CTCSS: Continuous Tone Coded Signalling System
ALAN 456 can receive in two modalities:
a) open traffic: in this case you will hear any communication
transmitted on the selected channel.
b) group modality CTCSS/DCS: CTCSS and DCS tones
are “access keys” that allow you to receive only messages
coming from parties using same channel and code.
Speaker will remain muted until the correct CTCSS or
DCS tone is received (further details will be explained in
the successive paragraphes).
To activate 38 different CTCSS tones in RX and TX follow
these steps:
1. Turn on the radio.
2. Press
button until “CTCSS” blinks on the display.
3. Select the desired tone (01/38) by the
/ keys.
4. Press
to confirm the operations.
Now the radio transmits and receives using the programmed
CTCSS tone.
If you don’t want CTCSS tones, select “00”.
Main Features 13
CTCSS TONE CHART
No Freq.(Hz)
01 67.0
02 71.9
03 74.4
04 77.0
05 79.7
06 82.5
07 85.4
08 88.5
09 91.5
10 94.8
11 97.4
12 100.0
13 103.5
No Freq.(Hz)
14 107.2
15 110.9
16 114.8
17 118.8
18 123.0
19 127.3
20 131.8
21 136.5
22 141.3
23 146.2
24 151.4
25 156.7
26 162.2
No Freq.(Hz)
27 167.9
28 173.8
29 179.9
30 186.2
31 192.8
32 203.5
33 210.7
34 218.1
35 225.7
36 233.6
37 241.8
38 250.3
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