Hi Michael - What version of UHD are you using? Can you provide the actual printout that happens with different GRC flowgraphs? It sounds like this is a bug, but if you're using older GR or UHD then it's a bug that might be fixed in a more recent version. - MLD
On Mon, May 3, 2021 at 5:48 AM Nieland, Michael <[email protected]> wrote: > Dear all, > > I am using two B210 USRP’s to generate and receive DQPSK Signals around > 1.53 GHz (two TX and two RX channels). The USRP’s use FW Version 8.0 and > FPGA Version 16.0 (Hardware Revision 4). I am having some trouble properly > changing the RX frequency at runtime using the message interface. When the > RX frequency is varied using a QT Gui Range slider I encounter no issues. > However, in my application I have to use the message interface. In general, > I assume that my pmt message structure must be correct, since it works fine > when the frequency is only changed by a few MHz. Also other commands (like > setting tx and rx gains) work as expected. If, however, the frequency is > requested to be set to let’s say 2 GHz from 1.53 GHz, an overflow is > indicated and the respective USRP Channel completely stops streaming (does > not restart). > > I tried using the “freq” command (both with indicating the channel and > without since it should not make a difference on the B210) and the > tune_request. I tried several different message structures but for some > reason it only works for the TX Usrp (When using the message port of the TX > Usrp to change frequency it is indicating some underflows right when the > frequency is changed and is then working fine without any underflows or > other issues). > > To eliminate the error I am right now testing in an isolated FG with only > a USRP source and a Message Edit Box (FG is attached) and the issue occurs > here as well. > > Any help would be appreciated and maybe someone was/is facing the same > issue? > > Best regards > > Michael > > > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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