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Old November 18th 04, 09:50 AM
Bob Bob
 
Posts: n/a
Default 5/8 over 5/8 over 5/8.. On 2m - Looking for ideas

Hi All

I will be moving to a house early next year that has 90ft trees
scattered around the backyard. Rather than setup a tower (initially
anyway) I am looking at hanging a wire (1/2" braid) 2 metre collinear
for a rope between the trees and feeding it from the bottom end.

Firstly talking about phasing sections. Has anyone come accross the
maths/size of using a single turn of stiff wire (looks like a ring
match) to go between the elements? Was thinking a short length of PVC
pipe with dowel or fibreglass spacers. How big?

What is the general figure of merit for shortening the topmost element
by when joined to a (say) PVC insulator.

And feeding. Was thinking about the J pole type match - The two parallel
wires 1/4 wavelenth long and a direct coax feed a few inches from the
bottom. Are there any better end/voltage fed methods?

Any thoughts or other construction methods/ideas appreciated.

Cheers Bob VK2YQA