Originally posted by Nhopa
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But then at the same time I'm not sure that the fact it is working off the same central heating system is a good sign in this case. That suggests to me that instead of the energy going into the earth, it's coming into another coil, and enough of it to power LEDs, so it's "easier" to light the LEDs than to go into the earth?? So that implies I need better grounding. And I suppose that also works in the opposite direction, that better grounding would lead to better reception of the radio station. Certainly no diodes blown from the radio signal yet, and I didn't spend long using them with my own power source with an LED load because I wasn't happy with the fact that to get the best output I had to connect the "antenna" lead directly to the top of the secondary.
I know the picture you mean, I think there's 3 different pictures of that coil and he has a different winding configuration in each one. In one of them it looks like he has an extra coil type of thing for the spiral as well, not only the Colorado Springs setup. Not sure if it actually is an extra coil though. I read somewhere Tesla mentioning that he preferred a flat spiral for transmitting "signals", and the 3 coil arrangement for transmitting power. I don't know if there's any "practical" reason for this, besides the fact that for power transmission you'd have to use "no higher than 20-35kHz", and making a flat spiral for that frequency would be quite a lot of work. So it might just be easier to do the 3 coil setup for that reason? That's my guess. It might be worth making a flat spiral and a 3 coil setup for the same frequency to compare things.
I'll make a diagram of how things are set up in that video anyway. It's already in one of Eric's diagrams posted here but I'll draw it exactly according to all the connections used so there's no confusion. Back shortly
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