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## Re: [TowerTalk] Elevated vertical

 To: Re: [TowerTalk] Elevated vertical "Paul Christensen" Sun, 25 Dec 2011 21:38:22 -0500 mailto:towertalk@contesting.com>
 ```> If the antenna is 50 ohms X= 0 then regardless of line length > the it should show 50 ohms at any length. Yes, if the characteristic Z of the line is 50 ohms. Not true for lines of other characteristic Z terminated into that antenna. > Only with a reactive load should a line make the impedance different at > the source. True when a non-reactive load value equals the characteristic Z value of the line. How about an antenna feed-point of 100+j0 (non-reactive) connected to a quarter-wave of loss-less line with a characteristic Z of 50-ohms? In that case, the line input Z is 25+j0 (i.e., one-quarter of the antenna Z). Add another quarter-wave of line (half-wave total) and we'll have 100+j0 at the line input -- the same Z as the antenna input. Paul, W9AC _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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