[Elecraft] K3 Noise Reduction

[Greg - AB7R]

Hi Stephen.  I'm surprised with your NB comment regarding electric fences.  I have one 
for my horses and on 40M and up it does a great job with the pulses.  below that they 
are still there though much reduced.  Are you trying a combination of the DSP and the 
IF NBs?  Is your pulse generator well grounded?

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065


On Mon Apr 27 13:57 , Stephen  Prior  sent:

>I agree, I have used my K3 for almost a year now and I don't recall one
>situation where the NR was more effective than the filtering between my
>ears, whether on ssb or cw.  As much as I have and continue to enjoy the
>radio, I must say much the same about the NB performance.  It was very
>enlightening to hook up my FT-817 to the main station antenna the other
>night and find that the 817's noise blanker did a far better job than the
>K3's in getting rid of the interference from the electric fence which keeps
>the foxes away from our chickens!  I don't have any DSP on my K2 so I can
>draw no comparison there.
>
>On a really positive note, the one thing which makes the K3 so special to
>listen to (on headphones at least) is the AFX. I would not want to be
>without it.  And in all other respects the K3 is a very fine radio indeed.
>
>73 Stephen G4SJP
>
>K3 #980
>
>
>
>On 27/04/2009 21:43, "WA6L" wa6l at arrl.net> wrote:
>
>> 
>> 
>> 
>> Hi, Roy,
>> 
>> As I approach a year's ownership of the K3, I have to say that there are
>> very few times that I find the NR capability to be useful.  On a very noisy
>> band and with reasonably wide bandwidths (> 800 Hz) the NR can work well,
>> but never without pressing the Level button and optimizing the setting each
>> time.
>> 
>> When I compare the K3's NR with my K2's, the K2 seems far superior to me.
>> It may be because the K2 does its DSP at the audio instead of the IF, or it
>> may be that the K2 implements longer FIR filters.  Whatever the reason, the
>> K2's noise reduction works much better and in my shack is left on almost all
>> the time.
>> 
>> Both the K3 manual and the Wikipedia explanation of the K3 noise reduction
>> recommend using NR only with a wide bandwidth, and imply that it is not as
>> effective on SSB as it is on CW.  I concur with these recommendations, but I
>> have to say that I agree with you.  The NR implementation could have been
>> done much better.
>> 
>> 73,
>> 
>> John
>> 
>> 
>> 
>> Roy Morris-6 wrote:
>>> 
>>> When I turn on NR the audio noise level goes down.  When a SSB signal is
>>> received the audio peaks.  I have my RX EQ set flat.  In these peaks there
>>> are resonances in my internal speaker (if I use it) as well as my two
>>> external speakers that plainly makes noise reduction unpleasant.  It can
>>> be minimally tolerated at F-1-1 level with speakers.  It is somewhat more
>>> tolerable with a good headset.  Part of the problem may be in speaker
>>> response, but I also think a big part of the problem is in the noise
>>> reduction algorythms.   If noise reduction is not recommended with reduced
>>> bandwidth in CW, and unpleasant artifacts occur in SSB; then I find NR to
>>> be useless.  I hope the discussion of white noise and pink noise will lead
>>> to something that will improve the noise reduction function in the K3.
>>> Roy Morris  W4WFB
>>> 
>
>
>
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