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John Wilson john.wilson at pathintelligence.comIf you need to extract them all simultaneously then you'd need about 25 MHz baseband bandwidth, which I think at the moment is a bit more than the UmTRX can do on one channel, you might be able to do something clever and look across both channels maybe. That's a whole lot of processing as well, I'm guessing you'll be analyzing the signals offline? USRP2 or USRP N series and do about 25 MHz sustained on one channel, you'll need some good network hardware on your PC to prevent overruns. John On 17 June 2013 10:23, Albert-Miquel Sánchez <albertm at salleurl.edu> wrote: > Hello,**** > > I’m an engineer from Spain and I’m interested in a GSM receiver because I > would like to study the internal signals for a research project. In > particular, I’m interested in the analysis of the IF signal, but, as > Alexander told me, the LMS6002D uses zero-IF architecture, so there is no > real "IF" signal, there is only baseband signal. I guess I could also use > this signal for my purposes, but only if all 124 GSM channels can be found > at that point. I’m not sure if this is possible, since there is a low-pass > filter before. Does anybody know if I can extract that information, that > is, the analogic 124 channels after the RF mixer? If it is not possible > with this board, does anybody know if I can do it with another GSM > transceiver board?**** > > Thank you very much in advance.**** > > Best regards,**** > > Albert**** > -- *Dr. John Wilson* Product development engineer, Path Intelligence<http://www.pathintelligence.com/> T +44 2392 388442 @pathintel DETECT • ANALYSE • PREDICT • INFLUENCE Path Intelligence Limited, registered number 5176274. Registered in England, registered office at 1000 Lakeside North Harbour, Western Road, Portsmouth, UK, PO6 3EN -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/umtrx/attachments/20130617/ae6678fb/attachment.htm>