
08-28-2009, 06:33 PM
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| Crotchety Old Bastard | | Join Date: Apr 2005 Location: Oklahoma
Posts: 5,254
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A 'sleeve' dipole is about as simple as it gets. Remove the outer insulation from about 9 feet of coax. Sort of push the braid down and over it's self (turn it inside out) until there's about 9 feet of it down the coax from where the center conductor and insulation extends above it. So you end up with the coax feed line running up through one 'side' of the dipole to the center, where the center conductor and insulation make the other half of that dipole. Sort of like;
---////-======o................ (Great graphics, huh?)
That "---" is the coax, the "////" is the coaxial choke, the "o" the center of the dipole, and the "............" the center conductor.
That 'about 9 feet long' on each side of center is too long, but allows some 'extra' for making a loop to hang the thing from, and you trim the rest to the right length like normal. Keep both sides the same length. A good thing to do is seal that place where the braid turns back from the center conductor, don't want water getting in there. figure about 18 feet of coax as the minimum length required. A PL-259 on the end of it, a double female and then the feed line to where ever it's going. That doesn't include the choke, just wind it in the feed line.
- 'Doc
(Just hang the flag from the PVC containing the antenna.) |