Dcs Operation; Tone Squelch Operation - Yaesu FT-991A Operating Manual

FM Mode Operation
The "Tone Squelch" may be activated to keep the receiver 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. Press the MODE button, and then touch the corre-
sponding key on the LCD to select the FM operating
mode. The "FM" icon appears in the display.
2. Set the transceiver to the desired frequency.
3. If CTCSS Tone operation is desired/needed, press
F ( M-LIST )
the button, then touch
the LCD to engage the CTCSS mode.
[ TONE/DCS ] on the LCD repeatedly to
4. Touch
choose "CTCSS" from the available choices of
"OFF"  "ENC ( Tone Encoder ) "
 "CTCSS ( Tone Squelch ) "
 "DCS ( Digital Code Squelch ) "  "OFF"
The "DCS" may be activated to keep the receiver silent until an incoming signal modulated with a matching DCS code
is received. The receiver squelch will then open in response to the reception of the required code.
1. Press the MODE button, and then touch the corre-
sponding key on the LCD to select the FM operating
mode. The "FM" icon appears in the display.
2. Set the transceiver to the desired frequency.
3. If DCS operation is desired/needed, press
LIST )
button, then touch
to engage the DCS mode.
[ TONE/DCS ] on the LCD repeatedly to
4. Touch
choose "DCS" from the available choices of
"OFF"  "ENC ( Tone Encoder ) " 
 "CTCSS ( Tone Squelch ) " 
 "EDCS ( DCS Encoder ) " 
 "DCS ( Digital Code Squelch ) "  "OFF"
Page 96

Tone Squelch Operation

[ TONE/DCS ] on

DCS Operation

F ( M-
the
[ TONE/DCS ] on the LCD
5. Touch [ FWD ] to switch the screen, and then touch
[ TONE ] . Rotate the MULTI knob to select the de-
sired CTCSS Tone to be used. A total of 50 standard
CTCSS tones are provided ( see the CTCSS Tone
Chart ) .
CTCSS Tone Frequency ( Hz )
67.0 69.3 71.9 74.4
88.5 91.5 94.8 97.4 100.0
114.8 118.8 123.0 127.3 131.8
151.4 156.7 159.8 162.2 165.5
177.3 179.9 183.5 186.2 189.9
203.5 206.5 210.7 218.1 225.7
250.3 254.1
- -
5. Touch [ FWD ] to switch the screen, and then touch
[ DCS ] . Rotate the MULTI knob to select the desired
DCS code to be used. A total of 104 DCS codes are
provided ( see the DCS Code Chart ) .
DCS CODE
023 025 026 031
051 053 054 065
114 115 116 122
143 145 152 155
174 205 212 223
245 246 251 252
266 271 274 306
332 343 346 351
411 412 413 423
452 454 455 462
506 516 523 526
612 624 627 631
703 712 723 731
FT- 991 Operating Manual
77.0 79.7 82.5 85.4
103.5 107.2 110.9
136.5 141.3 146.2
167.9 171.3 173.8
192.8 196.6 199.5
229.1 233.6 241.8
- - - -
032 036 043 047
071 072 073 074
125 131 132 134
156 162 165 172
225 226 243 244
255 261 263 265
311 315 325 331
356 364 365 371
431 432 445 446
464 465 466 503
532 546 565 606
632 654 662 664
732 734 743 754