PX4 is generating wrong PWM signal for the ESCs

[Abdelrahman_Hassan]

I recently bought Pixhawk 2.4.8 and tried to use it with the ESCs attached in the image below:

However, after booting up, the ESCs are making some strange noises indicating there is some error.

I tried to debug the PWM signal coming out of Pixhawk, only to discover that the signal frequency is around 396hz not 50hz as in the attached image.

is it a normal behavior for Pixhawk to output a 400hz signal for ESC? and if not, what could be the problem knowing that ESCs are calibrated?

[pacak]

Usually AUX port has 50Hz output frequency for the servos, while the MAIN port is 400Hz by default.
You can lower it with setting PWM_MAIN_RATE probably.