Bedienungsanleitung Yaesu FT-DX9000 (Seite 27 von 156) (Englisch)

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Page 25FT DX 9000D OPERATION MANUAL

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.

Advice

H The width of the notch may be set to either “Wide”

or “Narrow” via Menu item “RX DSP 082 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.

H 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.

Advice

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 Reduc-

tion level is provided by the DNR knob, described

in the next section.

CONT DNR Knob

CONT Knob

The inner

CONT knob selects the desired sub band

(VFO-B) CONTOUR filter response. The CONTOUR

filter is engaged via the

CONT switch, described in

the next section.

DNR Knob

The outer DNR knob selects the optimum Main

Band (VFO-A) Digital Noise Reduction response. The

Noise Reduction circuit is engaged via the DNR

switch, described in section above.

CONT Button

This button turns the sub band (VFO-B) CONTOUR

filter on and off. When the CONTOUR filter is acti-

vated, the LED inside the button will glow umber. Ad-

justment of the CONTOUR filter’s center frequency

is provided by the CONT knob, described in sec-

tion above.

Quick Note

There are times, when you’re trying to remove inter-

ference with a sharp DSP filter, that the remaining sig-

nal 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.

Advice

H The action of the CONTOUR filter (either null-

ing or peaking of frequency components as you

adjust the center frequency) may be adjusted via

Menu item “RX DSP 079 MAIN-CONTOUR-

WIDTH.” The adjustment range includes settings

of -15 dB (nulling) to +10 dB (peaking).

H 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 above), as you

can observe the position of the null or peak in the

audio passband.

FRONT PANEL CONTROLS

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