Re: K3 APF

Posted by KK7P on Nov 01, 2010; 1:19am
URL: http://elecraft.85.s1.nabble.com/K3-APF-Adjustable-Q-tp5688670p5692622.html

The APF has a rapid 180 degree phase shift as you pass through its
center frequency.  This is fine fore CW, but would wreak havoc on a
PSK31 signal.  The K3s narrow filters (nomianl 50 Hz) are very good for
local PSK31 decoding.  In addition, most PC-based software includes
well-matched filters for PSK31 decoding.

The APF is really intended for CW operation only.

73,

Lyle KK7P

> What are the pro's and cons of implementing it for the digital modes too?

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