Hi Dieter, Zitat von Dieter Spaar <[email protected]>:
> There is one problem with the USRP1: You don't have enough USB bandwidth to > cover all hopping channels at once, at least not for a general scenario > where the hopping channels are spread over the whole band (especially bad > with GSM-1800). And the FPGA is too small to do the channelisation, at > least for lets say 16 channels (with some trick it might be possible > somehow, but this is surley nothing which could be done in a few days). > And even than you might have cells which use more channels for hopping. > > So you need an USRP2, for uplink/downlink you need two of them. The USRP provides 16MHz max. RF bandwidth IIRC. Thought that would be enough for most (900MHz-)BTSs. Maybe that was too optimistic, right. But one USRP2 just for channel hopping should be enough? If sniffing bidirectional, you will need two of them, right. Or you manage to mix the uplink channels you are intersted in into the downlink band you record. But thats quite epxerimental and depends on channel usage :) May work at home, but not everywhere. B.R. Georg ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
