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  Hot News - What is CTCSS?

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What is CTCSS?
CTCSS stands for Continuous Tone Coded Squelch System.
Interference-Elimination Codes, sometimes refer to Tone Squelch, TalkGroup or Privacy Code. 
It works like Key and Lock on Door. Walkie Talkie transmits sub-audible tone (Key) and opens the door (Lock) on Receiver. For example: Group A on Ch1 no CTCSS, Group B on Ch1 Code1, Group C on Ch1 Code38. Group B won/'/t be bothered by Group A (no Keys) C (wrong Key).  Group A can hear all groups because no Lock (incoming door is open).

Keep in mind that this feature doesn/'/t actually protect your privacy. As you see Group A who turned off CTCSS can hear all in the same channel. In addition, anyone who has chosen the same channel and code as you can still transmit to your radio.

 

CTCSS 38ch Standard Frequency Table

CTCSS
FRS No.
Hz CTCSS
FRS ch
Hz
1 67.0 20 131.8
2 71.9 21 136.5
3 74.4 22 141.3
4 77.0 23 146.2
5 79.7 24 151.4
6 82.5 25 156.7
7 85.4 26 162.2
8 88.5 27 167.9
9 91.5 28 173.8
10 94.8 29 179.9
11 97.4 30 186.2
12 100.0 31 192.8
13 103.5 32 203.5
14 107.2 33 210.7
15 110.9 34 218.1
16 114.8 35 225.7
17 118.8 36 233.6
18 123.0 37 241.8
19 127.3 38 250.3

CDCSS  

Standard(N)     Standard(N)     Standard(N)     Standard(N)  
23 23 143 143   266 465 465
25 25   145 271 271 466 466
26 26 152 152   274 503 503
31 31 155 155 306 306 506 506
32 32 156 156 311 311 516 516
  36 162 162 315 315 532 532
43 43 165 165   325 546 546
47 47 172 172 331 331 565 565
51 51 174 174   332 606 606
  53 205 205 343 343 612 612
54 54   212 346 346 624 624
65 65 223 223 351 351 627 627
71 71   225   356 631 631
72 72 226 226 364 364 632 632
73 73 243 243 365 365 654 654
74 74 244 244 371 371 662 662
114 114 245 245 411 411 664 664
115 115   246 412 412 703 703
116 116 251 251 413 413 712 712
  122   252 423 423 723 723
125 125   255 431 431 731 731
131 131 261 261 432 432 732 732
132 132 263 263 445 445 734 734
134 134 265 265 464 464 743 743
  754 754

 

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