with horrible english(excuse me in advance) let me trry to explain what i know:
NTSC and PAL are color systems and not standards.
wrong informations came from guides and tutors from the whole world.
then, PAL is know as standard G and NTSC as standadrd M......wrong!
PAL is the color system in europe(not all countries) and NTSC the color system in USA (and other countries)
when the whole guides and tutors show that differences they forget to explain that the big difference is the standard G from europe and the standard M in USA.
for example:
in Brasil is PAL-M!
the difference from NTSC-M is only the color system but the standard M is equal (of course)
when you take one NTSC tv from USA to BRASIL, you see everything in BLACK & WHITE because the standard is the same M and verical frequence,horizontlal frequence, the tunner and size of his bands, frequences inside the IF channel and audio are equals...you only change to trancode the COLOR SYSTEM form NTSC to PAL to watch everything in color.
but if you take one tv PAL-G from europe to Brasil, you can't see anything because the color system PAL is the same but the standar G is completely different of the standard M and have a big difference between tvs PAL-G from tvs PAL-M.
you don't need to change the color system to use that europeans tvs in Brasil but the whole structure of the standards like (again), vertical frequence,horizontal frequence, the tunner and the sizes of his bands, frequences of the IF channel, audio channel frequences, the color(sub) frequences, etc.
then, better is forget to use that europeans tvs in Brasil.....the whole standard G give big troubles for that changes because they are really differents of standars M!
i wish that i could help you more in my explanations shgr (excuse my poor english again
)!
your doubts have more weight and deserve better explanations
...are more complex that is visible!