Posted by
KK7P on
Sep 30, 2011; 1:12pm
URL: http://elecraft.85.s1.nabble.com/Best-way-to-use-NB-and-NR-tp6844498p6847755.html
This is true of the hardware blanker in the K3.
The DSP blanker works on a different principle, in part
because the noise pulse has potentially been "stretched"
by the selectivity of the roofing filter.
In the DSP blanker, for the duration of the noise pulse, a
locally generated signal is substituted. The amplitude is
computed from the signal prior to the noise pulse, and the
phase is extracted from the incoming signal+pulse.
This is why it pays to play with BOTH noise blanker
parameters with the K3. Depending on the type of impulse
noise (ignition, power line arcing, electric fence, etc.),
one may be much more effective than the other, or certain
qualities of each may be usefully employed to minimize
communications disruption.
73,
Lyle KK7P
> The K3 noise blanker, and in fact any noise blanker
>works by producing "holes" in the receive path...
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