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Re: [TCML] Still Interference from Tank Circuit

On 5/8/13 8:57 PM, Brandon Hendershot wrote:
Hi John,

I'm not sure how the house is wired, if that's what you're asking. The coil
and the computer are plugged into neighboring outlets, maybe six feet
apart. I can definitively say they're on the same circuit, possibly in
parallel, but I can't say for sure.
Something that occurred to me recently, the tank circuit was positioned
rather close to the computer while I was testing, no more than two feet. Do
you think there could have been enough power going through the test leads
(no coils, mind you) to radiate enough energy to effect the computer not so
far away?

Sure. That could be an issue. For the fields from a TC, what you're really worried about is the magnetic field, which means you want to minimize the "area of the loop". That is, keep opposite sides of the circuit near each other, so the area "inside the loop" is as small as possible. Same applies to your victim equipment. If you have the computer at one end of the table, plugged into one outlet, and the monitor at the other end of a table, plugged into a different outlet, then you have a huge loop: outlet 1, power cord, computer, video cable, monitor, power cord, outlet 2, wire inside wall. That big loop picks up the fields from your TC and puts them inside your equipment.

I'd sink a few dedicated ground rods, but the soil here is far too rocky
and dry to get anything makeshift done adequately.

dedicated ground rods don't usually help with EMI problems. OFten, they make it worse because the long wire to the rod acts as an antenna.

I suggest reading http://www.audiosystemsgroup.com/RFI-Ham.pdf for a discussion of this kind of thing. In particular he talks about issues with inappropriate grounds: pin-1 problems, for instance.


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