[TowerTalk] SteppIR 40/30 and loading

[david jordan]

Hi,

My recommendation wasn't regarding linear loaded elements.  It was a 
drooping element design. Half wave dipole elements, from the center 
insulator outward the element is 1/8 wave horizontal and 1/8 wave 
vertical.  Invision a half sized quad element fed at the center. This 
configuration isn't linear loading where the element is folded back upon 
itself.

Model that one for me Yuri,
dave
wa3gin

K3BU at aol.com wrote:

>In a message dated 11/5/03 10:16:22 AM Eastern Standard Time, 
>wa3gin at erols.com writes:
>  
>
>>>>No.  A properly designed lumped inductance is better than linear
>>>>        
>>>>
>>loading.  That's why many 80 meter Yagi owners have upgraded to
>>W6ANR's aftermarket loading inductors, replacing the original linear
>>loading.  Linear loading is a marketing concept to make you think
>>you have eliminated the ohmic losses associated with loading 
>>coils.  Instead, it *increases* the losses.  
>>
>>Rick N6RK
>><<
>>    
>>
>
>
>Amen and Ditto!
>
>For those interested and willing to immerse in the "war" about the Current 
>Distribution in Antenna Loading Coils, significance on the efficiency of 
>antennas, problems with understanding and modeling vs. reality see my article and 
>some comments at
>http://www.k3bu.us/loadingcoils.htm
>
>The arguments are flying at the Newsgroup
>rec.radio.amateur.antenna
>in the thread
>"Current in antenna loading coil controversy"
>
>Original articles that started the "war" were on eHam.net by K0BG
>
>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.
>
>I don't want to start another war here, rather point to what was already 
>rehashed and with W9UCW and W5DXP we will prepare concise article on the subject, 
>put it on web site and submit to ARRL/QST publications (19th edition of ARRL 
>Antenna Book has it wrong)
>
>Yuri, K3BU.us
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