>From the Yaesu manual
K = turning radius x (antenna + mast weight)
The mast weighs around 110lbs
So add 55 lbs to each antenna calculation. Then sum the two
They give a pretty lengthy example of this in the manual. Metric of course,
but the result is the same.
John
Wa5zup
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of K4SAV
Sent: Wednesday, March 19, 2008 5:03 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Does a M2 Orion 2800 fit in a LM354HD top section?
Are you sure you didn't get a metric number mixed in with the English
numbers? Using Yaesu's method of figuring the K factor, I get 3264
ft-lbs for the antennas you have. The G-2800DXA is rated for 6870
ft-lbs. You are at 47% of the rating.
Jerry, K4SAV
John Elsik wrote:
>I have a new LM354HDSP crankup tower. I got the tower up, back in late
November. That is where the project stopped for the winter. All it is
holding up is an inv vee for 80 mtrs right now.
>The antennas are a 4el SteppIR and a Cushcraft XM240 on a chrome moly mast.
Nothing is installed yet.
>I purchased a Yeasu 2800DXA rotor to turn it, but now having second
thoughts if the rotor will handle it long term. The "K" factor is 85% of the
published rotor rating.
>I called Yeasu and they told me to take the weight off the rotor. They
suggested adding a second plate and bearing between the rotor and tower top
bearing, and take the weight off. Sure did not come away with a warm and
fuzzy feeling that the rotor would handle the load.
>So I am taking pause and sort of rotor shopping. I realize I would take a
hit selling the Yeasu. I would rather be safe than sorry later.
>I was looking at the M2 Orion 2800 (rotor only) and a Green Heron
controller.
>Will the Orion fit in a LM354HD top section? I called Tashjian and they
could not answer that.
>
>John
>wa5zup
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