Continuous Tone-Coded Squelch System - List of Tones

List of Tones

CTCSS tones are standardized by the EIA/TIA. The full list of the tones can be found in their standard RS-220; the CTCSS tones also may be listed in equipment manuals. Some systems use non-standard tones. The US Military uses 150.0 Hz, as do many other world military users, also note that in the UK the tone of 100.0 Hz is avoided since this is twice the UK mains frequency; an inadequately-smoothed power supply may cause unwanted squelch opening. Squelch tones typically come from one of three series as listed below along with the two character PL code used by Motorola to identify tones. The most common set of supported squelch tones is a set of 38 tones including all tones with Motorola PL codes, except for the tones WZ, 8Z, 9Z, and 0Z. The lowest series has adjacent tones that are roughly in the harmonic ratio of 20.05 to 1 (≈1.035265), while the other two series have adjacent tones roughly in the ratio of 100.015 to 1 (≈1.035142).

NS1 PL Hz
1 XZ 67.0
WZ 2 69.3
2 XA 71.9
3 WA 74.4
4 XB 77.0
5 WB 3 79.7
6 YZ 82.5
7 YA 85.4
8 YB 88.5
9 ZZ 91.5
10 ZA 94.8
11 ZB 4 97.4
NS1 PL Hz
12 1Z 100.0
13 1A 103.5
14 1B 107.2
15 2Z 110.9
16 2A 114.8
17 2B 118.8
18 3Z 123.0
19 3A 127.3
20 3B 131.8
21 4Z 136.5
22 4A 141.3
23 4B 146.2
24 5Z 151.4
25 5A 156.7
26 5B 162.2
27 6Z 167.9
28 6A 173.8
29 6B 179.9
30 7Z 186.2
31 7A 192.8
199.5
8Z 5 206.5
   6 213.8
   6 221.3
9Z 5 229.1
   6 237.1
   6 245.5
0Z 5 254.1
NS1 PL Hz
159.8
165.5
171.3
177.3
183.5
189.9
196.6
32 M1 203.5
33 M2 210.7
34 M3 218.1
35 M4 225.7
36 M5 233.6
37 M6 241.8
38 M7 250.3
Notes
1 Non-standard numerical codes. Many radios use a matching set of numerical codes to represent corresponding tones; however, there is no published standard and only partial industry adoption.
2 Some radios use 69.4 Hz instead, which better fits the harmonic sequence, and this tone is often omitted as a choice.
3 Also known by the code SP.
4 Not actually in this harmonic sequence, but an average of the ZA and 1Z tones used to fill the gap between the lower and middle sequences. 98.1 Hz would be the tone after ZA, and the tone before 1Z would be 96.6 Hz, assuming the same harmonics were used.
5 The 8Z, 9Z, and 0Z ("zero-Z") tones are often omitted from radios that use the M1-M7 series of tones.
6 Not known to have been used, but included to place the 9Z and 0Z tones in the proper position in the harmonic series.

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