[TowerTalk] Tower height

[john at kk9a.com]

There is no simple answer, the best height for 40m is not the best height
for 10m and the propagation angle varies with the sunspot cycle and time of
day.  You should consider adding a second phased DB18 halfway up the tower
if you install a 80-90' tower.

John KK9A  


To:	<towertalk at contesting.com>
Subject:	[TowerTalk] Tower height
From:	"Mel Ming " <teammel at gmail.com>
Date:	Sun, 17 May 2015 15:21:58 -0700

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