K1TTT wrote:
On Oct 18, 9:57 pm, Cecil Moore wrote:
On Oct 18, 11:04 am, Jim Lux wrote:

But, isn't that conductive sleeve itself a shorted turn?
Yes, but that particular low-loss shorted turn solves the problem that
needs solving. Nobody said it was a perfect solution.
--
73, Cecil, w5dxp.com

well, if its not the perfect solution then the problem is not
completely solved... so there must be a better solution to really
solve the problem.

one could simply slit the tube (and finger stock at top). Consider that
the lower tube is serving two purposes: mechanical support and a movable
contact on the inductor.