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  EFJ Call-Guard tone chart
Compiled and HTML'd by Mike Morris WA6ILQ
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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
* ØZ: Thats a zero, then the letter "Z"
* The 69.3 Hz tone is a non-standard tone. The manufacturers that did make it available used 69.4, and in many cases the Johnson radios would be flaky or just not work with other manufacturers 69.4 equipment.


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The programmable radios like the Challenger use a different tone
numbering scheme... the 69.3 tone (tone 39) 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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Page created 10-Jul-2006


Artistic layout and hand-coded HTML © Copyright 2006 and date of last update by Mike Morris WA6ILQ

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.