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NOTCH, CONT/APF
Inner Knob (NOTCH)
Rotate the inner [NOTCH] knob to adjust the cen-
ter frequency of the IF NOTCH filter. Press the
[NOTCH] key to turn the IF NOTCH filter ON or
OFF.
The null position of the IF NOTCH lter can be ob-
served on the display.
Additionally, the display will show the center fre-
quency of the IF NOTCH lter for 0.5 second when-
ever the [NOTCH] knob is turned.
Press and hold to reset NOTCH, CONTOUR, APF.
Outer Knob (CONT/APF)
The DSP CONTOUR operation can alter the prole
of the passband to partially attenuate an in-band
frequency component.
The CONTOUR operation can be switched ON/
OFF with the [CONT] Key.
The inuence of CONTOUR is depicted graphically
on the display.
If there is interference or noise during CW opera-
tion, the APF center frequency is automatically set
to the CW PITCH frequency as a “peak filter”, to
make it easier to hear the desired signal.
APF operation is switched ON / OFF with the [APF]
key.
The location of the APF peak frequency is graphi-
cally illustrated on the display.
When the knob is turned, the center fre-
quency of NOTCH, the center frequency
of CONTOUR, or the Peak Frequency shift
width of the of the APF will be illustrated on
the display for 0.5 seconds.
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