Is solar interference polarized, such that it would affect only one polarization in a dual pol link?
From: AF <af-boun...@af.afmug.com> On Behalf Of Forrest Christian (List Account) Sent: Tuesday, August 13, 2019 6:18 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] 820 Support Help One thing to look at that often gives you a hint as to the cause is the the signal strength during the period of interest. An interferer rarely causes the signal level to drop. Instead the noise (and sometimes the signal) level rises to the point where the radio cannot maintain a link. I've also seen where too strong of a signal can cause this issue. The signal gets strong enough that the receiver saturates and the radio cannot maintain a reliable link. A brief dropoff would indicate something in the path. I.E. delivery truck fade. I also am aware of certain links which have once a day problems when the sun becomes an interference source. This is of course only a few days a year and only for the brief period of time that the sun is sitting directly behind the transmitter. On Tue, Aug 13, 2019 at 5:10 PM Ken Hohhof <af...@kwisp.com <mailto:af...@kwisp.com> > wrote: Is there anything he can do to confirm interference or rule it out, short of coordinating a different set of frequencies (assuming that is even possible)? What do the big carriers do in such a case? Can the radios monitor for signal level if the other end is muted? Sending someone up the tower with a spectrum analyzer and a waveguide adapter seems not feasible if this happens for 5 minutes a couple times a day. Cambium saying it “might be interference” doesn’t seem particularly helpful unless you can test their theory. From: AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com> > On Behalf Of dave Sent: Tuesday, August 13, 2019 4:38 PM To: af@af.afmug.com <mailto:af@af.afmug.com> Subject: Re: [AFMUG] 820 Support Help If it is interference then I would be checking with comsearch or one of the other coordinators to see if anything recent has been issued for license. If not then a re-check on alignment would be the other step taken. On 8/13/19 12:43 PM, Nate Burke wrote: Any cambium 820 support people lurking on here? I've been having trouble with an 18ghz 820C link since the beginning of July and My support ticket only get's updated by Cambium every couple days. I was hoping that there might be someone who would be able to help me out with a little quicker turnaround. It's modulating way down on 1 chain in 1 direction a couple times per day, for less than 5 minutes. Most of the time it works fine. The last work from support was that they think it might be interference. I'm hoping to get a little more direction in trying to track down what's going on, but with only a few responses per week, I'll be working on this until Christmas. Thanks, Nate -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- - Forrest
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