3 Jan
2022
3 Jan
'22
11:31 a.m.
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.
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
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.