[Elecraft] K-3 Noise Reduction

[Jim]

Johnny, look forward to seeing you at Dayton at either the Elecraft booth or with Adam.

I also find the NR on my K3 not to be one of the better ones but it is useable for me at only the very least aggressive setting. Hey! With the Icom you don't want to go past 10:30 or 11:00 o'clock because it becomes too aggressive.


73 de KE4WY Jim   

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Johnny Siu
Sent: Tuesday, May 17, 2011 10:01 AM
To: Bill W4ZV; elecraft at mailman.qth.net
Subject: [Elecraft] K-3 Noise Reduction

Hello Bill,
 
I trust Elecraft engineers have already listened to some elecrafters' comments as compared with the NR in Icom radios. Elecraft will find ways to improve the NR by regular firmware updates.
 
I have no further to add but do suggest elecrafters try the NR in the latest IC9100 if you are going to Dayton.  You will notice it is a further improvement in NR in IC9100 when compared with their big radios especially in SSB.  
 
I am going to wear my callsign / name badge in Dayton.  I trust there will not be too many Asian faces there and you can easily identify me.  Of course, I will definitely visit the Elecraft booth.
 
See you later!

TNX & 73,


Johnny VR2XMC

從︰ Bill W4ZV <btippett at alum.mit.edu>
收件人︰ elecraft at mailman.qth.net
傳送日期︰ 2011年05月17日 (週二) 8:06 PM
主題︰ Re: [Elecraft] K-3 Noise Reduction


KK7P wrote:
> 
> In the end, NR is a filter, and like any filter it will affect what is 
> being passed through it.  The weaker the signal, the more it appears 
> like noise and the harder it is to separate the two.
> 

This is why some of us use a relatively wide DSP filter (4-500 Hz) when listening to ultra weak CW signals...so our brain's DSP can do a better job of separating the signal from noise.  If you have an extremely narrow DSP filter (either set by WIDTH or NR), noise going through that filter can cause ringing which interferes with the signal.  Some of you may have noticed the same effect with APF.  

I never use NR because it's essentially doing doing the same thing as reducing WIDTH.  However I do find APF can help in some cases (again with a fairly wide WIDTH setting) but it appears to be more effective in impulsive noise (i.e. lightning induced) rather than white noise (i.e. galactic noise).  That's the opposite of what I expected but that's how it works for me.

As Lyle said:

> Finally, NR is part of a general field of psychoacoustics.  What some
people like, others barely tolerate.  Somewhat like tastes in music... 

Each must experiment to see what works best for your own brain/ears.

73,  Bill
 

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