• The 0 Ohm resistor is by default soldered on the red PCB antenna contact points. 

  • To use Wired Antenna or U.Fl Connector it is necessary to place it in front of their contact points (marked with the green rectangle).

  • > Unsolder 0 Ohm resistor from red marked position and solder it on the green marked position.

    Wire lenght for 868 MHz:

    λ =34,54 cm
    λ/2 = 17,27 cm
    λ/4 = 8,63 cm

    (length shouldn’t incluence the transmission quality, but it’s worth to test which length will give the best solution – start with the longest and reduce the length step by step until you are satisfied with the solution)