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7 SPECIALIZED COMMUNICATING
SELECTING SUBTONE FREQUENCY
Some 10-meter FM repeaters require the transceiver to
transmit a subtone, to prevent other repeaters on the
same frequency from locking each other up. The
required subtone frequency depends on the repeater
you are accessing. In Europe, a 1750 Hz tone is
generally used to access repeaters.
Select the subtone frequency you require via Menu
No. 18. The default is 88.5 Hz. The available choices
are shown in the table below.
Note: Use Nos. 01 to 39 shown in the table above when selecting
subtone frequencies via Computer Control {page 51}.
CONTINUOUS OR BURST SUBTONES?
In addition to selecting the frequency of the subtone,
you must choose the correct subtone duration. The
Continuous selection continuously sends the subtone
as long as the transceiver is transmitting. The Burst
selection sends a 500 ms subtone burst each time the
transceiver begins transmitting.
Select either Continuous or Burst via Menu No. 19. The
default is Continuous except on some European
versions.
FM CTCSS OPERATION
CTCSS is the abbreviation for Continuous Tone Coded
Squelch System. CTCSS uses subaudible tone
frequencies. While you are transmitting, a subtone that
you select is superimposed on your transmit signal.
Suppose that only stations “A”, “B”, and “C” are
programmed with the same subtone frequency. When
“A” calls, the squelch on only “B” and “C” opens. So
you can choose which stations will receive your
transmissions.
1 Press [A/B] to select VFO A or VFO B.
•“tA” or “tB” appears to show which VFO is
selected.
2 Select the desired subtone frequency via Menu
No. 18.
3 Select the operating frequency.
4 Press [FM/AM] to select FM mode.
• “FM” appears.
5 Turn the SQL control to adjust squelch.
6 Repeatedly press [AGC/TONE] until “CTCSS”
appears.
• To quit CTCSS, press [AGC/TONE] again.
7 When you are called:
The squelch in your transceiver opens only when the
selected subtone is received.
When you make a call:
Press and hold Mic [PTT], or press [SEND].
• The selected subtone is superimposed on your
transmitted signal.
Note:
◆
When using split-frequency operation, select FM mode on both
VFOs to use CTCSS.
◆
While selecting 1750 Hz subtone, you cannot switch ON the
CTCSS.
◆
Input to the microphone is muted while transmitting a 1750 Hz
subtone.
01
02
03
04
05
06
07
08
09
10
67.0
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
11
12
13
14
15
16
17
18
19
20
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
21
22
23
24
25
26
27
28
29
30
136.5
141.3
146.2
151.4
156.7
162.2
167.9
173.8
179.9
186.2
31
32
33
34
35
36
37
38
39
192.8
203.5
210.7
218.1
225.7
233.6
241.8
250.3
1750
Freq.
(Hz)
No. No.
No.
No.
Freq.
(Hz)
Freq.
(Hz)
Freq.
(Hz)