[TowerTalk] VHF/UHF Common Mode Choke
xdavid at cis-broadband.com
Fri Jun 28 14:50:19 EDT 2019
I've never been much interested in VHF/UHF, but with the current level
of solar flux and the summer static I'm thinking of giving it a try
using homebrew antennas based upon DK7ZB designs. For 6m I'll probably
use a coaxial sleeve as a common mode choke (unless somebody can suggest
something better/simpler), but for 2m/70cm I'm planning to build a dual
band yagi with a common feedline and I'm not sure a sleeve would work.
I guess it might, since 1/4 wave and 3/4 wave (432/144 = 3.00)
accomplish pretty much the same thing, but I'd like some input from
VHF/UHF hams who would know better than I.
And if a sleeve balun is indeed the way to go, what is the best way to
fabricate one at UHF? As W8JI points out, coax jackets aren't
necessarily a low loss dielectric at UHF.
Thanks much for any suggestions.
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