this is one that was part of a group of similar issues. We had one that is white paper level multipath. I can tell you the day and time they start the harvest across the street and the time they finish it. that one we ended up just installing 2 radios and they swap power supplies twice a year.
this one is facing west and looking at it the dips begin sharply around 4pm the last week, around noon the week before. thats about the time it starts to cool back down, not that its all that warm. its muddy fields so the surface is soggier in the day, firms up more when it cools. yesterday was super windy and it didnt do it, probably the soil is dryer. IIRC i have her radio right now peaking over the ridge of the roof from her tower. Im planning on going out and putting it on a 12 foot post to halve the fresnel, sable marginal is better than unstable marginal. the first guy i mentioned here is actually a pretty cool case. this general region is super high iron content in the soil, we have another area this is really common and their soil samples are really high as well, i dont know if iron oxide is more reflective han dirt dirt or if certain circumstances make it that way. or could be whatever causes the soil to be more iron rich causes it. or soil content could have nothing to do with it. I had gotten the sample results from a soil testing joint thats a customer, thought i could figure it out but its one of those things somebody smarter than me could probably figure out. On Thu, Mar 11, 2021 at 3:23 PM Brian Webster <[email protected]> wrote: > Doe this customer have the issue at a certain time of the day? Maybe > around sunrise or sunset. It may be possible that it’s not multipath but at > certain times of the year the antenna has a good path to picking up noise > from the sun and that could be stronger than your AP signal? This usually > is exhibited on paths that have an East/West orientation. Depending on the > gain of the antenna it can be worse than others. Think of the sun either > just above the horizon at sunrise or sunset and the focal beam on the > antenna is such that it picks up that noise enough to be stronger than the > AP. Depending on the time of year, tilt angle of the Earth etc., it looks > like a seasonal issue. > > > > Thank you, > > Brian Webster > > www.wirelessmapping.com > > > > *From:* AF [mailto:[email protected]] *On Behalf Of *Steve Jones > *Sent:* Thursday, March 11, 2021 1:36 PM > *To:* AnimalFarm Microwave Users Group > *Subject:* [AFMUG] multipath on a reflector > > > > our APs sit between 90 and 110 feet on average in flat terrain so we deal > with alot of seasonal ground reflectivity issues. We have this one customer > presenting again with whats probably multipath fading, I had tried putting > a shield on the bottom half of the reflector once out of curiosity. It > didnt do much > > what im wondering though is how the ground reflected multipath feeds into > the feedhorn. > > is it reflecting off the top half of the dish and into the feedhorn like a > mirror? > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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