On Thu, Jul 30, 2015 at 4:26 AM, Daniele Nicolodi <[email protected]> wrote:
> On 30/07/15 05:06, Nur Jalaudin wrote: > > hi. i am using ubuntu 14.04 and i am trying run wifi_rx.grc.when i try > > run this wifi_rx.grc it comes out with this: > > [snip] > > > UHD Warning: > > The hardware does not support the requested RX sample rate: > > Target sample rate: 5000.000000 MSps > > Actual sample rate: 50.000000 MSps > > [snip] > > > UHD Warning: > > The total sum of rates (50.000000 MSps on 1 channels) exceeds the > > maximum capacity of the connection. > > This can cause overflows (O). > > O > >>>> Done > > > > what should i do. i hope you can help me. > > Hello, > > what about reading and trying to understand the warning to obtain? > > The first warning says that you requested a sampling rate of 5000 MSps, > or 5 GHz (!?!), which is obviously far higher that what the ADC can do, > I believe that there is no ADC that can sample at 5 GSps (if there is > one I would be very interested in getting one). The driver therefore > clamps your sample rate request to 50 MSps (which is the maximum > supported by your hardware). > The TI LM97600 supports sampling at 5 GSPS. http://www.ti.com/product/lm97600 and it's available at Digikey for only $325 in singles. 292 pin BGA package, so not something you'll deadbug onto a board. > The second warning is about the data transmission from the USRP (you do > not say, but from this message I believe it is an U2x0, with an USB > connection) to the host computer. The driver warns you that the > requested sampling rate (the 50 MSps from above), while supported by the > acquisition hardware, generates a volume of data that cannot be > transferred through the connection and that this will cause overflows. > Indeed this is what you obtain, as indicated by the 'O' that follows on > the output. > > Are you sure you want a sampling rate of 5 GSps? > > Cheers, > Daniele > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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