[Elecraft] K3 - DSP ringing on CW & SSB

[Berni G0IDA]

Thank you all for the replies.

I would just like to clear up a few things:

I'm going to call it DISTORTION and not ringing as ringing is more 
related to crystal filters as G4ILO pointed out and it is not filter 
ringing which I have recognized in some previous rigs I've owned. I just 
didn't know how to call it.

The distortion happens irrespective of filter used, even with the 2.7KHz 
and the WIDTH opened right up it is still there.
The effects "AFX" makes no difference.
I am using stereo headphones.
I don't have a waterfall program... can someone suggest on please.

I've noticed when listening to my desired CW signal at a beat frequency 
of 650Hz the signal is clear & only occasionally distorts but when 
tuning the same signal and moving up in frequency at about twice 650Hz 
(1300Hz) it starts to distort.
On SSB it is more pronounced as you tune.

I hope there will be a fix for this.

Does anyone else suffer from this?
I have read the PSK thread but I'm more interested in CW users in 
particular.

Berni
G0IDA


Robert Carroll wrote:
> I'm not disagreeing with Julian at all  but wanted to toss out some related
> ideas.   The noise you hear does become colored as you crank down a properly
> designed DSP filter--and centered on the filter freq.  On the other hand
> some poorly designed filters are excited by energy near the center freq and
> do ring.  I have a rice box reviewed in a recent QST, and the review pointed
> out the filter is so bad at 100Hz and below it becomes unusable.  A little
> noise crackle and ringing like a bell begins and does not drop much for a
> few seconds--tough on high speed cw.  Another phenomenon to consider is
> aliasing.  This has popped up in a few versions of Orion software causing
> ghost signals to appear in the subreceiver.  I was recently amused to find
> an audio discussion of this in which someone commented about a ghost band
> playing.  Here's a link  http://www.dsprelated.com/showmessage/24519/1.php
> .  I would really be surprised if the K3 had any of these problems.  So far
> I haven't bought one but I am creeping up to it.
>
> Julian, I really like your VOAProp package.
>
> 73
> Bob W2WG
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Julian, G4ILO
> Sent: Saturday, August 30, 2008 9:17 AM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 - DSP ringing on CW & SSB
>
>
> Perhaps I don't understand the meaning of the term 'ringing' but it seems to
> me that on any radio when you use a narrow filter you hear a sort of ringing
> noise that has a pitch of the frequency the filter is centered on. It's an
> inevitable result of the fact that you are not hearing an even distribution
> of noise across the whole audio spectrum, but a narrow segment of noise
> whose amplitude distribution follows the shape of the filter. In other
> words, I think it's normal.
>
> -----
> Julian, G4ILO. K2 #392  K3 #222.
> http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
> Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
>   

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