There are AC types that won't have the periodic pop. I recently
"electrified" a metal bird feeder because the raccoons were raiding it
nightly. If there is no leakage then the line is RF quiet. With any
leakage the hash is continuous just like a power line leak. Since you
control the maintenance of the fence you might want to consider the AC
type. The one I bought was a "FiShock" brand. Internally it is a
simple transformer with two separate bobbins with the secondary at
1.2kv. It makes a pretty nasty looking arc if taken across the output
terminals but is supposedly humane.
Their catalog is available from their web site at
http://www.fishock.com/. They are located here in Knoxville but I have
no connection to them.
I bought mine from Home Depot.
Pat
wa4tuk
ABowenN4OO wrote:
At 08:09 PM 8/27/2004 -0400, you wrote:
The white tail deer here in Eastern Pennsylvania are eating my wife's
landscaping and she wants to install an electric high tensile wire
fence around the property. That means horizontal wires only 1/4
wavelength away from my new pride and joy, a 4 square array on 80
meters.
Will the horizontal wires attenuate the signals into the vertical array?
Will they change the impedance of the nearest elements so much as to
significantly perturb the array's pattern?
=====================================
I have to fence my garden to keep the deer out. The Fish and Wildlife
"experts" claim that the fence has to be 8' high to keep them out.
They will also go under if your lowest wire is too high.
I made the first wire at about 30" and a second one about 45" or "nose
height" on your deer. Ours are smaller than northern deer. The rest of
the wires do not have to be electrified, since a jumping deer will not
completed the electrical circuit required for a shock.
I have only a couple of trees that can be used, so for the rest of the
posts, I used 1 1/4" PVC pipe over cheap 5' steel fence posts. If you
use the more sturdy 6 ft fence post, you probably will have to use 1
1/2" PVC. BTW, I use the same scheme for my Beverage antennas.
The lowest wires, the ones the deer will contact, should be steel
fence wire. We buy that locally in 1/4 mile spools for 11-12 bux a
spool (#17 galvanized). I used insulators on the PVC pipe which may be
overkill. I just figured that during wet weather, the PVC would not be
a good insulator for HV. I have no measurements to back that up.
The top one should probably also be steel fence wire, but electrifying
it does no good unless you have deer that can stand on their hind
feet. In between, I used 30# monofilament fishing line. It is cheap
and effective. They will poke it with their nose or head and decide
that it is an obstruction. I have had them try to go over, but not
through the mono.
Electric fence controllers usually operate at about 1 second between
pulses. Depending on proximity of your receiving antenna to the wires,
you will hear a "click" in your receiver. If you have imperfect
insulation and a spark gap somewhere, the click will be much louder. I
can barely hear mine (in the rcvr) when it is operating correctly, but
if a leakage path develops or there is a poor connection as at a gate,
then the system will arc. You can actually hear it snap when you get
close to it.
I also use a light sensistive switch to turn it on and off.
My garden is about 75 X 75'. I am going to change this year and put
netting around it. Nylon Net Company makes netting for bird and deer
control. One model is 7' tall. I can install that on my PVC poles and
then use a single electric wire for the space below to keep them from
going under.
Early on, I put just the single wire. That worked for just one season.
They soon found they could easily jump that. I added a second wire at
about 45" and that also worked for a short time. Eventually, they
jumped that also. So far, they have not gone over the 8 footer,
although I did see a bent wire one morning, indicating that one had
tried and then decided to go elsewhere.
You can get a catalog from Nylon Net Company at www.nylonnet.com 1
800 238 7529
You can buy other fencing materials from Agri Supply
www.agri-supply.com 1 800 345 0169
You may also have local suppliers for the same materials. Nylon Net
also offers some braided ropes and twines at reasonable prices and in
lengths you can't get at the big hardware stores.
1 800 238 7529
INK N4OO
Sopchoppy, FL
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