[TowerTalk] Fwd: Canada geese

[Patrick Greenlee]

I have a quite robust modern recently purchased electric fence charger 
that puts out peak voltage spikes of over 10KV. Goes off scale on my 
digital Kilovolt meter with max displayable reading of 10KV. It has a 
transformer that emits a very audible click/thump when handling the once 
per second rep rate pulses. It is very noticeable on 160 through 6 meter 
bands.  The charger itself is inside an all metal building (Faraday 
cage,) while the fence of course (not inside the building) acts as a 
transmit antenna for the RFI.  Luckily I have some noise blanking 
options on my Flex 5000 A  and one of them makes the RFI pulses inaudible.

There may be a charger out there somewhere that doesn't cause RFI but 
not the powerful ones I use or other cattlemen in the area use.  Even if 
a charger does not radiate significant RFI itself nor propagates RFI via 
its big antenna (fence) with dew or rain on the insulators, a blade of 
grass, weed or whatever gets within arcing distance and you will get RFI 
from those arcs.  Slinky gates and such with a little corrosion on their 
contacting surfaces (where you open and close the  gate) will arc 
sometimes. Arcs make wideband RFI.

Patrick        NJ5G


On 2/16/2018 7:41 AM, Hans Hammarquist via TowerTalk wrote:
> The modern electric fence don't emit RFI any longer asthey don't work with the very short pulses they used to use.