Hi all, I looked at this thread and it reminded me of something.
Once we purchased few X310 with UBX160 daughter-boards. One of them had some frequency offset on Tx channel, that decreased over time it was running, but very slowly. The daughter-board was then replaced by National Intruments (after some adventures ;) ). The replacement one had exactly the same issue so it was also replaced. The next one was ok. So it seemed it was some manufacturing issue with UBX. I don't know if it's the same issue (i.e. due to lack of data), but I attach part of the report that was sent to National Instruments: -phase offset of the received signal in relation to digital waveform for a single X310 with UBX160 for all TX and RX combinations: https://imgur.com/a/ODBtT4o -schematic: https://imgur.com/a/si9fJZp I got also scripts that were used for recording and plotting that figure. If you are interested I can post it somewhere. What seems different from situation here is that for us it seemed the effect wasn't depending on frequency (but I didn't do any extensive tests and might not remember). -- Best Regards, Piotr Krysik W dniu 07.04.2019 o 03:00, Freedman, Michael - 1008 - MITLL via USRP-users pisze: > I have switched and am currently running the release 3.14.0.0 > > Sent from my iPhone > > On Apr 6, 2019, at 8:58 AM, Marcus D. Leech <patchvonbr...@gmail.com > <mailto:patchvonbr...@gmail.com>> wrote: > > On 04/05/2019 11:43 AM, Michael R. Freedman wrote: >> >> Hello, >> >> >> If I remove the DSP from the equation by setting the DSP tuning >> policy to manual and assigning it to zero, I am coherent from tx to >> rx on all frequencies. I'm now beginning to think that the DSP is >> doing it's tuning differently for tx and rx. Or there is an >> accumulated error in opposite directions for both. Thoughts? >> >> >> Leaving the DSP to zero is not a good solution however as there is >> too much LO leakage. >> >> > Could you try UHD 3.14.0.0? > > I think that you're using the -rc3 version at the moment. > > >> Mike >> >> >> On 03/27/2019 04:58 PM, Marcus D. Leech wrote: >>> On 03/27/2019 04:48 PM, Michael R. Freedman wrote: >>>> >>>> This is on a single UBX card within a single USRP. >>>> >>>> >>>> ./uhd_usrp_probe --args=addr=192.168.40.100 >>>> [INFO] [UHD] linux; GNU C++ version 7.3.0; Boost_106501; >>>> UHD_3.14.0.0-0-unknown >>>> [INFO] [X300] X300 initialization sequence... >>>> [INFO] [X300] Maximum frame size: 8000 bytes. >>>> [INFO] [X300] Radio 1x clock: 200 MHz >>>> [INFO] [0/DmaFIFO_0] Initializing block control (NOC ID: >>>> 0xF1F0D00000000000) >>>> [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1320 MB/s) >>>> [INFO] [0/DmaFIFO_0] BIST passed (Throughput: 1294 MB/s) >>>> [INFO] [0/Radio_0] Initializing block control (NOC ID: >>>> 0x12AD100000000001) >>>> [INFO] [0/Radio_1] Initializing block control (NOC ID: >>>> 0x12AD100000000001) >>>> [INFO] [0/DDC_0] Initializing block control (NOC ID: >>>> 0xDDC0000000000000) >>>> [INFO] [0/DDC_1] Initializing block control (NOC ID: >>>> 0xDDC0000000000000) >>>> [INFO] [0/DUC_0] Initializing block control (NOC ID: >>>> 0xD0C0000000000000) >>>> [INFO] [0/DUC_1] Initializing block control (NOC ID: >>>> 0xD0C0000000000000) >>>> _____________________________________________________ >>>> / >>>> | Device: X-Series Device >>>> | _____________________________________________________ >>>> | / >>>> | | Mboard: X310 >>>> | | revision: 6 >>>> | | product: 30410 >>>> | | mac-addr0: 00:80:2f:0a:ff:98 >>>> | | mac-addr1: 00:80:2f:0a:ff:99 >>>> | | gateway: 192.168.10.1 >>>> | | ip-addr0: 192.168.10.100 >>>> | | subnet0: 255.255.255.0 >>>> | | ip-addr1: 192.168.20.100 >>>> | | subnet1: 255.255.255.0 >>>> | | ip-addr2: 192.168.30.100 >>>> | | subnet2: 255.255.255.0 >>>> | | ip-addr3: 192.168.40.100 >>>> | | subnet3: 255.255.255.0 >>>> | | serial: F5BE45 >>>> | | FW Version: 6.0 >>>> | | FPGA Version: 35.1 >>>> | | FPGA git hash: 4c165a5 >>>> | | RFNoC capable: Yes >>>> | | >>>> | | Time sources: internal, external, gpsdo >>>> | | Clock sources: internal, external, gpsdo >>>> | | Sensors: ref_locked >>>> | | _____________________________________________________ >>>> | | / >>>> | | | RX Dboard: A >>>> | | | ID: UBX-40 v2 (0x007c) >>>> | | | Serial: 313C181 >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | RX Frontend: 0 >>>> | | | | Name: UBX RX >>>> | | | | Antennas: TX/RX, RX2, CAL >>>> | | | | Sensors: lo_locked >>>> | | | | Freq range: 10.000 to 6000.000 MHz >>>> | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB >>>> | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz >>>> | | | | Connection Type: IQ >>>> | | | | Uses LO offset: No >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | RX Codec: A >>>> | | | | Name: ads62p48 >>>> | | | | Gain range digital: 0.0 to 6.0 step 0.5 dB >>>> | | _____________________________________________________ >>>> | | / >>>> | | | RX Dboard: B >>>> | | | ID: UBX-40 v2 (0x007c) >>>> | | | Serial: 313C191 >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | RX Frontend: 0 >>>> | | | | Name: UBX RX >>>> | | | | Antennas: TX/RX, RX2, CAL >>>> | | | | Sensors: lo_locked >>>> | | | | Freq range: 10.000 to 6000.000 MHz >>>> | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB >>>> | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz >>>> | | | | Connection Type: IQ >>>> | | | | Uses LO offset: No >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | RX Codec: B >>>> | | | | Name: ads62p48 >>>> | | | | Gain range digital: 0.0 to 6.0 step 0.5 dB >>>> | | _____________________________________________________ >>>> | | / >>>> | | | TX Dboard: A >>>> | | | ID: UBX-40 v2 (0x007b) >>>> | | | Serial: 313C181 >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | TX Frontend: 0 >>>> | | | | Name: UBX TX >>>> | | | | Antennas: TX/RX, CAL >>>> | | | | Sensors: lo_locked >>>> | | | | Freq range: 10.000 to 6000.000 MHz >>>> | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB >>>> | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz >>>> | | | | Connection Type: QI >>>> | | | | Uses LO offset: No >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | TX Codec: A >>>> | | | | Name: ad9146 >>>> | | | | Gain Elements: None >>>> | | _____________________________________________________ >>>> | | / >>>> | | | TX Dboard: B >>>> | | | ID: UBX-40 v2 (0x007b) >>>> | | | Serial: 313C191 >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | TX Frontend: 0 >>>> | | | | Name: UBX TX >>>> | | | | Antennas: TX/RX, CAL >>>> | | | | Sensors: lo_locked >>>> | | | | Freq range: 10.000 to 6000.000 MHz >>>> | | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB >>>> | | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz >>>> | | | | Connection Type: QI >>>> | | | | Uses LO offset: No >>>> | | | _____________________________________________________ >>>> | | | / >>>> | | | | TX Codec: B >>>> | | | | Name: ad9146 >>>> | | | | Gain Elements: None >>>> | | _____________________________________________________ >>>> | | / >>>> | | | RFNoC blocks on this device: >>>> | | | >>>> | | | * DmaFIFO_0 >>>> | | | * Radio_0 >>>> | | | * Radio_1 >>>> | | | * DDC_0 >>>> | | | * DDC_1 >>>> | | | * DUC_0 >>>> | | | * DUC_1 >>>> >>>> >>>> >>>> Mike >>>> >>> OK, so could you use the tx_waveforms example in multi-channel mode >>> and confirm correct output on a spectrum analyser, >>> or another X310 doing receive? >>> >>> >>>> >>>> >>>> On 03/27/2019 03:42 PM, Marcus D. Leech via USRP-users wrote: >>>>> On 03/27/2019 03:39 PM, Michael R. Freedman via USRP-users wrote: >>>>>> >>>>>> Marcus, >>>>>> >>>>>> >>>>>> I tried a 10MHz LOOffset with no change. I also tried it at >>>>>> 1155.0MHz and 1160.0MHz. At 1155 the phase rolls... at 1160 it >>>>>> does not. >>>>>> >>>>>> >>>>>> Mike >>>>>> >>>>> Could you give us a dump of uhd_usrp_probe for an X310 that >>>>> displays this issue? What version of UHD? Also, to be clear, >>>>> this is within >>>>> a *single* X310, correct? >>>>> >>>>> >>>>>> >>>>>> On 03/27/2019 11:10 AM, Marcus D. Leech via USRP-users wrote: >>>>>>> On 03/27/2019 10:41 AM, Michael R. Freedman via USRP-users wrote: >>>>>>>> >>>>>>>> Any thoughts on this? >>>>>>>> >>>>>>>> >>>>>>>> Mike >>>>>>>> >>>>>>> Given that in this case, the incoming carrier will be fighting >>>>>>> DC-offset removal rather hard, I wonder if this is a weird >>>>>>> artifact of DC-offset >>>>>>> removal? >>>>>>> >>>>>>> If you use offset tuning on the RX, do you still see a >>>>>>> significant phase roll? >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> On 03/25/2019 01:04 PM, Michael R. Freedman via USRP-users wrote: >>>>>>>>> >>>>>>>>> Marcus, >>>>>>>>> >>>>>>>>> 190Hz is what we calculated. I have attached a text file >>>>>>>>> with the data we used. This is a single UBX40 tuned to 155MHz >>>>>>>>> sampling at 2MHz. >>>>>>>>> >>>>>>>>> >>>>>>>>> Mike >>>>>>>>> >>>>>>>>> >>>>>>>>> On 03/25/2019 12:34 PM, Nick Foster wrote: >>>>>>>>>> Well, according to your description, you could transmit a >>>>>>>>>> carrier from TX to RX (through an attenuator) with both sides >>>>>>>>>> set to the same frequency. Your received signal should look >>>>>>>>>> like a sine wave at the frequency of the offset. >>>>>>>>>> >>>>>>>>>> On Mon, Mar 25, 2019 at 9:16 AM Michael R. Freedman via >>>>>>>>>> USRP-users <usrp-users@lists.ettus.com >>>>>>>>>> <mailto:usrp-users@lists.ettus.com>> wrote: >>>>>>>>>> >>>>>>>>>> Hello, >>>>>>>>>> >>>>>>>>>> Do you have any suggestions as to how to measure the >>>>>>>>>> frequency delta between the transmit channel and the >>>>>>>>>> receive channel? >>>>>>>>>> >>>>>>>>>> As I sat down to do this, I realized I have no real way >>>>>>>>>> to do that. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Mike >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On 03/24/2019 03:23 PM, Marcus D. Leech via USRP-users wrote: >>>>>>>>>>> On 03/24/2019 02:39 PM, Freedman, Michael - 1008 - MITLL >>>>>>>>>>> via USRP-users wrote: >>>>>>>>>>>> It is not just a phase offset. It is a frequency offset. The >>>>>>>>>>>> phase drifts between the two. I can tolerate a phase offset at >>>>>>>>>>>> startup. A freq offset however is causing problems. >>>>>>>>>>>> >>>>>>>>>>>> Mike >>>>>>>>>>>> >>>>>>>>>>>> Sent from my iPhone >>>>>>>>>>>> >>>>>>>>>>>> On Mar 24, 2019, at 4:28 AM, Marcus Müller >>>>>>>>>>>> <marcus.muel...@ettus.com> <mailto:marcus.muel...@ettus.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>> Can you elaborate on what "not coherent" means to you – the >>>>>>>>>>>> relative >>>>>>>>>>>> phase should be constant after each tune, but if you don't tune >>>>>>>>>>>> simultaneously, i.e. with timed commands, random at each tune. >>>>>>>>>>>> >>>>>>>>>>>> Best regards, >>>>>>>>>>>> Marcus >>>>>>>>>>> Also, what version of UHD? What hardware rev of UBX cards? >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> On Sat, 2019-03-23 at 17:06 -0400, Michael R. Freedman via >>>>>>>>>>>> USRP-users >>>>>>>>>>>> wrote: >>>>>>>>>>>>> Hello, >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> I have an issue where I tune both the TX and RX side of a >>>>>>>>>>>>> UBX40 card >>>>>>>>>>>>> in >>>>>>>>>>>>> an X310 to the same frequency and find that the transmitted >>>>>>>>>>>>> signal >>>>>>>>>>>>> and >>>>>>>>>>>>> what is received are not coherent. I am using an external >>>>>>>>>>>>> 10MHz >>>>>>>>>>>>> reference and have tried the documented suggestions. >>>>>>>>>>>>> >>>>>>>>>>>>> at 150MHz it is coherent. >>>>>>>>>>>>> >>>>>>>>>>>>> at 155MHz it is NOT coherent. >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> I have tried setting the dboard_clock_rate to 20MHz. This >>>>>>>>>>>>> made the >>>>>>>>>>>>> problem appear at 150MHz as well. I've tried integer_n >>>>>>>>>>>>> tuning. >>>>>>>>>>>>> >>>>>>>>>>>>> I have verified that the ref_lock and lo_lock are both true. >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> Any suggestions? >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> Mike >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>>> USRP-users mailing list >>>>>>>>>>>>> USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> >>>>>>>>>>>>> >>>>>>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> _______________________________________________ >>>>>>>>>>>> USRP-users mailing list >>>>>>>>>>>> USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> >>>>>>>>>>>> >>>>>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> USRP-users mailing list >>>>>>>>>>> USRP-users@lists.ettus.com <mailto:USRP-users@lists.ettus.com> >>>>>>>>>>> >>>>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>>>> >>>>>>>>>> _______________________________________________ >>>>>>>>>> USRP-users mailing list >>>>>>>>>> USRP-users@lists.ettus.com >>>>>>>>>> <mailto:USRP-users@lists.ettus.com> >>>>>>>>>> >>>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> USRP-users mailing list >>>>>>>>> USRP-users@lists.ettus.com >>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> USRP-users mailing list >>>>>>>> USRP-users@lists.ettus.com >>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> USRP-users mailing list >>>>>>> USRP-users@lists.ettus.com >>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> USRP-users mailing list >>>>>> USRP-users@lists.ettus.com >>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> USRP-users mailing list >>>>> USRP-users@lists.ettus.com >>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>> >>> >> _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
