Oh Boy...Need Help With Electric Fence Pulses

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eHam.net Forum : RFI : Oh Boy...Need Help With Electric Fence Pulses

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Oh Boy...Need Help With Electric Fence Pulses	Reply
by KG4ROQ on November 18, 2006	Mail this to a friend!
Have you gentlemen ever dealt with the problem of having an electric fence very close to your shack and the pulses driving you bonkers? Even to the point of crushing the electric box into the fence? Well that is where I am now. Any suggestions as to what I can try besides building a $250,000 permanent fence? Thanks in advance for any suggestions. Wes W4KMG

RE: Oh Boy...Need Help With Electric Fence Pulses	Reply
by K8AC on November 18, 2006	Mail this to a friend!
Is it your fence? One of my neighbors has an electric fence that was driving me crazy on the low bands in the winter time. I approached him and told him about the problem the fence was causing and ask if I could take a look at it. I told him I'd be willing to correct the problem at no cost to him. It turns out that he had installed it himself and there were no less than 52 splices in the 3 wire, 3/4 mile long fence. I had originally planned to use a portable AM radio to find the offending arcs, but the splices were so bad that I could hear them arcing by ear. After fixing all the splices and weather proofing them, the noise was gone. The next year, the gate connectors had deteriorated again causing noise so I replaced them. Had to do that one other time, but I've been a couple of years without noise now. In my experience, an electric fence CAN be quiet if its properly installed and maintained. Another aspect of maintenance is keeping weeds and grasses trimmed so that they don't come in contact with one of the wires. Also - check all the post insulators and make sure the wire isn't touching the post or a nail.

RE: Oh Boy...Need Help With Electric Fence Pulses	Reply
by KG4RUL on November 19, 2006	Mail this to a friend!
Unfortunately, the design criteria for a modern electric fence charger are: High Voltage pulses; Extremely fast rise and decay times. This is done to meet the mandates of the Underwriters Laboratory (UL) that limits the allowable VA of each pulse (referred to as "power under the curve"). Combine this with a current delivery system full of non-linear junctions (rusty/corroded connections) and you have the perfect RFI generation machine. The older, non-pulse type chargers, used a thermal timing device to turn a high voltage, high current transformer on and off. This device, often known as a "weed burner", literally fried the tips off weeds and grass that touched it. They were even worse for RFI! Dennis KG4RUL

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