Kenwood TH-D72A - Manual (Page 24)

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Squelch is used to mute the speaker when no signals are present. With the
squelch level set correctly, you will hear sound only while actually receiving a
signal. The higher the squelch level selected, the stronger the signals must be in
order to hear them. You can set the squelch level separately for Band A and B.
1 Press [F], [MONI].
• The squelch level appears on the display.
2 Press [ ]/[ ] or rotate the Tuning control of your selected band, when no
signals are present, and select the squelch level at which the background
noise is just eliminated.
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Press [A/B] to select operating band A or B.