[Elecraft] Electric fence QRM?

[Ron D'Eau Claire]

The very few electric fence systems that I've been involved with beyond
touching the wire (Ouch!!), used a dc/dc converter to charge up a =
capacitor
at a high voltage level. The dc/dc converter took a relatively low =
battery
voltage up to several hundred volts, but at a very small current. It was =
the
capacitor that stored enough joules to make the "Ouch!" real when coming =
in
contact with the wire.=20

The charging mechanism refreshed the charge on the capacitor at a rate =
of
about 1/second. That makes me think the "ticking" you are hearing is the
recharging process. The leakage to ground from the fence discharges the =
caps
until the next recharge cycle, then you hear a tick as it is suddenly
brought up to full voltage again.=20

I would suspect that you will need to install RF chokes between the =
charger
and the fence to stop that noise.=20

The most common noise that I've heard from fences sounds like a =
continuous
"frying" noise. That's really tough to fix, since it's almost always the
result of  leakage to across bad connections along the fence. It's very
similar to some of the worst of the power line noise that sometimes =
occurs
when insulators get dirty.

Ron AC7AC
K2 # 1289
-----Original Message-----
My neighbours adjoining field has a fence which to me looks in poor =
shape.
The fence is of rope with a fine strand/s of conductor woven in and to =
make
joints in the rope it is just knotted,  I can hear ticking (as in =
arcing)
from these 'joints' I've tried wire bonding across a couple of these
'joints' which seems to eliminate the arcing but this does not do =
anything
for the QRM....
I'm using a K2 and the NB sometimes helps a little but doesn't eliminate =
the
QRM which sounds like a regular ticking about once per second

Any advice appreciated, thanks,

Deni, F/GM3SKN
.