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19
Understanding Scanning
might hear multiple communications at the same time.
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.
Local frequency allocation groups set cooperative
standards to establish the CTCSS and DCS tone for each
transmitter (or repeater).
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