Icom IC-7700

4-6
D APF (Audio Peak Filter) operation
The APF changes the audio frequency response by
boosting a particular frequency to enhance a desired
CW signal.
The peak frequency can be adjusted with [DIGI-SEL]
controlwhen“APF”isselectedfor“DIGI-SELVROp-
eration” in Others set mode (p. 12-15).
The APF audio level can be adjusted in the Level set
mode (p. 12-6).
The audio filter shape is also selectable from “SOFT”
and “SHARP” in Others set mode (p. 12-16).
q During CW mode, push
APF/TPF
to turn the
audio peak filter ON or OFF.
 •“
APF
” appears in the display and [APF/TPF] indicator
above this switch lights green.
w Hold down
APF/TPF
for 1 second several times
to select the desired audio filter width.
 •WIDE,MIDandNARfilters,or,320,160and80Hz
filters are available depending on APF type setting in
Other set mode. (p. 12-16)
eIf“APF”isselectedfor“DIGI-SELVROperation,”
rotate [DIGI-SEL] control to suit your preference.
[DIGI-SEL]
APF/TPF
4
RECEIVE AND TRANSMIT