[TowerTalk] aluminum mast vs. tramming

[Chuck Dietz]

Put up a temporary steel mast or ginpole clamped to a tower leg at the top
and tram with it. You will still need to back guy if there is much of an
angle involved.  I would not risk the mast.

Chuck W5PR

On Sun, Mar 13, 2016 at 5:16 AM, Stan Stockton <wa5rtg at gmail.com> wrote:

> Steve,
>
> If you want to tram the antenna, in this case I would consider moving the
> top set of guy wires about 5-8 feet lower than where they are now and
> tighten them as if that's where they are supposed to be attached.  Tram the
> antenna to the tower instead of involving the mast and then move it up onto
> the mast.  Move the guy wires back up to where they were originally.
>
> You may want to remove all the elements that are within easy reach from
> top of tower and put them back on once the antenna is in place.
>
> 73... Stan, K5GO
>
>
>
> > On Mar 12, 2016, at 7:18 PM, Steve K7AWB <k7awbgoog at gmail.com> wrote:
> >
> >
> >
> > I have an aluminum mast  (which is 2” OD and 0.25” wall and about 11
> feet) out of the flat top of the Rohn 25.  Already I have a M2 17-element
> 2-meter yagi at the top of the mast.  Below that antenna, and right above
> the flat top plate of the tower, I want to put my Force 12 5BA 5-band, 15
> element yagi.
> >
> >
> >
> > With my other tower, 90 feet of Rohn 45, we put up a 6-element Force 12
> Mag 620 the first time by simply dropping each of guys and reconnecting
> once the antenna was above each guy point.  The second time we put it up,
> after balun replacement, we used a friend’s tram line and back-stay – of
> course the mast was 2” OD and 0.25“ wall and heavy!
> >
> >
> >
> > I don’t think I want to chance the Rohn 25 at 102 feet with that
> drop-the-guy process.
> >
> >
> >
> > So the question is : will a tram line work or will I bend the mast?
> Even using a back-stay might cause undue pressure and bend the expensive
> mast.  And a bent mast does not rotate nicely.
> >
> >
> >
> >
> >
> > Steve K7AWB
> >
> > Nine Mile Falls, WA
> >
> > DN17es
> >
> >
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