[TowerTalk] Stacked Yagis

[Mike Lamb]

Interesting Bill,  I am out in the middle of a valley at 5050 ft. elevation.  It
does drop off about 400 feet toward Europe in about a 2 to 3 mile distance and it
is flat for about 3 miles toward Long Path until it goes up several hundred
feet.  I am on a ridge that drops off about 100 to 200 feet over a distance of
about 500 feet toward SA and Asia.  I have noticed that Jim, K6SX is another one
that has a tremendous drop off toward Europe and also gets out exceedingly well
with a single 204BA.

This is an interesting thread!

73/Mike

Bill Fisher, W4AN wrote:

> >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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