[USRP-users] The RF LO does not support the requested frequency

Marcus D. Leech mleech at ripnet.com
Thu Jul 30 08:28:55 EDT 2015


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.
>
>
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> USRP-users at 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.


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