Ah, that makes sense! Thanks for the clue-in. BTW, I didn't see your response come though the list... does the list engine not send one emails already cc'd to one?
Thanks, Mike > -----Original Message----- > From: Matt Ettus [mailto:[EMAIL PROTECTED] > Sent: Tuesday, December 06, 2005 4:51 PM > To: Weber, Michael J. (US SSA) > Cc: discuss gnuradio > Subject: Re: [Discuss-gnuradio] USRP Update > > > 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 Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
