Bedienungsanleitung Yaesu FT-DX9000 (Seite 26 von 156) (Englisch)

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Page 24 FT DX 9000D OPERATION MANUAL

NB Switch

Pressing this button activates the (analog) IF Noise

Blanker, which may help reduce many different types

of man-made impulse noise (but not atmospherics).

When the Noise Blanker is activated, the LED inside

the button will glow red. Adjustment of the Noise

Blanker level is accomplished via the NB knob, de-

scribed in the previous section.

VRF/µ-T Switch

This button turns the main band (VFO-A) receiver’s

VRF filter or µ-TUNE filter on and off. While acti-

vated, the LED inside the button will glow red.

VRF/µ-T/NTCH Knobs

VRF/µ-T Knob

The inner VRF/µ-T knob tunes the passband of the

main band (VFO-A) receiver’s RF filter (18 MHz and

higher Amateur bands) or µ-TUNE filter (Narrow-

bandwidth High-Q RF Filter) (14 MHz and lower

Amateur bands) for maximum receiver sensitivity (and

out-of-band interference rejection). On the 18 MHz

and higher Amateur bands, this knob provides adjust-

ment of the VRF (Variable RF Filter) preselector cir-

cuit.

Advice

H It is possible to use the Menu to de-select the µ-

Tune module, and utilize VRF instead, on bands

where a µ-Tune module is installed. However, the

superior selectivity of the µ-Tune circuit is pre-

ferred for most applications.

H The µ-Tune circuitry automatically tracks your op-

erating frequency, and adjustment of its center fre-

quency is normally not required. However, if a

very strong signal within several dizen kHz is

causing you problems, you may use the VRF/µ-

T / NTCH knob to skew the tuning to one side

of the other of your current frequency, to roll off

the strength of the interfering station.

H If you wish to reset the tuning of the VRF/µ-T /

NTCH knob to its original (centered) setting,

just press and hold in the VRF/µ-T switch (#

above) for two seconds. The µ-Tune circuit will

not revert to its normal (automatically tuned) po-

sition, centered on your current frequency.

H There is a slight increase in receiver path insertion

loss when the µ-Tune circuit is engaged. On the

frequencies where µ-Tune is used, this is seldom a

problem. If the slight signal loss presents a prob-

lem, just turn the VRF/µ-T switch (# above)

Off.

H Rotation of the VRF/µ-T / NTCH knob to

adjust the µ-Tune circuit should be performed only

to optimize the signal or reduce interference. The

µ-Tune circuit tuning is surprisingly sharp. If you

are adjusting VRF, however, the tuning is much

more broad, and we believe that VRF adjustment

will seldom be required.

H The relative position of the µ-Tune or VRF pass-

band can be observed on the TFT display.

NTCH Knob

The outer NTCH knob adjusts the center frequency

of the main band (VFO-A) IF notch filter. The Notch

Filter is engaged via the NTCH switch, described

in the next section.

FRONT PANEL CONTROLS

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