When I first started using UHD 4.0 with the N310 (this past summer), I noticed what I thought was a degradation in the device's ability to lock. I was comparing one N310 running UHD 3.15 to another running UHD 4.0. Both systems were located a few feet apart from each other with the same model antenna so they should have produced similar results, but it seemed that the 3.15 system achieved lock more easily. In any case, I never spent the time to "prove the case" and then got distracted on another issue and never returned to it. Not sure if this is relevant in this discussion, but I thought I would mention it. Rob
On Fri, Feb 19, 2021 at 9:12 AM Marcus D Leech via USRP-users <usrp-users@lists.ettus.com> wrote: > > Are the antennae situated outdoors? > > It can take almost an hour to achieve lock from a cold start. > > Sent from my iPhone > > > On Feb 19, 2021, at 4:14 AM, Johannes Demel <de...@ant.uni-bremen.de> wrote: > > > > Each USRP has its own GPS antenna. One of those you buy at ettus.com as a > > recommended accessory. > > > >> On 18.02.21 15:05, Marcus D Leech wrote: > >> How are you delivering the GPS antenna signal to the USRPs? Via a > >> splitter? Does that splitter provide DC pass-through? > >> Sent from my iPhone > >>>> On Feb 18, 2021, at 7:07 AM, Johannes Demel via USRP-users > >>>> <usrp-users@lists.ettus.com> wrote: > >>> > >>> Just a quick follow-up. The B210 finally got a GPS lock. (I had to wait > >>> for ~2h). Though, all N310s still don't. > >>> > >>>> On 18.02.21 10:12, Johannes Demel via USRP-users wrote: > >>>> Hi all, > >>>> I have some N310s and a B210 that I try to sync with a GPSDO. All of > >>>> them recognize their GPSDOs but fail to lock. > >>>> My phone can see ~7 Satellites. We have a RPi with a GPS module that > >>>> locks to GPS in the same hall. We switched antennas but still, we can't > >>>> sync any of the USRPs to GPS. > >>>> I tried: > >>>> ``` > >>>> lib/uhd/utils/query_gpsdo_sensors > >>>> ``` > >>>> and > >>>> ``` > >>>> lib/uhd/examples/sync_to_gps > >>>> ``` > >>>> but even after a day, they always return "GPS does not have lock" and > >>>> "WARNING: GPS not locked - time will not be accurate until locked". > >>>> `gpsmon` on the N310s reports 0 Satellites. But it has a list of > >>>> satellites. > >>>> Since we have several devices in that room that are able to acquire a > >>>> lock but none of our USRPs with their GPSDOs, I wonder what is going on. > >>>> Do they need a very strong signal? > >>>> Cheers > >>>> Johannes > >>> > >>> _______________________________________________ > >>> 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
