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NFC reader detection field?

Hello:

I've got a application where I want to detect if the NRF52 is near a NFC reader. I don't need two way communications, but it would be good if the reader could modulate the 13.56 mhz signal (and I can do this custom in hardware if need be).  Using just a oscilloscope and a raw NFC 13.56mhz antenna I can detect energy out to about 10 inches with just a stock reader or Android phone. 

Can the NFC hardware/software be set to detect a NFC field? 

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