[TowerTalk] Stacked Yagis

[Bill Fisher, W4AN]

>I forgot to tell you that I have a single KT-34a that is on an 89 foot
>self-supporting crank up tower.  I have at times put in a coax switch that
>allows A/B testing.  When I am working a European pileup in the middle of an
>opening, I will typically see about 10 dB in favor of the stack.  When the
band
>is just starting to open or close, I will see as much as 30 dB difference in
>both rcv and tx.  That is due entirely to the very low angle  which is
similar
>to a single yagi on a very high hill like you mentioned.

Very interesting Mike.  

So far at my place I have not seen such dramatic differences between a
single yagi at any height as compared with any other antenna or stack of
antennas.  My station is located on a very steep hilltop, and this is
probably the reason I don't see the differnce.  In Terrain Analyzer, I can
take a 40 meter beam anywhere from 60' to 120' and see very little
difference in the forward lobe produced.  W6NL (W6QHS) asked me the other
day if I thought my stacks were worthwhile on the hilltop.  Mostly, I think
they make very little difference.  I think Dave already knew this... he has
no stacks.... he is VERY loud.  


73

Bill - W4AN - K4AAA


Bill Fisher, W4AN (EX KM9P)
http://www.contesting.com 






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