I would like to know why does not it connect simplertk2B througt Xbee Sx Radio?, the led is turn off GPS > Xbee on a base ans Xbee > GPS on a rover.
I guess you are using an LR kit? Can you confirm?
If yes, at which step of the hookup guide did you get stuck? https://www.ardusimple.com/mr-lr-kit-hookup-guide/
Yes, I have an LR kit but I can’t connected, I think that I have disable the Xbee Radio because in the first moment the led was turned on.
If you changed the configuration it is normal that is doesn’t work. You can revert the board to its pre-configuration following the tutorial in this page: http://www.ardusimple.com/configuration-files