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those harmonics) must be above: -30 dBm @ 30 kHz span above 1 GHz -36 dBm @ 30 kHz span below 1 GHz In case of UmTRX without an amplifier it's enough to use a ceramic or SAW duplexer to bring harmonics below those levels. For those buying UmTRX's as a lab package of universal UmDESKs, we offer to buy an external ceramic duplexers. These improves coverage and solves the out of band noise issues. For those buying band-specific UmDESK's, we use SAW duplexers, which are even more efficient in reducing out of band noise. >> A calibrated USRP N200 running osmo-trx passes RF spectrum and >> modulation accuracy requirements of 3GPP 05.05 by very large margins >> and is competitive with commercial GSM equipment in this regard. Other >> SDR devices are also capable to varying degrees. > > The policy of FCC vs. European Union is quite different. There are more > norms that apply in Europe. You're obviously more proficient in European norms. Could you point me to a link where we could find these differences between the ETSI published GSM Standard and European harmonized norms? It would be a very good addition to the OpenBSC wiki's "Standards" page. --=20 Regards, Alexander Chemeris. CEO, Fairwaves LLC / =D0=9E=D0=9E=D0=9E =D0=A3=D0=BC=D0=A0=D0=B0=D0=B4=D0= =B8=D0=BE http://fairwaves.ru