I have a tilt bicopter that has two servos, power schematics as the pic.
One Arduino Nano, an AMS1117 3.3v regulator, two servos provided with 5V by a mini 360 regulator
The Lora module runs on the 3.3V from Nano and AMS1117 3.3v regulator.
The 5V power line is unstable, causing the reading of the pot inside the servos unstable, ultimately causing servo jitter. The jitter happens at the exact timing when my flight controller receives and transmit packets. The jitter stops when I touch the end of the antenna or the 3-wire servo cable strip with metal or hand.
I've tried adding a capacitor to the power lines of the LoRa module and servos, it didn't work.
Coiling the servo cables to DIY EMI suppressing rings made of paper clips works, but I think there must be a better way. I'd like to know what else can I do.