Update README.md

README.md

@@ -21,6 +21,7 @@ Can be used in two modes:
   - lora module CfgPinRst, pin 26
   - lora module CfgPinDio0, pin 14
   - lora bandwidth CfgBw, 20 kHz (to fit into standard 25 kHz channel)
-  - lora spread factor CfgSpread, 9 (seems to be optimal between signal level and transmit time)
+  - lora spread factor CfgSpread, 11 (down to -17.5dB)
+  - lora coding rate CfgCodingRate, 7
   - lora output power CfgPower, 20 (set to maximum 20 dBm ~ 100mW, change to lower value if needed)
 - use 80 MHz ESP32 frequency in Arduino, it will prolong battery life when operating portable, higher speed is not needed