[Elecraft] K3 APF

[Bill W4ZV]

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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