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Re: [Discuss-gnuradio] UHD warning: The Hardware does not support the re
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] UHD warning: The Hardware does not support the requested RX sample rate |
Date: |
Fri, 13 Jan 2012 10:55:24 -0500 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
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