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Locked Coplanar single-turn compact transmitting loops


 

Has anyone tried to build a coplanar loop - one which consisted of two
loops that shared a common feed point, but were of different
dimmensions (one built inside the other - sharing one side)?

I'm thinking about building an 8x8 copper loop for 40m, and building a
4x4 copper loop inside of it. I would tune each loop using a coax
capacitance stub (for 14060 and 7040). Is such a design possible? or
would it make things so complex having two loops together that one
would interfere with the other? It would be a similar concept to using
two dipoles off of the same feedline - except, using two tuned loops
instead.

Thanks,
Daniel / AA0NI

p.s. How many of you have used a toroid transformer to go between your
feedline and single turn compact transmitting loop? What kind and size
did you use? Iron core or Ferrite? T-50, T-114, ... ?

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