What I'm doing on my rotating tower (R45) is to have a mast at the top that
has its own rotator. Green Heron controllers on that top rotator and on the
prop-pitch that turns the tower are networked (via their serial ports) so
that the top antenna can be independently rotated or returned to the stack
as desired.
73,
geo - n4ua
On Mon, Jan 9, 2012 at 11:23 PM, John W <xnewyorka@hotmail.com> wrote:
>
> If I have a Rohn 45G tower of a given height, let's say 90', guyed per the
> Rohn book, and rotating from the base, hosting several side-mounted yagis
> for 10m (3), 15m (2), and 20m (1), and I want to add another antenna up at
> 100' (a small 40m 2L) that also rotates with the tower, which one is the
> safer/better installation: adding a mast that protrudes 10' above the top
> of the tower (and for some distance down into the tower), or adding another
> 10' section and sidemounting the new antenna at the top of it?
>
> This is a theoretical question, because I haven't built the tower yet, but
> I plan to.
>
> The first reply many might have is probably: Why don't you just build it
> to 100' per the book, instead of 90'?
> The answer to that is that I don't have enough real estate to put guy
> anchors 80' from the base, I only have 72' available.
>
> Also, I have not even seen hardware that allows adding a FIXED mast at the
> top of a Rohn tower - sort of like a thrust bearing that can't turn. How is
> this typically done?
>
> Thanks & 73,
>
> John
> W2ID
>
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