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RX stopped working

NRF24L01+ paired to Arduino (2 units) Using Mirf sample code for server & client App worked initially but stopped after some tweaking of code. Uploaded original versions without successful RX of either module.

Q: Is it possible that close proximity of modules ~ 10mm caused saturation/blown RX circuit. If so what is closest "safe" distance of RF modules?

Note: On Arduino Uno board, both units' TX LEDs flash at about 1 Hz but RX never comes on.

Thanks in advance for replies.

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