Quote:
Originally Posted by Dave A
The kit arrived and is problematic in this new version. Speed/sync are not good. Speed is too high for sync at the low end. The new 3 tab lens mount is not good compared to the original round lens mount. The instructions are from the original build...not this version. I have a note to Mindset and standing by for a response. A review after they respond.
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I played more with it. Its definitely Aurora mechanical scan type 4, 30 Hz NBTV. This was determined from the number of cycles on the sync disk (32) and the frequency of the signal across the LED on the test pattern.
The sync disk has one bar missing which will allow generation of horizontal (frame) sync (the fast/slow direction is the reverse of NTSC , 405, and other electronic).
Viewing the LED signal on the test card says it does have sync.
I tired to see if sync is bothered by room light ... apparently not, based on
the test pattern. Probably IR led/photocell.
I then remembered that somewhere I read that the CD had each little track repeated twice with reverse polarity, because CD players have no polarity spec. I noticed no difference when trying to sync various tracks.
Later today I will rip the CD to computer files and investigate further.
I will also try the Aurora. The Aurora is a pain to set, the manual is not clear on exactly how the buttons work and I don't want to lose the settings needed to make my real electronic Marconi 702 work right.
I'd love to see a schematic ... does it have DC restoration for the sync?