[Elecraft] RE: How does K2 NB work?

[Tom Hammond]

Fellas:

For an off-the-air demo of how well MY KNB2 works, you might want to check out:

   http://www.n0ss.net/knb2_demo.zip

This recording was made during a real-time QSO, and NOTHING special 
was done. I just hooked the K2's AF output to the laptop PC and 
started recording while I enabled the KNB2 and then stepped thru the 
two available modes.

The file is ZIPped because it's really a 2MB WAV file. SO you'll have 
to UNZIP it before you run it.

Enjoy!

73,

Tom Hammond   N0SS

At 02:58 PM 8/27/2006, AA5CK wrote:
>If you have any doubts whether your K2NB can handle pulse type noise 
>here are a couple of simple circuits that can either ease your mind 
>or send it to the bench.
>
>The first is a pulse-generator/signal tracer/audio amp that works 
>well as such and produces a 10uS pulse. A 2N3904 and 2N3906 may be used.
>
>
>http://www.electronics-lab.com/projects/oscillators_timers/012/index.html
>
>The second produces pulse widths of approx. 10uS to 500uS with C1 
>values between 470pF and .047uF.
>
>            http://www.electronics.50g.com/cpg.htm
>
>Also don't forget, as others on the list have noted, sometimes the 
>preamp must be used to amplify the noise enough to trigger the K2NB.
>
>Good Luck...Ted...aa5ck
>
>David Walker wrote:
>>It doesn't.  Don't waste your time on this option.
>>
>>
>>>Thinking of building my 2nd K2.  I wondered what
>>>the consensus is on HOW WELL DOES THE NB WORK?in a K2?
>>
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