UHD warning: The Hardware does not support the requested RX sample rate

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 H…

On 13/01/12 10:35 AM, Jorge H. wrote:

think that my problem is not this one, because I am using a frequency

– 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 H…

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=”


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

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