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

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Re. [Ten Tec] Grounds and balanced fed verticals
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 27 Jan 2012 16:44:56 +0000
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

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!

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.
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