The CTCSS selective calling system is defined according to EIA standard RS-220 and operates in the sub-audio range. Applying this Continuous Tone Controlled Squelch System stations may be selectively called either as a single user or as a group.
|
Parameter |
Value |
|
Frequency range |
VHF/UHF |
|
Operation modes |
Analogue Selcal |
|
Modulation |
FM, SUB Tone |
|
Receiver settings |
FM, BW = 12 kHz |
|
Input format(s) |
AF, IF |
Tone Allocation
|
Tone no. |
Freq. Hz |
Tone no. |
Freq. Hz |
Tone no. |
Freq. Hz |
|
1 |
60.0 |
19 |
118.8 |
37 |
183.5 |
|
2 |
67.0 |
20 |
120.0 |
38 |
186.2 |
|
3 |
69.3 |
21 |
123.0 |
39 |
189.9 |
|
4 |
71.9 |
22 |
127.3 |
40 |
192.8 |
|
5 |
74.4 |
23 |
131.8 |
41 |
196.6 |
|
6 |
77.0 |
24 |
136.5 |
42 |
199.5 |
|
7 |
79.7 |
25 |
141.3 |
43 |
203.5 |
|
8 |
82.5 |
26 |
146.2 |
44 |
206.5 |
|
9 |
85.4 |
27 |
151.4 |
45 |
210.7 |
|
10 |
88.5 |
28 |
156.7 |
46 |
218.1 |
|
11 |
91.5 |
29 |
159.8 |
47 |
225.7 |
|
12 |
94.8 |
30 |
162.2 |
48 |
229.1 |
|
13 |
97.4 |
31 |
165.5 |
49 |
233.6 |
|
14 |
100.0 |
32 |
167.9 |
50 |
241.8 |
|
15 |
103.5 |
33 |
171.3 |
51 |
250.3 |
|
16 |
107.2 |
34 |
173.8 |
52 |
254.1 |
|
17 |
110.9 |
35 |
177.3 |
|
|
|
18 |
114.8 |
36 |
179.9 |
|
|
A CTCSS controlled receiver only switches on, in case a carrier modulated with the pre-programmed CTCSS tone is received. For this system 52 tones are defined: