Re: space winding

[FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

In a message dated 8/9/00 11:16:08 AM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

>  I have a question as to this 'proximity effect'?
>  
>   As I understand it, the effect comes about due to the field generated
>  by the wire affecting the adjacent wire. Now, considering that the
>  high current carrying part of the coil is the lower, say third, of the
>  secondary, would there be any advantage in spacewinding the lowest
>  quarter, or third of the secondary and then going closewound for the
>  rest. I assume someone would have done this, is there any quantitative,
>  (qualitative - bigger/brighter sparks :-)  ), results to this method?

Robin, all,

most likely no advantage would be seen, because these effects
(spacewound or not spacewound) make very little difference in
a typical TC.  As long as the Q of the secondary is reasonable,
it's OK.  Most of the losses in a TC are in the sparkgap.  Changes
in the secondary losses have extremely minimal effect as long as
the secondary is reasonable.  However if the changes made
to the secondary indirectly reduce the gap losses, that can be
rather beneficial, and is the method I use in my TT-42 TC.  See
spark gap TC's at:

    http://hometown.aol-dot-com/futuret/page3.html

Cheers,
John Freau