Really is nice to see HFTA suggestions
For a project to put two 20M5 in a stack, I was told by several friends to put
them at 69/138 ft
HFTA show that this is not the best height and they must be not to high, 59/118
seems to be better
Anyway the practice show me that high antennas are good:-)
Most of the people told me that a 10 mts antenna at 200 ft hight will not work,
but really this antenna pay off all the work
So now, about the 20 mts stack project, I am in doubt if I need a 118 or 138 ft
tower, not sure what to do :-(
73,
Jorge
CX6VM/CW5W
Enviado desde mi iPhone
> El 18/06/2014, a las 08:31, Bill via TowerTalk <towertalk@contesting.com>
> escribió:
>
> In the past N6BV has been kind enough to supply me the "numbers" for my
> QTH using his wizardry to generate them in a few minutes and then ship me
> the
> files.
>
> His files went up to about 14000 feet, and his reasoning was beyond that
> the effects are minimal. I would imagine this is true except in extreme
> cases.
>
> I strongly recommend EVERYONE who is contemplating putting up a tower
> (except those who live on a table top terrain) do the HFTA thing.
>
> Even here in fairly flat FL, where my dropoff to the NE is about 95 feet
> over a 1000 ft distance, the difference in takeoff angle compared to flat
> ground is significant. My terrain at KH6 was such that it precluded me
> from
> putting up tribanders higher than around 90-95 feet, even though they were
> mounted on a 150 foot tower. Who would have guessed anything higher than
> 95 feet would not have worked as well on 20 on an 8000 mile path to EU?
> Thanks to HFTA, I knew.
>
> I have used Dean's program on both of my stations and if the time ever
> comes to build another, I'll do it again.
>
> Bill K4XS/KH7XS
>
>
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