[Elecraft] KX3 NR

[Wayne Burdick]

Hi Geo,

Here are the firmware notes regarding NR adjustment, which I'll also  
be including in the new errata sheet.

73,
Wayne
N6KR

* * *

* NOISE REDUCTION (NR) ADDED:  Receive noise reduction reduces the  
amplitude of random noise while preserving desired signals. (RX NR is  
different from the VFO NR menu setting, which can be used to reduce  
VFO tuning noise on the higher bands.) NR works in CW, SSB, and AM  
modes. NR has a characteristic “hollow” sound. To turn NR on/off, hold  
the NR switch. Also see RX NR x menu entry, below. Note: NR is not  
available when AGC is turned off.

* RX NR x MENU ENTRY ADDED: Allows the user to customize receive noise  
reduction (NR). The letter appearing at ‘x’  in the menu entry name  
shows which parameter is being adjusted:  B (beta; tap ‘1’), D (decay;  
tap ‘2’), or M (wet/dry mix; tap ‘3’). The defaults are recommended,  
and this menu entry is locked to prevent accidental changes. The NR  
settings for CW are separate from those for voice modes.

Using the RX NR menu entry:  Unlock the parameter by holding KHZ for  
about 3 seconds; the VFO A lock icon will disappear. Then tap ‘1’,  
‘2’, or ‘3’ to select a parameter to change. You can turn NR on/off  
while in the menu to test its effectiveness.
The default beta is 5 for CW and 10 for voice modes. A lower beta will  
further reduce noise, but may attenuate weak signals. The default  
decay is 240. A much lower decay value will allow NR to track fading  
signals better, at the expense of somewhat worse noise rejection. The  
mix value determines how much of the signal is “dry” (unprocessed) vs.  
“wet” (processed). The default is 220 in CW mode and 250 in voice modes 
—essentially “all wet”. You might want to use a lower mix number to  
reduce the “hollow” sound or to minimize the effect of NR on weak  
signals.


* * *



On Jan 23, 2013, at 8:55 AM, W2bpi1 at aol.com wrote:

> Thanks Wayne and Don for your responses. My next  question. When I  
> go to RX
> NR at the top of the screen I see anywhere from "0" to  "250". Do  
> they have
> a meaning or are they there just for ref? Anyway it does a  great  
> job for
> me.  Thanks  72 Geo/W2BPI
>
> _Don Wilhelm_
> (http://www.mail-archive.com/search? 
> l=elecraft at mailman.qth.net&q=from:"Don+Wilhelm")  _Tue, 22 Jan 2013  
> 17:34:01 -0800_
> (http://www.mail-archive.com/search?l=elecraft@mailman.qth.net&q=date:20130122 
> )
>
> We have that function right now.  The Owner's manual is incorrect.
>
> See the post by Wayne a bit earlier today, Actually he made 2   
> posts, the
> second was a clarification.
> 73,
>
> Don W3FPR
>
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