|Subject:||Re: [TowerTalk] SteppIR 40/30 and loading|
|Date:||Wed, 05 Nov 2003 12:45:54 -0500|
K3BU@aol.com wrote: |
The importance of this phenomena is that efficiency of loaded or shortened antennas is roughly proportional to the area under the current distribution curve along the element. Loading stubs or coils "eat" the portion of the current curve and reduce the area/effciency. Top loading (T or L) "eats" just the tip of the current curve, least area. T loading cancels out the "other" polarization, L loading radiates it. The best application is in Moxon Rectangle, where it provides also element coupling and fantastic F/B for two element antenna. The current distribution in the loading coils has significant effect on the design of loaded multielement beams, software so far cannot "stomach" it. ON4UN's Low Band DXing has it right.Yuri-
Interesting charts, but in the real world wouldn't one be comparing antennas to which equal
power is delivered rather than antennas with equal currents at the current maximum?
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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