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nrf52840 power optimization

Hey guys I am using nrf52840 dongle for scanning ble beacons. I want my dongle to be power optimized in a way that it starts scanning for 10 sec and then go to sleep for one minute and then resume scanning. When I measure my dongle to with continuous scanning, it uses 17mA, and then goes to 5mA and 0mA for 1 sec maybe changing channels then goes back to 17mA, I want to start and stop scan as desired. Also if we change the transmit power, can we minimize power.

Kindly give suggestions how to achieve this. 

Regards,

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