7
4. Press
FUNC
, and then press
CL/CTCSS/DCS
to put the scanner in program
CTCSS/DCS mode.
5. Press ? or ? to select a CTCSS/DCS code. CTCSS/DCS code flashes.
The CTCSS/DCS code is changed below:
NO TONE -> CT 67.0 -> ... -> CT 254.1 -> DCS 023 -> ... -> DCS 754 -> CODE SRCH
-> OFF -> CT 67.0 -> ...
6. Press
ENT/PGM
to store the CTCSS/DCS code.
about CTCSS/DCS
CTCSS and DCS are subaudible tone signaling systems sometimes referred to as PL or
DPL (Motorola’s trademarked terms for Private Line and Digital Private Line respectively).
CTCSS and DCS are used only for FM signals and are usually associated with both
amateur and commercial two-way frequencies. These systems make use of a special
subaudible tone that accompanies a transmitted signal.
CTCSS and DCS are used for many purposes. In many cases, CTCSS and DCS are used
to restrict access to a commercial repeater, so that only those units which transmit the
correct tone along with their signal can “talk” to the repeater.
CTCSS and DCS are also used in areas that receive interference where there are several
stations with output frequencies close to each other. When this occurs, you might hear
multiple communications on the same 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)
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
DCS Codes (Octal)
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