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how to set nRF51822 sensitivity?

Hi,

We are using nRF51822 Gazell protocol. We found that when host dbm is getting down to -61 or -62 dbm, the communication will lost. We had set it to +4db and use 250kb datarate, use NRF_GZLL_DEVICE_CHANNEL_SELECTION_POLICY_USE_SUCCESSFUL & 2700 time slot Accordance to nRF51822 specification, it should able to handle down to -90dbm.

So question is how to set the sensitivity?

Thanks so much!

  • Hi

    I assume you are measuring this by reading the RSSI on the host side?

    The RSSI in the nRF51 device is not very accurate, and you could have an offset of up to +/- 6dBm.

    Also, if the signal drops out before you reach the sensitivity limit it could be caused by noise in the area (from WiFi, Bluetooth and similar).

    The RSSI in the nRF51822 should be valid down to about -80dBm, so below this you will not be able to measure the signal.

    Best regards
    Torbjørn

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