In a message dated 2/14/2005 11:48:07 PM Eastern Standard Time, wc6w@juno.com
writes:
Has anyone ever seen a multilayer approach to this portion of the coil? For
instance 3 layers spaced 1/4" apart radially.
Five turns of #8, space wound 5 TPI on each layer 1" wide at a 2.5" average
(2" - 2.5" - 3" layers) diameter would provide something in the vicinity of
17 uH. This is approximately double the inductance of the same amount of wire
wound with at the same pitch in a single layer.
It might take a bit of creativity to wind but, with a suitable form, it
could be fabricated starting with the innermost layer at the output end.
This approach would increase the interturn C somewhat but, I doubt if that
matters all that much on the "Topband".
73 & Good evening,
Marv WC6W
It might be a 'Q' Killer if you wound the layers back & forth like in a
transformer winding. It might work OK if you wound 3 layers-per-turn in a
pie-wound
coil fashion to minimize the eddy currents and capacitance between turns.
Would be interesting to wind a few variations and check each one on a Q-meter.
73
Todd WD4NGG
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