Yaesu VX-170, Operating Manual

Page: 28 / 88

VX-170 O
PERATING
M
ANUAL
26
EPCS
(
E
NHANCED
P
AGING
& C
ODE
S
QUELCH
)
The
VX-170
includes an Enhanced CTCSS tone encoder/decoder and a dedicated micropro-
cessor providing paging and selective calling features. This allows you to place a call to a
specific station (Paging), and to receive calls of your choice directed only to you (Code Squelch).
The paging and code squelch systems use two pairs of (alternately switched) CTCSS tones
which are stored in the pager memories. Basically, your receiver remains silent until it
receives the CTCSS tone pair that matches those stored in the Receiving Pager Memory.
The squelch then opens so the caller is heard, and the paging ringer immediately sounds, if
activated. When you close the
PTT switch to transmit, the CTCSS tone pair which is
stored in the Transmitting Pager Memory will be transmitted automatically.
On the paged radio, the squelch will close automatically after the incoming page ends.
Storing the CTCSS Tone Pairs for EPCS Operation
1. Press the [ F
] key, then press the [
0
(
SET
)] key to enter the Set mode.
2. Rotate the
DIAL
knob to select Set Mode Item 18:
ECS.CDR
for the Receiving CTCSS Tone Pair or Set Mode Item 19:
ECS.CDT
for the Transmitting CTCSS Tone Pair.
3. Press the [ F
] key momentarily to enable adjustment of this Set
Mode Item.
4. Rotate the DIAL knob to set the CTCSS Tone number which
corresponds to the first tone of the CTCSS Tone Pair.
5. Press the [
(
MHz
)] or [ (
MHz
)] key, then rotate the
DIAL
knob to set the CTCSS Tone number which corresponds to the
second tone of the CTCSS Tone Pair.
6. Press the
PTT
switch to save the new setting and exit to normal
operation.
The VX-170 does not recognize the order of the 1st tone
and the 2nd tone. In other words, for example, the VX-
170 considers both CTCSS pairs “10, 35” and “35, 10” to be identical.
CTCSS/DCS/EPCS O
PERATION
Hz
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
No.
01
02
03
04
05
06
07
08
09
10
Hz
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
No.
11
12
13
14
15
16
17
18
19
20
Hz
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
No.
21
22
23
24
25
26
27
28
29
30
Hz
171.3
173.8
177.3
179.9
183.5
186.2
189.9
192.8
196.6
199.5
No.
31
32
33
34
35
36
37
38
39
40
Hz
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
No.
41
42
43
44
45
46
47
48
49
50
CTCSS T
ONE
N
UMBER