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

[N8XPQ]

Good Day to all,

I have had prior problems with my neighbors electric fence used to contain
his horses. I don't have much experience with the NB in the K2. i am using
the K3 which does a wonderful job. I guess the first thing I would do is
make sure the interference you are hearing is in fact the electric fence. Do
this by isolating all of you equipment from your shack power source. If the
problem persists, then I would turn off all power to your house and check if
the problem is still there. If so, it is time to go mobile or portable with
the K2 and an AM receiver. I think though I shoud first confirm that the
fence is your neighbors or is it yours? If is your neighbors, I would
suggest contacting them and nicely explaining the situation. When I did
this, my neighbor was very cooperative. i explaind it as "MY Problem" and
asked him for permission to access his property to explore for the problem.
In my case the fence was located across the street and kiddie corner ,
approx. 500' away from my house. The fence covers appox. 5 acres. I found
that the problem was somewhat "weather" dependent. An example was just after
a good rain it would really take off. It seemd as possibly some large field
grass or weeds would touch the fence and act as an antenna. Upon
investigation, I found that the fence was badly neglected and had several
open portions and very poor grounding. I asked my friendly neighbor to
disconnect power from the fencing unit and guess what, the interference
vanished. I then asked him if I could make some repairs to the fence and
excplained my intentions, which I might add quickly included purchasing at
my cost, a new electrice fence module. I proceeded the jump all connections
that were hanging open in the fence circuit as well as remove the existing
the grounding system which i might add consisted of a piece of 24G wire that
was spliced several times terminating to nothing more that a large
screwdriver that was shoved into the ground. This was all replaced and
neetened up, and terminated with a nice new and shiny 8' ground rod. I
plugged in the new power unit to see if all my efforts were helpful. To my
amazement the problem was completely gone. Oh I forgot to mention, also pay
close attemtion to all splices in the fence as well as the gate hooks that
are sometimes used. The can arch over and act as quite the spark gap
transmitter. I hope this gives you a place to start. Please reply with any
further questions.

73's Mike N8XPQ

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?
> 
> 73
> --
> Joe
> KB8AP
> 
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