On Sat, 11 Nov 2006 15:11:14 -0800, sailtamarack wrote:

You can design the antenna and the coils using Hamcalc.

Thanks for pointing me in that direction. That program is a goldmine!

Also thanks to everyone else for their advice.

I looked at rfparts.com for suitable capacitors for these traps
(assuming I don't go the coax trap route), and I gotta say, they sure are
proud of their capacitors ... $16+ for each 5 KV doorknob capacitor.

For a dual-band 80m/40m dipole using resonant traps, how can I figure out
the capacitor voltage rating I need for each power level?

This antenna is never going to be used over 200 watts and rarely over 100
watts, in fact it's probably going to spend most of its life around 10
watts or less (FT-817 / IC-703).