In 1321x-ICB Development Board reference desing, component: 2450BL15B200 is used as balun. I dont see the point why is this exactly the right component for this interfacing cos its impedance is 200 Ohms on balanced side.
Unbalanced is 50 Ohms, which seems right to the antenna, but I dont understand why does it suppose to be 200 Ohms at modem side. I would appreciate if anyone can clear things up for me on this.
Thanks,
Adam