In a message dated 11/8/02 7:19:46 PM Pacific Standard Time,
sunset392@cox.net writes:
> I will be installing a US Tower TX-489 and planning to install the following
> antennas
>
>
> 1. New KLM 10-30-7 LPA 1' above the tower (30' Boom & 8.25 sq ft)
> 2. Hy-gain Discoverer 7-2 40 Meter 2-element Beam ( 22.6' Boom & 6.0 sq
ft)
> above that
> 3. Diamond 500HNA 144/440 vertical (17.8') on top
>
>
> I have a 6061-T6 2" x 24' aluminum mast and my question is what spacing is
> needed to insure no interaction between antennas and should the beams be
> rotated 90 degrees to each other or could I keep them in the same
> orientation.
Okay, let's get a little more basic. What's your county windspeed rating?
If you don't know, you can look it up at <A
HREF="http://www.championradio.com";>www.championradio.com</A> under Tech
Notes.
I suspect that your aluminum mast (35,000 psi yield strength) isn't up to
the task. For example at 70 MPH with a ten-foot spacing between the LP at the
bottom and the 40M 10 feet up needs a mast with 50,000 psi yield strength.
Cheers,
Steve K7LXC
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