[Elecraft] K3 APF

[The Smiths]

Are you sure that the problem isn't your REF CAL settings are off from where you think they are?
 
> Date: Sat, 13 Nov 2010 15:02:43 -0800
> From: btippett at alum.mit.edu
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 APF
> 
> 
> 
> KK7P wrote:
> > 
> > 
> >> The APF algorithm is unchanged. Lyle is going to verify.
> > 
> > They are identical.
> > 
> 
> Maybe not quite identical. The new algorithm is zero beat and the initial
> one peaked at +10 Hz above zero beat. It could be that guys were not tuning
> to the actual peak so the residual ringing could have been several dB
> stronger than the signal (relatively) making one think there was more
> ringing. Now the zero beat signal may appear stronger than the residual
> ringing (on noise) since it is better centered. BTW the filter response
> measures about -4 dB at a 10 Hz offset, which is quite noticeable on weak
> signals.
> 
> I personally don't notice any difference but I had been peaking each signal
> using VFO-FINE in 1 Hz steps (which is how I found the +10 Hz offset in the
> initial version). 
> 
> 73, Bill
> 
> 
> 
> 
> 
> 
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