Re: K3 APF Adjustable Q

Posted by The Smiths on Nov 01, 2010; 8:28am
URL: http://elecraft.85.s1.nabble.com/K3-APF-Adjustable-Q-tp5688670p5693061.html


I vote to have both.  I find that moving the Fc off center from my IF helps reduce the ringing that I get. I think you should give that a try Steve.  Keep your IF center (SHIFT) then after you have used the CWT (or your ear) to tune someone in, drop their town down 20Hz, now activate the APF, then move the APF -20Hz, you'll not only peak their signal, but you'll also have reduced a lot of the ringing noise that you would normally get sitting in the center of the IF passband.  This is argument to KEEP the Fc knob.  Now, if you choose to keep your APF centered on the Pitch center (IF Center, passband center) than I believe that the variable Q would be very handy as well.  So looks like that's argument for BOTH.. Not one or the other.
 

> From: [hidden email]
> To: [hidden email]; [hidden email]
> Date: Sun, 31 Oct 2010 08:58:57 -0400
> CC: [hidden email]
> Subject: Re: [Elecraft] K3 APF Adjustable Q
>
> If I had a choice between variable center frequency and adjustable Q, I
> would choose adjustable Q.
>
> My logic is: The center frequency automatically follows the sidetone
> frequency so I have no need to adjust it however the fixed Q has a bit of
> ring and at times I would like to back it off (widen) it just a tad.
>
> Otherwise it's a HUGE improvement, sounds great and I wish to thank those
> who made it possible.
>
> 73
> N4LQ
> Steve
>
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