[Penthode]

I am sorry that this has become a contentious issue. The point of my post was that the final NTSC signal configuration standardizing the color subcarrier frequency and asymmetrical chrominance wideband (I and Q) which was to later be standardized and decodable by the CT100 and later NTSC color tv sets, made its public over-the-air debut on 27 January 1953. The earlier configurations involving the original dot sequential, mixed highs, constant luminance, CPA etc. would not be decodable on a CT100 or later NTSC standard color television without modification.

27 January 1953 was the first "official" broadcast. The petition describes the work RCA engineers did to the very first live test color studio in the world, Studio 3H equipment to facilitate the broadcast delivery the live scheduled programming via the final standard through early January and that the NTSC voted to adopt the standard on February 2, 1953.

Read the 700 page petition. It is all documented there.

The final NTSC color signal was not fully formed in 1951 nor did it take until 1956.