CTCSS (Continuous Tone-Coded Squelch System) Codes
| CTCSS | Hz | CTCSS | Hz | CTCSS | Hz | ||
| 1 | 67.0 | 14 | 107.2 | 27 | 167.9 | ||
| 2 | 71.9 | 15 | 110.9 | 28 | 173.8 | ||
| 3 | 74.4 | 16 | 114.8 | 29 | 179.9 | ||
| 4 | 77.0 | 17 | 118.8 | 30 | 186.2 | ||
| 5 | 79.7 | 18 | 123 | 31 | 192.8 | ||
| 6 | 82.5 | 19 | 127.3 | 32 | 203.5 | ||
| 7 | 85.4 | 20 | 131.8 | 33 | 210.7 | ||
| 8 | 88.5 | 21 | 136.5 | 34 | 218.1 | ||
| 9 | 91.5 | 22 | 141.3 | 35 | 225.7 | ||
| 10 | 94.8 | 23 | 146.2 | 36 | 233.6 | ||
| 11 | 97.4 | 24 | 151.4 | 37 | 241.8 | ||
| 12 | 100.0 | 25 | 156.7 | 38 | 250.3 | ||
| 13 | 103.5 | 26 | 162.2 | 122* | 69.3 |
*Some radios use 69.4 Hz instead, which better fits the harmonic sequence, and this tone is often omitted as a choice.
CTCSS codes are functions that reject undesired signals on your channel. You will hear a call only when you receive a signal that contains a matching CTCSS tone or DCS code. If a call containing a different tone or code is received, squelch will not open and you will not hear the call. Likewise, when transmitting using CTCSS or DCS, the receiving station must have a matching tone or code to hear your call.Be aware that other parties can still hear your calls if they set up their transceiver with the same tone or code.