I am currently using two inAir9 module to communicate between an Arduino Pro mini 3.3V and a Raspberry PI. The configurations of the transceiver (the Arduino) are : Spread factor = 12, output power = 14 dbm, channel = 10 for 868mHz and lora bandwith = 125kHz. At about 30 cm appart,I receive the messages with a low signal power (about -35 RSSI). I wonder if this reading is normal or if I should get a better signal power.
Thank for your assistance.