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Re: potential gain vs. power in TC systems



Original poster: Steve Conner <steve@xxxxxxxxxxxx>

Hi Paul, all,

I would go one step further and say that anyone tuning a magnifier empirically would end up avoiding that condition by a country mile. If the entire output voltage appears across the extra coil at any time, then the extra coil would flash over before the system reaches the maximum "Watts number" it would be capable of with a tuning that gave a more even voltage gradient along both coils. So I believe Richard Hull's magnifier couldn't have been "correctly" tuned and would have self-destructed spectacularly if it was.

My own current belief is that as long as you make the characteristic impedance of the resonator anywhere between 50,000 and 150,000 ohms, the coil will perform well. I used 50,000 for my last DRSSTC and it has produced sparks 4.3 times the length of its secondary.

If I was constructing a magnifier I would make the secondary and tertiary of more or less the same diameter and wire gauge. To all intents and p urposes I would be taking a 2-coil system and cutting the secondary in two pieces. I would also use a DRSSTC driver to excite one of the two lower frequency modes, where the secondary and tertiary resonate together almost as if they were a single coil, and avoid the higher frequency mode that (AFAICS) generates a lot of voltage on the transmission line without contributing much to the output.

I would also minimize the transmission line capacitance to keep this unwanted mode as far in frequency from the wanted one as possible. The idea would be to distribute the voltage evenly across the whole coil system and so get the highest output voltage before flashover.

Steve
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Probably true for most magnifiers. But if the system is tuned
corre ctly for 'complete' energy transfer, the entire output voltage
will appear momentarily across the 3rd coil: peak topvolts is tuned
to occur at the same instant that the transmission line voltage is
momentarily zero. That state of affairs is very unlikely to
happen except by very careful design and tuning, so Steve's comment
is fair.