Table of Contents
Advertisement
6
TONE SQUELCH/DTCS
Operation
By default, the transceiver uses a CTCSS/DTCS squelch sys-
tem. The CTCSS tone squelch/DTCS opens only when re-
ceiving a signal containing a matching tone. You can silently
wait for calls from group members using the same tone.
q Push [Y] or [Z] to select the desired channel.
w Set the desired tone or code as described at right.
e Push [?] to turn the receive tone squelch ON.
• "
" disappears when the tone squelch is turned ON.
• Tone squelch or DTCS is always turned ON for some versions.
r When the received signal includes a matching tone,
squelch opens and the signal can be heard.
• When the received signal's tone does not match, tone squelch
does not open, however, the S-indicator shows signal strength.
• To open the squelch temporarily, push and hold [?].
NOTE: The transceiver has 50 CTCSS tone frequencies
and consequently their spacing is narrow compared with
units having 38 tones. Therefore, some tone frequencies
may receive interference from adjacent tone frequencies.
Tone frequencies or DTCS code settings are automatically
stored in memory channels for easy recall.
12
Setting a tone or code
50 CTCSS tones and 84 DTCS codes are available.
q Push [Y] or [Z] to select a channel.
w Push [
f
(CODE)].
• Current tone or code appears.
e Push [Y] or [Z] to select the
CTCSS tone frequency or
DTCS code.
• "–" appears when an inverse
DTCS code is selected.
r Push [
f
(CODE)] to exit.
CTCSS TONE FREQUENCY
No. Freq. No. Freq. No. Freq. No. Freq. No. Freq.
01
67.0
11
194.8
21
02
69.3
12
197.4
22
03
71.9
13
100.0
23
04
74.4
14
103.5
24
05
77.0
15
107.2
25
06
79.7
16
110.9
26
07
82.5
17
114.8
27
08
85.4
18
118.8
28
09
88.5
19
123.0
29
10
91.5
20
127.3
30
Inverse DTCS code
indication
T SQL
Channel
Tone frequency
number
or DTCS code
(Unit: Hz)
131.8
31
171.3
41
203.5
136.5
32
173.8
42
206.5
141.3
33
177.3
43
210.7
146.2
34
179.9
44
218.1
151.4
35
183.5
45
225.7
156.7
36
186.2
46
229.1
159.8
37
189.9
47
233.6
162.2
38
192.8
48
241.8
165.5
39
196.6
49
250.3
167.9
40
199.5
50
254.1
Advertisement
Table of Contents
Need help?
Do you have a question about the IC-F4SR and is the answer not in the manual?
Questions and answers