during my first tests with the SX 868 DevKit (XK8X-DMS-0) i got -40dbm in the range test while both devices had only a distance of 5 cm. I would like to know, what i did wrong because this value is for my understand way to bad.
With the same setup i performed a test over 2.4km with an result of -82dbm. I don't believe that the ~13 km are possible with this and i my guess is, that the -40dbm in the close setup shows already the problem.
My Question is: Why do i have -40dbm in this small range and how can i reduce this? What do i need to change, to get the 13km to work?
Thanks for your help.
%% Current config
All default except: BR - 10kbps
And the changes were done according to page 24 of the guideline.