Impedances in a transmission line repeat themselves
every 1/2 Wavelength. For use on a tribander, any
multiple of 1/2 WL on 40M will also be a multiple of
1/2 WL on 10, 15, and 20M. This translates to 46.6 ft
for a velocity factor of 0.66 such as in RG213.
A multiple of 1/2 WL on 80M will also be a multiple of
1/2 WL on 10, 12, 15, 17, 30 (close), 40, and 80M.
This corresponds to 93 ft for a velocity factor of 0.66
Tom N4KG
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