[TowerTalk] Double Coax Runs to Reduce Loss

[Jim Brown]

On Fri,12/23/2016 5:54 AM, Patrick Greenlee wrote:
> It might be interesting to put a watt meter first at one end of the 
> DIY twisted pair and then at the other end and see what the efficiency is.

I also do not buy Guy's premise. But the way to confirm it,whether the 
line is parallel or twisted,would be to first build a length of it, 
measure it with a good vector analzyer from one end with the other end 
open and again with it shorted, then export that data to AC6LA's 
excellent ZPlots Excel spreadsheet, which will compute loss vs frequency 
and plot it. It will also compute Zo and VF vs frequency and plot it.

Then expose  the line to the elements for as long as you think is 
necessary for degradation to occur, then take it down and repeat the 
measurement.

The vector analyzer data, post-processed by ZPlots, is FAR more precise 
than a Bird. The AIM, SARK, N2PK, and VNWA units can provide very good 
data for this use.

73, Jim K9YC