Paul,
Another suggestion, end feed a center fed dipole. That
doesn't
make much sense, but thats because I don't know how to describe
it.
In effect, run the coax ~through~ one half of the dipole to the
center where the feed point is. One way is to double the braid
back
onto it's self. The folded back braid makes up half the dipole,
the
center conductor is the 'other' half. I'm sure there are better
descriptions and pictures somewhere, I'll see if I can find one.
'Doc

'Doc wrote in message ...
Paul,
Another suggestion, end feed a center fed dipole. That
doesn't
make much sense, but thats because I don't know how to describe
it.
In effect, run the coax ~through~ one half of the dipole to the
center where the feed point is. One way is to double the braid
back
onto it's self. The folded back braid makes up half the dipole,
the
center conductor is the 'other' half. I'm sure there are better
descriptions and pictures somewhere, I'll see if I can find one.
'Doc
Wow, that is a very interesting concept. An antenna consisting of all
coax. That would solve a lot of configuration problems, and leave the
backyard clear of obsticles other than the antenna over head. Has
anyone had experience with one of these? Although that would be quite
a bit of coax for an 80 foot run, plus lead in to the shack, but that
would solve a lot of problems. What would the coax size have to be?
Could rg-8u be used? I wil have to check the cost though. Thanks for
the suggestions.
Paul

'Doc wrote in message ...
Paul,
Another suggestion, end feed a center fed dipole. That
doesn't
make much sense, but thats because I don't know how to describe
it.
In effect, run the coax ~through~ one half of the dipole to the
center where the feed point is. One way is to double the braid
back
onto it's self. The folded back braid makes up half the dipole,
the
center conductor is the 'other' half. I'm sure there are better
descriptions and pictures somewhere, I'll see if I can find one.
'Doc
Doc, I found some info on the antenna you describe. It can found at
http://www.xs4all.nl/~pa0nhc/antenne/cobra80/cobra.htm
And the weird thing is he had the exact same problem I'm having. I
think this is the solution to my problem. Thanks
Paul
KC9EYE
Hobart, IN

Paul,
I've used one of these things when portable. Worked
better than the mobile antenna, but I did use a tuner
(wasn't all that worried about losses at the time, no
harm to the tuner).
To keep the weight/cost/bulk down I used RG-58 coax (it
was going to be wound up and thrown in the trunk). If I
were going to make it a 'permanent' (no such thing!) antenna
I might use something larger, but I doubt it.
The center 'feed point' was weather proofed by sealing it
with some kind of 'goo', can't remember what it was, probably
silicon. Also found that winding a 'choke' a few feet from
the end where it came out of the folded back braid cut down
on RFI problems. Not that they were 'bad', but it didn't
hurt anything either.
I wouldn't count on it ever being a 'DX antenna' (whatever
that means), but it is an alternative...
'Doc

It is called a coaxial antenna. It is usually used in the vertically
polarized orientation, but don't let that stop you from using it in any
other orientation.



"'Doc" wrote in message ...


Paul,
Another suggestion, end feed a center fed dipole. That
doesn't
make much sense, but thats because I don't know how to describe
it.
In effect, run the coax ~through~ one half of the dipole to the
center where the feed point is. One way is to double the braid
back
onto it's self. The folded back braid makes up half the dipole,
the
center conductor is the 'other' half. I'm sure there are better
descriptions and pictures somewhere, I'll see if I can find one.
'Doc

"'Doc" wrote in message ...


Paul,
Another suggestion, end feed a center fed dipole. That
doesn't
make much sense, but thats because I don't know how to describe
it.
In effect, run the coax ~through~ one half of the dipole to the
center where the feed point is. One way is to double the braid
back
onto it's self. The folded back braid makes up half the dipole,
the
center conductor is the 'other' half. I'm sure there are better
descriptions and pictures somewhere, I'll see if I can find one.
'Doc

That might be an original idea, a sleeve vertical mounted horizontally.

Tam/WB2TT