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Re: [TenTec] OT SWR VS Power Loss

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] OT SWR VS Power Loss
From: "Alfred Lorona" <w6wqc@dslextreme.com>
Reply-to: Alfred Lorona <w6wqc@dslextreme.com>, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Mon, 7 Jul 2008 14:52:10 -0700
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Zero reactance in a wire antenna feedpoint is a necessary but not sufficient 
condition for it to be truly resonant. Citing the Antenna Fundamentals, chap 
2, page 2-1 of my 16th addition of The ARRL Antenna Book, a resonant wire is 
defined as 'The shortest length of wire that resonates at a given frequency 
is one just long enough to permit an electrical charge to travel from one 
end to the other and back in the time of one RF cycle.'

Clearly, a short wire with a finite pure resistive radiation impedance is 
too short physically for the required condition to exist as stated in the 
Handbook definition..

On the other hand, elsewhere in the book, a zero reactance 'resonant' 
condition does not mention the required physical length of the wire. If this 
is all that is required, ANY wire can be called resonant and there is 
nothing to distinguish such wires from a halfwave wire. Somehow this doesn't 
sit right with me. What do you think? Do you think that this discrepency 
begs for a minor clarifying rewrite?

73, AL 

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