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Actually Gary I am speaking at a normal pace and it was the apparent speed increase that I first noticed when using the astronomy software to prepare the full-motion video. The same thing was undoubtedly happening with the earlier video, but it was not obvious because the images were not moving. I do know that the acquisition of the moving images had a 15 fps frame rate, so if the output AVI from VirtualDub was at 30 fps, the first iteration this evening will be to convert that back to 15 fps and see what it looks like.
I also made a full-motion/sound video using another piece of software but the same camera. I suspect that the exposure and the 15 fps frame rate were linked, so the black-bar artifact was more obvious and annoying. However, motion and sound sync were perfectly acceptable. I will look for that one and post a sample. More diversions as we sink into winter up here! Klaas, your math is impeccable and the task at hand is to find a mix that is as pleasing and hopefully as accurate as possible.
As far as my "Daily Express Televisor", that is a complicated story. I had one of Denis's kits and it was beautifully done. The left image (above) shows the first assembly of the mechanics, the only change being the use if one of Peter Yanczer's 32-line (Club Standard) discs. Denis provided the modern electronics to make it workable, but I was profoundly disappointed in the engineering of the original Daily Express system (not Denis's faithful reproduction). I wanted a classic open-frame televisor, but I was only going to build one Nipkow machine. It had to be robust and I intended to use it as a test-bed to investigate a variety of video and drive options. I ended us taking the two original motor support piers and modified then very slightly to mount a superb 12V DC permanent-magnet motor. It had a 1/4-inch SS shaft, double sealed ball bearings, and a 12 oz./inch torque rating.The motor is almost totally silent (the only noise the televisor makes is from the aerodynamics of the spinning disc (above, center image). The basic mechanics of the final system are shown in the right-hand image. The only Daily Express components are the two motor piers and the magnifying lens and its support. It is mounted on an attractive Acacia wood base (above, right). It works well as you can see and has provided the fodder for several contributions to the Club's Newsletter which are starting down the pipeline.
Ralph