[TenTec] Re. [Ten Tec] Grounds and balanced fed verticals

[Steve Hunt]

Joel,

I'm giving some thought to how I would replicate your experiment to 
satisfy my own curiosity, and I have a couple of questions about the 
technique you used.

 From your article I gather that when you changed the line conditions - 
made it wet, dropped it onto the ground etc - the characteristic 
impedance changed, and that you compensated by adjusting the tuner to 
ensure that the line remained matched; however as far as I can see there 
was no corresponding change in matching at the signal generator end. 
That would mean the generator was "seeing" a different impedance for the 
differing line conditions; consequently there would be a changing source 
mismatch-loss and the generator would deliver different powers to the 
line under the different line conditions.

I'm wondering:
1) When adjusting the tuner, how did you know when the line was matched?
2) How did you take account of the changing generator mis-match loss 
when calculating the line loss?

Please don't think I'm trying to "challenge" your technique, I'm 
genuinely trying to unravel some of the issues!

Thanks,
Steve G3TXQ



On 27/01/2012 13:52, Joel Hallas wrote:
> Steve,
>
> Thanks, yes I agree that it is important to be as correct as we can. Still,
> I have confidence in our observations.
>
>