FT-270R O
PERATING
M
ANUAL
23
CTCSS/DCS/EPCS O
PERATION
CTCSS O
PERATION
Many repeater systems require that a very-low-frequency audio tone be superimposed on
your FM carrier in order to activate the repeater. This helps prevent false activation of the
repeater by radar or spurious signals from other transmitters. This tone system, called
“CTCSS” (Continuous Tone Coded Squelch System), is included in your
FT-270R
, and is
very easy to activate.
CTCSS setup involves two actions: setting the Tone Mode and then setting of
the Tone Frequency. These actions are set up by using the [1(SQ TYP)] key
and [2(CODE)] keys.
1.
Press the [
F/L
] key, then press the [
1
(
SQ TYP
)] key to enable selection of the CTCSS/
DCS/ECS mode.
2.
Rotate the
DIAL
knob so that “
TONE
” indication appears on
the display; this activates the CTCSS Encoder, for access to
repeaters requiring a CTCSS tone.
3.
Rotation of the
DIAL
knob one more “click” in step “2” above
will cause the “
TSQL
” notation to appear. When “
TSQL
” is
displayed, this means that the Tone SQueLch system is active,
which mutes your
FT-270R
’s receiver until it receives a call from
another radio sending out a matching CTCSS tone. This can
help keep your radio quiet until a specific call is received, which may be helpful while
operating in congested areas of the band.
1) You may notice a “REV TN” indication on the display while you rotate
the DIAL knob in this step; this means that the Reverse Tone Squelch
system is active, which mutes your FT-270R’s receiver (instead of opening
the squelch) when it receives a call from the radio sending a matched
CTCSS tone. The “
” icon will blink on the display when the Reverse Tone
Squelch system is activated.
2) You may notice the “DCS” and “ECS” indications on the display while you rotate
the DIAL knob still more. We’ll discuss the Digital Code Squelch system (for “DCS”)
and Enhanced Paging & Code Squelch (for “ECS”) later.
4.
When you have made your selection of the CTCSS tone mode, press the
PTT
switch
to save the new setting.
5.
Press the [
F/L
] key, then press the
[
2
(
CODE
)] key to enable adjustment of
the CTCSS fre-
quency.
6.
Rotate the
DIAL
knob until the dis-
play indicates the Tone Frequency you
need to be using (ask the repeater owner/
CTCSS TONE FREQUENCY
(
Hz
)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
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Содержание FT-270R
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