[Amps] Compact Coil Concept

[wc6w at juno.com]

  The 160 meter portion, even employing a reduced diameter conductor, requires almost half the total space in a Pi-Coil.  

  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





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