hi,
On 2/12/20 8:15 PM, Tomcsányi, Domonkos wrote: [...]
I assume with other radio hardware (e.g. umTRX) there are no issues with Exynos devices, so it is most probably the USRP not being good enough I think.
i regulary use a b200/b210 series for tests, so i am quite sure it works when using a known good clock.
try sending a external clock to the device, for example a 10MHz gpsdo or another source which you can trust. sometimes even old lab equipment can be used as a source when it has a reference clock output (typically bnc).
enable using it by adding to your osmo-trx.cfg:
trx clock-ref external
the internal clock generation on generic sdr boards (which are not targeted at gsm/tdma systems) are often not precise enough. this is true for the basic usrp series as well as simple boards like the limesdr mini or usb(which you also can feed a clock).
in contrast: the limenet micro has a gpsdo on board for exactly this reason. the same is true for boards like the UmTRX, or when you add an precision source to a usrp. i think there is a module to add gps for the usrp.
However if anybody has any other ideas I’d still be happy to get any feedback and try things out :).
Cheers,
Domi
i hope this gets it working for you.
kind regards.