Sipy deepsleep shield and sigfox transmission

  • Hi,

    I am trying to send a sigfox message using the sipy 1.0 deepsleep shield and a lipo battery. When connected to USB everything is working fine. But when using the lipo everything from the python side looks fine but I cannot get a message out to the sigfox backend.

    I looked a bit deeper at the issue and it seems that below around 4,6V no messages are going out from the sipy.

    This is how the messages look on a spectrum analyser. The messages below 4,6V seem to be garbled.

    Can anyone confirm this. This would mean that the sipy is pretty much useless with a lipo battery ;-(. I just tried one module maybe I need to try another one.

    Firmware version:
    Pycom MicroPython 1.18.1.r1 [v1.8.6-849-b0520f1] on 2018-08-29; SiPy with ESP32



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