|To:||firstname.lastname@example.org, "Towertalk" <email@example.com>|
|Subject:||Re: [TowerTalk] collapsing steppIR elements|
|From:||Jim Lux <firstname.lastname@example.org>|
|Date:||Fri, 07 May 2004 11:36:19 -0700|
At 04:19 PM 5/7/2004 +0000, Jim Jarvis wrote:|
Interesting idea, to attach the tape to the tips of the nesting fiberglass tubes. Couple of problems with that, though.
What's the performance impact of using tape vs just running a wire? Sure, the RF resistance of a flat conductor is lower, but compare that to several parallel wires?
Once one has separated the "actuator" from the "conductor" there's lots of approaches. If one had telescoping tubes (with rudimentary seals, one could use air pressure to extend and retract them (assuming you can keep them clean enough), you could have a simple wire(s) fed from a springloaded spool.
There are a number of clever structures that deploy by twisting one part relative to another. Not all of them are as complex as, e.g., the 60 meter mast on the Shuttle Radar Topographic Mission.
There's also the accordion folding thing like used to hold a shaving mirror out from a wall: a series of links in X's. (imagine a stack of automotive scissor jacks) You drive the center X with a lead screw and all the rest follow. It's self balancing, but might be quite heavy.
There's also deployable structures like the Hoberman sphere and some of Snelson's tensegrity structures.
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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