I did some snooping about and found some information that references Camarena broadcast in August 31, 1946:
http://www.blinkbits.com/blinks/televisions
In Mexico, Guillermo González Camarena (1917–1965), invented the early color television transmission system. He received patents for color television systems in 1940 (U.S. Patent 1942 (2296019), 1960 and 1962. The 1942 patent was for a mechanically scanned color filter adapter for an existing monochrome electronic transmission system.
In August 31, 1946 he sent his first color transmission from his lab in the offices of The Mexican League of Radio Experiments in Lucerna St. #1, in Mexico_City^. The video signal was transmitted at a frequency of 115 MHz. and the audio in the 40 metre band.
I decided to also look up the patent info. Checking with the US Patent Office for the mexican inventor named: Guillermo Camarena I was only able to find a single US patent fro this inventor. Copy the entire link into your web browser to view (you need a TIFF browser plug-in to view it)
http://patft.uspto.gov/netacgi/nph-P...o+AND+Camarena)
I couldn't find any patents for 1960 and 1962. If anyone's interested in actually reading the original 1942 patent, I've attached it as a Microsoft DOC file and then zipped it to save on cyber bandwidth.
Tom