Linkplanner doesnt calculate penetration, trees are full obstructions. one of the very very few things i dont care for about linkplanner. I dont know if radio mobile would give you closer numbers. radiomobile has an online version thats easy to use
On Mon, Feb 8, 2021 at 5:14 PM Jaime Solorza <[email protected]> wrote: > We installed a licensed 928.xxx/952.xxxMHz link for SCADA project. We were > only hired to install some VFD controls, the radio and antenna on a > supplied 10 ft. mast installed by general contractor. > They opted not to pay for a site survey from us months ago. > When we were on site, I told the project mgr. that some existing trees a > few feet in front of the antenna and the ten foot height were going to > severely affect signal. He said go ahead and we will deal with it later. > Later arrived. The link works with zero packet loss and all equipment > responds as requested. The lift station is operational at -106dBm!!! > The SCADA manager noticed that and now wants us to get it into the mid > -60s range...I explained to him that we need to clear the trees to get a > stronger signal. > Five watt radio at mountain with 90ft of 1/2 inch Heliax and 12dB sector > antenna...with 12dB yagi and same power at Lift Station...my calculations > with trees show a -63dBm. I tried entering the trees (pine) but it threw > the calculations way off. > Trees are 30 ft. high and about 30 ft. in front of antenna and then > several more about 250 ft. in path. > How much absorption are these trees causing based on typical path analysis > on empirical evidence? > Thanks > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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