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Konrad Meier meierk at informatik.uni-freiburg.deHi Lennart, On 27.07.2011 04:25, Lennart Müller wrote: > Good morning, > > I would like to use two directional antennas with a nanoBTS DCS1800. > As far as I know, first I need a duplexer to use one antenna both for RX and TX > - does anybody know a cheap model? I found only one for 500 Euros. The nanoBTS-Booster from Proximus has an integrated duplexer + HPA and LNA. I have two of them and they work great. http://proximus.com.ua/Nano_BTS_high_power_GSM_booster.html But in the past a loot of people tried to contact Proximus without success. The price for one Booster is about 1300 Euro. > Second, to connect two antennas to the duplexer, I need a power splitter. > Can somebody suggest one for duplex usage? > > Third, to improve indoor signal level, there are plenty offers of duplex > repeaters, but the legal situation is unclear because one might produce > distortion on ARFCNs different from his own. Again, anyone with experience? > Maybe a suggestion for a model with a fixed ARFCN setting? Some days ago I looked at the legal situation of broadband GSM repeaters in Germany. At least in Germany there is no way to operate such a device if you are not an operator. If you find an repeater that operates only on a specific ARFCN and you have a license for that frequency than it may be legal to operate such a device. Best Regards Konrad