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Re: [TenTec] OT: SWR & Coax

To: tentec@contesting.com
Subject: Re: [TenTec] OT: SWR & Coax
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Reply-to: geraldj@storm.weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 07 Jul 2008 10:50:12 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Mon, 2008-07-07 at 15:39 +0800, Marinus Loewensteijn wrote:
> When Coax is terminated at the transmitter end and the far end with an 
> impedance that is equal to its defined impedance we will have a SWR of 1:1.
> Only when the currents on inner conductor and on shield are equal and the 
> current / voltage nodes coincide at the same locations then they'll cancel 
> radiation.
> If we have anything else that creates a SWR that is not 1:1 then waves will 
> be reflected from the ends.  Hence no longer will the current and voltage 
> nodes be coinciding.

So long as the shield is intact, it matters not whether the nodes match,
there is current only on the inside of the shield and that can't
> When nodes are no longer coinciding then we will have radiation.
> What is wrong about this, what am I missing here?

You are forgetting that the coax is shielded and that limits radiation.

> Thanks, 73, marinus, ZL2ML

73, Jerry, K0CQ

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