Awesome, thanks a lot! On Fri, Mar 9, 2018 at 10:46 PM Marcus D. Leech <mle...@ripnet.com> wrote:
> On 03/10/2018 12:59 AM, Sailor Jerry wrote: > > 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. > > There is a ref_locked sensor, you can read it with get_mboard_sensor(): > > > https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a2d3c327bcb83fd274e05e3ca95d1ac95 > > The on-board clock is 2.5PPM. > > > > > 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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