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Icom CTCSS Tone Chart |
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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!
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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
Last revised 25-May-2016
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.