I recently carried out a range measurement with two Dragino LoRa shields with rfm95 modules (or rather PCBs derived from them with the same circuit). Already at 500m and direct line of sight the reception at SF11 and 64kHz was about -140dB (calculated by SNR and RSSI as stated in the datasheet) and hardly any more packets got through. i used 14db tx power at PA_BOOST and LnaBoost at the receiver. The maximum range should be significantly higher with these settings, does anyone have any ideas what the problem could be?
I will be happy to provide more information about hardware and software if necessary.
thanks in advance,