You probably have the info on earlytelevision.org, but here it is anyway:
https://www.earlytelevision.org/peter_yanczer.html
The narrow band television association in England:
http://www.nbtv.wyenet.co.uk/
sells a CD with both 32 and 30 line images
http://www.nbtv.wyenet.co.uk/cd2.htm
Using this would be a good way to separate camera and receiver problems.
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I built a receiver using one of Peter's laser-machined disks (I think 32 lines).
http://www.bretl.com/mechtvprogress/mechtvprogress.htm
http://www.bretl.com/mechtvprogress2...vprogress2.htm
I had thoughts of building a camera, but never got to it. The receiver is on a shelf in my garage, but the power supplies, portable CD player and CDs are in a box somewhere that got separated in the move 6 years ago.
I tried to improve the sync separation of the simple circuit the club provided, to get frame sync as well as line sync, but discovered that there will always be a problem due to the low ratio of 30 or 32 between line rate and frame rate. I ended up with something that would sometimes frame sync, usually one line off, depending on video content.