[TowerTalk] ridge top derating factors

[Eric Gustafson]

Hi John,

I have a photograph that I took at one of our customer's mines in
South Africa.  They have a smelter with three smoke stacks.  Each
stack is about 50 to 75 feet taller than the next smaller one.
the picture clearly shows the smoke streams going out in an
almost perfect 120 degree spoke pattern away from the smelter
(for miles).  We were there for about 5 weeks and the smoke
pattern was as described above more than 50 % of the time.

73, Eric  N7CL

>From: "John Langdon" <jlangdon@outer.net>
>Date: Thu, 13 Apr 2000 15:13:51 -0500
>
>Just an unscientific observation, but I am on a not very high
>ridge, but I have seen the antennas on the tower (at various
>heights up to 195') deflecting in two different directions from
>each other and both different from what the prevailing winds
>were on the ground, and I have also started up the tower in
>relative calm at the ground level and decided not to work
>because the winds were too much at 90', and found it still calm
>when I got back down to the base of the tower again. Never
>boring!
>
>73 John N5CQ
>

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