English NTSC TV's.

[NewVista]

If PAL-Delay were working with progressive scan then V chroma res would be halved, but with interlace it becomes way more disastrous: The summed interlace pairs have double the separation. This, and its diminished "Kell factor" would take V chroma res down to <80 'lines'. Same for H chroma res with motion - maybe down to ~50 lines.

NTSC-M could achieve ~ 100 x 350 'lines' chroma

[ppppenguin]

Since chroma bandwidth is much lower than luma the reduction in vertical resolution doesn't matter. PAL decoding just about equalises the H and V chroma resolutions.

PAL decoding also moves the chroma down by half a line wrt luma. Again this doesn't matter unless you cascade codecs. More modern comb filter decoders can keep the Y and C in vertical alignment.

[NewVista]

"..moves the chroma down by half a line wrt luma."

The way I see it, it would be two lines displacement (line 1 to 3, line 2 to 4...)?
This would be another PAL-D chroma artifact - creating headaches for designers of decoders for standards converters..
The H res one being worse than progressive scan conversion sans motion compensation which blurs so badly
designers would rather just double fields (in early days) kind of like THAT notorious Sony "PAL" TV did).

Only the Germans could come up with such a Heath Robinson solution to Hanover Bars.

[Penthode]

PAL and SECAM were variations on a theme developed by NTSC. The acronyms I have heard for each are interesting and define well the politics between the variations:

NTSC - Never Twice the Same Colour (as explained earlier in this threa)

PAL - Problems Are Lurking - This name probably arose from the editing of PAL. It was painful because of the 8 field colour sequence rather than the four NTSC offered.

SECAM - System Essentially Contrary to the American Method - With France and it possessions and the Soviet Bloc adoption, the name says it all.