Its natural waveform is a negative pulse of 300mv also known as the front porch followed by 10 cycles of the colour sub carrier of PAL video, the frequency of the sub carrier is 4.43361875 MHZ.
Its natural waveform is a negative pulse of 300mv, the frequency of the sub carrier is 4.43361875 MHZ. These 300mv are also known as the front porch. This front porch is followed by 10 cycles of the colour sub carrier of PAL video.