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Konrad Meier meierk at informatik.uni-freiburg.deHi Harald, On 16.07.2011 15:51, Harald Welte wrote: >> We have two nanoBTS-Booster 1800 here at the university. If for some >> reason the Ericsson RBS is not working it should be possible to lend >> you the two bossters for the time of the camp. We also have a >> splitter and combiner. I will test the splitter/combiner in >> combination with a booster at the GPN end of this month. > > As it turns out, I have not yet managed to get the Motorola BTSs > working, despite putting lots of time into it. There are many reasons, > but basically the Motorola BSS is _extremely_ different from normal GSM BSS > > So while I might still get it to work, I doubt it, and it would be > better to pursue different plans now. > > We can certainly bring together a sufficient number of nanoBTS units to > fill all our ARFCN. The problem now is the coverage<-> capacity > problem, i.e. I don't want 6 BTSs with small coverage area, but rather > something like 2 or 3 sites (max) with each 2 or 3 BTSs. > > Have you meanwhile tested your splitter/combiner/booster setup? does it > work? The original plan was to test the setup at the GPN. But stupid me forgot to order the RJ69 connectors :-( Last week I was finally able to try the multi TRX setup with two nanoBTS, but without success. TRX 0 worked well but TRX 1 was not working for some reason. I think the problem is the initialization of TRX 1. The nanoBTS are pretty new: Equipment_Version='165g029_73' Software_Version='168a352_v142b30d0' Unfortunately I didn't had the time to investigate the issue further. Maybe tomorrow I have some time. > What I can really easily re-use from the Motorola BTS are 2x hybrid > combiner/duplexer units, i.e. something that has the following ports: > > * 1 antenna output, bidirectional, 7/16" socket > * 2 PA Tx inputs, SMA > * 1 Rx antenna output, N-type > > So if you don't have a similar setup, we could use those together with > two nanoBTS with a Rx LNA and a Rx splitter. > > I have six of those hybrid combiner/duplexers. I have two "SPLIT2P-SMA" from "Global Professional" [1]. My Idea was to use these two units with one naoBTS-Booster like shown here: [2] Your idea sounds good too, but would require some RX LNA. > I _might_ also get the Rx LNA + splitter of the Motorola BTSs to work, > but those are less stand-alone and I'm not certain about it. > > What do you have in terms of antennas? We have two omnidirectional antennas from PROCOM: CXL 1800-3 More information: [3] > Also, when would you be able to provide the equipment to me? I would > want to put everything together + test it well ahead of the camp, > probably around August 1st. Ok, I will see what I can do. Best regards Konrad Meier [1] http://www.globalprofessional.co.uk/acatalog/Splitter_mod.html [2] http://lab.ks.uni-freiburg.de/attachments/download/260/setup.png [3] http://www.procom.dk/eng/Page_menu/Products/Base_Station_Antennas/1.3_-_2.0_GHz/Omnidirectional_Antennas/CXL_1800-3