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difference between modules

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I have two modules (XB8-DMRS-002 rev G) on different PCB.
pic. 1 - https://ibb.co/HnwvS2F
pic. 2 - https://ibb.co/3CYGJkc

first, on (pic. 1) is working fine.
but one of them, on (pic. 2) did not work with default U. FL connector.
I understand my fault too late. so i used solder to set up my antenna at RF pad. And now it is working.
question is why first xbee (pic. 1) still working with U. FL connector?
asked Apr 19, 2019 in Interface/Development Boards by ananalog New to the Community (0 points)

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