# Re: [TCML] Still Interference from Tank Circuit

```That sounds like your problem then, get that Tesla coil away from the computer! =)
Move it away, and use a different father away outlet. If the problem persists then it might be a grounding thing, if not then your coil without a coil is radiating enough to screw up the computer.

Cheers,
John "Jay" Howson IV

"Why thank you, I will be happy to take those electrons off your hands."

----- Original Message -----
From: "Brandon Hendershot" <brandonhendershot@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, May 8, 2013 11:57:14 PM
Subject: Re: [TCML] Still Interference from Tank Circuit

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

Thanks,
Brandon

On Wed, May 8, 2013 at 5:12 AM, <jhowson4@xxxxxxxxxxx> wrote:

> Correct me if i am wrong TCML,
> But don't you want to run the dummy load in series with the primary coil?
>
> By removing the primary inductance, your tank circuit is seeing a much
> higher oscillation frequency (just play with the LC circuit equation to see
> this). A s the only inductance for the LC circuit at that point is simply
> the wires connecting everything together, which is low.
>
> What you want to do, is have it oscillate at your desired frequency (so
> add your primary back in) and then use the dummy load in series to
> dissipate power, simulating the power transfer to the secondary .
>
> The high frequency you are currently seeing might be better at radiating
> and thus screwing with your electronics, pulling the frequency down to
> normal levels might solve your problems, maybe...
>
> Where is your ground wire going? Like is it routed in the walls to travel
> past your computer?
> One thing you could do, would be to make a dedicated ground for your Tesla
> coil, (not the RF ground) but run a wire specifically from your house
> ground outside to your coil power plug, and make sure the whole thing is in
> the metal pipe to prevent the ground wire from radiating. Or have a second
> ground some where nearby I suppose, but not too close as the RF ground
> should be the shortest distance away.
>
> What does the list think if these suggestions? I'm just throwing around
> ideas that seem to be reasonable.
>
>
>
> Thanks,
> John "Jay" Howson IV
>
>
> "Why thank you, I will be happy to take those electrons off your hands."
>
> ----- Original Message -----
> From: "Brandon Hendershot" <brandonhendershot@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Wednesday, May 8, 2013 12:00:06 AM
> Subject: [TCML] Still Interference from Tank Circuit
>
> Hi All,
>
> Last week I decided to hook up my old dummy load and give the new tank
> circuit a test run. I've got four 15/30s in parallel running with an EMI
> filter on the primary. The case ground from the NSTs is connected to the
> case of the EMI filter to mains ground. I don't have the primary coil
> hooked up, just a string of three 500W halogen lamps.
> It seems there's still lots of lovely RF being fed back through the house
> wiring as my PC was rendered completely frozen during the test. I made sure
> to switch off the power strip for further testing, but I still don't like
> the fact that running the tank circuit alone is going too wreak havoc.
> Any further efforts I can make to reduce this interference? And changes in
> wiring? I'm using a Terry Filter and I've got ferrite collars on the mains
> wiring as well.
>
> Thanks,
> Brandon H.
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