Re: Flat coils & undamped waves (was Wire Length)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

There may be one advantage in using flat spiral coils - they may have 
more self capacitance and hence allow a lower resonant 
frequency.  But aside from that, I can't see any serious advantage
Mike"

   As a general rule that self capacitance (probably quite small) 
will probably increase losses.  Tesla describes coils wound with 
bifilar wire and mentions the increased capacitance as a virtue but I 
strongly suspect he never made (maybe couldn't have made) any 
quantitative tests.  Certainly no one since has deliberately made 
coils with high self-capacitance.

Ed