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

[paulb]

Hi folks

Interested to read the thead on electric fences. 
They are very common here around New Zealand,
even in semi rural areas. The trick apparently is not the 
actual voltage which hurts, it's a gradual rise time which
causes muscle contraction.  I suspect this is why some
fences are hard to knock out with the noise blanker.
Certainly the high end devices in use down-under really pack a 
punch, and can supply energy to miles and miles of 5 wire 
fences. They are designed to simply burn off any
grass or weeds which grow around the wires. 

My K2 works more or less on local fences, using 
low threshold. Sometimes it has very little effect.
This could be related to pulse shape and width.
Interestingly the K3 also is not so flash, 
the old Kenwood TS520S was a trooper
in this dept.

cheers 

paul b




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?

73
--
Joe
KB8AP

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Elecra

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