Re: [Discuss-gnuradio] continuous data collection?

[Matt Ettus]

Clark Pope wrote:
> I've been collecting snapshots through my DBS and USRP to do DBPSK and
> DQPSK bit error rate testing. I'm not able to get the BER below about
> 1e-5. It seems that slips are occuring spontaneously in the data even
> though no over/underflow is reported during the collection.
> 
> Questions:
> 1. Has anyone successfully done long term collections without any slips?
> 2. Are the O/U flags sticky?, i.e. if I don't see an under or overflow
> reported then I can be sure the fifos were okay?
> 
> I've done BERs from 1 Mbaud to 11 Mbaud all with the same frequency of
> slips so it does not appear to be speed related.

Do the errors occur at uniform intervals?

This may actually be internal to GNU Radio.  Can you try demodulating a
signal which is generated in GNU Radio?  You should have no hardware in
the chain at all.  This will help tell us where the problem is.

Thanks,
Matt