Hat tip to @mathew - I just learned that France had a graeter than 720i broadcast standard in the 1940s!
I gotta find some old french gear, I guess.
HD broadcasting in 1948!
The sets were 4:3 of course, but basically they were 4:3 720i black and white.
(in practice it was actually more like 816×736 px vs 720's 960×720, but also it was analog so the minor differences were probably lost anyway.)
The standard was used in to the 80s, but I'm having a really hard time finding any information about it.
If you're french, and you know what this was called in france, please let me know!
Here's a thread where some folks are driving 819 line sets from a VGA cable: https://www.vintage-radio.net/forum/showthread.php?t=167674
and from a converter box that doesn't appear to be sold anymore.
I wrote a blog post summarizing the things I learned about HD broadcasting in the 40s:
@ajroach42 $10k non-functioning in North Hollywood CA lol
@ajroach42 if this one https://newatlas.com/teleavia-type-p111-high-definition-tv-1958/13026/ went for 2400 pounds in 2009 (in better condition arguably) I'd say they're lucky to get US$3,000 for theirs imo but ymmv yolo etc
@djsundog That was my thought exactly.
Figured maybe 2500 (on the assumption I can fix it and generate signals for it.)
A social network for the 19A0s.