If your mind is set on coax traps, ok, but you might consider
something different. W9INN uses what he calls a "resonactor" in his
trap dipoles and I think they are far better. Basically, they are just
a single layer coil which is carefully trimmed to resonate at the
desired frequency with its own self-capacitance. There is no other
capacitance needed. The advantages are two: Very low loss and very
high power handling capability. I have run 1500 watts of RTTY under
contest conditions for years into mine with no problems at all.
Conventional traps, whether L/C or coax would probably have given
problems my now with that power level and type of operation.

You do need a grid dip meter to tweak them, but that is true of other
traps too.

W9INN is now an SK, but his ideas live on.

Bill, W6WRT


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On Sat, 11 Nov 2006 14:24:04 -0500, "C. J. Clegg"
wrote:

Anybody know where I can find some formulas or design information for
designing coax traps for a dipole?