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: Generating: "/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" Executing: "/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" linux; GNU C++ version 4.8.2; Boost_105500; UHD_003.008.002-135-ga393ec83 Using Volk machine: avx_64_mmx -- Opening a USRP2/N-Series device... -- Current recv frame size: 1472 bytes -- Current send frame size: 1472 bytes UHD Warning: The hardware does not support the requested RX sample rate: Target sample rate: 5000.000000 MSps Actual sample rate: 50.000000 MSps -- Tune Request: 2412.000000 MHz -- The RF LO does not support the requested frequency: -- Requested LO Frequency: 2412.000000 MHz -- RF LO Result: 2411.999389 MHz -- Attempted to use the DSP to reach the requested frequency: -- Desired DSP Frequency: -0.000611 MHz -- DSP Result: -0.000611 MHz -- Successfully tuned to 2412.000000 MHz -- 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.

Dear Nur Qalbi, There's two issues that I'd like to address separately: 1. RF LO warning 2. Sampling rate warning. 1. Shouldn't really be a warning, because, as the output says, in the end tuning is successful. The reason you're seeing this is UHD being a little verbose about how it tuned. Don't worry, things should work as expected. 2. Is much much more severe: you seem to have modified the flow graph to run at 5GS/s. That does neither technologically, physically nor mathematically make much sense - did you perhaps intend to tune to 5GHz RF frequency? Best regards, Marcus Am 30. Juli 2015 06:51:37 MESZ, schrieb nur qalbi via USRP-users <usrp-users@lists.ettus.com>: >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: > > >Generating: >"/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" > >Executing: >"/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" > >linux; GNU C++ version 4.8.2; Boost_105500; >UHD_003.008.002-135-ga393ec83 > >Using Volk machine: avx_64_mmx >-- Opening a USRP2/N-Series device... >-- Current recv frame size: 1472 bytes >-- Current send frame size: 1472 bytes > >UHD Warning: > The hardware does not support the requested RX sample rate: > Target sample rate: 5000.000000 MSps > Actual sample rate: 50.000000 MSps >-- Tune Request: 2412.000000 MHz >-- The RF LO does not support the requested frequency: >-- Requested LO Frequency: 2412.000000 MHz >-- RF LO Result: 2411.999389 MHz >-- Attempted to use the DSP to reach the requested frequency: >-- Desired DSP Frequency: -0.000611 MHz >-- DSP Result: -0.000611 MHz >-- Successfully tuned to 2412.000000 MHz >-- > >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. > > >------------------------------------------------------------------------ > >_______________________________________________ >USRP-users mailing list >USRP-users@lists.ettus.com >http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

On 07/30/2015 12:51 AM, nur qalbi via USRP-users 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: > > > Generating: > "/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" > > Executing: > "/home/userr/Downloads/gr-ieee802-11-master/examples/wifi_rx.py" > > linux; GNU C++ version 4.8.2; Boost_105500; > UHD_003.008.002-135-ga393ec83 > > Using Volk machine: avx_64_mmx > -- Opening a USRP2/N-Series device... > -- Current recv frame size: 1472 bytes > -- Current send frame size: 1472 bytes > > UHD Warning: > The hardware does not support the requested RX sample rate: > Target sample rate: 5000.000000 MSps > Actual sample rate: 50.000000 MSps > -- Tune Request: 2412.000000 MHz > -- The RF LO does not support the requested frequency: > -- Requested LO Frequency: 2412.000000 MHz > -- RF LO Result: 2411.999389 MHz > -- Attempted to use the DSP to reach the requested frequency: > -- Desired DSP Frequency: -0.000611 MHz > -- DSP Result: -0.000611 MHz > -- Successfully tuned to 2412.000000 MHz > -- > > 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. > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com The tuning warning is just giving you a running dialog of how it's attempting to satisfy your frequency request, shared between the RF LO, and the DSP subsystem in the FPGA. The other warning, about a sample rate of 5Gsps (5.0e9 sps) is more worrying. IF you need 50Msps, you can only achieve it with setting sc8 in the wire format, which would require changes to the program you're using, with which, I'm not familiar.