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nrF5340DK Bluetooth PCB Antenna Gain & Transmit Power

zeuhor

I didn't find any information about the Gain of the Onboard PCB Antenna of the Developement Kit, nor the effective Transmit power that is available. Where can I find it, and how can I set the desired Transmit Power?

Thanks in Advance

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  • +1

    Hello,

    You can change the TX power setting used by the BT controller on the netcore by changing the default CONFIG_BT_CTLR_TX_PWR_0 symbol to one of the other CONFIG_BT_CTRL_PWR_* symbols for your HCI_IPC build. For example, CONFIG_BT_CTLR_TX_PWR_PLUS_3=y if you want to set the RADIO output power to +3dBm. Supported power levels can be found from the TXPOWER register definition.

    Instructions on how you can apply configuration changes to child images such as Bluetooth: HCI IPC are given here: Permanent configuration changes to child images.

    E.g.,

    ├── child_image
    │   └── hci_ipc.conf

    where hci_ipc.conf contains this line: CONFIG_BT_CTLR_TX_PWR_PLUS_3=y if you want to set the RADIO output power to +3dBm.

    If you want to verify after building sample that your configuration was applied, you can check the generated .config file in build/hci_ipc/zephyr.

    The PCB antenna is supposed to be omnidirectonal so I assume its gain is close to 1, but I don't have a measured value for it. 

    Best regards,

    Vidar

    Edit: antenna gain should be around 0 dBi according to this post:  Rated output and pcb antenna gain of nRF52-DK  and this one: RE: Gain of the PCB antenna of the nRF5340-DK  

  • 0 in reply to Vidar Berg

    Thank you very much! After Editing, I found it in the hci_ipc.conf set to the value 3dbm. However, I didn't really notice any difference between the different settings of power, no matter what I set it is around the same value if I look at the nrF connect app from my smartphone. I wonder is it because CONFIG_BT_CTLR_TX_PWR_ANTENNA is set to 0 in my final build? You can see a screenshot of the .config after build:

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  • 0 in reply to Vidar Berg

    Thank you very much! After Editing, I found it in the hci_ipc.conf set to the value 3dbm. However, I didn't really notice any difference between the different settings of power, no matter what I set it is around the same value if I look at the nrF connect app from my smartphone. I wonder is it because CONFIG_BT_CTLR_TX_PWR_ANTENNA is set to 0 in my final build? You can see a screenshot of the .config after build:

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