Ctcss/Dcs/Epcs Operation; Ctcss Operation - Yaesu FT-270R Operating Manual

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 "
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 "
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 "
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/
FT-270R O
CTCSS/DCS/EPCS O
CTCSS O
TONE
TSQL
" notation to appear. When "
" icon will blink on the display when the Reverse Tone
M
" indication appears on
TSQL
CTCSS TONE FREQUENCY ( Hz )
67.0 69.3
82.5 85.4
100.0 103.5 107.2
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
PERATION
" is
71.9 74.4 77.0
88.5 91.5 94.8
110.9 114.8
– – –
79.7
97.4
118.8
–
23