ratledge wrote: ↑Sun Dec 13, 2020 7:10 amThere is one more possibility: do you have a good power supply?
If you are using the OEM 2amp one, then you need to upgrade to 2.5amp (12v = 30 watt) instead, because that specific modem sucks up a lot of power. Those EM20-G modems are all Engineering Samples, they never went to full production and Quectel moved to the EM160R-GL for CAT16 and EM120R-GL for CAT12, although the EM12-G is still available.
I upgraded my power supply to a high quality full 3Amp one.
And once again, I can't stress enough the importance of choosing the right modem for your particular network.
The most popular modems in the US are the Quectel EM12-G (4G), EM16-G (EM160R 4G), RM500Q-AE (5G) and the Simcom SIM7912G-M2 (4G), SIM7920G-M2 (4G), SIM8200EA-M2 (5G).
Note that the Quectel RM500Q-"AE" must be version "AE", and Simcom SIM8200"EA"-M2 must be version "EA", only those versions will work properly on all US 5G bands. For example the RM500Q-"GL" and the SIM8200"G"-M2 are the global versions with SA (Stand-Alone) bands only, and are missing essential NSA (Non-Stand-Alone) bands. This is very important when ordering modems, otherwise they are useless on US 5G bands or very limited, and will only work in 4G-LTE mode. In the US we use NSA modems since we don't have a fully SA network yet, so make sure to get the right modem which covers most of your carrier's bands and modes.
Here's a good explanation about the difference between SA and NSA bands/modes:
https://www.ericsson.com/en/blog/2019/7 ... -5g-tracks