[Elecraft] K3 -Advice: how to configure APF for least ringing

[Matt Zilmer]

I should have mentioned that APF is set the way it's set.  I don't
believe any parameters exist to change APF's operation.  Someone may
correct me on this.

APF is best used with a narrow bandwidth setting.  I think I saw the
figure 30 Hz (for -6dB points) used in conjunction with APF, so a 50
or 100 Hz filter setting seems in order.  That's what I use here.

73,
matt W6NIA

On Fri, 10 May 2013 17:33:35 -0700, you wrote:

>Best used when copy any other way is impossible due to a weak signal.
>Ringing is somewhat better than noise, isn't it?
>
>I've found APF useful in a number of QRP events, when handling weak
>signals is the order of the day.  Yes - copy may be dificult but at
>least you have something to work with.  APF is similar to Q-mulipliers
>we used in the 70's and earlier, prior to digital signal processing.
>
>By memory, the K3's (and KX3's) APF is an order of magnitude better
>than a Qmult.  Imho, it is mainly due to the excellent DSP work by
>Lyle Johnson.  Of course, some of the difference is also due to the
>relatively poor receivers we had back then.  
>
>73,
>matt W6NIA
>
>On Fri, 10 May 2013 23:46:24 +0000, you wrote:
>
>>As a 98% cw operator, I've explored the various K3 weak signal features. 
>>I tend to shy away from the APF because its ringing seems to my ears to 
>>be counter productive. Any advice/experience on how to set up and use 
>>this feature for best results? Thanks.
>>...robert