CTCSS/DCS/EPCS Operation
CTCSS Operation
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-2980R/E
, 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 Set (Menu)
mode, selections #49 (SQL.TYP) and #52 (TN FRQ).
1. Press and hold in the [
MHz
(
SET
)] key for one second,
then rotate the
DIAL
knob to select “
49 SQL.TYP
”.
2. Press the [
MHz
(
SET
)] key, then rotate the
DIAL
knob
so that “
TONE
” appears on the display; this activates the
CTCSS Encoder, which allows repeater access.
3. Rotating the
DIAL
knob one more click clockwise in the
above step will cause “
TSQL
” to appear. When “
TSQL
”
appears, this means that the Tone Squelch system is active, which mutes your
FT-
2980R/E
’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.
1) You may notice a “
RV 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-2980R/E’s receiver (instead of opening the
squelch) when it receives a call from the radio sending a matched CTCSS tone.
The “
T SQ
” icon will blink on the display when the Reverse Tone Squelch sys-
tem is activated.
2) You may notice a “
DCS
” indication on the display while you rotate the DIAL
knob still more. We’ll discuss the Digital Code
Squelch system shortly.
4. When you have made your selection of the CTCSS tone
mode, press the [
MHz
(
SET
)] key momentarily, then
rotate the
DIAL
knob three clicks clockwise to select Menu “
52 TN FRQ
”. This Menu
selection allows setting of the CTCSS tone frequency to be used.
5. Press the [
MHz
(
SET
)] key to enable adjustment of the CTCSS frequency.
6. Rotate the
DIAL
knob until the display indicates the
Tone Frequency you need to be using.
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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FT-2980R/E Operating Manual
