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.
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