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[TowerTalk] optimum height

 To: [TowerTalk] optimum height alsopb@gloryroad.net (alsopb) Sat, 28 Jul 2001 13:15:03 +0000
 ```I queries WX0B about the rule of thumb regarding "optimum" stacking height. Here was his response: *********************************** For HF antennas over ground, W2PV did the math correctly and the formula is SQ rt of boom length is the widest stacking distance you should use on a yagi. The results are in boom lengths just as you state. Also a model should be run to verify no strange pattern lobes are created in the stack. *********************************** Note the origin was not via emperical results but is based in mathematics. The fact that one can do detailed analytical calcs that in many cases agree with this "rule of thumb" support its use as an intial point for optimization studies. Clearly the "bad lobes" one is trying to squish into desirable lobes is a function of antenna height. The variables of stack spacing an antenna phasing are the only things left to play with after the top antenna height is fixed. No doubt there optimum spacings which deviate from the rule of thumb. We are so fortunate to have tools available to do the design fine tuning. I can't imagine one spending kilobucks on a stack and not modeling them with these tools. 73 de Brian/K3KO ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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