Re: Primary coil configuration

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Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>



Hi Chris,

If you place the primary off center in a half wave coil you will find
that the performance drops quickly. ( and If you tilt the primary the
performance drops like a rock)

Solenoidal primaries work just fine. I like them better then pancake
primaries they are easier to make and tune. You can wrap tube around a
drum and get a nice copper spring. Compress the spring and the
inductance goes up. Stretch the spring and inductance goes down.

You can make spacers and spiral them into place or weave nylon rope
between the winds and epoxy saturate the rope for a rigid structure.

Sincerely: Jared Dwarshuis