[Elecraft] K3 DSP Rev D - some of the findings

[juergen]

Hi Johnny


You might also want to read about why some aspects of the K3.'s performance makes it sound harsh. Some interesting information on Marks blog page. Mark is not the only person that has observed that the K2 sounds "sweeter" than the K3 on weak signal CW. 

Mark also found that there was less ringing on the Ten Tec Orion's narrow DSP filters. DSP algorithms and how they are implemented play an important role as to how a radio ultimately performs.  Here is an example where it is has been measured.

http://pa5mw.blogspot.com/

I have seen no comment that the DSP revision D board improves Inband  IMD. It will be interesting to see if it does improve RX inband IMD.


73

John

--- On Fri, 1/1/10, Johnny Siu <vr2xmc at yahoo.com.hk> wrote:

> From: Johnny Siu <vr2xmc at yahoo.com.hk>
> Subject: [Elecraft] K3 DSP Rev D - some of the findings
> To: n5ge at n5ge.com, Elecraft at mailman.qth.net
> Date: Friday, January 1, 2010, 4:17 PM
> Hello Group,
> 
> Thanks to all the emails "off-the-list" answering my
> questions about the the benefit of DSP Rev D modification.
> 
> Although none of those emails is officially from Elecraft,
> I would summarize the findings as follows:
> 
> 1. the modifications will have no effect on the key RX
> performances such as BDR, IMD, MDS etc;
> 2. the modifications are related to the artifacts in audio
> spectrum generated from the DSP;
> 3. some of the K3 users do not have problems the DSP
> artifacts even without the DSP Rev D modifications because
> they didn't even hear the artifacts;
> 4. for those K3 users who can hear the artifacts, the
> modifications did lessen their listen fatigue;
> 5. the modifications may be also useful for those users who
> would like ESSB
> 
> I have thanked all those replied to me off the list
> individually.  Should I miss any of you from the reply
> list, please forgive my oversight.
> 
> This group is wonderful.  I have been given the chance
> to learn more radio knowledge from the experts who in fact
> gave me personal attention by answering my questions
> off-the-list.
> 
> Of course, some of you may find my questions are 'baby
> standard' or even 'why border to ask?'  If it were the
> case, please relax a bit and give me, a NON-RADIO man by
> profession, the chance to ask and educate myself.
> 
> 73 & HNY,
> 
> Johnny Siu VR2XMC
> 
> 
>      
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