Re: [Discuss-gnuradio] UHD warning: The Hardware does not support the requested RX sample rate

[Marcus D. Leech]

On 13/01/12 10:35 AM, Jorge Hernandez wrote:
> Hi,
>
> I am working on a SISO link between two USRP2 based on OFDM. After
> trying the different examples available I am stuck on a warning that
> comes up over and over and I don't know how to solve it. I know it can
> be a pretty simple question but I've already checked the mailing list
> and I saw that the typical warning experimented by other people is due
> to the fact that they have an error in the configuration of the sample
> rate. It's my understanding that only integer divisor rates of the
> master clock is possible. (100Mhz/decimation = sample rate). Well, I
> think that my problem is not this one, because I am using a frequency
> of 1M. This is happening only in the transmitter side, in the receiver
> USRP2 I don't get any problem with the same sample rate configuration.
> I don't know if it is a hardware problem or it is maybe a
> compatibility problem. I'd really appreciate your help! Thank you in
> advance.
>
> This is the message shown in the terminal:
>
> linux; GNU C++ version 4.4.1 [gcc-4_4-branch revision 150839];
> Boost_103900; UHD_003.003.000-283ff97
>
> Payload length:    1500
> Time out:    0.8
> Burst length:    15
> Modulation:    qpsk
> Output sink:    file
> Trellis coding:    False
> Protocol type:    selective_repeat
>
> -- 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: 1.000000 MSps
>     Actual sample rate: 0.000512 MSps
>
> Jorge Hernandez.
>   
Hmm, that's very odd.  Are you using custom FPGA/firmware on the USRP2,
or the standard, as-shipped
  FPGA/firmware?

What happens if you do a:

uhd_usrp_probe --args "addr=<address>"




-- 
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org