[USRP-users] rx_samples_to_file and B200

Weaver, Tyler tweaver at lgsinnovations.com
Tue Apr 28 10:38:35 EDT 2015

A bit more detail on my problem.  I can run the benchmark program (at the same rates, settings, etc) without trouble however the rx_samples_to_file (and my own software that is similar) generates these errors.  sc16 runs without errors yet when I set the wire format to sc8 I get the bad vrt header error.  What could be causing this?

thank you,

On Apr 27, 2015, at 10:38 AM, Weaver, Tyler <tweaver at lgsinnovations.com<mailto:tweaver at lgsinnovations.com>> wrote:

I’ve noticed the same thing.  I’ve even tried this on three separate computers all with USB controllers that “should” work.  The sc8 wire format seems to generate this bad packet error consistently along with some overflow errors whereas the sc16 format generates the packet error less often with more overflows.



Hi Marcus,

Plugging in a power source didn't help either. So now I'm trying to decrease the USB bit rate by using the sc8 format instead of the sc16 (50% saving). Here is my command:
./rx_samples_to_file --file=/tmp/cap.bin --time=10 --rate=15.36e6 --freq=739e6 --gain 70 --args="master_clock_rate=30.72e6" --stats --wirefmt=sc8

But I'm getting the following error now immediately.

UHD Error:
    The receive packet handler caught an exception.
    ValueError: bad vrt header or packet fragment
Error: Receiver error: ERROR_CODE_BAD_PACKET

What am I doing wrong?



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