[SEL] electrical help OT

[Peter A Forbes]

On Thu, 30 Dec 2004 17:25:14 EST, you wrote:

>I am in need of some electrical help concerning high powered electrical 
>cattle fence charger (7000 volts dc) feeding back on the telephone line and also 
>the main house power.  If anyone has any knowledge of these fence charger 
>problems I would like to converse directly and explain all I know and what we have 
>done trying to cure the problem.  The problem is "ticking" charger pulses on 
>the phone line that in turn affects computer modem.   
>
>Thanks,
> 
>
>Tom Schmutz

Tom:

The fence units have a battery which charges up a capacitor through a bit of
electrickery, and the capacitor is discharged through the coil (like a car
ignition coil) which gives the highvoltage pulse. The electric fence acts as an
aerial and away you go...

The pulse is such a low frequency that almost any radio or TV will pick it up as
interference. Because they are usually out in fields away from houses, they
don't cause a problem, but using them on a mains power supply instead of a
battery can cause mains-borne interference problems.

We have a couple which we used to use to keep the hosses inside a fenced area,
but don't use them now.

Peter