The only solution I've found is picking a center frequency that is a multiple of 64MHz based on this reply by Matt
http://lists.gnu.org/archive/html/discuss-gnuradio/2008-06/msg00017.html Regards, AB ________________________________ From: Edwin Li <[email protected]> Sent: Friday, September 1, 2017 6:13:03 PM To: Bakshi, Arjun; [email protected] Subject: Re: [USRP-users] Changes in wired channel after restarting flowgraph Looks like there is a random phase. Every time you start, the phase of the clock maybe different. Hence when you plot the signal, it's going to be different. I can observe the same random phase in my BPSK program. Bakshi, Arjun via USRP-users <[email protected]<mailto:[email protected]>>于2017年9月1日周五 下午2:48写道： Hi all, Had posted about this before, but focusing on 1 simple case here. I'm observing a change in a wired channel every time I restart my flow graph. I'm using 1 USRP + WBX board, i.e. tx and rx on the same USRP. So time/frequency sync should not be a factor, I believe. I simply do: start-> sleep(2)-> stop->wait->start->sleep(2).... looped 10 times, and record the rxed signal. I see that during the 2 seconds the channel remains constant, however after the restart the channel changes. Any ideas on why this is happening? I was expecting to see the same channel no matter how many times I restart the flow or even power cycle the USRP. Figures attached: Real and imaginary part of rxed signal, subsampled ~110 to fit it all in. Thank you, Arjun _______________________________________________ USRP-users mailing list [email protected]<mailto:[email protected]> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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