[TowerTalk] Sidemount yagis

[Richard Boyd]

Yeah, but that square foot rating is at the top, right?  I've never seen
figures on how sidemounting yagis decreases the allowable "at the top," and
how much sidemounted at various spots on the tower, and depending on the
guying of course, is possible, IN ADDITION TO what's at the top.

To take an extreme, something sidemounted a foot, or 5' or 10' above the
ground wouldn't add much wind loading at all to the tower, I wouldn't think.

I know this point could be said better and I know what I'm saying is
completely unscientific...but scientific answers have to start with
theoretical speculation, right?

73 - Rich, KE3Q


----- Original Message -----
From: <K7LXC@aol.com>
To: <WD4K@bellsouth.net>; <Towertalk@contesting.com>
Sent: Tuesday, April 04, 2000 1:19 AM
Subject: Re: [TowerTalk] Sidemount yagis


>
> In a message dated 04/03/2000 5:05:19 PM Pacific Daylight Time,
> WD4K@Bellsouth.Net writes:
>
> > I would appreciate some opinions on sidemounting rotating gate type
mounts
> >  for large yagis on Rohn 25. Conditions: Tower is 74', guyed at 64', 3
sets,
> >  Top two are Philly and bottom is 1/4EHS at abt 32', just under where
the
> >  gate will be mounted. Want to mount a C31XR at this level, 85lbs. Other
> >  option is a long mast with ground mounted rotor with tower standoffs.
Any
> >  advice from anyone with any experience with KT34's, C31's or similar
yagis
> >  would be VERY welcome!  Replies to me directly are probably best and I
will
> >  be happy to summarize to anyone interested.
>
>       I think the *magic* dimension between elements is about 31 inches.
If
> you split the difference, there's about 15 inches from the clamp to the
> nearest element. I know that a TH7DX (19 inches from the clamp to the
nearest
> element) will turn around 45G which is 18" across the face. So the best I
can
> do is give you a "maybe" without building a fixture and trying it out.
Sorry.
>
>      What else is going to be on the tower? That 25G @ 70 MPH will take
about
> 15 sq.ft. total and one C31XR is 10.7 ft2. Doesn't leave much left over.
>
> Cheers,   Steve   K7LXC
> Tower Tech
>
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