Got a weird one here. I'm using an X310 with UHD 3.14.0.0-87-g4e084337, with two LFRX daughterboards installed. Legacy interface with gr-uhd, not gr-ettus, just testing things in the field. When I tune to 15MHz sample rate at 1Msps, I get a resulting stream that looks for all the world like it's coming in at 7.5MHz and 500ksps. Because this is a field deployment, and because I don't have immediate access to a signal generator, it's a bit hard to confirm that. It looks to me (at first blush) like the DDC block is getting an incorrect master clock rate, and setting its tick rate accordingly. When I set the frequency to 30MHz and the sample rate to 2Msps, I get the result I'm expecting.
I don't believe I'm seeing the same problem with device3/gr-ettus, but I'll test that further today. Anyone seen behavior like this before? There's also an unexpected DC offset I haven't seen before, if that helps jog anyone's memory. Since it's direct-sampled, not zero-IF, any DC offset must be the result of the DSP chain. Nick
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
