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In page NTSC:
"NTSC 4.43 is a pseudo-system that transmits a NTSC color subcarrier of 4.43 MHz instead of 3.58 MHz[1] The resulting output is only viewable by TVs that support the resulting pseudo-system (such as most PAL TVs).[2] Using a native NTSC TV to decode the signal yields no color, while using an incompatible PAL TV to decode the system yields erratic colors (observed to be lacking red and flickering randomly). The format was used by the USAF TV based in Germany during the Cold War and Hong Kong Cable Television.[citation needed] It was also found as an optional output on some LaserDisc players sold in markets where the PAL system is used.
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