|Subject:||Re: [TowerTalk] Modelling a basic stack|
|From:||Bill Tippett <firstname.lastname@example.org>|
|Date:||Sun, 09 May 2004 22:51:20 -0400|
>I'd appreciate being guided to some good references regarding stacking before
I get in too deep :~)
Bert, I would first use YO7 to optimize the antennas in their free space stacked configuration. YO7 already has the A50-5S in the database so it is simply a matter of selecting it and the stacking distance you want to try. YO7 is still available and is supported by K6STI. Brian can be reached at bbACn2.net where AC is the new Morse symbol for @.
Once you've optimized the F/R, Gain and SWR performance as a stack, you can then use N6BV's HFTA program included in ARRL's 20th edition of the Antenna Handbook to model different stacking heights over your actual terrain.
Here is a sample YO7 output showing before and after results for two stacked KLM 610's:
In my case YO7 gave me ~1 dB more gain, ~8 dB more F/R and better SWR bandwidth from 28.0-28.8 MHz.
...and here is a sample of what HFTA will show:
YO7 is a phenomenal program and the best $100 you will ever spend on any Yagi modeling program!
73, Bill W4ZV
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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