Technical instruction to solder external antenna

Modified on Tue, 1 Mar, 2022 at 7:22 AM

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)