[Elecraft] KNB2 does not work on my power line noise

[Vic Rosenthal]

Roger Marrotte wrote:

> He turned on his K2 and let me hear his power line noise.
> It sounded just like mine.  He turned on his noise blanker and the noise was
> gone.  I then connected my K2 to his antenna turned on my noise blanker and
> the noise was gone!  I guess my noise is different enough for the noise
> blanker not to work on it.  Does anyone have any suggestions for me.

The noise has to be composed of short, sharp pulses for the NB to help. 
  Most power line noise is NOT like this, actually.  By the time you 
hear noise, it's gone through the high selectivity part of your rx and 
been broadened, so sometimes it's hard to tell by ear whether the NB 
will work without trying it.  You can try to get the power company to 
fix the problem, or you can try a noise cancelling device (MFJ makes 
one).  The noise canceller is a little unwieldy to adjust and doesn't 
allow for fast QSK, but there are situations in which it can eliminate 
noise that can't be dealt with otherwise.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco