[TowerTalk] 55G for 21 SQ foot Antenna?

[Stan or Patricia Griffiths]

Hi Mike,

I tried to stir up some interest on this reflector some time ago about those
confusing ratings for Rohn 55 and other tower typs as well.  Nobody seemed
interested at the time . . .   Those huge ratings are on towers that are used
in the TVRO application (TV Receive Only).  This means they are intended to
hold up lots of little TV antennas and/or dish antennas.  There is absolutely
NOTHING said about typical ham antennas or any antenna with any significant
boom length in the "MS" section of the Rohn catalog.

But to answer your real question which is how can you really find out what this
tower will support, the answer is still the same as it has always been . . .
hire a PE (Professional Engineer)  to calculate it for you.

Stan
w7ni@teleport.com

Michael Rauh wrote:

> I want to support a 21 square foot antenna load at a heigth of 160 feet.
> The Rohn catalog says 55G is good for 14 square feet for 70 MPH wind speed
> at 160 feet or 16 square feet at 100 feet.  But look on page MS-66, where
> Rohn says an 80 foot 55G tower is good for 94 square feet!  From 80 feet to
> 100 feet we lose 78 square feet?  What is going on with these ratings?  How
> can I find out what 55G is really able to handle?
>
> Mike Rauh, NV7X
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