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A A A A A
I I I I I
D D D D D V V V V V ANCED
ANCED
ANCED
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NTERFERENCE
NTERFERENCE
NTERFERENCE
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NTERFERENCE
U
SING THE
The VRF system is a high-performance RF front-end preselector that provides outstanding rejection of out-of-band signals.
SUB(VFO-B) [VRF] Knob
SUB(VFO-B) [VRF] Switch
( VFO-A ) F
VRF
M
B
ON THE
AIN
AND
1. Press the [ VRF/µ ] switch momentarily. The LED in-
side the switch will become illuminated, and the VRF
system will be engaged, centered on your current
Amateur band.
2. You may rotate the [ VRF/µ ] knob to skew the posi-
tion of the VRF system relative to your operating fre-
quency. Because the VRF system is relatively broad,
although still much narrower than the fixed bandpass
filter), you may not hear much difference in the back-
ground noise or signal quality when you make minor
adjustments. However, if you have receiving problems
associated by a very strong signal, rotation of the
[ VRF/µ ] knob may help reduce the strength of the
interfering station, allowing improved reception of the
desired signal.
After moving the passband of the VRF system
manually, you may re-center it on the current Ama-
teur band by pressing and holding in the [ VRF/µ ]
switch for two seconds.
To switch VRF off, press the [ VRF/µ ] switch mo-
mentarily again. The LED imbedded in the switch
will go out, and the VRF circuit will be removed
from the incoming received signal path.
The VRF filter, utilizing high-quality coils and capacitors that provide high Q, yields a passband that is approxi-
mately 20% to 30% the width of a traditional, fixed bandpass filter. As a result, significantly more unwanted signal
rejection is provided. Within each Amateur band, 64 adjustment steps are provided (50 MHz: 8 steps), if you wish
to skew the response in a particular direction so as to enhance interference rejection even more.
Page 68
-S -S -S -S -S
F F F F F
UPPRESSION
UPPRESSION
UPPRESSION
UPPRESSION
UPPRESSION
VRF ( V
RF F
ARIABLE
U
REQUENCY
1. Press the Sub (VFO-B) [ RX ] switch to engage Dual
2. Press the Sub (VFO-B) band's [ VRF ] switch to en-
3. Rotation of the [ VRF ] knob allows adjustment of the
Q Q Q Q Q
P P P P P
UICK
UICK
OINT
OINT
UICK
UICK
UICK
OINT
OINT
OINT
: : : : : RF F
RF F
RF F
RF F
RF F
EA EA EA EA EATURES
TURES
TURES
TURES
R R R R R ONT
ONT
ONT
ONT
TURES
ONT
-
F
RONT
END
ILTER
MAIN(VFO-A) [VRF/μ] Knob
VDD
MAIN(VFO-A) [VRF/μ] Switch
VRF
S
B
SING
ON THE
UB
AND
Receive operation.
gage the VRF. The LED imbedded in the switch will
light up, confirming that VRF is now in the signal path
for the Sub (VFO-B) receiver.
The settings of the VRF are set and held in memory
independently for each Amateur band, so any cus-
tom settings will be maintained despite any band
changes you perform.
center frequency of the VRF circuit.
If you have made adjustments to the VRF circuit's
center frequency, press and hold in the [ VRF ]
switch for two seconds to re-center the VRF on
the center of the Amateur band on which you cur-
rently are operating.
To switch VRF off, press the [ VRF ] switch mo-
mentarily again. The LED imbedded in the switch
will go out, and the VRF circuit will be removed
from the Sub (VFO-B) receiver's incoming signal
path.
FT
9000MP O
DX
E E E E E
ND ND ND ND ND
)
BIAS
TEMP
SWR
( VFO-B ) F
REQUENCY
M
PERATION
ANUAL
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