 027 |
67.0 | XZ | 001 | 1 | 173.8 | 6A | 34 | 028 |
71.9 | XA | 002 | 2 | 179.9 | 6B | 35 | 029 |
74.4 | WA | 003 | 3 | 186.2 | 7Z | 36 | 030 |
77.0 | XB | 004 | 4 | 192.8 | 7A | 37 | 031 |
79.7 | WB | 005 | 5 | 203.5 | M1 | 38 | 032 |
82.5 | YZ | 006 | 6 | 210.7 | M2 | none | 033 |
85.4 | YA | 007 | 7 | 218.1 | M3 | none | 034 |
88.5 | YB | 008 | 8 | 225.7 | M4 | none | 035 |
91.5 | ZZ | 009 | 11 | 233.6 | none | none | 036 |
94.8 | ZA | 010 | 12 | 241.8 | none | none | 037 |
97.4 | ZB | 011 | 13 | 250.3 | none | none | 038 |
100.0 | 1Z | 012 | 14 | 69.4 | WZ | none | 039 |
103.5 | 1A | 013 | 15 | 159.8 | none | none | 040 |
107.2 | 1B | 014 | 16 | 165.5 | none | none | 041 |
110.9 | 2Z | 015 | 17 | 171.3 | none | none | 042 |
114.8 | 2A | 016 | 18 | 177.3 | none | none | 043 |
118.8 | 2B | 017 | 21 | 183.5 | none | none | 044 |
123.0 | 3Z | 018 | 22 | 189.9 | none | none | 045 |
127.3 | 3A | 019 | 23 | 196.6 | none | none | 046 |
131.8 | 3B | 020 | 24 | 199.5 | none | none | 047 |
136.5 | 4Z | 021 | 25 | 206.5 | 8Z | none | 048 |
141.3 | 4A | 022 | 26 | 229.1 | 9Z | none | 049 |
146.2 | 4B | 023 | 27 | 254.1 | 0Z | none | 050 |
151.4 | 5Z | 024 | 28 | 150.0 | none | none | See Note |
156.7 | 5A | 025 | 31 | ||||
162.2 | 5B | 026 | 32 |
Note: 150.0 is the standard tone used by military radios in the 30-88 MHz band.
Non-Standard CTCSS Tones (Kenwood)
105.4 | 109.1 | 129.6 | 134.2 | 138.9 | 143.8 |
148.8 | 150.0 | 159.5 | 165.1 | 165.5 | 170.9 |
171.3 | 176.9 | 183.1 | 189.5 | 198.2 | 213.8 |
221.3 | 237.1 | 245.5 |
Sound Card Decoding Programs
These programs will display the a detected CTCSS tone when connected to the audio output of a radio receiver.
Related Links
- CTCSS Technical Overview
- Tone Signaling
- For the current ETSI Standard TS 103 236 Continuous Tone Controlled Signalling System (CTCSS) and Digitally Coded Squelch Signalling (DCSS) document click on the Standards tab on this page.