Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual page 27

NTCH Switch
This button turns the Main band (VFO-A) IF notch
filter on and off. When the IF notch filter is activated,
the LED inside the button will glow red. The Notch
Filter center frequency is adjusted via the [ NTCH ]
knob, described in the previous section.
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The width of the notch may be set to either "Wide"
or "Narrow" via Menu item "RX DSP 092 IF-
NOTCH-WIDTH" in the RX DSP Menu Group.
Setting this selection to "Narrow" will provide a
very sharp notch, with minimal disturbance to the
incoming signal wave-form.
The tuning rate of the Notch Filter being rather
slow, it frequently is useful to use the Audio Scope
of the TFT (either the Audio Spectrum Scope or
the Waterfall display) to adjust the center fre-
quency of the IF Notch Filter. In the Waterfall
display mode, the notched area will appear more
white than the background screen, while on the
Audio Spectrum Scope screen the notched area
will appear as a "hole" in the noise.
DNF Switch
This button turns the Main band (VFO-A) Digital
Notch Filter on and off. When the Digital Notch Fil-
ter is activated, the LED indicator will glow red. This
is an automatic circuit, and there is no adjustment knob
for the DNF.
R.FLT Switch
This button selects the bandwidth for the Main band
(VFO-A) receiver's first IF Roofing Filter. Available
selections are 3 kHz, 6 kHz, 15 kHz, or Auto, and the
LED indicator will change according to the bandwidth
selected.
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Because the roofing filter is in the first IF, the protec-
tion it provides against interference is quite signifi-
cant. When set to AUTO, the SSB bandwidth is 6 kHz,
while CW is 3 kHz and FM/RTTY are 15 kHz. On a
crowded SSB band, however, you may wish to select
the 3 kHz filter, for the maximum possible interfer-
ence rejection.
DNR Switch
This button turns the Main band (VFO-A) Digital
Noise Reduction circuit on and off. When the Digital
Noise Reduction is activated, the LED inside the but-
ton will glow umber. Adjustment of the Noise Re-
duction level is provided by the [ DNR ] knob, de-
scribed in the next section.
CONT DNR Knob
CONT Knob
The inner [ CONT ] knob selects the desired Main Band
(VFO-A) CONTOUR filter response. The CON-
TOUR filter is engaged via the [ CONT ] switch, de-
scribed in the next section.
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The Sub band (VFO-B) frequency display will show
the CONTOUR frequency for 3 seconds whenever
the inner [ CONT ] knob is turned.
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You may disable this feature (displaying the CON-
TOUR frequency) via Menu item "DISPLAY 022
LEVEL INDICATOR." See page 146 for details.
DNR Knob
The outer [ DNR ] knob is used to select one of the 15
available noise reduction parameters for the Main
band (VFO-A) receiver Digital Noise Reduction sys-
tem. The Noise Reduction circuit is engaged via the
[ DNR ] switch, described in section
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The Sub band (VFO-B) frequency display will show
the current noise reduction parameter for 3 seconds
whenever the outer [ DNR ] knob is turned.
You may disable this feature (displaying the current
noise reduction parameter) via Menu item "DISPLAY
022 LEVEL INDICATOR." See page 146 for details.
CONT Button
This button turns the Main band (VFO-A) CONTOUR
filter on and off. When the CONTOUR filter is acti-
vated, the LED inside the button will glow umber.
Adjustment of the CONTOUR filter's center fre-
quency is provided by the [ CONT ] knob, described
in section above.
Furthermore, in the CW mode, press and hold this
button for 2 seconds to activate the APF (Audio Peak
Filter) which provides a very narrow audio bandwidth;
the LED inside the button will glow umber for four
seconds every one second. The APF circuit is an au-
tomatic circuit, and there is no adjustment knob for
the APF.
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You may change the blinking pattern of the CONT
LED (glow umber for four seconds every one sec-
ond) when the APF feature is activated via Menu item
"DISPLAY 023 APF INDICATOR." See page 146
for details.
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There are times, when you're trying to remove inter-
ference with a sharp DSP filter, that the remaining
signal has a somewhat unnatural sound. This is caused
by the cutting of some frequency components, leav-
ing other components in excess. The CONTOUR fil-
ter allows you (especially) to roll off certain frequency
components inside the remaining passband, but in a
smooth manner that helps restore a natural sound and/
or raise intelligibility.
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The FT 9000D can not operate the CONTOUR
DX
filter and the APF at the same time.
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The action of the CONTOUR filter may be ad-
justed via Menu item "RX DSP 086 MAIN-
CONTOUR-LEVEL" and "RX DSP 087
MAIN-CONTOUR-WIDTH."
The Audio Spectrum Scope (including the Wa-
terfall displays) on the Oscilloscope page of the
TFT can be particularly useful when adjusting
the [ CONT ] control (see section
you can observe the position of the null or peak
in the audio passband.
C
ONTROLS
above.
above), as
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