OK, I made my 10m dipole. I chose 7/8 aluminum angle for its light weight
and used aluminum rivets to fasten the angle to the fiberglass backing
plate.
It is a 1/4 wavelength antenna tuned for 28.450, I do not need a tuner at
all at this frequency but it will tune all of 10m with a tuner.
here is a few pics of it and my tower.
Thanks again
KI4ILB
kilo
inda
four
I
love
beer
hi hi
http://carpetcareservices.homestead.com/KI4ILBTower.html
----- Original Message -----
From: "Mark ." <n1lo@hotmail.com>
To: <towertalk@contesting.com>
Sent: Wednesday, November 30, 2005 11:24 AM
Subject: Re: [TowerTalk] 10m question - rotatable dipole
> Hello Merlin,
>
> Your idea will work Fine Business as others have already mentioned, and
yes
> it is a great project to get into building, as there's very little to go
> wrong. This method is frequently done with the ever popular Lakeview
> Hamstick antennas and clones.
>
> A friend of mine demonstrated one of these to me this past summer using 2
> 40m mobile Hamstick clones, oriented horizontally, over ground near salty
> water, and up only 10 ft. This antenna is only 16ft long, compared to a
> full-size 40m dipole at 66 ft. I was skeptical! Damned if signal reports
> from the same station weren't within 1 S unit or less compared to an 80
> delta loop up 20 ft at the same location!
>
> He used a coaxial choke balun at the feedpoint and rotated the dipole to
aim
> at the station we were working. It's a little trickier tuning loaded
> antennas as a dipole. First you must tune by adjusting only 1 antenna at a
> time for the best resonance and best SWR. Once they are matched, then you
> tune both Hamsticks together by adjusting the whips equal amounts on BOTH
> sides to center the resonance on your desired frequency.
>
> See Lakeview's dipole adapter at: http://www.hamstick.com/901.htm
>
> Also, a more developed version and parts at: http://www.buddipole.com
>
> The only rub is brewing your own mechanical arrangement, if you prefer to
> build it all, to be strong enough, depending on your intended use.
>
> See this article at LB Cebik's excellent site:
> http://www.cebik.com/wire/1712.html
> This shows some mechanical construction ideas to help get you started.
>
> The stainless whips will be expensive, unless you already have them.
> Galvanized EMT conduit will work quite well, is cheap, and available just
> down the road at the home store. Being larger in diameter than the whips,
> the resulting antenna will have a bit more bandwidth. The larger the dia,
> the more of the 10m you can cover with good resonance.
>
> The whips will probably stand up better to ice and wind, if you plan to
> mount the antenna on a tower. Some droop won't matter at all.
>
> Stainless whips are hard to trim. One trick is to file a notch using a
> triangular file, then snap the whip apart. Then you must file or grind the
> end back to a rounded shape. If you cut them too short, don't worry. You
can
> attach a 6" wire tuning stub to each end using a ground lug connector, and
> trim the wire to resonate the antenna.
>
> Happy building!
>
> --...MARK_N1LO...--
>
>
> Merlin asks:
>
> <<is there any reason why you could not use 2- 102" CB whip antennas for a
> 10M dipole?
> Connect the shield of the coax to one and the center of the coax to the
> other one using a homemade bracket out of something non conductive to bolt
> the 2 whip antennas to,at 180 degrees from each other...like this
<---------
> ----------> ...snip>>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
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>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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