4-10
4
RECEIVE MODES
D
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 audio filter shape is also selectable from “SOFT”
and “SHARP” in the others set mode. (p. 11-13)
q
During CW mode, push [APF/TPF] to turn the audio
peak filter ON and OFF.
• “
” appears in the display and [APF/TPF] indicator
above this switch lights green.
w
Push and hold [APF/TPF] for 1 sec. several times
to select the desired audio filter width.
• 320, 160 and 80 Hz filters are available.
D
D
About CW reverse mode
CW-R (CW Reverse) mode uses the opposite side
band to receive CW signals.
Use when interfering signals are near a desired signal
and you want to use CW-R to reduce the interference.
➥
During CW mode, push and hold [SSB/CW] for 1
sec. to select CW and CW-R mode.
D
D
About CW pitch control
The received CW audio pitch can be adjusted to suit
your preference (from 300 to 900 Hz in 5 Hz steps).
This does not change the operating frequency.
q
During CW mode, push [PITCH] to turn the CW
pitch setting screen ON and OFF.
w
Rotate the main dial to suit your preference.
• Adjustable within 300 to 900 Hz in 5 Hz steps.
• Push and hold [F-4•DEF] for 1 sec. to return to the de-
fault setting.
[PITCH]
[F-4•DEF]
Main dial
Push
BFO
CW-R mode (USB side)
BFO
Desired signal
CW mode (LSB side)
Interference
Desired signal
Interference
APF
[APF/TPF]
Sets the desired CW pitch within 300 to 900 Hz in
5 Hz steps. (default: 800 Hz)
CW Pitch
800
