| > A rotary joint shouldn't be a big deal for HF.  We use a variety of N
> connector rotary joints on the antenna range at JPL, and they are fairly
> wide band.  I would imagine you could find one surplus.
You would need at least a coax and rotor cable to go through
this joint.  My long range plan is to have a stack, requiring
multiple coax and rotor cables.  This would be quite non
trivial to build a rotary joint for.  Not impossible, but a
big project.
Rick N6RK
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See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.
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