RE: Setting Tx Output Power with Zephyr/NCS SDK

Ramakrishnan — Mon, 01 Dec 2025 12:45:25 GMT

Thank you Swathy. I missed noting the difference in max output power between QFN and CSP package types. We are using QFN and the below two config gets it to power up with 7 dBm. The same debug print outputs 0x39 corresponding to 7 dBm !

CONFIG_BT_CTLR_TX_PWR_PLUS_7=y

CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

RE: Setting Tx Output Power with Zephyr/NCS SDK

SwRa — Mon, 01 Dec 2025 12:12:53 GMT

Hi Ramakrishnan,

Sorry for the delay. To set the Tx power to +8dBm, using the method you described is the right approach:

CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

Could you confirm that you are using the CSP variant of the nRF54L15 SoC.? For nRF54L Series SoCs, the maximum TX power depends on the package variant. CSP package variants have a maximum TX power of 8 dBm, while for the QFN package variants it is 7 dBm.

[quote user=""]. But based on what I read , it happens after a connection is done, but I need this power change for advertisement as well and across any connection/disconnection events[/quote]

The set_tx_power function can be called for both advertising and connection handles. See: nRF54L15 change tx power

Best Regards,

Swathy