[Discuss-gnuradio] USRP2 1pps synchronization delay

We are trying to determine how much delay there is between the 1pps pulse and when the samples come out properly time tagged. Using a GPS timing receiver we connected up the 10MHz clock and 1pps to the USRP2. The software is set up to reset on the next 1pps pulse. With a GPS software receiver we determined that there is a delay of 3 - 6 microseconds which curiously was 3 with a smaller decimation and 6 at a higher decimation. We've checked over the setup and can't find any reason for this. Does anyone have any ideas?

Thanks,

Cliff

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