I've seen this on e.g. radwin with interference. Might be the calculation of rx-power is not correct with interference in some cases.
----- GENIAS INTERNET -- www.genias.net ------ Stefan Englhardt Email: [email protected] Dr. Gesslerstr. 20 D-93051 Regensburg Tel: +49 941 942798-0 Fax: +49 941 942798-9 -----Ursprüngliche Nachricht----- Von: Af [mailto:[email protected]] Im Auftrag von Matt Jenkins via Af Gesendet: Freitag, 21. November 2014 18:53 An: [email protected] Betreff: Re: [AFMUG] What can cause Rx signal drop like this on 900 SM Interference shouldn't cause a drop in DB level. Matthew Jenkins SmarterBroadband [email protected] 530.272.4000 On 11/21/2014 09:47 AM, David via Af wrote: > That or neighbouring wisp with other gear. > � > On 11/21/2014 10:27 AM, Jerry Richardson via Af wrote: >> >> That my first guess as well, alignment. >> >> � >> >> *From:*Af [mailto:[email protected]] *On Behalf Of *Bill Prince >> via Af >> *Sent:* Friday, November 21, 2014 8:24 AM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] What can cause Rx signal drop like this on 900 >> SM >> >> � >> >> We have seen this when a tree or branch fell on the SM.� Saw >> something like this when the SM was mounted on a tree and the tree >> fell down (amazingly, the SM stayed registered, even though the yagi >> was pointing into the ground). >> >> >> bp >> <part-15@SkylineBroadbandService> >> � >> >> On 11/21/2014 7:12 AM, Paul Conlin via Af wrote: >> >> Attached Cacti plots show a sudden and significant drop in Rx >> signal from -56 to -65 around 10pm yesterday.� What can cause >> such a change?� The graphic shows 24 hours.� The SM says it >> has been registered for 21 hours since we rebooted AP to change >> channel so the gap in the middle is not a re-reg.� Must be a >> sample Cacti missed or is it?� Is it a coincidence this missing >> sample happens right when the signal level changes?� This is a >> P10 900 SM.� SM and AP running 13.1.3.� Link test is >> currently 100x100.� 0.3 miles from AP through some trees.� >> Very rural location.� AP at 65 feet AGL.� SM at 25 feet.� >> Eight other SMs on this same AP show absolutely no change in >> their signals when this specific SM has such a dramatic >> change.� Nothing special about weather last night.� This SM >> has been having these Rx signal swings for about 3 weeks.� AP >> has SM Tx power control set to -64. >> >> � >> >> On the previous channel it would drop when signal was at lower >> tier so we made this channel change.� None of the SMs hint at >> interference on any channel although another SM showed signs of >> interference too.� Our next closest 900 AP is 8.1 miles.� >> This SM reports beacon from only one AP.� All AP�s are GPS >> synced. >> >> � >> >> � >> >> PC >> >> Blaze Broadband >> >> � >> >> � >> >
