Using If Shift And Width Together - Yaesu FTdx5000 Series Operating Manual

I
U IF S
SING
The IF Shift and Variable IF Width features, together, form a very effective interference-fighting filter system.
For example, in Figure "A" you can see how interference
has appeared both on the high and low sides of the desired
signal. By pressing the [ WIDTH ] button (the button will
glow red) and then rotating the [ SELECT ]( width ) knob,
as shown in Figure "B", the interference from one side
can be eliminated, then press the [ SHIFT ] button to change
the function of the [ SELECT ] knob to the SHIFT knob
(the [ SHIFT ] button glows red. However, the IF Width
adjustment is not changed). Now, by re-positioning the
[ SELECT ]( shift ) knob (Figure "C"), the interference on
the opposite side can be removed, without re-introducing
the interference previously eliminated in Figure "B".
A :
The Width and Shift features are the primary tools you
should use for best interference reduction. After narrow-
ing the bandwidth (width) and/or adjusting the center of
the passband (shift), the Contour control may also yield
further signal-enhancement benefits on the net residual
bandwidth. Additionally, the IF Notch Filter (see the next
section) may be utilized, in conjunction with the three other
filter systems, to significant advantage.
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R
W T
HIFT AND IDTH
S 3
OGETHER SSB/CW/RTTY/PKT/AM M
A
Desired Signal
QRM
QRM
IF
BANDWIDTH
FT
DX
B C
Desired Signal
QRM
QRM QRM
IF
BANDWIDTH BANDWIDTH
5000 O M
Desired Signal
QRM
IF