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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
ch |
Hz |
CTCSS
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 |
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