Weber, Michael J. (US SSA) wrote: > Matt, can you elaborate on the 20MHz bandwidth figure for the Flex400 > and give some USRP application guidance? I have this "8MHz maximum > supportable bandwidth" figure in my head which I think came from the > sampling/decimation rates + USB2 throughput limitation discussed in the > USRP documentation..? Some folks have seen the release below and are > asking me if we can do XYZ in terms of bandwidth and I'm not sure what > to say at this point. > > Is there a way to move 20MHz-wide signals between the host machine and > the Flex400?
20 MHz bandwidth indicates the width of the baseband filters. Thus, you can tune digitally anywhere +/- 10 MHz from the LO. If you use 16 bit samples, you can't get that much over the USB bus at once. So why is 20 MHz useful? Here are 3 example scenarios: - You could simultaneously receive or transmit 2 separate signals which are 4 MHz wide each, which are separated by 12 MHz. - You can use 8 bit samples, and get 16 MHz of bandwidth. If you were a radio astronomer, you could use 4-bit samples and get 32 MHz of bandwidth. - You could do a wideband mod and demod in the FPGA. You would be able to deal with much wider signals, and send a lower bit rate over the bus. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
