Line Subcarrier Subcarrier
Colour Country
Frequency Frequency Cycles
Approx Date
System Lines of Origin kHz
MHz per line
when tested
NTSC 405 UK
10125 2.6578125 262.5
1956-1965
NTSC 625 UK
15625 4.4296875 283.5
1964-1967
PAL 625 Europe
15625 4.43361875 283.7516
1967-present
SECAM 625 France
15625 4.40625 282
1967-present
& 4.25000 & 272
NTSC 525 USA
15750 3.583125 227.5
1953
NTSC 525 USA
15734.264 3.579545 227.5
1954-present
PAL 525 Brazil
15734.264 3.57561149 227.25 1976-present
PAL 625 Argentina 15625 3.58205625 229.2516 1976-present
History of Line Scanning
Standards for World TV Systems
Line Line
Country Frequency Frequency
Approx Date
Lines of Origin kHz Divider
when tested
243 UK
6075 3 x 3 x 3 x 3 x 3
1936
405 UK 10125
5 x 3 x 3 x 3 x 3 1936-1984
343 USA 10290
7 x 7 x 7
1936-1940's
441 Germany 11025
7 x 7 x 3 x 3
1940's
455 France 11375
13 x 7 x 5
1940's
819 France 20475
13 x 7 x 3 x 3
1950s-1980s
525 USA 15750
7 x 5 x 5 x 3
1940s-1953
525 USA 15734.264
7 x 5 x 5 x 3
1953-present
625 Europe 15625
5 x 5 x 5 x 5
1950s-present
1050
USA 31468.528 7 x 5 x 5
x 3 x 2 1990
1125
Japan 33750
5 x 5 x 5 x 3 x 3 1990
1250
Europe 31250 5 x
5 x 5 x 5 x 2 1990
CBS Field Sequential Colour TV System
Colour Colour
Line Field Frame Field
Frame
Colour Country
Frequency Rate Rate Rate Rate
Approx Date
System Lines of Origin kHz
Hz Hz Hz
Hz when tested
CBS 343 USA
20580 120 60
40 20 Early 1940s
CBS 405 USA
29160 144 72
48 24 1949-1952
The topmost table hopes to be a record
of every colour subcarrier frequency ever used ! However, information
about 819 line colour is missing, as I have never yet been able to find
any. I'm sure that France must have tested colour with 819 lines, probably
using SECAM, possibly NTSC, possibly both. If you have any information
about the history of experimental colour TV in France, with particular
reference to 819 line colour, or if you have any comments, suggestions
or corrections, please
mailto: stephen@sptv.demon.co.uk