Re: APF For K3

Posted by P.B. Christensen on Oct 24, 2010; 6:47pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5668364.html

> I found the APF in my Icom 7800 worthless.

Same here.  Icom's implementation of APF in the '7700/'7800 is really an
"Audio Passband Filter" with low Q.  It's really no different than narrowing
a DSP passband filter.

What's unique about the FT-1000D's APF is that the Q is very high, although
its affected with APF tuning.  The high Q of the circuit forms a very narrow
filter with fixed gain, and variable peaking frequency.

Paul, W9AC

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