Icom IC-F21GM - Manual (Page 26)

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SET MODE
D D CTCSS FIND
This transceiver can detect the CTCSS tone frequency in the re-
ceived signal. By monitoring a signal that is being transmitted from
the other station, you can determine the tone frequency required to
communicate with them.
This function very useful when you are going to communicate with
unknown CTCSS channel number stations. ‘CTCSS FIND’ scans
all of the CTCSS channels, then stops when a tone frequency is
detected.
q While pushing and holding [MONI], [W/N], turn [OFF/VOL] to
power ON.
w Select the desired CH 1 to CH 15 that you want to assign the
CTCSS tone frequency.
e Push and hold [MONI] until a beep (Pi) is emitted.
• ‘ CTCSS FIND’ start to scan the signal.
r ‘CTCSS FIND’ stops when the tone signal is detected.
t Push [MONI] to determine the tone number.
y Turn the power OFF, and then ON again.