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Pixhawk 2.4.8 and fs tx

Hi, i have a pixhawk 2.4.8 and i’m setting it to work with ardurover 4.0.
I have the problem that my pixhawk don’t receive signals from radio though i have set it ppm mode on ch1. I done this test too : and radio in ppm and pwm/ppm encoder to pixhawk.
Before to say it is broken i would like to know if it has an other setting to able the ppm input. Can you help me? Thank you very much.

Servers by jDrones