RFM69_RFM95_ATC_SignalReport



  • Hi there,
    I'm trying to get a feeling (distance/quality/speed/range/usability) for RFM95 (868Mhz) modules and so I started with an ESP8266 as RFM95 MQTT gateway and a Pro Mini with RFM95 and RFM69_RFM95_ATC_SignalReport.ino Sketch I found in examples with

    #define MY_RFM95_ATC_TARGET_RSSI_DBM (-70)  // target RSSI -70dBm
    #define MY_RFM95_MAX_POWER_LEVEL_DBM (10)   // max. TX power 10dBm = 10mW
    

    Following values are reported back to my gateway. I'd really appreciate a short explanation, what to "expect" from these values (similar to "values from 0 to 10, 10 best"):

    SR_UPLINK_QUALITY
    SR_TX_POWER_LEVEL
    SR_TX_POWER_PERCENT
    SR_TX_RSSI
    SR_RX_RSSI
    SR_TX_SNR
    SR_RX_SNR
    

    Following values for 1m distance between gateway and sender and I have honestly no idea what those values are telling me:

    SR_UPLINK_QUALITY 0 
    SR_TX_POWER_LEVEL 5
    SR_TX_POWER_PERCENT 0 
    SR_TX_RSSI -34 
    SR_RX_RSSI -27 
    SR_TX_SNR 9 
    SR_RX_SNR 9
    

    What is uplink quality telling me and why it's 0, why is TX power percent 0 and power level 5? Looking forward to hear from you.

    Cheers,
    Thomas


  • Mod

    Atc will try to keep TX rssi above - 70db by adjusting the TX power. If you move the node away from gateway you should see TX rssi decrease until - 70 then the power should start rising as you get farther away


 

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