https://devzone.nordicsemi.com/f/nordic-q-a/28753/how-to-set-nrf51822-sensitivityHi, We are using nRF51822 Gazell protocol. We found that when host dbm is getting down to -61 or -62 dbm, the communication will lost. We had set it to +4db and use 250kb datarate, use NRF_GZLL_DEVICE_CHANNEL_SELECTION_POLICY_USE_SUCCESSFUL &amp; 2700en-USTelligent Community 13Fri, 22 Dec 2017 09:49:19 GMThttps://devzone.nordicsemi.com/thread/113936?ContentTypeID=1Fri, 22 Dec 2017 09:49:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d3957c26-75a0-4cf5-b009-b5db1f5201b6ovrebekk<p>Hi</p> <p>I assume you are measuring this by reading the RSSI on the host side?</p> <p>The RSSI in the nRF51 device is not very accurate, and you could have an offset of up to +/- 6dBm.</p> <p>Also, if the signal drops out before you reach the sensitivity limit it could be caused by noise in the area (from WiFi, Bluetooth and similar).</p> <p>The RSSI in the nRF51822 should be valid down to about -80dBm, so below this you will not be able to measure the signal.</p> <p>Best regards<br /> Torbjørn</p><div style="clear:both;"></div>