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Re: [TCML] RF GROUND EXPERIMENTS



What about an artificial ground - as is used for Ham Radio setups? As far as I can tell they look just like antenna tuners, so I'm guessing you would tune a random wire counterpoise to resonance with your coil. Would this provide any benefits? Obviously the rating of the artificial ground would have to be sufficient for the coil's power, but they are readily available for >1kw. Would this provide any benefit for a non optimal ground - like say a 2 foot pipe pounded into the ground? I'm thinking I'll probably need to go the counterpoise route myself with my new coil because I can't install a ground here other than maybe a 2 foot piece of copper pipe... Or water pipes. Which brings me to another question;

In the past I used a water pipe for grounding with a degree of success. That was years ago in my parent's house. Now I'm finally getting back into coiling. I was thinking of clamping on to my water pipes here for my new coil - it's only a small OBIT table top coil, much less power than my old one. However, I noticed that there is a ground wire connected between the water pipe and the gas pipe in my house. I would guess that the purpose of this is to prevent electrostatic buildup on the gas pipe. Would dumping 300 watts of RF power on to this present a serious safety risk? I'm guessing that if all of the connections are good and that water pipe is a decent ground then no - but I'm worried that they may be a chance of "catastrophic failure" if somethings not quite right... Is this a legitimate concern, or do you guys think it would be safe to use?

Thanks,
Troy.


jimlux wrote:
Fritz W. Egli wrote:
Jim succested the Counterpoise groud solution, if a "convential" HF
earth is not in reach.

My questions:

Is this wire carpet to be layd on the floor direct under the coil? (coil system standing on this wire carpet?)

Yes...


Is Wire carpet conected to secondary bottom, NST case and to wall
plug ground?


Yes.. Definitely to secondary bottom (with short direct wire).. also should be connected to electrical safety ground (so that if something shorts to the ground screen, like a HV wire, you don't have a safety hazard).

One could put a RF low pass filter on the safety ground connection.. (i.e. a big choke).. The safety connection is for DC/line frequency signals.


Is this solution also OK, if applyed, say in third floor of a
building -?

Yes, it works just fine..

If floor is not concreet, but wood? (a Swiss alp cottage...)

Sure..



I keep you buisy .. Fritz






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