In standard television systems, color (chrominance) information is conveyed by a phase- and amplitude-modulated subcarrier. The NTSC (National Television Standards Committee) system used in the US and Japan employs a 3.58- (actually 3.579545-) MHz color subcarrier, while the United Kingdom's PAL system and France's SECAM system use a 4.40-MHz subcarrier. Read full article
Measuring Amplifier Differential Gain and Phase Accurately
Video system require 0.1% gain and 0.1° phase differences Valid measurements need proper instrumentaion and techniques
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