Thanks a lot Nick, is there way to find out if the PLL is locked or not? Can it be done via SW or I need to probe MUXOUT of U101. What should I see there?
The reason I need to know it, I want to make sure I'm locked to external 10 MHz. Now for some reasons I see the input tone few tens of KHz off from where I expect to see it. On Fri, Mar 9, 2018 at 9:52 PM Nick Foster <bistrom...@gmail.com> wrote: > Without an external reference, the onboard 40MHz VCTCXO will handle > creating a decent reference without the benefit of the PLL locking it to a > 10MHz reference. Wouldn't be much use otherwise. > > On Fri, Mar 9, 2018, 9:46 PM Sailor Jerry <sailorje...@scmarinetech.com> > wrote: > >> Guys, thank you so much for your support, you are awesome! >> >> Now I feel myself as complete idiot. I removed GPSDO. Disconnected the >> 10MHz clock, by USRP is still working and it seems to be on more or less >> correct correct frequency. I clearly can see the input tone on fft utility. >> >> Is there some other clock source I'm unaware off? Can I see the ADF4001 >> lock status? Here is the output I'm getting: >> linux; GNU C++ version 5.3.1 20151219; Boost_105800; >> UHD_003.009.002-0-unknown >> >> -- Loading firmware image: /usr/share/uhd/images/usrp_b200_fw.hex... >> -- Detected Device: B210 >> -- Loading FPGA image: /usr/share/uhd/images/usrp_b210_fpga.bin... >> -- Operating over USB 3. >> -- Detecting internal GPSDO.... No GPSDO found >> -- Initialize CODEC control... >> -- Initialize Radio control... >> -- Performing register loopback test... pass >> -- Performing register loopback test... pass >> -- Performing CODEC loopback test... pass >> -- Performing CODEC loopback test... pass >> -- Asking for clock rate 16.000000 MHz... >> -- Actually got clock rate 16.000000 MHz. >> -- Performing timer loopback test... pass >> -- Performing timer loopback test... pass >> -- Setting master clock rate selection to 'automatic'. >> -- Asking for clock rate 32.000000 MHz... >> -- Actually got clock rate 32.000000 MHz. >> -- Performing timer loopback test... pass >> -- Performing timer loopback test... pass >> >> >> >> >> On Fri, Mar 9, 2018 at 9:09 PM Sailor Jerry <sailorje...@scmarinetech.com> >> wrote: >> >>> That would explain it , thanks :-) >>> >>> On Fri, Mar 9, 2018 at 9:07 PM Nick Foster <bistrom...@gmail.com> wrote: >>> >>>> I uh what? I don't see why that would be the case. The whole reason >>>> U103 exists is to switch between a GPSDO (if present) and an external >>>> reference. >>>> >>>> You might wait for the official Ettus response for this if you don't >>>> want to take responsibility for blowing it up, but I drew the schematic and >>>> I say you're fine. >>>> >>>> Incidentally, very early prototypes of the B200 used a neat PIN diode >>>> switch ring which would allow outputting the GPSDO signal as well as using >>>> either the reference port or GPSDO as a clock input. I can't remember why >>>> it didn't make it into production, but one side effect would be that if >>>> misconfigured, you could damage hardware. Maybe that was it. ;) >>>> >>>> Nick >>>> >>>> On Fri, Mar 9, 2018 at 8:48 PM Marcus D. Leech <mle...@ripnet.com> >>>> wrote: >>>> >>>>> On 03/09/2018 11:44 PM, Sailor Jerry wrote: >>>>> >>>>> Thanks. Shall I ignore that sentence from USRP B2x0 Series manual "The >>>>> B200 and B210 cannot support an external 10 MHz reference if a GPSDO is >>>>> already present on the motherboard. If an external 10 MHz is to be used, >>>>> the GPSDO needs to be physically removed from the device beforehand."? >>>>> >>>>> >>>>> I think that advice is still correct, but I cannot remember why. Nick? >>>>> >>>>> >>>>> >>>>> >>>>> On Fri, Mar 9, 2018 at 8:32 PM Marcus D. Leech <mle...@ripnet.com> >>>>> wrote: >>>>> >>>>>> On 03/09/2018 11:25 PM, Sailor Jerry wrote: >>>>>> >>>>>> Would be happy to restore it to original condition :-) >>>>>> >>>>>> I'm using the uhd_rx_cfile to capture the data. How do I control U103 >>>>>> from this app? I don't see any command line arguments for that? Do I need >>>>>> to rebuild it? >>>>>> >>>>>> You'd have to add that, inserting a call to set_clock_source() at an >>>>>> appropriate place. >>>>>> >>>>>> The example apps (and this is one) don't necessarily expose all >>>>>> available features. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Mar 9, 2018 at 8:08 PM Marcus D. Leech via USRP-users < >>>>>> usrp-users@lists.ettus.com> wrote: >>>>>> >>>>>>> On 03/09/2018 08:11 PM, Nick Foster wrote: >>>>>>> >>>>>>> It's a slick mod though. See the zero-ohm resistor bridging U103 >>>>>>> pins 1 and 3? Remove it, and you'll return the B210 to factory standard. >>>>>>> >>>>>>> Assuming no other modifications have also been made. =) >>>>>>> >>>>>>> Nick >>>>>>> >>>>>>> Your eyes are much better than mine.... >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Fri, Mar 9, 2018 at 4:31 PM Marcus D. Leech via USRP-users < >>>>>>> usrp-users@lists.ettus.com> wrote: >>>>>>> >>>>>>>> On 03/09/2018 07:22 PM, Sailor Jerry via USRP-users wrote: >>>>>>>> >>>>>>>> HI Marcus, I see your point and also saw the schematic. The >>>>>>>> previous owner told me that this particular board was modified to have >>>>>>>> 10 >>>>>>>> MHz be brought out to the outside connector. I did verify it with the >>>>>>>> scope >>>>>>>> and indeed saw the 10 MHz coming out. I don't know if it's one of the >>>>>>>> standard factory options or just some custom modifications (the board >>>>>>>> has >>>>>>>> Olifantasia label on it). Will take a closer look at pins 3 and 1 of >>>>>>>> U103 >>>>>>>> as you suggest. If they are bridged indeed then I guess simple >>>>>>>> removal of >>>>>>>> GPSDO would do the trick. >>>>>>>> >>>>>>>> >>>>>>>> That is NOT a factory-standard option. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Fri, Mar 9, 2018 at 4:10 PM Marcus Müller < >>>>>>>> marcus.muel...@ettus.com> wrote: >>>>>>>> >>>>>>>>> Dear Sailor Jerry, >>>>>>>>> >>>>>>>>> I'm not sure I'm following here: The 10 MHz connector is >>>>>>>>> hardware-wise >>>>>>>>> connected only to inputs, not to anything that can output anything; >>>>>>>>> compare the schematic[1] on page 1. So, I'm pretty certain your >>>>>>>>> device >>>>>>>>> can't be condigured to have the 10 MHz connector be an output for >>>>>>>>> anything. >>>>>>>>> >>>>>>>>> Can you maybe describe the problem you're having? >>>>>>>>> >>>>>>>>> Best regards, >>>>>>>>> Marcus >>>>>>>>> >>>>>>>>> [1] https://files.ettus.com/schematics/b200/b210.pdf >>>>>>>>> On Fri, 2018-03-09 at 23:51 +0000, Sailor Jerry via USRP-users >>>>>>>>> wrote: >>>>>>>>> > I inherited the B210 board that has the 10 MHz connector >>>>>>>>> configured >>>>>>>>> > as an output. I wonder if anyone is aware of this configuration >>>>>>>>> and >>>>>>>>> > if it's possible to reconfigure it to accept the external 10 MHz >>>>>>>>> > input. >>>>>>>>> > >>>>>>>>> > My current plan is simply remove GPSDO and hope for the best. >>>>>>>>> > >>>>>>>>> > Attached are two pictures of my board. One is with GPSDO >>>>>>>>> inserted and >>>>>>>>> > another one with GPSDO removed. >>>>>>>>> > >>>>>>>>> > Thanks a lot! >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> > _______________________________________________ >>>>>>>>> > USRP-users mailing list >>>>>>>>> > USRP-users@lists.ettus.com >>>>>>>>> > >>>>>>>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> USRP-users mailing >>>>>>>> listUSRP-users@lists.ettus.comhttp://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 >>>>>>> >>>>>> >>>>>> >>>>>
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