Page 55FTDX5000 OPERATING MANUAL
ADVICE:
The VRF system tuning is relatively broad, although it
is still much narrower than the fixed bandpass filter.
You may not hear much difference in the background
noise or signal quality when you make minor adjust-
ments. However, if you have receiving problems asso-
ciated with a very strong signal, rotation of the
[
SE-
LECT
]
knob may help reduce the strength of the inter-
fering station, allowing improved reception of the de-
sired signal, if receiver overload was degrading recep-
tion.
The VRF Filter operational status will be memorized
independently on each VFO in the VFO stack.
You may select the display pattern shown in the SUB
DISPLAY window from three patterns via Menu item
“019 DISP SELECT”. See page 122 for details.
QUICK POINT:
The VRF filter utilizes high-quality coils and capacitors
that provide high Q, and yield 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,
the following adjustment steps are provided, if you wish
to skew the response in a particular direction to enhance
interference rejection even more. The actual “sound” of
the signal you are listening to will remain unchanged, how-
ever.
AMATEUR BAND
1.8 MHz
3.5 MHz
5 MHz
7 MHz
10 MHz
14 MHz
18 MHz
21 MHz
24.5 MHz
28 MHz
VRF ADJUSTMENT STEPS
62 steps
62 steps
62 steps
62 steps
30 steps
30 steps
20 steps
20 steps
20 steps
20 steps
A
DVANCED
I
NTERFERENCE
-S
UPPRESSION
F
EATURES
:
RF F
RONT
E
ND
USING THE VRF
(
VARIABLE RF FRONT-END FILTER
)
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