https://mimosa.co/blog/deploying-a-diversity-link
On Thu, Mar 11, 2021 at 5:35 PM Steve Jones <[email protected]> wrote: > id considered something like this but to make it a functional thing it > would have to monitor the two radios and turn up or down a port based on > better performing system. the guy with the two radios doesnt complain, > prefers to not have to wait on us to come move it up to the roof or down to > the post. its cheaper than a truck roll twice a year. > > but to the original question, a ground reflected wavelength to a > parabolic antenna, is that reflected off the top half of the dish into the > feedhorn? > > On Thu, Mar 11, 2021 at 4:23 PM Chuck McCown via AF <[email protected]> > wrote: > >> Since none of the PMP vendors have a space diversity option, I wonder >> about just putting up two radios and bonding them at the ethernet level. >> If it is multipath fading, both radios should not be faded at the same >> time. Would OSPF or RSTP or EIGRP be able to deal with this scenario? >> >> *From:* Steve Jones >> *Sent:* Thursday, March 11, 2021 2:44 PM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* Re: [AFMUG] multipath on a reflector >> >> 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 >>> >> ------------------------------ >> -- >> 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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