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[TowerTalk] B & W antenna

To: <towertalk@contesting.com>
Subject: [TowerTalk] B & W antenna
From: "Mel Martin" <ve2dc@rac.ca>
Date: Tue, 21 Oct 2003 13:23:27 -0400
List-post: <mailto:towertalk@contesting.com>
>"The termination only dissipates energy that otherwise did not get radiated
out of the antenna due to impedance mismatch and radiator inefficiency. In
other words, if the SWR was 1:1 and the antenna wire was a perfect
radiator, the termination would dissipate 0 watts."

Now that is creative!... the antenna is NOT resonant at most frequencies, so
the termination device DOES dissipate a great deal of energy at most
frequencies... even at resonance, significant power is lost regardless of
radiation efficiency since the source impedance of a folded dipole is around
150 ohms. What the above is implying is that it won't be a worse antenna
than it would be without the dissipative load, which is probably true. It
still doesn't make a good amateur antenna where we try to work long distance
on relatively low power. It has it's uses, as some pointed out... but
realize it can be as much as a couple of S-units below a resonant dipole.
The application being discussed is for 2 frequencies, so there are much
better choices if maximum signal for the least dollars is a consideration.



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