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Re: Practical limit to number of turns on primary ? ? ?



Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Seems to me that the number of turns in the primary is just that
required to tune it to the frequency of the secondary.  The spark length
is a function of the energy stored in the primary capacitor.  For a
given voltage lots of energy means a large capacitor and hence less
turns for the primary coil.  In the "good old spark days"  hams had a
problem getting their frequency up to the required 1500 kHz (200 meters
wavelength) with a practical SINGLE TURN primary coil, so went to as
high a voltage as they could afford in order to minimize the capacitance
and make the primary coil more convenient.  Of course, many didn't do
that and operated on a longer than legal wavelength.................

Ed