[Elecraft] K3: noise reduction performance

[Johnny Siu]

Yes, there have been improvements in the DSP of K3.  One of the reasons of 
selling my K3#46 was the artifacts of the DSP.  I have recently acquired another 
K3 in the second hand market with later production. I do notice there have been 
improvements.

I am mainly a phone operator with ocassional digital mode at PACTOR 3.  
Among the 4 x 8 =32 selections in the NR, I find it difficult to get one 
effective among the 32 choices.  From my past and present experience of my Icom 
families, I know what are the limitations of NR.

I am looking for a simple but effective NR which can cut 'some of the noise' 
with least artifacts, and also easy to work with.  At this moment, I still 
prefer the NR in my Icoms.  Having said that, I know the smart guys 
in Elecraft will keep on improving the K3 so that hopefully we will have better 
performance in later version of firmware.
 cheers, 


Johnny VR2XMC 



----- 郵件原件 ----
寄件人﹕ Ron D'Eau Claire <ron at cobi.biz>
收件人﹕ Elecraft <Elecraft at mailman.qth.net>
傳送日期﹕ 2010/11/28 (日) 12:14:47 AM
主題： Re: [Elecraft] K3: noise reduction performance

This is a good example of just how subjective "improvement" can be. 

Sure, the "hash" is gone, but it's replaced by the "underwater" warbling
sound so common with highly processed audio. 

Personally, I find that warbling variation in the audio far less pleasant
than the noise. 

Ron AC7AC

-----Original Message-----
> 
> Below are several links to audio recordings of a product I used to own.
It
> is called the BHI ANEM (Mk. II). Sadly, I sold it after getting the K3.  I
> should have hung on to it as it has become my benchmark for NR
performance.
> 
> These are some sample recordings of the ANEM being turned on and off.
These
> recordings are found on W4RT's website
> 
> 20 m SSB <http://www.w4rt.com/BHI/20Mband-ssb.wav>
> 80 m SSB <http://www.w4rt.com/BHI/80conv-ssb.wav>
> 80 m SSB <http://www.w4rt.com/BHI/80Mconv2-ssb.wav>
> 
> I've also compared the K3's NR performance to that of the Icom 756 Pro 3
> which has similar NR reduction properties - albeit not as effective - as
the
> ANEM.
> 
> Perhaps I am being subjective or overly critical, but one thing you can
> easily notice with the ANEM recordings is that speech volume doesn't get
as
> affected as the K3s.  This is really surprising to me as the NR for the
ANEM
> is AF rather than IF like what's used in our radios.  This leads me to
> believe that the ANEM's NR algorithms are more effective in reducing
> background noise while leaving speech unaffected.
> 
> What do you guys think?
> 
> Sorry for the long email. Many thanks in advance for your
ideas/suggestions.
> -- 
> 73 de James K2QI
> President UNARC/4U1UN

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