I only know that folks in areas with pines have reported worse loss than other types of trees.
From: Jaime Solorza Sent: Monday, February 8, 2021 4:13 PM To: AnimalFarm Microwave Users Group Subject: [AFMUG] What kind of signal loss ? 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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