Ctcss/Dcs Operation; Ctcss Operation - Yaesu FT-8900R 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-8900R, 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 mode #40 ( TONE M )
and #39 ( TONE F ) .
1. Press the [ SET ] key momentarily to enter the Set mode.
2. Rotate the "Main" band DIAL knob to select Menu #40 (TONE M).
3. Press the "Main" band DIAL knob momentarily, then rotate the "Main" band DIAL knob
so that "ENC" appears on the display; this activates the CTCSS Encoder, which allows
repeater access.
You may notice an additional "DCS" icon appearing while you rotate the
"Main" band DIAL knob in this step. We'll discuss the Digital Code Squelch
system shortly.
4. Rotating the "Main" band DIAL knob one more click clockwise in step "3" above will
cause "ENC.DEC" to appear. When "ENC.DEC" appears, this means that the Tone Squelch
system is active, which mutes your FT-8900R'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.
5. When you have made your selection of the
CTCSS tone mode, press the "Main" band
DIAL knob momentarily, then rotate the
"Main" band DIAL knob one click counter-
clockwise to select Menu #39 (TONE F).
This Menu selection allows setting of the
CTCSS tone frequency to be used.
6. Press "Main" band DIAL knob momentarily
to enable adjustment of the CTCSS fre-
quency.
7. Rotate the "Main" band DIAL knob until the display indicates the Tone Frequency you
need to be using.
8. When you have made your selection, press and hold in the "Main" band DIAL knob for
1/2 second to save the new setting and exit to normal operation.
FT-8900R Operating Manual
CTCSS/DCS O
CTCSS O
PERATION
CTCSS TONE FREQUENCY ( Hz )
67.0 69.3 71.9
82.5 85.4 88.5
100.0 103.5 107.2
123.0 127.3 131.8
151.4 156.7 159.8
171.3 173.8 177.3
189.9 192.8 196.6
210.7 218.1 225.7
250.3 254.1 –
PERATION
74.4 77.0 79.7
91.5 94.8 97.4
110.9 114.8 118.8
136.5 141.3 146.2
162.2 165.5 167.9
179.9 183.5 186.2
199.5 203.5 206.5
229.1 233.6 241.8
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