On Sun, Jan 3, 2010 at 9:38 AM, Fabio Pietrosanti (naif) <[email protected]> wrote: > - USRP1 cannot be used to do the interception work
USRP1 can't capture and transmit to the PC a provider's full allocation. Depending on what you are intercepting this may or may not be enough. > - USRP2 can be used to do half-duplex of the interception (or RX or TX > channel) Don't ignore the non-trivial computer power required to keep up with two USRP2s. > - To do proper full-duplex interception two USRP2 would be required > - No software to synchronize the two streams for the two USRP2 has > been done (but it may be done?). I'm not aware of any reason that you would need to synchronize them for this application. However, if you need to they can be trivially synchronized by being fed from a clock and PPS input. > Regarding using 2 USRP2 (one for RX and one for TX) it should not be a > problem, the manufacturing costs of two of them (cloned) should be > very low. > With some thousands USD we could make a 1st hardware prototype of > USRP2 clone and then production costs should be less than some > hundreds USD. I think you may be under-estimating the fabrication costs of precision electronics at these operating frequencies. The COGS for the parts alone on a USRP2 will exhaust your budget of "some hundreds" very quickly. For example, the ADC on the USRP2 is almost $100 alone. I believe the FPGA is in the same general ballpark. I have no doubt that you could build something for GSM channel monitoring for much less than a USRP2 in parts costs, but that device would be a specialized device without too much resemblance to the usrp2. _______________________________________________ A51 mailing list [email protected] http://lists.lists.reflextor.com/cgi-bin/mailman/listinfo/a51
