CTCSS Tones

Continuous Tone-Coded Squelch System or CTCSS is used to reduce the annoyance of listening to other users on a shared two-way radio communications channel like UHF CB and is quite often referred to as tone squelch .

Where more than one user group is on the same channel, CTCSS filters out other users if they are using a different CTCSS tone or no CTCSS. Instead of turning on the receive audio for any signal, the two-way radio receiver’s audio turns on only in the presence of a signal AND the correct tone.

A carrier squelch or noise squelch receiver is unlocked and will let any signal in. A receiver with CTCSS locks out all signals except ones encoded with the correct tone.

Following is a list of the common CTCSS Code Numbers and Frequency

Code Number Frequency (Hz) Code Number Frequency (Hz)

oF OFF 20 131.8

1 67.0 21 136.5

2 71.9 22 141.3

3 74.4 23 146.2

4 77.0 24 151.4

5 79.7 25 156.7

6 82.5 26 162.2

7 85.4 27 167.9

8 88.5 28 173.8

9 91.5 29 179.9

10 94.8 30 186.2

11 97.4 31 192.8

12 100.0 32 203.5

13 103.5 33 210.7

14 107.2 34 218.1

15 110.9 35 225.7

16 114.8 36 233.6

17 118.8 37 241.8

18 123.0 38 250.3

19 127.3

Code Number	Frequency (Hz)	Code Number	Frequency (Hz)
oF	OFF	20	131.8
1	67.0	21	136.5
2	71.9	22	141.3
3	74.4	23	146.2
4	77.0	24	151.4
5	79.7	25	156.7
6	82.5	26	162.2
7	85.4	27	167.9
8	88.5	28	173.8
9	91.5	29	179.9
10	94.8	30	186.2
11	97.4	31	192.8
12	100.0	32	203.5
13	103.5	33	210.7
14	107.2	34	218.1
15	110.9	35	225.7
16	114.8	36	233.6
17	118.8	37	241.8
18	123.0	38	250.3
19	127.3

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CTCSS Tones

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