|Subject:||[TowerTalk] Looking for NEC models and hardware ideas...|
|From:||Jim Lux <firstname.lastname@example.org>|
|Date:||Mon, 31 Jan 2005 11:57:28 -0800|
I'm working on a portable phased array demonstration, based on multiband
trapped verticals, and I'm looking for some NEC models for them
(particularly, the traps).|
I'd also welcome suggestions on how to characterize the traps by themselves, say, with a MFJ antenna analyzer (test fixtures?)
Specifically, I'm using the Hustler 6BTV, which I now have 4 of. They were selected on the basis of price, primarily, figuring that there's no huge difference in RF performance between the various versions (among Cushcraft R8, MFJ/Hygain whatevers, etc.), and they appear to break down nicely into 3 8 foot segments (which makes them "car top able"). Thanks to all who gave me feedback over the weekend to my request.
(I have to say that price was a big factor.. if the idea doesn't work, due to the vertical antennas, I'm only out $800 or so, as opposed to $2K for, e.g. R8s)
To issue of portability, I'm looking for ideas on quick connect/disconnect, other than the standard hose clamps. I realize that hose clamps which might actually work as well as anything else, especially, if you have a little collar on the "non-clamp" tube that positions the element in the right place when you slide the segments together.
The goal is to have the entire array able to be deployed/stored in 15-20 minutes, so if it takes more than, say, 5 minutes to put a single antenna up, it's too long. I think this is perfectly reasonable.. It only took me 15-20 minutes to assemble one of them from scratch out of the box and go lash it to the kid's fort in the back yard. (obviously, I didn't do any tuning in that amount of time.. just tape measure adjustment, clamp it down, and we're done)
I'm also looking for a source for inexpensive, rugged waterproof cases (like Pelican cases) to hold the antenna base tuning and monitoring components. Something 12x12x6 or thereabouts would probably do, perhaps a bit bigger. I'd like something where the lid latches positively closed (so Rubbermaid containers don't hack it), and which is structurally rugged enough to stand being lashed onto a roof rack, or (although I don't plan to do this) survive being checked as baggage. I'll probably need 5 or 6 of them (so you can see why $150 Pelican cases aren't really what I want!)
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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