D APF (Audio Peak Filter) operation
The APF changes the audio frequency response by
boosting a particular frequency to enhance a desired
CW signal.
q During the CW mode, push [APF/TPF] to turn the
audio peak filter ON or OFF.
• “ ” appears in the display and the indicator on this
switch lights green when the audio peak filter is ON.
w Hold down [APF/TPF] for 1 second several times
to select the desired audio filter width.
• WIDE, MID and NAR lters, or 320, 160 and 80 Hz
filters are selectable, depending on [APF type] item
setting in the Others set mode. (p. 141)
The APF (Audio Peak Filter) type is also selectable
from “SOFT” and “SHARP” in [APF type] item in the
Others set mode (p. 141).
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