Yeah, the process is completely outside of the standard interference analysis database. I don’t recall the tools they use, but it performs a 3D analysis and calculates the fresnel clearances when plotting the turbines, factoring the hub height and blade length. Pretty cool stuff.
On Fri, Feb 28, 2020 at 5:56 PM Steve Jones <thatoneguyst...@gmail.com> wrote: > Im reaching out to them, they did a path study for a similar thing on one > of our links, it was not on our dime for that link, so maybe we didnt get a > full dataset and report back, we just got a yes/no on impact, but not > enough detail to make a risk assessment. They told me they have access to > the turbine database outside the normal link analysis. > > On Fri, Feb 28, 2020 at 6:47 PM Eric Nielsen <ericlniel...@gmail.com> > wrote: > >> Comsearch does something called a “reverse geoplanner”. If you provide >> them with the turbine locations and the path details they’ll tell you the >> risk of fresnel obstruction. >> They’re equipped to do this because they perform the microwave studies >> for wind farms. >> >> On Fri, Feb 28, 2020 at 5:43 PM Steve Jones <thatoneguyst...@gmail.com> >> wrote: >> >>> I have a 3 link path i need to turn up in 11ghz. we drove the path >>> yesterday. 2 legs are golden. one however is problematic, ive got two wind >>> turbines that are in or just outside the fresnel. If it were one, id >>> probably be inclined to risk the impact if there was just one turbine, but >>> two is iffy without some good maths to support it. >>> The path is 5.5 miles >>> the first turbine is 3.64 mile >>> the second is about 4.69 miles >>> Fresnel is about 25' radius at that distance max if the calculator is >>> right >>> the first turbine is maybe 100' from boresite >>> the second is probably 150' >>> These arent our normal turbines, these the the bad motherfucker >>> turbines, so the blades are like a million feet long, actually IIRC theyre >>> 224' on something like a 400' pedestal. >>> >>> I need to pull the specs again on those and get better than google earth >>> GPS coordinates on the potential end points, and some better actual heights >>> >>> that brings be to the question, how do i calculate a partial fresnel >>> obstruction with a radius like the blade pattern. >>> >>> I figure boresite view with a 50' circle would give me worst case >>> fresnel, then i just draw the arc of the turbine path into that as an >>> obtruction for each maybe just shade the polygon it create as a complete >>> obstruction. >>> >>> So once i have that info, what tool can i put it into to calculate the >>> impact? everything we use just has an obstruction height. Would i be able >>> to just take the distance from edge of fresnel into the furthest point of >>> the polygon? Would I need to calculate more loss than that? >>> >>> Im planning on sticking a 5ghz link up anyway pending licensing, so i >>> assume i can just extrapolate the loss from that >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> -- >> Eric Nielsen >> 571-508-7409 >> ericlniel...@gmail.com >> > -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Eric Nielsen 571-508-7409 ericlniel...@gmail.com
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