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<div class="moz-cite-prefix">On 11/10/2015 08:27 AM,
<a class="moz-txt-link-abbreviated" href="mailto:matthew@mrstevens.net">matthew@mrstevens.net</a> [LakelandARC] wrote:<br>
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<p>This article is a reprint of a 1956 article that appeared
in the November 1991 QST. It might be old news to many of
you, but it was very helpful to me when I was trying to
troubleshoot some 'odd' problems with an antenna that I
had put together. All the literature that I had read while
working on the project seemed to tell me how to make the
antenna, but not to much about why it worked. This is the
one that finally made it 'click' for me...maybe you just
have to find someone to explain things to you the right
way.<br>
<br>
I think it would be great to spread the word about any
other articles or resources that any of you might have run
across and found helpful. If you have anything that you'd
like to share with the club, please let me know, email to
KK4FEM(at)arrl.net. Since we are an ARRL affiliate club,
we are able to put the full text of any QST articles (new
or old) on our website, blog, yahoo group, etc., as long
as it is properly attributed to the source.<br>
<br>
Especially for newer hams (like me) I think this would be
helpful towards the dual goals of the <br>
"<span>Continuation and extension of the amateur's proven
ability to contribute to the advancement of the radio
art</span><span>"<br>
and "</span><span><span>[Expanding] the existing
reservoir within the amateur radio service of trained
operators, technicians, and electronics experts."</span>
(Part 97.1)<br>
<br>
</span><span>Particularly the <i>electronics experts</i>
part :-)<br>
<br>
</span><span>So, please,</span> if anyone has any useful
information that you have found, just send it to me at
KK4FEM(at)arrl.net, and we will put it on the blog and in
the "files" section on the yahoo group. That way we can
all learn, and keep learning from our experiences.</p>
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<span style="color:rgb(0, 0, 0);">-- <br>
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<div><span style="color:rgb(0, 0, 0);">Matthew
Stevens<br>
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<span style="color:rgb(0, 0, 0);">KK4FEM</span></div>
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<big><big>Matthew: I don't know what math level you are at, but in a
(<b>resonate</b>) feed line, the voltages and currents (are not
in phase with each other). If you are familiar with complex
numbers, it is easier to understand. <br>
<br>
The conditions at any point in the feed line can be expressed a
R +- JX Vector number. R is the resistive component and JX is
the reactive component (a Vector Quantity) <br>
<br>
This may sound very complicated, but once you understand it, it
becomes simple and is the main tool for all antenna impedance
matching calculations. <br>
<br>
Every transmission line has a characteristic impedance
(determined by the spacing and the material (air or plastic)
separating the wires. When the impedance's are perfectly
matched, the feed line becomes resistive only regardless of the
length. ie Maximum power transfer. <br>
<br>
To conclude, If you matching is <b>correct</b>, you have a <b>non-resonate
(flat)</b> line that appears resistive, and It make no
difference how long you feed line is.<br>
<br>
If your matching is <big>in-correct,</big> your feed line
becomes part of the radiating antenna, and the length is
extremely critical. <br>
<br>
Don KI4EFL<br>
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