[HamWAN PSDR] VOTE: Blyn HamWAN Site REVISION A

[Doug Kingston]

 I vote Yea.

On Fri, Jun 26, 2020 at 3:29 PM Bart Kus <me at bartk.us> wrote:

> Hello,
>
> Upon further review of the mounting hardware, I appear to have
> "misunderestimated" the required Unistrut.  My original thinking was to
> bisect 3 10ft Unistrut sections and use 5ft pieces top+bottom to form
> the 3 required dual-offset arms.  I have since studied the Rohn 45G
> specs, on page 12 here:
>
> https://www.rohnnet.com/files/45G_90MPH_DWG_0105_ASSYPKG.pdf
>
> The tower is 1.5ft wide, so a 5ft piece of strut would only have 1.75ft
> of stick-out at the very end, which would also need to come in a few
> inches to hold the 2" mast pipe towards the end.  This is packing things
> too tightly.  We need to clear some guy wires up there, and more
> separation in general would be better.  Since we need more stick-out, we
> can no longer simply bisect the 10ft sections, so the count of required
> strut needs to be doubled from 3 to 6 sections.  Furthermore, due to the
> longer stick-out and the requirement for microwave gear to be steady and
> not wobbly, we need to use more rigid Unistrut.  This is available in
> the form of back-to-back welded channels.  At a 2.5ft stick-out for
> example, the back-to-back channels exhibit 2.6x more rigidity than
> single channels.
>
> I have created a new Blyn spreadsheet here:
>
>
> https://docs.google.com/spreadsheets/d/1zUqJWOPQXt4Qv6iYbQs2cHTLbL5NOdQ5ail44FZH3Kw/edit?usp=sharing
>
> Which doubles the Unistrut count and also specifies the more rigid
> strut.  The keen-eyed will also notice a change from U-bolts to 1.25"
> pipe clamps.  There is no cost difference there.
>
> I am aware of the thread arguing for the removal of a sector from the
> site, but I don't think the foundations of the arguments are valid, so
> this revised proposal keeps all 3 sectors.
>
> My vote for this revised proposal is: Yea.
>
> --Bart
>
>
> On 6/24/2020 11:11 AM, Bart Kus wrote:
> > Hello,
> >
> > I've put together the spend request to deploy HamWAN coverage to Blyn
> > Mtn:
> >
> >
> https://docs.google.com/spreadsheets/d/12lho76dJUSlXiJRy0UzYlnG66JHQeDzPMBZUxxYs3DY/edit?usp=sharing
> >
> >
> > The site is at (48.006678°, -122.972668°), has a 110ft Rohn 45G tower,
> > will provide a high speed link between SnoDEM and Victoria, as well as
> > providing regional omnidirectional coverage.  Once HamWAN is
> > installed, my understanding is there will be some DMR repeater(s)
> > going on the air there.  There is already a corresponding dish @
> > SnoDEM for this site, and has been for years.  We've also got
> > confirmation that we'll be able to get a dish installed @ Triangle for
> > the Victoria end.
> >
> > 24-hour director voting period for this starts now.
> >
> > My vote for this is: yea.
> >
> > --Bart
> >
>
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