RSP1a time delay with WSJT digital software

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  • September 19, 2020 at 3:20 pm #1409
    swlingham
    Participant

      I’m receiving WSPR transmissions with a Raspberry Pi 4, GQRX, and WSJT software, with the RSP1a. After a few hours of continuous operation, I notice that WSJT is reporting about a 3 second offset in time. The Pi 4 is staying in sync with the network time, as expected. By unplugging the RSP1A from the Pi 4 for a few seconds, and plugging it back in, and restarting GQRX, the time offset on received transmissions drops to a more normal +- 1 second. Not sure if it is GQRX or the RSP1a. Need to test a bit more.
      3 seconds is not an issue w WSPR mode, but is for FT8, my next step, since in FT8 the time windows are only 15 sec each. I tried and could not receive FT8 signals with the 3-4 second offset.
      Has anyone else seen this phenomenon, and has anybody come up with a faster workaround than restarting the radio?
      Thanks so much for any comments!

      September 20, 2020 at 12:42 am #1410
      swlingham
      Participant

        After some additional testing, the delay is in the GQRX software. Simply stopping and restarting GQRX with the button in the upper left corner (starts/stops DSP processing per the software) fixes the large time offset and it falls to 0-1 sec, probably normal for a SDR receiver. Also results in nice decoding of FT8 signals. My next step is to try transmitting and receiving FT8 with the Raspberry Pi 4 and a QRP radio.
        73

        September 21, 2020 at 5:39 pm #1413
        Lee
        Participant

          it’s a shame our choices on linux are limited atm, its still alpha and unusable atm but one to keep an eye on is sdr++
          https://github.com/AlexandreRouma/SDRPlusPlus

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