[Elecraft] APF vs ordinary filters?

[Guy Olinger K2AV]

The passband shape is that of an inverted "V" with a sharp tip.  While
this can be remarkably useless for tuning around, the regular passband
shapes being better for that, once a real weakie is discovered, tuning
the APF to it creates an immediate signal to noise improvement.  It is
so narrow though that one can tune past a weak signal and not hear it.

On Sat, Nov 6, 2010 at 11:51 AM, Robert Morris <rtm at lcs.mit.edu> wrote:
> Why is it that the APF is more effective than a narrow ordinary
> DSP filter?
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