http://forum.arduino.cc/index.php?topic=171404.0
http://forum.arduino.cc/index.php?topic=171746.0
- Every 6 dBm receiver sensitivity gain will be double the distance.
- Every 6 dBi antenna gain will be double the distance
- Every 6 dBm Transmitter power gain will be double the distance.
- Base on Friis Transmission Equation, for sub Ghz chipset, if we select 300 Mhz v.s 900 Mhz band, the distance will be 3 times more. same thing if we select 300 Mhz v.s. 2400 Mhz, the distance will be 8 times more.