|Subject:||Re: [TowerTalk] Vertcal Dipole|
|From:||"Tower (K8RI)" <firstname.lastname@example.org>|
|Date:||Sun, 17 Oct 2004 13:05:34 -0400|
Yes, but it was quite some time ago. When using the braid for the bottom half they make a very good portable antenna that can be hung from a tree branch.
* top half of radiator, i.e., 1/2 of dipole is aI'm hearing your question a bit different than others.
This sounds like a center fed half wave with the feed coming up through the bottom half of the dipole. A common way of building one of these for higher frequencies is to strip the jacket back far enough that a 1/4 wave length of braid can be pulled back over the jacket. You have to strip the jacket back quite a bit more than a quarter wave as the braid gets a lot shorter when expanded. This also forms an open 1/4 wave stub where the coax comes out. I've never seen any decoupling used due to the configuration. Think of an Isopole (TM), but used at 20 meters and the the shield takes the place of the top cone.
* the bottom half of the dipole would be fed from the
As is this one. It's just the coax doesn't come in from the side, but rather up through the bottom 1/4 wave.
* A person could use some type of tubing for theThese used to be listed in the ARRL Handbook and the antenna hand book, but I don't find on in either of the latest ones. I haven't searched the older handbooks yet.
I look forward to your thoughts.
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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