Topband: Electric Fence

Sat Aug 28 10:37:34 EDT 2004

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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