On 29 abr, 15:50, Cecil Moore wrote:
Wimpie wrote:
I think inter-winding capacitance does not decrease efficiency, it may
only change the radiation pattern when the inter-winding capacitance
is that much, that the current distribution in the coil is affected.
This is almost the case with relative large loops.

This is almost *always* the case with relatively
large loops?
--
73, Cecil http://www.w5dxp.com


Hello, Cecil,

Yes you are right, as soon as electric flux is leaking via inter
winding capacitance, the current distribution is no longer uniform.

Maybe Bill can find more info when searching for Tesla coil inductors.
I made a small one myself (H-bridge, running at about 700 kHz, [yes, I
know it is in the AM broadcast band]). The vertical coil behaves
almost as a quarter wave resonator, just a small top capacitor was
necessary.

Best regards and thanks for the correction.


Wim
PA3DJS