How can i increase the distance for two LoRa devices

Check the use environment

First , User should notice: Radio link quality and performances are highly dependent of environment.
Better performances can be reached with:

• Outdoor environment.
• No obstacles.
• No high level radio interfere in the ISM band you use.
• At least 1 meter above the ground.

Radio performances are degraded with:

• Obstacles: buildings, trees...
• Inner buildings environments.
• High ISM band usage by other technologies.
• Radio communication are usually killed with bad topographic conditions. It is usually not possible to communicate through a hill, even very small.

Check the Antenna

• Check if the Antenna has a good connection to the Antenna connector
• Check if the Antenna has the good performance in the require frequency. (need special device, so may not possible to check in most case.)

Check the Frequency Setting in Software

• Check if in the software, the correct frequency is set.

Check the Modem Setting in Software

Check if the modem is set to the correct modulation, Different modem setting will affect heavily in the distance and datarate. User can refer this document to see how it works.

To configure modem setting in RadioHead Library, use can consult below place in the software:

• RH_RF95::ModemConfig in RH_RF95.CPP
• setModemConfig in RH_RF95.CPP