A "noise blanker" is actually a signal blanker triggered by noise. The
noise that is used to trigger the blanking can come from the same IF
that the desired signal passes through, usually before the narrow
filtering in that IF. In some cases the noise pulses that trigger the
blanking come from a separate receiver, or a separate IF system in the
same receiver. In all cases (that I know of) the blanking cuts segments
of the desired signal out (when the noise peaks occur) and is
necessarily a distortion of the desired signal.
DE N6KB
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