I thought the license said 4.5m antennas. I wonder what the system gain is comparing Cambium and Aviat?
From: Tim Hardy Sent: Friday, May 17, 2019 4:12 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Cambium I researched this some and here’s some additional information: The original Bald - Passive - Castle Pk path was built in the 1992 time frame and it was 2.1 GHz digital. The 2.1 GHz radios and antennas were changed out to 11 GHz when the 2.1 GHz band was reallocated to PCS in 2010. PCS licensees were required to reimburse current 2.1 licensees’ total cost for a comparable system in another band. The 11 GHz path is using 10’ antennas (not 15’!), Andrew HP10-107F models with 48.3 dBi gain. It was originally installed with Alcatel MDR-8611-135 TDM radios operating fixed modulation at 64 QAM (ACM was not available back then, and it wasn't legal anyway). It appears that this old TDM system was seriously power limited (15 dBm maximum on both sides) and I assume that this was due to extreme frequency congestion in the area (but thats just an assumption, but another reason why big shrouded antennas would be necessary). The Bald - Moab path was originally built in 1992 and licensed to Mountain Bell (the records are kinda sketchy) and it has two duplex 6 GHz pairs and two duplex 11 GHz pairs. When they decided to change from TDM to IP they naturally wanted to re-use existing plant as much as possible. I have no idea why the Cambium system had issues, but can guess that the problems were probably in installing and provisioning the radios properly. It’s curious that they apparently had no reported propagation issues with the old TDM radios on the two paths. The licensing is correct as they described it. Bald Mesa - Moab has applications on-file for the Aviat WTM radio and they can operate under conditional authority - the second hop has not been filed for yet. Someone mentioned using space diversity antennas as a way to reduce antenna size - these would have no-effect in a rain limited situation (they mentioned fog and didn't say anything about multipath). On May 17, 2019, at 3:22 PM, <[email protected]> <[email protected]> wrote: Yep. I spent about 15 minutes with Radio Mobile and found a spot in the valley floor they could move to and eliminate the passive. The spot is near their existing land lines, it has visiblility to the remote and power, so they could do an active repeater there if they did not want to plow cable to it. From: Bill Prince Sent: Friday, May 17, 2019 12:56 PM To: [email protected] Subject: Re: [AFMUG] Cambium That size antenna on a mountain top and a passive repeater? Sheesh. bp <part15sbs{at}gmail{dot}com> On 5/17/2019 11:20 AM, [email protected] wrote: 4.6 Meter antennas. 15’ Wow. 48.3 dBi From: [email protected] Sent: Friday, May 17, 2019 12:18 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Cambium Thanks Looks like Frontier did not update their license ... 11 Ghz Still shows Alcate MDR-8611-135 radio. 16 km on one side 1 km on the other side of the billboard. That seems to be the requirement for billboards, very short leg on one side. From: Cassidy B. Larson Sent: Friday, May 17, 2019 12:14 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Cambium Maybe this one? https://wireless2.fcc.gov/UlsApp/UlsSearch/licensePathsSum.jsp?pageNumToReturn=1&licKey=963392 Contact is Frontier.. -- ---- Cassidy B. Larson CTO - InfoWest, Inc. Voice: 435-773-6073 [email protected] ---- On May 17, 2019, at 12:03 PM, <[email protected]> <[email protected]> wrote: Cambium is getting torn up at a Utah Public Service Commission hearing this morning. Frontier installed a pair of Cambium something between Bald Mesa and Castle Valley Utah in December to change out a TDM radio. Bad fading on Cambium. A resort ranch filed a complaint and I am listening to he hearing this morning. Frontier is complaining that they got no support from Cambium. The radios would work for 3 or 4 days and then troubles would come again over and over. Frontier changed out the Cambium radio in March. They removed Cambium and said they have removed them as a vendor company wide. They changed to Aviat. Supposedly the new radios fixed everything. Typing this as I am listening to the hearing. The ranch still had some problems after changing to Aviat. Frontier says that the the new radios fixed everything. The new radio has not had any drop outs. This is a two hop system. They are changing out cambium on the second leg with Aviat soon. Passive repeater system on the second leg. Fog causes fading. Drops modulation down to low QAM levels. Frontier claims the second Aviat radio will make this network flawless. When asked what that means Frontier answered 99.99% Frontier is in process to take action against Cambium. CAF money was used to buy the Cambium radios. Second leg is scheduled for commissioning next week. Someone should take a look at this license and tell me the details on that passive repeater side. I am curious as to the leg distances. Too lazy to look it up. Frontier Telephone Company or whatever they are called now. Moab to Bald Mesa. Bald Mesa to Castle Valley. Passive on the second leg. I am betting these are 6 GHz links with huge antennas. -- 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 -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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