Use LinkPlanner and manually punch in the trees. If you're shooting through them, get higher or find another way.
Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Thu, Dec 6, 2018 at 9:34 PM Brian Webster <[email protected]> wrote: > With tower coverage and radio mobile, path calculations and results are > going to vary greatly by the amount of reliability you have set in the > configuration. What you use for spot mode for ptmp is a lot different than > if you want 99% or more uptime. Each decimal place in radio mobile wants > another 10 dB signal to meet the reliability. This is a good tool to > determine the path profile but you really want to use some other path calc > tool that is designed for PTP links so that you get a reliable uptime > calculation result. The Longley Rice propagation model used for Radio > Mobile is not that good to reliability calculations in PTP paths. It’s > usually conservative unless you have your availability numbers set too low > say at 70 or 80%. > > > > Long story short Kurt, find a path calc tool to run the signal numbers now > that you have established you have a path. As Adam has said I would not be > overly concerned with those trees in the path as much as having the right > tool to show your predicted signal. A good path calc tool for PTPT gives > you almost the exact numbers for signal you should have for alignment. > Radio Mobile and by default tower coverage will not calculate the paths the > same way. > > > > Thank You, > > Brian Webster > > www.wirelessmapping.com > > www.Broadband-Mapping.com > > > > *From:* AF [mailto:[email protected]] *On Behalf Of *Kurt Fankhauser > *Sent:* Thursday, December 06, 2018 4:32 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] 25 mile shot AF5XHD NLOS ??? > > > > after looking at another tower i think i can go with the 3 foot dishes > now. that puts me at -57 and tower coverage is supposed to be factoring in > a little bit of tree fade so even if i fade 10db more im still at -67 which > should be enough i would think. > > > > On Thu, Dec 6, 2018 at 4:12 PM Mathew Howard <[email protected]> wrote: > > So, to achieve 150Mbps each way, you would need 300Mbps aggregate with an > AF5xHD, which means that you're going to need a minimum of a 40mhz channel > at 8X (256QAM). to get 8X, you can use a maximum of 22dbm TX power, which > by my calculations, would give you a signal of roughly -58 with 2' dishes - > an AF5xHD is supposed to be able to do 8x at -65 on a 40mhz channel, so > assuming no noise and clear LOS, that'd work just fine and give you a few > db to spare. Realistically, you probably aren't going to get 8X on that > link, so you'd need to bump it up to a 50mhz channel and hope 6X works. > That lets you bump the TX power up a couple more db, and now you only need > a -69 to get the desired capacity, which starts to look a lot more > promising... but those trees could easily cost you more than 10db, and we > don't know what kind of noise you're going to be dealing with. Going to 3' > dishes on both ends should gain you 8db, but if you can't use 3' dishes, > that doesn't really matter. My guess is that those trees are going to be > cutting the signal down more than what 3' dishes would gain, but I don't > believe that trees in towercoverage are accurate enough to really try to > predict that. > > > > Of course if you don't mind burning up the entire 5.8ghz band, you could > use an 80mhz (or even 100mhz) channel, and then you'd only need 4X to get > that kind of bandwidth, which would let you go up to 29dbm TX power, and > you'd only need a signal of -71, which would mean you could afford to lose > around 20db to the trees... > > > > On Thu, Dec 6, 2018 at 2:40 PM Adam Moffett <[email protected]> wrote: > > I got over 300mbps at 16.7 miles with 3' dishes on the AF5XHD. > The catch is you need a large channel for these high data rates and you > have to have a solid SNR across the whole channel. That's no guarantee. > > I don't think those intermittent trees in the bottom half of the Freznel > zone are as big of a problem as people are making out. The bigger problem > I see is the 2' dishes. I would not bet the farm on getting 150mbps out of > it. > > -Adam > > On 12/6/2018 2:48 PM, Kurt Fankhauser wrote: > > Josh, who did you do that link for? > > > > On Thu, Dec 6, 2018 at 2:38 PM Josh Luthman <[email protected]> > wrote: > > Not just no but hell no. 150 megs isn't going to happen. I wouldn't even > count on it associating. > > > > I did a 15 mile shot and I was a lot higher on both sides maybe half an > hour from where you're at. > > > > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > > > > > On Thu, Dec 6, 2018 at 2:20 PM Kurt Fankhauser <[email protected]> > wrote: > > found another site with better looking profile, 100 foot higher elevation > on one of the ends. (see attached) > > > > On Thu, Dec 6, 2018 at 2:04 PM Mathew Howard <[email protected]> wrote: > > ubnt doesn't make a product that's going to work good for that > situation... The only thing that might work better than AF5XHD for that is > going to be AF-2X, or maybe AF-3X, but the chances of getting 150mbps out > of either of those is pretty slim. > > > > Now, as far as if AF5XHD's with 2' dishes will work... who knows, it > depends on how much the trees actually block it, which probably isn't > really possible to accurately predict. You're pretty much going to have to > try it to know what it will do, but personally, I wouldn't do it unless I > really had to. > > > > On Thu, Dec 6, 2018 at 12:45 PM Timothy Steele <[email protected]> > wrote: > > everything about that email just wants to make me ask why-why oh why.. > > > > > > I would use https://link.ubnt.com/ to find the product that would work > best > > > > On Thu, Dec 6, 2018 at 1:31 PM Kurt Fankhauser <[email protected]> > wrote: > > Trying to do a NLOS shot with AF5XHD's thats 25 miles (see attached topo). > Only have done 10-12 mile shots before that are NLOS. I have had good > success doing the 10 mile shots skimming tree tops but not sure if the > added distance is going to drastically change that. According to > TowerCoverage this link is showing it will work. Can't use 3 foot dishes > due to wind loading only able to use 2 footers. Anyone think this should > work? Only need about 150mbps each way. > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > > > > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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