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

[Ed Stallman]

I work mostly CW weak signal and have not heard ringing with the K3 .. 
Now I will say if you have your tones "CW Pitch" set at 800 Hz + or - it 
may sound like ringing to you , you might try lowering the CW Pitch say 
around 600 Hz or even lower

Ed N5DG






On 5/10/2013 7:36 PM, Matt Zilmer wrote:
> 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
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