[TowerTalk] Latteral load capability of T2X in mast mounted configuration

Steve Jones n6sj at earthlink.net
Fri Jul 21 15:59:25 EDT 2017


When you tilt the tower over, would you be near an overhead support like a
tall structure or tree?  

If so, perhaps you could use a block & tackle attached to the tree (or
structure) to take the weight of the antenna while you tilt over the tower,
and support it while it's in the horizontal position.


-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jeff
Sent: Friday, July 21, 2017 9:47 AM
To: towertalk at contesting.com
Subject: [TowerTalk] Latteral load capability of T2X in mast mounted

I am using a mobile crank-up / tilt tower for some antenna testing that has
a top section too small to get a ham4 rotor in.  Unfortunately that means I
need to mount the rotor on a pole that extends from the top of the tower.  

The good thing about this setup is the tower nests and the tilts down
essentially parallel to the ground, allowing you to mount the antenna while
standing on the ground.  The bad thing about that setup is the rotor has got
to be stout enough to hold the antenna weight while the rotor is temporarily

I have used a ham4 in the past but that was with antennas which were pretty
light weight (under 75 lbs).  This time the antennas will be somewhat more
heavy - up to about 200 lbs - and I have a tailtwister available.  

Would the tailtwister would be happy holding that much weight off the nose
when it's temporarily horizontal?

Higain says the load capacity for a mast mounted configuration is half of a
inside-tower-mount case but I have no idea if that is applicable in the case
of the rotor being mounted horizontally.  Seems like it would because the
rotor is going to feel a lot of torque in the externally mounted case with
serious wind.  

In my case wind is not an issue.  I don't leave the antenna on the tower
when I'm not testing it.  So the only question is how the tailtwister would
do with a couple hundred pounds pulling down on the top when the tower is
tilted over?

Appreciate any comments or insights.  



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