RSSI

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    Hello,

    I’m using a MTCAP-868-041A base station with 5.3.3 firmware to test a LoRaWAN radio subcircuit I have designed.

    My device emits 14dBm (SF8BW125). I have tried different antennas (PCB, chips, wire…) with the same results. Distance between base station and device is about 1m. Propagation loss @868MHz are 31 dB (for 1m).

    Received packet (for example):
    00-04-a3-0b-00-13-ef-57 868.300 SF8BW125 9 -66
    RSSI = -66
    SNR = 9

    If I install my device in another room (about 10m):
    00-04-a3-0b-00-13-ef-57 867.100 SF8BW125 6 -107
    RSSI = -107
    SNR = 6

    My device returns a SNR greater than 15 dB.

    Free space losses : 51 dB. If I add 20 dB for all other losses, I should receive 14 – 71 = -57 dBm.

    Of course, I have verified that in both case, transmitted power was 14 dBm.

    What is the unit of RSSI ? dBm ? And if this value is given in dBm, why is there a difference (50 dB !) between expected value and RSSI returned by my base station ?

    Regards,

    JB

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