Tone Squelch Operation - Yaesu FT-23R MKII Operating Manual

Operation
The FT-23R
can be used to silently monitor for calls on busy channels when the
MK ‡U
optional FTS-12 Tone Squelch Unit is installed. A general description and installation
instructions are on Page 22.
To check and optionally set the tone frequency, press [ F ] + [ T SET ] . The tone frequency
will be displayed (in Hz), with a leading zero if that tone selection is a high-Q type. To
change the selected tone frequency, rotate the DIAL selector or press [ p ] or [ q ] until the
display shows the tone frequency you require (the display will step through the standard
EIA tones, listed in the table below). Press [ T ] to return to the operating frequency display
when the tone frequency is selected.
To activate the tone squelch functions press the [ T ] key. With one press, "ENC" (encode)
will be displayed and the tone generator will be activated for transmission. Press [ T ] again
and both "ENC " and "DEC" (decode) will be displayed together as the tone squelch
system is activated for both transmission and reception (only signals sending the matching
tone frequency will open the squelch). Pressing [ T ] once more disables tone squelch fea-
tures.
Once you have the tone squelch set up the way you want it, you can store it in memory (or
the call channel) by pressing [ F ] + [ M ] , select the memory to store, and [ M ] again. After-
wards, to change a setting stored in memory, just recall the memory, reset the tone fre-
quency or function, and press [ F ] + [ M ] and then [ M ] alone.
18
T S
ONE QUELCH
FTS-12 Tone Frequencies (Hz)
67.0 100.0
71.9 103.5
74.4 107.2
77.0 110.9
79.7 114.8
82.5 118.8
85.4 123.0
88.5 127.3
91.5 131.8
94.8 136.5
O
PERATION
141.3 203.5
146.2 210.7
151.4 218.1
156.7 225.7
162.2 233.6
167.9 241.8
173.8 250.3
179.9
186.2
192.8
FT-23R O
MKII
M
PERATING ANUAL