[TowerTalk] Non-vertical stacking question

Bill VanAlstyne w5wvo at cybermesa.net
Tue Jul 6 11:28:53 EDT 2004


I want to run a "stack" of two 6el 6M yagis, one at 60 ft and one at 30 ft.
Using a StackMatch to switch A/B/A+B, I can cover all radiation elevation
angles between 3 degrees and 15 degrees within about 3 dB, according to my
YT model.

Problem is, I don't have a suitable tower setup to accomplish this with a
single rotator. I'm wondering if I can get away with using two separate
supports, displaced horizontally by perhaps 30 or 40 feet -- one yagi on top
of a 55 ft crank-up tower at 60 ft, the other on top of a roof mast at 30
ft. I would then synchronize the Yaesu rotators in some way. Haven't really
thought about that yet, but it's probably not difficult.

Though I can't model this configuration with YT, it seems like it might
produce gain results in the A+B mode similar to having them stacked one
above the other (~2 dB according to my YT model). But what about the
radiation angle? Would I still get the same take-off angle characteristics
of a vertical stack?

Bill / W5WVO
Albuquerque, NM


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