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Re: [TowerTalk] Reference plane for FCC power limit

To: Chuck Counselman <ccc@space.mit.edu>
Subject: Re: [TowerTalk] Reference plane for FCC power limit
From: Bill Turner <wrt@dslextreme.com>
Reply-to: wrt@dslextreme.com
Date: Wed, 03 Sep 2003 11:38:15 -0700
List-post: <mailto:towertalk@contesting.com>
On Wed, 3 Sep 2003 13:05:56 -0400, Chuck Counselman
<ccc@space.mit.edu> wrote:

>The FCC is (also) silent regarding _what_ power is limited.
>
>The "forward" power at a reference plane/point along a simple TEM 
>transmission-line such as coaxial cable or parallel-wire line depends 
>not only on the voltage across and the current through the line at 
>said plane, but also on an assumed value, e.g., 50 ohms, of the 
>characteristic impedance Zo of said line.

I've read that statement a half dozen times and it still makes no
sense.  The Zo determines the ratio of E/I, but for a given power
level, Zo has no effect on E*I.  (Assuming the theoretical lossless
line for discussion purposes, of course).  Where am I wrong?

-- 
Bill, W7TI


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