[Antennas] Fw: Toroids - what kind - turns?

[Jim Sutton]

I am planning to install a wire antenna in my attic - since Condo rules =
prevent an outside antenna. The antenna will use 12 v relays to alter =
the antenna length to accommodate various bands.  I intend to use =
standard drop cord for the 12 volts required to operate the relays.  A =
maximum of 200 watts will be the output of the transmitter.

Now the question. Since the control line for the relays will be close to =
the antenna it will of course receive a blast of RF which would then be =
seen at the rig control point,  the 12 V spower supply and who knows =
where else. It appears to me that toroids or beads would largely =
eliminate this problem.

So the question really is - what size of toroid(s)- how many turns and =
what material would be best to cover from 4 to 30 Mhz?  The same general =
questions apply to beads.

Thanks for you thoughts,

73/Jim/AC4CZ

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