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Back to Home 		  EFJ Call-Guard tone chart
Compiled, HTML'd and Maintained by Mike Morris WA6ILQ		   Print this Page

Donations of information, especially PDFs of manuals that we don't have would be greatly appreciated.
Your author / page maintainer has very little personal knowledge of this equipment.

E. F. Johnson company numbers their CTCSS tones, and you will find the tone numbers stamped on their tone elements, not the frequencies.

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Here's the list from the pre-synthesized days when the frequency
determining element was a small daughterboard that plugged onto
the tone board.

Tone
Freq (Hz)		 Tone
Code		 Tone
Number
67.0 XZ 1
69.3 * (none) 39
71.9 XA 2
74.4 WA 3
77.0 XB 4
79.7 WB 5
82.5 YZ 6
85.4 YA 7
88.5 YB 8
91.5 ZZ 9
94.8 ZA 10
97.4 ZB 11
97.4 ZB 11
100.0 1Z 12
103.5 1A 13
107.2 1B 14
110.9 2Z 15
114.8 2A 16
118.8 2B 17
123.0 3Z 18
127.3 3A 19
131.8 3B 20
   
Tone
Freq (Hz)		 Tone
Code		 Tone
Number
136.5 4Z 21
141.3 4A 22
146.2 4B 23
151.4 5Z 24
156.7 5A 25
162.2 5B 26
167.9 6Z 27
173.8 6A 28
179.9 6B 29
186.2 7Z 30
192.8 7A 31
203.5 M1 32
210.7 M2 33
218.1 M3 34
225.7 M4 35
233.6 M5 36
241.8  M6 37
250.3  M7 38
206.5 8Z 40
229.1 9Z 41
254.1 ØZ** 42
* The 69.3 Hz tone is a non-standard tone. Most other manufacturers followed the EIA standard and used 69.4, so in many cases the Johnson radios would work, be flaky or just did not work with the standard 69.4 Hz. equipment. It all depended on component tolerances.
** ØZ: Thats a zero, then the letter "Z"... it's what you get when 10Z gets truncated to two characters.

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The programmable radios like the Challenger use a different tone numbering
scheme... the 69.3 tone (tone 39) is skipped and the tones above
250.3 (40, 41 and 42) are dropped... (and tones 1-32 are identical
to a TS-32):

Tone
Freq (Hz)		 Tone
Code		 Tone
Number
67.0 XZ 1
71.9 XA 2
74.4 WA 3
77.0 XB 4
79.7 WB 5
82.5 YZ 6
85.4 YA 7
88.5 YB 8
91.5 ZZ 9
94.8 ZA 10
97.4 ZB 11
100.0 1Z 12
103.5 1A 13
107.2 1B 14
110.9 2Z 15
114.8 2A 16
118.8 2B 17
123.0 3Z 18
127.3 3A 19
  
Tone
Freq (Hz)		 Tone
Code		 Tone
Number
131.8 3B 20
136.5 4Z 21
141.3 4A 22
146.2 4B 23
151.4 5Z 24
156.7 5A 25
162.2 5B 26
167.9 6Z 27
173.8 6A 28
179.9 6B 29
186.2 7Z 30
192.8 7A 31
203.5 M1 32
210.7 M2 33
218.1 M3 34
225.7 M4 35
233.6 M5 36
241.8  M6 37
250.3  M7 38
Johnson's literature makes the point that subaudible tones above 200 Hz are not recommended due to the propensity for talk-off and falsing on lower pitched voices.

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Contact Information:

The author can be contacted at: his-callsign // at // repeater-builder // dot // com.



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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.