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OpenThread nRF52840 radio TX power output

Roger

Hi All,

I would like to know what the default value is for the radio TX power for the nRF5240. According to Nordic's specification, the output power is programmable from +8 dBm to -20 dBm. I see there is a CLI command added txpowermax in the OpenThread stack repository, but I believe the latest version is not yet updated on the SDK for Thread.

I also checked the diag power command and see the TX power is given a default value of 0 dBm. Is this just the radio TX power for diagnostics purposes?

Best regards,

Roger

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  • 0

    Hi Roger

    The default output power is 0dBm (1mW).

    You can change the output power by using the otLinkSetMaxTransmitPower(..) function in the openthread libraries.

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Hi Roger

    That depends on your use case. The drawback of increasing the output power is that the average current consumption increases, so if battery life is very important you might want to take that into account. I would suggest you do some testing at 0dBm and see if you get the range you need, and if you feel it is not sufficient then you can increase it to +4 or +8 dBm. For reference each 6dB increase of the output power should double the range.

    Best regards

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  • 0 in reply to ovrebekk

    Hi Roger

    That depends on your use case. The drawback of increasing the output power is that the average current consumption increases, so if battery life is very important you might want to take that into account. I would suggest you do some testing at 0dBm and see if you get the range you need, and if you feel it is not sufficient then you can increase it to +4 or +8 dBm. For reference each 6dB increase of the output power should double the range.

    Best regards

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