Using If Shift And Width Together - Yaesu FTDX9000MP Operation Manual

I I I I I R R R R R
NTERFERENCE NTERFERENCE NTERFERENCE EJECTION EJECTION EJECTION
NTERFERENCE NTERFERENCE EJECTION EJECTION
WIDTH ( IF DSP B
The IF Shift and Variable IF Width featuress together form a very effective interference-fighting filtering system.
For example, in Figure (A) you can see how interfer-
ence has appeared both on the high and low sides of
the desired signal. By rotating the [ WIDTH ] control,
as shown in Figure (B), the interference from one side
can be eliminated, and by re-positioning the [ SHIFT ]
control (Figure (C)), the interference on the opposite
side can be removed, without re-introducing the inter-
ference previously eliminated in Figure (B).
A A A A A
D D D D D VICE VICE VICE VICE VICE
For best interference reduction, the Width and Shift
features are the primary tools you should use. After
narrowing the bandwidth (Width) and/or adjusting the
center of the passband (Shift), the Contour control may
also yield additional signal-enhancement benefits on
the net residual bandwidth. What's more, the IF Notch
Filter (see the next section) may also be utilized, in
conjunection with the three other filter systems, to sig-
nificant advantage.
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IGN IGN ALS WITHIN KHZ KHZ
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ANDWIDTH UNING

Using IF Shift and Width Together

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Desired Signal
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PERATION ANUAL