How RSSI and SNR are being measured

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  • #31133
    bf
    Participant

    Hello,
    I have done some other experiments by adding a gradually increasing attenuation (from 50 dB to 125 dB) using an attenuator directly connected to an End-Node SMA port (the antenna is connected at the SMA port after the attenuator), but at the receiving side of the Multitech AP I was not able to see a significant degradation of the RSSI:
    -for 50 dB attenuation, the RSSI measured by the GW varies between -69 and -71
    -for 60 dB attenuation, the RSSI measured by the GW varies between -70 and -72
    -for 70 dB attenuation, the RSSI measured by the GW varies between -73 and -75
    -for 90 dB attenuation, the RSSI measured by the GW varies between -73 and -74
    Hence the RSSI does not seem to reflect the gradual decrease of the signal’s amplitude.
    Note that tests have been redone assuming a possible leakage RF signal from the board by wrapping the end-node in aluminum foil on a grounded metallic suface.
    -for 70 dB attenuation, the RSSI measured by the GW varies between -104 and -105.
    -for 90 dB attenuation, the RSSI measured by the GW varies between -104 and -107.
    -for 125 dB attenuation, the RSSI measured by the GW varies between -102 and -107.

    So I have several questions:
    1) Is the RSSI scaled between some extreme values (for example: below a signal level of X dBm, the RSSI will always be equal to a minmum value; and for a signal measured above Y dBm, the RSSI will be set to its maximum value) ?
    2) At what level is the RSSI being measured (Radio level or after some processing) ?
    3) At what level is the SNR being measured ?
    4) what is the sensitivity of the multitech AP ?

    Thanks a lot,
    Kind regards

    #32065

    Hello,

    I have exactly the same questions. Have you found some reasonable explanations ?

    Best regards,

    JB

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