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If CTCSS / Private Line / Channel Guard is a new topic top you I suggest three articles on the Tech Info Index page at this web site:
1) A Historical and Technical Overview of Tone Squelch Systems — A primer on tone systems, with a little on digital systems.
2) CTCSS Doesn't Fix Anything! — Why PL, CG or CTCSS is NOT a cure for interference.
3) A Chart of CTCSS Tone Numbers — Tone numbers are useless!

Freq. Code Icom Tone #
Others H16 / U16
67.0 XZ 1 1
71.9 XA 2 2
74.4 WA 3 3
77.0 XB 4 4
79.7 WB 1 5 5
82.5 YZ 6 6
85.4 YA 7 7
88.5 YB 8 8
91.5 ZZ 9 9
94.8 ZA 10 10
97.4 ZB 11 Missing 2
100.0 1Z 12 11
103.5 1A 13 12
107.2 1B 14 13
110.9 2Z 15 14
114.8 2A 16 15
118.8 2B 17 16
123.0 3Z 18 17
127.3 3A 19 18
   
Freq. Code Icom Tone #
Others H16 / U16
131.8 3B 20 19
136.5 4Z 21 20
141.3 4A 22 21
146.2 4B 23 22
151.4 5Z 24 23
156.7 5A 25 24
162.2 5B 26 25
167.9 6Z 27 26
173.8 6A 28 27
179.9 6B 29 28
186.2 7Z 30 29
192.8 7A 31 30
203.5 M1 32 31
210.7 M2 33 32
218.1 M3 34 33
225.7 M4 35 34
233.6 M5 36 35
241.83 M6 37 36
250.33 M7 38 37
254.13 0Z4 39 Missing2

Notes:
WB 1: On some tone charts the label "WB" is replaced with "SP".

Missing 2: The H16 and U16 were Icoms first microprocessor controlled radios with an integrated CTCSS encoder. The design has one flaw: they forgot the 97.4 Hz tone, and all tones above that frequency are moved down one number - i.e. tone 11 = 100 Hz, 12 = 103.5 Hz, etc all the way to tone 35 = 233.6 Hz.   These radios have two additional tones: 36 = 241.8 Hz ("M6") and 37 = 250.3 Hz ("M7").   Later radios added 97.4 Hz back into the tone list (this included the later production series 02 and 04 radios - they did 38 tones instead of 37).

241.83: Many earlier Icoms do not have 241.8 Hz, 250.3 Hz or 254.1 Hz.

0Z4: That's a zero, then the letter "Z".


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Page created August 2003 by Kevin Custer W3KKC

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.