Hi,

I have replaced my camera and since then, I get horizontal lines, only when motors are spinning, and I think, that they get even worse, when the quad is far away (300-400 mts), but I have tested it only twice in the air.

here are two videos and one side view of my quad.
video 1 : https://photos.app.goo.gl/afG7UPmkEGoZey8P9
video 2 : https://photos.app.goo.gl/tUjZno5pZCFXbTAb7
side view of quad : https://photos.app.goo.gl/tM1DfajZZvABEr9Y6 (the blue light is the VTX)

the original camera was FOXEER predator V2, It was second hand, and the lens was horribly scratched, so I decided to get a new in the box camera, and that one is a Caddx SDR2.
the 3 wires are connected as the original wires were connecte to the FC (SucceX-E F4 45A 2-6S Flight Stack (MPU6000))
the VTX is the same one (eachine TX526)

the VTX is located in the same place where it was located before, the power cables, the same, So, what could be the problem ? Or how should I solve it ? 

Thanks

Clear white lines are cause by noise from the ESC or/and the motors. Normally capacitor on the pigtail will remove most of it. To be honest, your video looks great. There just no way to get crystal clear video without any lines.

0. I do have a capacitor on the pigtail.

1. In the video that I took, it doesn't look like it looks while flying. while flying it is really much worse. it looks like standing waves, not exactly like white lines. but as I stil don't own DVR I can't record it and show.

2. with the other camera I did not have it at all, that is why I am surprised. and why I am sure that there is a solution.

3. could it be related to PAL/NTSC ? I did not change yet anything in the camera settings, It's actually my first new camera, and I have not yet used the joystick board to set anything, Is there anything that I should try change in the camera settings ?

Not a camera issue. It is a noise problem. If you already have a capacitor, then you might have to look into adding filtering.

https://oscarliang.com/connect-vtx-fpv-camera/