Nano CH340G + SIM7600E-H: LTE insufficient signal despite strong network availability

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  1. I double checked the power supply unit and actually the gauge has the wrong unit (mA x 100 instead of mA x 10). Remembered, that when I built it we did not have the correct gauge and used this one instead...) Could not believe the 15 A and the real value is 1,5 A. Just to be sure I tried with 5 A (which is max), but the result was the same.
    In Addition I used the setup with the BatteryShield and 2 x 3200 mA batteries also with the same result. So I guess the final conclusion here is, that the power supply is sufficient.

  2. Nano A2 goes to SIM7600E K-PWRKEY
    image
    In between are a couple of resistors, a diode and a bipolar transistor.
    If the routing is relevant I can describe it to you, but generally the system is proven and has been built many times, so I do not think, that the general power supply concept is faulty.

  3. Not sure why, but now I got the extended debugging in the serial monitor.
    It is included in the attached pdf-document. Is there a way to provide this serial monitor outputs in a better way here directly?
    LTE SSL Mode Test 04_Serial Monitor Output.pdf (55,2 KB)
    On the first signal strength feedback the monitor now delivers -72 dB. Anyway, later it still returns a Connect Error and if I look at the Webserver, where the test data should be displayed, nothing has been received there. Does the new output give you additional hints, what the problem might be? Could it possibly be as simple as an insufficiently strong LTE antenna?

  4. Still working on that. In the new monitor output there is a line quite at the beginning stating "SMS done" - could this already be a successful SMS-test?