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AS stated above, the RCA CTC-121 was the only consumer set that revived IQ demodulation. DVD players, DTV converters, etc, all use equiband modulation, but it may be wider band than the standard Q channel. If you input this to your TV as baseband composite, or especially S-video, you may get some chroma bandwidth improvement. However, the best chroma bandwidth by far comes from using the component Y Pr Pb output of such devices if they have them, and skip the chroma mod/demod process altogether.
No idea if your 1988 13in Sony RVM 1344 Pro Monitor used IQ demods. Tektronix monitors did not. In fact, the smaller screen Tek monitors had a strictly limited luma bandwidth also to prevent moire patterns due to chroma dots beating with the relatively coarse screen stripes. TV station engineers loved them - the pictures looked CLEAN because they also hid any garbage in the upper end of the luma signal.
By the way, I know someone who worked on a super high-res sharp focus NTSC monitor for Tek. The project was dropped when they saw that it made NTSC pictures look awful when you had full-contrast resolution of all the luma artifacts and the scanning lines with black spaces in between.
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