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http://www.arrl.org/tis/info/HTML/elec-fence%20noise/
http://www.arrl.org/tis/info/pdf/9604062.pdf
17. Fence chargers and phone, radio, and modem interference.
A. All Parmak fencers are thoroughly shielded and filtered against radio, television, and telephone interference. When interference occurs, it is usually caused by one or more of the following:
1. A current leak to ground at some point along the fence line. This may be a result of very dirty or cracked insulators, wire touching a post, trees, a building, or vegetation.
2. A loose connection in the fence wire, possibly due to poor splices, gate opening, or a rusted wire.
3. Poor ground connection.
Any of these conditions could cause a "spark gap" resulting in a spark jumping the gap when the controller charges the fence wire. When the spark jumps, it acts as a broadcast antenna and noise is transmitted to all radios, telephones, televisions, etc in the immediate area. A careful check of the fence wire installation will disclose the trouble. Two people checking together will help locate the source more easily.
To determine if the fence controller is at fault, disconnect the controller from the fence wire (ground and fence wire), letting the controller operate while disconnected from the fence installation. If the noise continues with the fence disconnected, the controller is at fault and needs repair. You can return the fencer to the factory for the necessary repairs.
If you do not get the clicking with the both the fence and the ground disconnected, only connect the ground and do the same test for the clicking. If you do get the clicking, the problem is your ground is too close to your main house ground system. Try moving your ground rod further away from the house or the main ground. If you don’t hear the clicking after you connect the ground rod or move it, the problem is in your fence line. You should check the fence line for a loose connection in the fence wire possibly due to poor splices, gate opening, rusted wire, or cracked/damaged insulators.
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http://lists.contesting.com/_towertalk/2003-12/msg00207.html
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