12
Using the Squelch Feature
FT-25R/FT-25E Advance Manual
EPCS (Enhanced Paging & Code Squelch)
The
FT-25R/E
includes an Enhanced CTCSS tone encoder/decoder and a dedicated
microprocessor providing paging and selective calling features. The squelch permits
directing calls to specific stations (Paging), and receiving only the calls directed to stations
programmed with a similar code (Code Squelch).
The paging and code squelch systems use two pairs of (alternately switched) CTCSS
tones which are stored in the pager memories. Basically, the receiver remains silent until
it receives the CTCSS tone pair that matches those stored in the Receiver Pager Memory.
The squelch then opens so the caller is heard, and the paging ringer (if activated)
immediately sounds. When the
PTT
switch is pressed to transmit, the CTCSS tone pair
which is stored in the Transmitting Pager Memory will be transmitted automatically.
On the paged transceiver, the squelch will close automatically after the incoming page
ends. Meanwhile, on the paging transceiver, the Enhanced Paging and Code Squelch
system will be disabled after the
PTT
switch is released, after the paging transmission.
The Enhanced Paging and Code Squelch system may be re-activated again using Set
Mode Item “
21 PAGER
”, if desired.
Storing the CTCSS Tone Pairs for EPCS Operation
1. Press and hold the
F
key to enter the Set Mode.
2.
Press the [▲] or [▼] key to select Set Mode Item “
21 PAGER
”
3. Press the
F
key to enable adjustment of this item.
4. Press the
F
key.
The first TX tone number will blink.
5. Press the numeric keys to input the CTCSS Tone number which corresponds to the
first tone of the CTCSS Tone Pair.
The tone numbers are listed below.
CTCSS TONE NUMBER
No.
Hz
No.
Hz
No.
Hz
No.
Hz
No.
Hz
01
67.0
11
94.8
21
131.8
31
171.3
41
203.5
02
69.3
12
97.4
22
136.5
32
173.8
42
206.5
03
71.9
13
100.0
23
141.3
33
177.3
43
210.7
04
74.4
14
103.5
24
146.2
34
179.9
44
218.1
05
77.0
15
107.2
25
151.4
35
183.5
45
225.7
06
79.7
16
110.9
26
156.7
36
186.2
46
229.1
07
82.5
17
114.8
27
159.8
37
189.9
47
233.6
08
85.4
18
118.8
28
162.2
38
192.8
48
241.8
09
88.5
19
123.0
29
165.5
39
196.6
49
250.3
10
91.5
20
127.3
30
167.9
40
199.5
50
254.1
6. Press the
F
key to input the second TX tone.
The second TX tone number will blink.
