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Will using the 5v external ?Amps supply the requirements for the shield?

Yes, all power from external 5v supplies necessary voltages for the mpcie card

How much current is @ 3v3 out pin ?

Not connected by observation , only in schematic.

Are all ground pins on the same thermal plane?


Hardware specification 1.4 for EC25 850ma for LTE, possibly 2A supply is adequate.