First of all, Thank you for your comment.The B-L072Z-LRWAN1 work with SF above 6 (according to the example code), i'm using the 868Mhz module and i need bi-directional communication.I don't understand why it will work good for a beacon and give poor ...

can you give the code for 1KM? i tried the ping-pong with less data, SF=12, BW=125K and not get more then 50-70 meters.