[TowerTalk] Rotator capacity clarification

[wa5zup]

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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