Tone Squelch Operation - Yaesu FT-991 Operating Manual

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You may also use "Tone Squelch" whereby your receiver will be kept silent until an incoming signal modulated with a
matching CTCSS tone is received. The receiver squelch will then open in response to the reception of the required tone.
1. Rotate the Main tuning Dial to the output frequency
(downlink) from the repeater.
2. If CTCSS Tone operation is desired/needed, press
the F(M-LIST) button, then touch
LCD to engage the CTCSS mode.
[ TONE ] on the LCD repeatedly to choose
3. Touch
"T.SQL" from the available choices of
"OFF"  "ENC (Tone Encoder)"
 "T.SQL (Tone Squelch)"  "OFF"
4. Rotate the MULTI knob to select the desired CTCSS
Tone to be used. Fifty standard CTCSS tones are
provided (see the CTCSS Tone Chart).
5. A "d" notation on the "1 Hz" frequency digit in
the display will indicate that the Tone Decoder is
engaged. A "t" notation on the "1 Hz" frequency
digit while transmitting will indicate that the Tone
Squelch is engaged.
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o
peraTion
t S
one quelch
[ TONE ] on the
o
perAtion
MENU(SETUP) Button
MULTI Knob
FT-991 O
F(M-LIST) Button
M
peraTing anual