Re: [TowerTalk] SteppIR 40/30 and loading

[tongaloa <tongaloa@alltel.net>]

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?

-Bob
ah7i


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