Hi all, I am seeing a quite strange pattern in an USRP B210, and I am trying to figure out what it is.
Right now this is more like an academic investigation, as this is not causing malfunctions, but it got my attention. So, from time to time I am seeing a tone (20dB above noise) appearing just in the middle of the band, to be precise ±2KHz around the central frequency that I configured in the USRP. I was not paying attention at all, until I noticed that it appears every day seven times a day, and always (more or less) at the same times. Hence, this is not random. Gut feeling is that this is caused by some sort of signal induced into the cables or locally radiated interference, not intended, of course. I was trying to further investigate, and for that I was trying to get a detail blocks diagram of the B210, as I saw the following information in the B210 website: "If you, however, happen to have a very strong interferer within half the master clock rate of your RX LO frequency, you might want to reduce this analog bandwidth. You can do so by calling uhd::usrp::multi_usrp::set_rx_bandwidth(bw)." B200/B210/B200mini/B205mini - Ettus Knowledge Base <https://kb.ettus.com/B200/B210/B200mini/B205mini#FAQ> Now the thing is, I realized I don't really know what the internal settings of the USRP are, also in terms of the Analog Devices AD9363. I know that the clock rate is 32 MHz, but from there I don't clearly know what is the LO frequency that the USRP set. Also, I would like to know the setting that the USRP is using for the Analog bandwidth. In short, I would like to: a) Get a diagram like this one, but for the detailed case of B210. Is there something like this? (File:2920 simplified system diagram.gif - Ettus Knowledge Base <https://kb.ettus.com/File:2920_simplified_system_diagram.gif>) b) Know what is the LO freq that the USRP is setting (I assumed based on the 32MHz clock rate) c) Know where I can get the information on the setting the USRP is putting for the analog bandwidth filter. Thanks! Fran
_______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
