Re: APF For K3

Posted by Merv Schweigert on Oct 25, 2010; 7:29pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5672072.html

  The benefit of APF is not selectivity to seperate signals at all.  its
the
boost of a signal in the noise level that brings it up out of the noise
by peaking a particular audio freq.   It is used to make copy of a signal
that is in the noise possible that is otherwise not possible to copy.

Also not all FT-1000D were created equal,  early models were great,
middle and later models were not effective at all, so its all on which one
you tried at the time.  Many operators converted the newer models to the
old circuit by changing a few component values.
Merv  K9FD

> I've used both the APF filter in the FT-1000 and an external audio filter (Timewave DSP-599zx), but never found them useful for CW.  The filter in my head always seems better at picking out the desired signal than the audio filter, so the audio filter just doesn't help.  Others my find differently, of course, though the filter in my head probably isn't an exceptionally good one.  There are some very good cw contest operators who do nearly all their operating using the SSB filter.
>
> Scott  K9MA
>
> Scott Ellington
> Madison, Wisconsin
> USA
>
>
>
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