This is for a 40' 25G tower, roof mounted, using a Hazer to support SteppIR
antenna.
Hinged plate would make it easier to erect, but is it reliable over the long
haul?
Is it sturdy enough to support the structure with 2 guys detached, as is
recommended to lower/raise the hazer?
David, WA6PXX
> -----Original Message-----
> From: David Giuliani [mailto:David@Giuliani.org]
> Sent: Tuesday, November 04, 2003 12:20 AM
> To: Towertalk
> Subject: Hardware for roof antenna...
>
>
> I'm building a new house and want to prepare it for mounting a roof
> antenna "support structure" to the garage. I'd love to get any and all
> advice re completing framing and roofing, for later tower installation.
>
> Current antenna plans:
> 80 mph wind zone, never much ice
> 40' Rohn 25G tower mounted on peak of roof (at 28' elevation).
> (<-- is this still a good choice despite Rohn being in financial
> difficulty? Alternative manufacturer?)
> 10 sf antenna max (e.g. SteppIR, 2 meter beam, 144/440 vertical)
> Hazer system (e.g. Glen Martin)
> 1 or 2 guy wire sets at 120 degrees
> lower end of guy wires attached to corner framing of house, 25' from
> base
> radio room immediately below antenna, 1 story down
>
> Attachment to house
> guy wires:
> anchors rated at 5,000 #, mounted to roof truss (designed for
> attaching climbing equipment) but terminating with a nice "Eye"
> (<-- better idea?)
> lots of metal tie bars holding wood members together and down to
> foundation
> base:
> vertically placed glue lam penetrating through roof peak, bottom
> well tied to central bearing post.
> BP25G base plate, bolted to lam (<-- better idea?)
>
> Conduit: 3" PVC with service head (<-- suggestions?)
>
> Grounding: (<-- haven't finished designing this part yet; ideas?)
> #2 copper stranded wire running through bldg to 10' ground rod
> sunk in ground
> clearance between ground rod and concrete floor
> 2-4 copper straps running down roof and along outside of bldg to
> ground rods, 2 rods per run
>
> Anything else to consider?
>
> David Giuliani, WA6PXX
> Mercer Island, Washington
>
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