Set TX power on an NRF52833

[SET]

Hi,

I try to set the TX power of the NRF52833 to the maximum possible power level, but somehow nothing seems to affect it.

I first tried to change it in the sdk_config.h from 0dBm to +4dBm, but it seems not to affect it. Then I discovered, that the default

signal strength from radio_config.h is RADIO_POWER_NRF_0DBM, so I replaced it everywhere with RADIO_POWER_NRF_POS8DBM,

but also this did not affect the power level when measured with a mobile phone. 

I have two questions now:

• How can I properly adjust the power level to constant maximum power?
• How it comes the NRF52833 has +8dBm, but this seems not adjustable from the sdk_config.h?

Kind Regards,

Sebastian

[Simonr]

Hi Sebastian

To set the TX power level, you have to call the function "sd_ble_gap_tx_power_set(), which is defined in ble_gap.h. If you're using SoftDevice S140, there should not be any issues setting the TX power to 8dBm here. You can check out the ble_app_proximity example to see how it is used in a main.c file.

Best regards,

Simon

[SET]

Hi Simon,

Thank you for your response. Im using S113, which is used for the example for the nRF52833. How can I switch the examples to the S140? Just replace the core files?

Further, sd_ble_gap_tx_power_set() has a handle for Advertising and Connection. For Advertising I could achieve the tx power level switch, but I don't see where I should adjust the connection, since I dont have a connection handle except in mesh_gatt.c, but this handle comes only from an event.

[SET]

Am I right with the assumption, that when I set the advertiser TX power level "sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV, m_adv_handle, power_level)", it will automatically set the power level also for connection, since in ble_gap.h is a note: @note When a connection is created it will inherit the transmit power from the initiator or advertiser leading to the connection.