This compact, lightweight power supply filter helps clean up dirty DC current that often causes lines in wireless video images. The filter is an LC type that uses large value inductor and capacitor components. .
The filter reduces DC-DC switcher supply ripple and helps clean noisy power from a shared battery. For example, if your robot or R/C model's 12V motor battery also powers the video camera and A/V transmitter, then this LC filter can help reduce the video "noise" that may appear when the motor is running.