Editing NTSC (section)

=== OSKM (USSR-NTSC) ===
In January 1960, (7 years prior to adoption of the modified SECAM version) the experimental TV studio in Moscow started broadcasting using the OSKM system. OSKM was the version of NTSC adapted to European D/K 625/50 standard. The OSKM abbreviation means "Simultaneous system with quadrature modulation" (In Russian: Одновременная Система с Квадратурной Модуляцией). It used the color coding scheme that was later used in PAL (U and V instead of I and Q).

The color subcarrier frequency was 4.4296875&nbsp;MHz and the bandwidth of U and V signals was near 1.5&nbsp;MHz.<ref>{{cite book |last1=Sokolov |first1=Georgii |url=http://ca.cryptocom.ru/tmpfiles/mrb_0469.djvu |title=Amateur Colour TV Receiver TSVET-2 |last2=Sudravskii |first2=Dmitrii |year=1963 |access-date=September 5, 2022 |archive-url=https://web.archive.org/web/20220905221709/http://ca.cryptocom.ru/tmpfiles/mrb_0469.djvu |archive-date=September 5, 2022 |url-status=dead}}</ref> Only circa 4000 TV sets of 4 models (Raduga,<ref>{{cite web |date=September 6, 2022 |title=Raduga OSKM Color TV (1962) |url=http://rw6ase.narod.ru/00/twc/raduga_tw62.html |url-status=dead |archive-url=https://web.archive.org/web/20220906041751/http://rw6ase.narod.ru/00/twc/raduga_tw62.html |archive-date=September 6, 2022 |access-date=September 6, 2022}}</ref> Temp-22, Izumrud-201 and Izumrud-203<ref>{{cite web |date=September 6, 2022 |title=Izumrud-203 OSKM Color TV (1959) |url=http://rw6ase.narod.ru/00/twc/izumrud203.html |url-status=dead |archive-url=https://web.archive.org/web/20220116162957/http://rw6ase.narod.ru/00/twc/izumrud203.html |archive-date=January 16, 2022 |access-date=September 6, 2022}}</ref>) were produced for studying the real quality of TV reception. These TV's were not commercially available, despite being included in the goods catalog for trade network of the USSR.

The broadcasting with this system lasted about 3 years and was ceased well before SECAM transmissions started in the USSR. None of the current multi-standard TV receivers can support this TV system.