[Elecraft] K2 noise blanker

[K2ZR]

Perhaps there's a comment from Elecraft on the K2's Noise Blanker
Dick, K2ZR/4

Brett Gazdzinski wrote:

>Joe,
>I will try this, thanks!
>
>Brett
>N2DTS
>
>----- Original Message ----- 
>From: "Joe Planisky" <jplan at jeffnet.org>
>To: "Brett Gazdzinski" <Brett.gazdzinski at verizon.net>
>Cc: <elecraft at mailman.qth.net>
>Sent: Sunday, March 01, 2009 6:03 PM
>Subject: Re: [Elecraft] K2 noise blanker
>
>
>  
>
>>Hi Brett,
>>
>>Last summer, I had similar questions about the KNB2 in my K2.  In my  
>>case, a neighbor had put up a new electric fence and I was getting QRM  
>>in the form of a pulse every second.  The unmodified KNB2 seemed to  
>>have little to no effect on the noise.  In fact, I questioned whether  
>>it was working at all.  A 'scrape test' (connecting a wire to the  
>>antenna connector and scraping it on some metal surface in the shack  
>>to generate static) indicated that it was indeed working.
>>
>>The modification described here
>>
>>http://www.dl7maj.de/KNB2-Mod.pdf
>>
>>seemed to improve the situation.  After making the mod described, the  
>>KNB2 would partially take out the electric fence noise using the LEVEL  
>>LOW threshold.  Not perfect, but better than it was.
>>
>>You can read the original thread by searching the list archives for  
>>the topic "[K2] KNB2 vs. electric fence" that started on August 3, 2008.
>>
>>73
>>--
>>Joe KB8AP
>>
>>
>>On Mar 1, 2009, at 2:18 PM, Brett Gazdzinski wrote:
>>
>>    
>>
>>>I have tried it on various types of noises, some which sounded like  
>>>auto
>>>ignition noise, I think someone had something running without  
>>>resistor wires
>>>or plugs, strong and weak signals, no change.
>>>I did have a bad street light out front of my house, the reason I  
>>>got the
>>>NB, but they fixed it before I got the noise blanker.
>>>
>>>The main reason I asked was there seems to be no degradation of  
>>>signals with
>>>the NB on at any setting.
>>>On most rigs, you can hear a difference, and where its adjustable,  
>>>it makes
>>>things sound really bad when you turn it up. The pro 3 is like that.
>>>
>>>On the K2, I have been unable to detect it doing anything at all,  
>>>any mode,
>>>any noise, although the noise level I usually have is not bad.
>>>
>>>Thanks for the replies,
>>>Brett
>>>N2DTS
>>>
>>>      
>>>
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