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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