Hello Ed,
Lots of brain trust here to help you. To tailor a good answer, some
questons:
1. What kind of operating targets do you want?
Local? Stateside? DX? Europe? Asia?
2. How high above ground are your tree supports?
3. What is the intervening terrain/terrain cover like?
4. Any favorite bands?
5. How hard is it to get to supports, for maintenance/repair of breakages
due to motion/chafing of trees, etc? If difficult or impossible to do
regular repairs, then rigorous work will be needed to accomodate
chafing/fatigue due to tree motion.
A very long wire, and supports spanning, say, 1000 ft needs quite a bit of
tension to keep a reasonable ground clearance in the middle, probably more
than a copper wire can handle.
Unless you are lucky, and spanning a deep canyon.. If so,
then a copper coated steel wire would be the next step, and can take quite a
bit more pull (figure though, only using 10 percent or so of breaking
strength of the wire used. Even copperweld would have to be beefy, multi
strand to handle a full 1000 ft span.
Do a google search using " Copper Wire Sag Table" or similar to get some
real numbers...
Good Luck...
Pat, AA6EG aa6eg@hotmail.com
>From: Edward Sylvester <navydude1962@yahoo.com>
>To: TowerTalk@contesting.com
>CC: Paul <marinesvcs@earthlink.net>
>Subject: [TowerTalk] Need Advice on Long Wire Antenna Materials
>Date: Sun, 15 Oct 2006 21:23:29 -0700 (PDT)
>
>Though not directly pertinent to towers, I thought this would be a good
>group to poll for wire advice. My friend and I are trying to optimally
>utilize some very tall cedar pines on his 5 acre property.
>
> We've decided that a Long Wire is best, for now.....The spance between
>the two support trees is ~1000 feet. What kind of wire would you use for
>this application, keeping in mind the continuous swaying of the trees, the
>distance, the elements, etc?
>
> We only wanna have to do this once, so all solemn advice will be taken
>seriously!
>
> Thanks and 73,
> Ed NI6S
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