Also... Dont under estimate how heavy 4" pipe is. Escpecially a 10 ft
peice. Definately takes two people to lift. And not eay to lift hanging over
a ledge. Personally, I would consider it an unnecssary safety risk, to mount
a 4" pipe over edge without ground directly underneith, just for a 30in
dish. If you are having to brace your poles anyway, I'd argue that a 3"
pole would be plenty sufficient for 30" dish.
I'd be lobbying for a non-penetrating roof mount for on the other side of
the railing, even though it is technically offlimits. We generally don't
allow building management to call the shots on engineering. Instead, we do
our best to accommodate their wishes, but if some restriction they ask is
causing a safety hassard, we instead attempt to convince them why we need an
acception, and why it is to their advantage to accept our suggestion.
Everyone wins in the long run, and they'll likely respect you more for
bringing the situation to their attention.
If you MUST mount at that position, I can make the following suggestion.....
A cantelever mount creates strength by increasing the disatance between two
mount points. There is no reason the two mount points must be to the same
wall surface depth. My suggestion is to use the lower wall, even though it
is recessed 1 ft back further. Use the wall section between the louvered
windows, and put the bottom mount there, about 3 feet below the top mount.
The bottom mount of course will have to have a strut that extends out to the
distance parallel to the top cement mount point, so it can clamp to the pole
and keep it verticly true. The top mount point must of course be aligned
with the bottom wall mount point, between windows.
With Cantelever mounts, and tall masts, what you worry about is the screws
getting pulled out of the concrete, because of the leverage of the top arm
where the dish is. There is also risk of concrete cracking, when using thick
anchor holes, so close to where the railing post is getting secured. So your
top mount would be stronger by keeping it centered in the middle of the
thicker concrete wall.
There are other technicques, such as mounting to the bottom of the overhang.
For example, if you let the pole drop 2 feet below the concrete overhang,
you could then angle a strut back to the underside of the over hang.
Again, the secret to a strong cantelever is the distance between the two
mount points. Because the mast is going 10ft up, it make sense for you to
drop as low as possible also to create stronger cantelever.
alternatively, There are some very heavy duty tower mounts ment to offset
masts 2-3 feet away from the tower. One of those could be used for lower
mount, or two of them, if needed.
They offset mounts are shaped like... I________I
I________I
I
I
In the above there are two hotrizonal and two verticle masts welded, to make
the mount.
If you only want to use the main songle concrete overhand, you can do it by
making a triangle prism. Basically you use two of the above mounts. They
each mount to the concrete at 2-3 ft apart.
Then rotate the outside pole of both mounts towards each other until they
connect and touch. Then mount the 4" mast at that point, to the combined
mount masts. What that would do is it would allow you to spread the windload
across 4 mount points, and two seperate stress points on the concrete. You
could then use 3 ubolts to clamp the mast to the mount extentions.
Anyway, they probably already make a mount to do exactly that. Windstar did
something a bit different. Sometimes I;d see... They'd have a triangle
shaped platform mount, where the 4" pole's base screwed down into the
platform, then the platform mounted to the wall. It would usually have two
heavy duty mount points horitontally seperated, then one verticle angled
strut down to the wall. .
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Brad Belton" <[email protected]>
To: "'WISPA General List'" <[email protected]>
Sent: Sunday, May 17, 2009 9:21 PM
Subject: Re: [WISPA] How to stabilize Pole for 30" Drum Antenna?
> Buy two mounts similar to the unused mount in the RED circle and mount
> them
> as far apart as possible in an available clear spot on the building like
> the
> BLUE circle. We mount 3.5" - 4" pipes with mounts like that all the time.
> A 30" antenna on a 4" pipe with two mounts anchored properly into concrete
> isn't going to move. 11GHz is pretty forgiving (relatively speaking vs.
> 38GHz - 80GHz) of wind vibration etc.
>
> Hutton has the mounts in a couple different sizes and they come with the
> stud/bolts for concrete. Simply hammer drill the anchor holes to a proper
> depth, fill with a loc-tight concrete adhesive and tap in the studs. The
> studs should be fairly snug/tight when tapped into place. Tighten the nut
> with flat washer down on the stud until tight, wipe away any extra
> adhesive,
> back the nut off the stud, place mount over studs and tighten nuts again.
> Good for a hundred years...or so. <grin>
>
> Best,
>
>
> Brad
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Gino Villarini
> Sent: Sunday, May 17, 2009 5:39 PM
> To: WISPA General List
> Subject: Re: [WISPA] How to stabilize Pole for 30" Drum Antenna?
>
> Actually, check this pic... Its self explanatory... This is the only setup
> we can do on the bldg... But we are left without a perpenticular
> stabilizer...
>
>
> Gino A. Villarini
> [email protected]
> Aeronet Wireless Broadband Corp.
> tel 787.273.4143 fax 787.273.4145
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Gino Villarini
> Sent: Sunday, May 17, 2009 6:35 PM
> To: WISPA General List
> Subject: Re: [WISPA] How to stabilize Pole for 30" Drum Antenna?
>
> Well imagine that we have a big wall...were we would install a wall mount
> base and the 4"pipe, the Pipe would potrude from the wall and the antenna
> would be installed in the upper part of the pipe above from the wall ...
> Point is we could install stabilizing arms to the pipe and the wall...
> They
> would be parallel to the wall ... But we don't ahave any other surface to
> intall a stabilizer in a perpenticular way to tha wall
>
> Clear? No?
>
>
> Gino A. Villarini
> [email protected]
> Aeronet Wireless Broadband Corp.
> tel 787.273.4143 fax 787.273.4145
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Jack Unger
> Sent: Sunday, May 17, 2009 6:29 PM
> To: WISPA General List
> Subject: Re: [WISPA] How to stabilize Pole for 30" Drum Antenna?
>
> Gino,
>
> Can you clarify what you mean by "parallel" and "perpendicular"
> (relative to what)?
>
> jack
>
>
> Gino Villarini wrote:
>> we are goint to mount a 30" 11 Ghz Drum in a bldg rooftop, we are
>> goint to use a 4" Mast, any ideas on how to stabilize it?
>>
>> We have parallel atachment points but none perpenticular... any ideas
>> on this?
>>
>>
>> Gino A. Villarini
>> [email protected]
>> Aeronet Wireless Broadband Corp.
>> tel 787.273.4143 fax 787.273.4145
>>
>>
> --
>
> Jack Unger - President, Ask-Wi.Com, Inc.
> Author - "Deploying License-Free Wireless WANs"
> Serving the Broadband Wireless Industry Since 1993 www.ask-wi.com
> 818-227-4220 [email protected] Follow me on Twitter - "wireless_jack"
>
>
>
>
>
>
>
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