https://devzone.nordicsemi.com/f/nordic-q-a/118724/tx-settings---nrf21540-nrf52840Hi, I&#39;m using NRF21540-DK board to test hci_pwr_ctrl example. My FEM module can boost upto +21 dBm. How to correlate the tx power of radio peripheral(NRF52) and fem module(NRF21540). The output logs are given below. And also CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROLen-USTelligent Community 13Tue, 11 Feb 2025 08:17:35 GMThttps://devzone.nordicsemi.com/thread/522354?ContentTypeID=1Tue, 11 Feb 2025 08:17:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:90c30c86-ad76-4d2d-b8ad-123481975e8bChandu@1996<p>Thanks for the input. I was able to see the power range from 21 dbm gradually getting dropped to -30 dbm for every 5 seconds.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/522224?ContentTypeID=1Mon, 10 Feb 2025 14:09:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:46f0747c-7f66-47ca-9367-5ee488b300a7Bendik Heiskel<p>Hi,</p> <p>The MPSL FEM driver will automatically calculate the output power of the SoC and the FEM gain to get the desired output power.</p> <p>The reason you are not seeing higher output power is because the sample by default is configured to only have a maximum of 4dBm output power.</p> <p>If you modify the <a href="https://github.com/nrfconnect/sdk-zephyr/blob/d0bef36f9bda4c30f58382d57413f01d8d55ba2f/samples/bluetooth/hci_pwr_ctrl/src/main.c#L43C1-L44C30">txpower array</a> to use higher output powers you will get more than 4dBm.</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Bendik</p><div style="clear:both;"></div>