Apf (Audio Peak Filter) Operation - Icom IC-7851 Instruction Manual

5
RECEIVE AND TRANSMIT
■
Operating CW (Continued)
D About the CW pitch control
The received CW audio pitch and CW side tone can be
adjusted to suit your preference. This does not change
the operating frequency.
q
Rotate [CW PITCH] to suit your preference.
• Adjustable between 300 to 900 Hz in 5 Hz steps.
w
Hold down [FILTER] for 1 second.
• The Filter screen is displayed.
• The Filter screen graphically displays the CW pitch.
(Shown to the right.)
Digital IF filter
Below 500 Hz
Passband
width
Above 600 Hz
e
Push [EXIT/SET].
• Exits the Set screen.
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
In the CW mode, push [APF/TPF] to turn the audio
peak filter ON or OFF.
• "APF" is displayed and the [APF/TPF] indicator
above this key lights white.
w
Hold down [APF/TPF] for 1 second.
• Hold down [APF/TPF] for 1 second selects the Audio
filter width.
APF type*
SOFT
SHARP
* The audio filter shape is also selectable between
"SOFT" and "SHARP" in the "APF TYPE" item of the
Others set screen. (p. 15-14)
(SET [F-7] > OTHERS [F-5] > APF TYPE)
e
Rotate the [DIGI-SEL] control to suit your prefer-
ence.
• The peak frequency can be adjusted with the [DIGI-SEL]
control when "APF" is selected in the "DIGI-SEL VR Op-
eration" item of the Others set screen
(SET [F-7] > OTHERS [F-5] > DIGI-SEL VR Operation)
The APF audio level can be adjusted in the Level set
screen (p. 15-5).
(SET [F-7] > LEVEL [F-1] > APF AF LEVEL)
Filter screen
The CW pitch frequency is
changed in 5 Hz steps.
BPF
• "
" is displayed.
The CW pitch frequency is
changed in 25 Hz steps.
BPF
• "
" disappears.
Filter width
WIDE, MID, NAR
320 Hz, 160 Hz, 80 Hz
(p. 15-15).
• Filter screen
CW PITCH display (Example: 700 Hz)
5-6
[CW PITCH]
APF/TPF indicator MAIN, SUB
[APF/TPF] MAIN, SUB
[DIGI-SEL] MAIN, SUB