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NRF52840 and RFX2411N

Fritz Kendeffy-Hermann

Hi,

we are testing nrf52840 together with rfx2411n amplifier to extend the range.

The problem is that we have same range and same RSI values when testing with bypass mode enabled or disabled. We only see a difference when testing in shutdown mode (no antenna is used in shutdown mode).

We are using SoftDevice S140 6.1.0.

SoftDevice PA/LNA Pins are configured correctly.

What could be the problem? How could we test, if SoftDevice is controlling the Pins correctly?

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  • +1

    Hi,

     

    How did you test this? Advertising, connection? Phone or DK in other end?

     

    One thing to keep in mind when using a front-end module is that it does not matter if you are able to transmit one signal far away if there is a weaker signal that needs to get back. If the sensitivity on the other end of the link is similar, the output power must be approximately the same, if not you need a corresponding shift in sensitivity as in output power to 

    The FEM LNA will also amplify noise and signal alike, and in addition generate its own noise. We've seen with a similar FEM, with slightly lower noise figure, that the sensitivity is effectively reduced only by a few dB. I still think you should see some range increase if the output power/sensitivty matches up as mentioned.

     

    Best regards,

    Andreas

Reply
  • +1

    Hi,

     

    How did you test this? Advertising, connection? Phone or DK in other end?

     

    One thing to keep in mind when using a front-end module is that it does not matter if you are able to transmit one signal far away if there is a weaker signal that needs to get back. If the sensitivity on the other end of the link is similar, the output power must be approximately the same, if not you need a corresponding shift in sensitivity as in output power to 

    The FEM LNA will also amplify noise and signal alike, and in addition generate its own noise. We've seen with a similar FEM, with slightly lower noise figure, that the sensitivity is effectively reduced only by a few dB. I still think you should see some range increase if the output power/sensitivty matches up as mentioned.

     

    Best regards,

    Andreas

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