Re: [USRP-users] UBX vs SBX
I found that UBX has a bit less of spurs. I assume it is because the whole daughterboard is covered by heatsink panel that plays a role of EMI shield while SBX is open. thanks, Dmitry From: Hojoon Yang via USRP-users Sent: 14 марта 2018 г. 9:23 To: usrp-users@lists.ettus.com Subject: [USRP-users] UBX vs SBX Hi. I have two USRP X310s and wonder which board between SBX and UBX would be the suitable for me. I'm gonna buy four daughterboards to use it as 2x2 MIMO. One USRP X310 for Tx, the other USRP for Rx. My target frequency is from 1.8GHz to 2.8GHz. According to datasheet, Both UBX and SBX work on the target frequency. I saw the schematic of both SBX and UBX and figured it out that UBX has a significantly different structure from SBX. I wonder, which board performs better "in the target frequency" in terms of MIMO performance(i.e. phase align accuracy, noise level, etc..). I don't have price issue. If the UBX performs better or same as the SBX in target frequency(1.8GHz~2.8GHz), I would like to buy UBX since it has more wide frequency range. Regards, ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Re: [USRP-users] uhd_cal Aborted (core dump)
I also had that issue. None of calibration utility worked. At the end of the procedure they were all aborted. As a workaround I replaced threads.interrupt_all() and boost::this_thread::interruption_requested() to just set/get boolean flag. Perhaps it has something to do with boost. thanks, Dmitry From: Louis Brown via USRP-users Sent: 12 января 2018 г. 2:04 To: usrp-users@lists.ettus.com Subject: [USRP-users] uhd_cal Aborted (core dump) I have a UBX160 in an X310 I'm attempting to calibrate. It crashes at the end and never writes the cal files in ~/.uhd. Does this for all 3 cal routines; TX IQ, RX, IQ, and TX DC. Does it on two separate X310 on two separate machines. Any idea what's wrong? For reference: https://github.com/EttusResearch/uhd/blob/maint/host/utils/uhd_cal_rx_iq_balance.cpp Thanks, Lou uhd_cal_rx_iq_balance --verbose --args "addr=192.168.40.2" --freq_start=1.60E9 --freq_stop=1.61E9 linux; GNU C++ version 7.2.1 20170915 (Red Hat 7.2.1-2); Boost_106400; UHD_003.010.002.000-3-g122bfae1 Creating the usrp device with: addr=192.168.40.2... -- X300 initialization sequence... -- Determining maximum frame size... 8000 bytes. -- Setup basic communication... -- Loading values from EEPROM... -- Setup RF frontend clocking... -- Radio 1x clock:200 -- Detecting internal GPSDO Found an internal GPSDO: LC_XO, Firmware Rev 0.929a -- [DMA FIFO] Running BIST for FIFO 0... pass (Throughput: 1304.6MB/s) -- [DMA FIFO] Running BIST for FIFO 1... pass (Throughput: 1304.5MB/s) -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- [RFNoC Radio] Performing register loopback test... pass -- Performing timer loopback test... pass -- Performing timer loopback test... pass -- Running calibration for UBX TX -- Daughterboard serial: 30891B2 -- Calibration frequency range: 1600 MHz -> 1610 MHz RX IQ: 1600.00 MHz: best suppression 87.490202 dB, corrected 37.821619 dB RX IQ: 1607.301587 MHz: best suppression 93.060566 dB, corrected 43.052988 dB terminate called without an active exception Aborted (core dumped) Last couple of entries in the /tmp/uhd.log: -- 2018-Jan-11 16:41:45.871915 - level 6 -- virtual void uhd::rfnoc::radio_ctrl_impl::issue_stream_cmd(const uhd::stream_ -- lib/rfnoc/radio_ctrl_impl.cpp:246 [0/Radio_1] radio_ctrl_impl::issue_stream_cmd() 0 d -- 2018-Jan-11 16:41:45.871927 - level 6 -- virtual void uhd::rfnoc::radio_ctrl_impl::issue_stream_cmd(const uhd::stream_ -- lib/rfnoc/radio_ctrl_impl.cpp:248 [0/Radio_1] radio_ctrl_impl::issue_stream_cmd() called on inactive channel. Skipping. ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
