[UK-CONTEST] Long Distance Feedlines

[Chris Tran]

Hi Adrian et al

The set-up you describe is used at ZL6QH - see www.zl6qh.com    The 
open-wire feeders are approximately 400 ohm - 12-14swg wire space about 12 
inches apart - at the TX end there are 1:9 baluns fed with RG213 from the 
shack, but at the antenna end the open-wire feedline is connected directly 
to the antenna.  Even the 2 x 10m, 1 x 15m and 1 x 20m yagis are fed in this 
way, because they are fixed yagis so there are no mechanical rotation 
considerations with open-wire feed. I think the 1:9 ferrite baluns are 
described somewhere on the ZL6QH website.

This system seems reasonably efficient - there are no coax-fed reference 
antennas to do any real comparisons, but results are good. The open-wire 
feedlines are anywhere between 10 and 15 feet above ground - the longest run 
is about 300m similar to your proposed set-up.

I would think that your main considerations will be the mechanical mounting 
of the feedlines - you need about 15-20 old telephone poles, complete with 
insulators !

73
Chris
GM3WOJ