[Elecraft] RE:Electric fences etc.

[Sander Wissing]

I have exactly the same problem with my neighbour's fence.  On my old
receiver (Echophone EC-1A) this ticking was a big problem.  After
graduating to a Icom 740, the ticking was pretty much still the same,
the IC-740's noise blanker not making too much difference.  We were
heading for a neighborhood war... Then I got my Icom 706 and voila!
Switch on the NB and the ticking is completely gone, switch it off and
it is there, same as always.

I have planned to get my K2 with NB, for this very reason.  Surely if
the 706 can do it, so can the K2?  If not, maybe I should go back to the
war!

Cheers
Sander Wissing
ZSL103


>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.