sending of spoofing FM signals to a RC car ?

Stop !

From the code you posted, you are not using the servo library, stop now before you damage something and read up on the servo library, then start using it.

The servo library generates the correct type of signal for you RC Equipment, its PWM but not the type of PWM you get from analogWrite, this should explain the type of signal that your RC Equipment expects and that the servo library generates -

Duane B