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20
Understanding Scanning
frequency. The stations might even interfere with each
other to the point where it is impossible to clearly receive
any of the stations. A scanner equipped with CTCSS and
DCS (like your scanner) can code each received
frequency with a specific CTCSS or DCS frequency.
Then, when you receive multiple signals, you only hear
the transmission with the CTCSS or DCS tone you
programmed. If you do not receive the correct tone with a
signal, the scanner’s squelch remains closed and you
hear nothing.
You can search for the following CTCSS frequencies and
DCS codes.
CTCSS Frequencies (Hz)
DCS Codes (Octal)
67.0 69.3 71.9 74.4 77.0 79.7
82.5 85.4 88.5 91.5 94.8 97.4
100.0 103.5 107.2 110.9 114.8 118.8
123.0 127.3 131.8 136.5 141.3 146.2
151.4 156.7 159.8 162.2 165.5 167.9
171.3 173.8 177.3 179.9 183.5 186.2
189.9 192.8 196.6 199.5 203.5 206.5
210.7 218.1 225.7 229.1 233.6 241.8
250.3 254.1
023 025 026 031 032 036 043 047
051 053 054 065 071 072 073 074
114 115 116 122 125 131 132 134
143 145 152 155 156 162 165 172
174 205 212 223 225 226 243 244
245 246 251 252 255 261 263 265
266 271 274 306 311 315 325 331
332 343 346 351 356 364 365 371
411 412 413 423 431 432 445 446