The tapes recorded by such systems as Type E (U-matic), Betamax, VHS, etc. all used heterodyned color-under. On playback, the heterodyning could, if desired, produce a higher-frequency signal. So, NTSC-4.43 was simply a means of watching tapes on multi-standard equipment.
NTSC tried to compete with SECAM for 625-line color, but it never got any countries.
Barbados, being 50 Hz and originally British, had 625-line TV, but, being in the western hemisphere, had to be System N, precluding a 4.43 MHz subcarrier. They could have gone to PAL-N, as Argentina did, but they were closer to the U.S. and found that, with a rigged sync generator, they could superimpose NTSC color on their 625-line pictures and get NTSC-M TVs to work (sort of work, anyway). To improve things, they switched to NTSC-M and added filtering to the power supplies of all TV sets that needed it to deal with the 50 Hz power.
TTFN, Mark flyback1 wrote:
There were and still may be many 'NTSC443' Umatic, VHS VCRs and monitors in use in Europe. I know Sony made them, Panasonic and others may have as well. Whether they also made NTSC443cameras is unknown to me.I don't believe there ever was an 'over the air broadcast standard' anywhere in the world based on this system, but it was used in corporate, industrial and medical video systems in the UK and probably other 50Hz countries.One piece I read stated the tapes these units played were actually recorded in NTSC358, but the decks included circuitry which converted the chroma up to 4.43 so multi-standard monitors could play them in color. The 4.43 conversion eliminated the need for a second [3.58] color decoder in the monitors.Googling 'NTSC443' results in over 1700 hits, one notably about designing a video to VGA convertor forthis standard.http://groups.google.com/group/sci.engr.television.advanced/browse_thread/thread/49d163c05e4f4181/0a8cc416ab538cbfDale Kelly wrote:Thanks Don,I've also tried to explain this to the group several times over the years.However, I also was not aware that there were 625/50 NTSC systems; whichwould occur if NTSC was adopted by a region with 50 Hz power line frequency.Would that be Japan?-----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Donald Mccroskey Sent: Sunday, December 17, 2006 11:27 PM To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: PALI wasn't arguing your point, but other postings on the topic were equating 625/50 systems with PAL, and vice-versa. Perhaps that is where my commentshould have appeared. Some world TV standards use a 525 line PAL color system, and others use a 625 line NTCS color system.---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways:- Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.
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