[TowerTalk] Rotator capacity clarification

[Pete Smith]

You're both right.  Yaesu wants you to multiply the weight of antennas and 
mast by the turning radius of the array and add that to the total 
K-factor.  All that amounts to is a pseudo-scientific way of getting you to 
be really conservative in which rotator you choose.  Including the weight 
of the array in a calculation involving the turning radius of the 
array  has no basis in physics.  The *real* specs are further back in the 
manual.

73, Pete

At 08:33 PM 4/6/2008, wa5zup wrote:
>Not according to Yaesu.
>I called them and verified this.
>The mast weight is included in the Yaesu K-Factor calculation.
>It is in the user manual for the G-800DXA/G-1000DXA/G-2800DXA series (page
>5).
>They told me, for the antenna system I was considering, to take the
>antenna/mast weight load off the rotor.
>The K-Factor is Yaesu's formula for Yaesu rotors only.
>John
>Waa5zup
>
>-----Original Message-----
>From: towertalk-bounces at contesting.com
>[mailto:towertalk-bounces at contesting.com] On Behalf Of K7LXC at aol.com
>Sent: Sunday, April 06, 2008 6:00 PM
>To: towertalk at contesting.com
>Subject: [TowerTalk] Rotator capacity clarification
>
>Howdy, TowerTalkians --
>
>     There was a recent rotator discussion where a  poster determined the
>loading that included a mast. The relative formula (weight  times turning
>radius)
>gives Effective Moment (Hy-Gain) or K-Factor (Yaesu). This  is a much better
>
>way to look at it than the old square footage estimates but  even this is an
>
>estimate. An educated one, but an estimate nonetheless.
>
>     Throwing in the weight of the mast threw the  numbers off significantly.
>
>When it comes to rotator capacity, the mast is a  non-issue. You don't add
>the
>mast weight in - just the antenna  figures.
>
>     There's no problem including the mast. (weight  80#  times turning
>radius
>of 1" = 13.3 foot/lbs) The mast has no effect on  the rotator capacity.
>
>Cheers,
>Steve      K7LXC
>TOWER TECH -
>Professional tower services for hams
>Cell: 206-890-4188
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>
>
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