By the way, the 50Hz filter on the K3 is really about 80 Hz wide, not 50... If you turn on the iir filter (in the config menu) THAN you can see it squeeze down to about 50 or 60Hz width. This could be why the K3 sounds so much cleaner at such narrow width settings than other rigs. I'm not really sure that it should say 50 Hz on the display unless the iir is turned on along with it. Just my opinion.
> Date: Mon, 25 Oct 2010 14:17:15 -0700
> From:
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> To:
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> Subject: Re: [Elecraft] APF For K3
>
> On 10/25/2010 12:29 PM, Merv Schweigert wrote:
> > 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
>
> That's usually been my experience too, primarily because the skirts ring
> on QRN, and the narrower the filter, the closer those skirts get to the
> CW note. The closer the ringing is to the CW note, the harder it is for
> the ear/brain to separate them. This is pretty well known by scientists
> working in the psychoacoustic world.
>
> 73, Jim K9YC
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