Hello Joerg, Joerg Reisenweber wrote: > I just confirmed basic functionality of 850/1800/1900 devices (US Freerunner) > for 900MHz networks. RF sensitivity is poor, but sufficient for areas with > good coverage. > For Germany a US device (850/1800/1900) worked flawlessly with German > operator > T-Kom (in urban area), and rather poor with Vodafone. Both are 900MHz > networks. > > Please notice I didn't yet check for the actual band used, so *if* T-Kom > *and* > Vodafone both had 1800MHz BTS here in the tested area, then this report might > be moot. Anyway the result meets expected behaviour and 1800MHz BTS are not > known for either operator. >
So this is what I suspected but could not be answered by anyone till now. According to my investigation the only difference between the two variants should be a different filter in the reception path, in one case a bandpass filters GSM850, in the other it is GSM900. Transmitter path should be the same. As a result the phones should work in all four bands, however with about 30 dB less signal strength in the not supported band. A different issue is calibration, its not sure if the transmitter path for all four bands is calibrated properly. Best regards, Dieter _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
