Icom IC-2820H Instruction Manual page 145

NOTE: While receiving a signal (on a frequency other than
the weather alert ON frequency), the receiving signal or
audio will be interrupted momentarily every 5 sec.
in case the alert function is turned ON. This symptom is
caused by the WX alert function. To cancel these symp-
toms, set the weather alert item OFF in "DUP/TONE" set
mode.
(approx.)
OTHER FUNCTIONS
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