Mel, Have a look at these two links. While Steve has formulated the information
strictly for hex beams the general principles involved are the same and you can
get an idea of the factors involved.Hexbeam height (1)
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| Hexbeam height (1)Describes the variation of Hexbeam performance with height |
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| View on www.karinya.net | Preview by Yahoo |
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Hexbeam height (2)
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| Hexbeam height (2)Describes the variation of Hexbeam performance with height |
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| View on www.karinya.net | Preview by Yahoo |
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73,
David, AA9G
ex W5DCG and KC9EEV
From: Mel Ming <teammel@gmail.com>
To: towertalk@contesting.com
Sent: Sunday, May 17, 2015 6:21 PM
Subject: [TowerTalk] Tower height
I realize this will seem like a dumb questions, but I am trying to make the
best choices, so I will ask.
I am retiring and moving to a new QTH near Spokane, WA. I have purchased 5
acres. I have a SteppIR DB18 antenna which I used at my previous location
and very much like. I have purchased 90' of Rohn 45 tower (previously had
40' of Rohn 25) to use for installing my antenna.
My assumption has generally been, the higher the better, but I have wondered
if there a good way to verify how high (up to 90') would be the best for DX?
Things I think factor in:
* I am on the top of a plateau and have unobstructed views in all
directions
* My soil is very rocky and slightly uneven (elevation changes about
20' over property) with tower at the highest point
* It will be a guyed tower
* The tower will be about 250' from power lines
What would be a good way for me to decide which would be best: 70'? 80'? or
use the full tower 90'? (I will not go above 90')
Thanks
Mel
N7GCO
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