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nRF52840 - BLE strength/Range weak

Hi Nordic team, 

We have just received our PCB prototypes with nRF52840 chip. While testing BLE functionality we found that the BLE is very weak. The connection is lost within 4/5 meters. We used to use nRF52833 and the range was a lot bigger. I set the TX power to +8 and this improved the range a bit but not as we need for our application. 

Is there any suggestion you can help us with to try in the software to improve the connectivity?

Mnay thanks

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