C. J. Clegg wrote:
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?

For a rough approximation, you can model the trap as
a stub with the same VF and Z0 as the coil. Equations
(32) and (51) in the following IEEE paper are useful
for that purpose.

http://www.ttr.com/TELSIKS2001-MASTER-1.pdf
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73, Cecil http://www.w5dxp.com