Fs-ia6b no ppm signal

Hello all,
I have a problem on Mission Planner, I have connected my drone and radio system correctly and I am trying to do radio calibration but there is no signal on mission planner and I stuck at this point. Any help will appreciate thanks.
i have a rasp pi 2, navio2 flyskyi6 and fs-ia6b but i cant see radio signal
https://www.dronmarket.com/flysky-fs-i6-uzaktan-kumanda/ FLYSKY İ6 LİNK PLEASE HELP ME