Page 152
FT
DX
9000 C
ONTEST
O
PERATION
M
ANUAL
D
UAL
R
ECEIVE
U
NIT
(
RXU-9000
)
IF N
OISE
B
LANKE
(
NB
)
O
PERATION
If the optional Dual Receive Unit (
RXU-9000
) is installed, IF Noise Blanker operation is available on both the VFO-A and
VFO-B. Operation is identical on either VFO.
As a reminder, there is no difference in the fundamental performance of the two VFOs. Please see page 62 for details.
VFO-A Band NB Operation
1. Press the VFO-A NB switch (#
) momentarily to
reduce a short pulse noise such as from switching tran-
sients, automobile ignitions and power lines. The LED
imbedded in the switch will glow Red to confirm that
the Narrow-NB is operating.
Press and hold the VFO-A NB switch (#
) for
two seconds to reduce a longer duration man-made
pulse noise. The LED imbedded in the switch will glow
Yellow to confirm that the Wide-NB is operating.
2. Advance the VFO-A NB control (#
) to the point
where the offending ignition noise is best reduced or
eliminated.
To end Noise Blanker operation, press the VFO-A NB
switch (#
) once more. The LED imbedded in the switch
will turn off, confirming that the Noise Blanker is no longer
in operation.
VFO-B Band NB Operation
1. Pressing the SUB RX switch (#
) will engage
Dual Receive operation.
When the imbedded LED glows green, this is your
confirmation that Dual Receive is in operation.
2. Press the VFO-B NB switch (#
) momentarily to
reduce a short pulse noise such as from switching tran-
sients, automobile ignitions and power lines. The LED
imbedded in the switch will glow Umber to confirm
that the Narrow-NB is operating.
Press and hold the VFO-B NB switch (#
) for
two seconds to reduce a longer duration man-made
pulse noise. The LED imbedded in the switch will glow
Yellow to confirm that the Wide-NB is operating.
3. Advance the VFO-B NB control (#
) to the point
where the offending ignition noise is best reduced or
eliminated.
To end Noise Blanker operation, press the VFO-B NB
(#
) switch once more. The LED imbedded in the switch
will turn off, confirming that the Noise Blanker is no longer
in operation.
Advice
When the Roofing filter mode is set to “AUTO” and the
Noise Blanker is turned On, the Roofing Filter bandwidth
will automatically be set to 15 kHz. However, you still
may override the automatic setting, and select a more nar-
row Roofing Filter.
NB Switch
NB Switch
NB Knob
NB Knob
VFO-B
VFO-A
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