Yaesu FTdx5000 Series Operating Manual page 42

A I
DVANCED NTERFERENCE
U
SING THE
A : : : : :
DVICE
ˆ Because the VRF system is relatively broad, although
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 adjustments.
However, if you have receiving problems associated
by a very strong signal, rotation of the [ SELECT ] knob
may help reduce the strength of the interfering station,
allowing improved reception of the desired signal if
overload was degrading reception.
ˆ The VRF Filter operational status will be memorized
independently on each VFO in the VFO stack.
FT 5000 O
DX
PERATING
-S
UPPRESSION
VRF ( V
ARIABLE
M
ANUAL
F
EATURES RF F
RF F - F
RONT END
Q P :
UICK OINT
The VRF filter, utilizing high-quality coils and capacitors
that provide high Q, yields a passband that is approximately
20% to 30% the width of a traditional, fixed bandpass fil-
ter. As a result, significantly more "unwanted" signal re-
jection is provided. Within each amateur band, the fol-
lowing adjustment steps are provided, if you wish to skew
the response in a particular direction so as to enhance in-
terference rejection even more. The actual "sound" of the
signal you are listening to will remain unchanged, how-
ever.
A B
MATEUR AND
1.8 MHz
3.5 MHz
5 MHz
7 MHz
10 MHz
14 MHz
18 MHz
21 MHz
24.5 MHz
28 MHz
E
RONT ND
)
ILTER
VRF A S
DJUSTMENT TEPS
62 steps
62 steps
62 steps
62 steps
30 steps
30 steps
20 steps
20 steps
20 steps
20 steps
Page 55