I think we may have found a batch of e310s a few years ago (circa summer 2017 iirc?) that had bad oscillators and were traced back to the TCXO manufacturer.
I don't remember the exact symptoms off the top of my head but those discrete frequency jumps look a little familiar EJ On Tue, Nov 24, 2020, 2:49 PM Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 11/24/2020 02:38 PM, Luke Whittlesey wrote: > > I'm in the process, but it's a lengthy process. There is something > > messed up with the C API in 3.15, so it doesn't work for me as a > > simple drop in replacement. Would it be wise to try to jump straight > > to 4.0? > The jump to 4.0 might be more traumatic. > > > > On Tue, Nov 24, 2020 at 2:40 PM Marcus D Leech <patchvonbr...@gmail.com> > wrote: > >> R&D suggest updating to a UHD 3.15 environment first. > >> > >> Sent from my iPhone > >> > >>> On Nov 24, 2020, at 1:54 PM, Luke Whittlesey < > luke.whittle...@gmail.com> wrote: > >>> > >>> I'm seeing this on two E310s that are a few years old. I just swapped > >>> the sd card into a brand-new E310 and I am NOT seeing the frequency > >>> jumps. So, same exact software, but different aged E310s. Is there > >>> possibly a difference in hardware leading to this? > >>> > >>>> On Tue, Nov 24, 2020 at 1:04 PM Luke Whittlesey > >>>> <luke.whittle...@gmail.com> wrote: > >>>> > >>>> I would say they are proportional to frequency. Attached is what it > >>>> looks like at 5GHz. There are jumps of 400Hz and 220Hz. > >>>> > >>>>> On Tue, Nov 24, 2020 at 11:50 AM Marcus D Leech < > patchvonbr...@gmail.com> wrote: > >>>>> > >>>>> Try at lower and higher frequencies—are the jumps the same or > proportional to frequency? > >>>>> > >>>>> Sent from my iPhone > >>>>> > >>>>>> On Nov 24, 2020, at 11:27 AM, Luke Whittlesey via USRP-users < > usrp-users@lists.ettus.com> wrote: > >>>>>> > >>>>>> On the E310 I'm seeing discrete jumps in the carrier. The carrier > will > >>>>>> intermittently jump around in steps of about 50Hz. Sometimes it will > >>>>>> jump by about 200Hz. I've attached a waterfall display, but I don't > >>>>>> know if attachments will make it through. > >>>>>> > >>>>>> My setup is: > >>>>>> E310 SG3 > >>>>>> UHD3.11 using the C-api > >>>>>> Timing Reference is "internal" > >>>>>> Center Frequency 1GHz > >>>>>> I/Q signal is a stream of 1,0... for a CW at the carrier > >>>>>> > >>>>>> I can see the same thing when I set the timesource to "gpsdo", but I > >>>>>> wouldn't expect it when I set it to "internal". My gut says that > this > >>>>>> is being caused by some timesource correction loop. If this is the > >>>>>> case is there a way to disable this? > >>>>>> > >>>>>> Thank you > >>>>>> <e310-lo-frequency-shifts2.png> > >>>>>> _______________________________________________ > >>>>>> 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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