[Elecraft] [K2] KNB2 vs. electric fence.

[Vic K2VCO]

Joe Planisky wrote:
> Hey folks,
> 
> I've recently started picking up relatively strong pulses at 1 second 
> intervals on my K2.  I suspect they're coming from a new electric fence 
> somewhere in the neighborhood.  But where they're coming from is 
> immaterial to my question.
> 
> Should the KNB2 noise blanker be effective against this type of noise?  
> I've always thought that such impulse type noise was exactly what noise 
> blankers were supposed to work best on, but I hear no difference in the 
> pulses whether the NB is on or off, nor at high or low threshold 
> settings.  This is making me question whether the NB is working at all.
> 
> Any thoughts?

Some electric fences produce wide pulses, so you should try using the 
NB2 setting. If that doesn't work, you might consider increasing one of 
the capacitors that determines the pulse width in the KNB2; if you go to 
<http://www.qslnet.de/member/la3za/K2/mod.html> and scroll down to the 
KNB2 section you will see a note about it. I think the appropriate 
modification is to increase C12, which affects the NB2 setting. It is 
0.068 mf and you could try 0.1 mf.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco