The control channel can be any proportional channel or 3-position switcher channel. (2-position switcher channel can only switcher within two video input signals This module can connection 3 video sources and you can switcher between different video sources with a 3 position switcher to your ground station. If you have multiple cameras on your plane, this is what you need Adopts high speeds video switcher chip, effectively reduce the vibrations of the Video Images 3Channel Switchover module,adopts high speeds video switcher chip,effectively reduce the vibrations of the Video Images Supports 5-12V power supply, and the control signals use signals for stable performances