Full Size Scophony Replica

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Full Size Scophony Replica

Postby McGee2021 » Wed Jul 05, 2017 10:13 am

I have started to design and 3d print a replica of the Scophony system, and thus far i have finished half of the slow speed scanner frame. I have sent files off for a 20 facet polygon mirror to be cnc milled. I am currently printing brackets to hold the 12 mirror to the frame, and afterwards will be printing the other half oth the frame. Each piece takes about 4 hours, and once asembled, the finished slow speed scanner will be 2 feet tall, and 3 feet wide.



Also, Andrew, could you move this topic to the construction diaries section?
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Re: Full Size Scophony Replica

Postby Harry Dalek » Wed Jul 05, 2017 10:35 am

McGee2021 wrote:I have started to design and 3d print a replica of the Scophony system, and thus far i have finished half of the slow speed scanner frame. I have sent files off for a 20 facet polygon mirror to be cnc milled. I am currently printing brackets to hold the 12 mirror to the frame, and afterwards will be printing the other half oth the frame. Each piece takes about 4 hours, and once asembled, the finished slow speed scanner will be 2 feet tall, and 3 feet wide.



Also, Andrew, could you move this topic to the construction diaries section?


Its a hard project ...its the end of the classic mechanical tv era ,i am not sure how you would go on the optics part and modulation of it if its a dead replica but if you replaced that with a laser you could do away with both the modulation a optics problem in one go ...you really need 3d printers these days for some thing like that ....i wish you well and am very interested in the project sounds like a big one !
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Re: Full Size Scophony Replica

Postby McGee2021 » Wed Jul 05, 2017 10:51 am

Harry Dalek wrote:i am not sure how you would go on the optics part and modulation of it if its a dead replica but if you replaced that with a laser you could do away with both the modulation a optics problem in one go ...you really need 3d printers these days for some thing like that ....i wish you well and am very interested in the project sounds like a big one !


I am planning to use the laser, but i am still currently working on the jeffree cell that i started making a few years ago. it has been a slow going, non stop project, that i have recently sped up a bit. If i get the laser to work, than i will probably move to the jeffree cell after that. I have managed to get a typical sized 10 mhz crystal to work, by scaling down the jeffree cell to about half the original dimensions, and have not tested it this far as to see if it will produce results.
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Re: Full Size Scophony Replica

Postby Harry Dalek » Wed Jul 05, 2017 8:15 pm

McGee2021 wrote:
I am planning to use the laser, but i am still currently working on the jeffree cell that i started making a few years ago. it has been a slow going, non stop project, that i have recently sped up a bit. If i get the laser to work, than i will probably move to the jeffree cell after that. I have managed to get a typical sized 10 mhz crystal to work, by scaling down the jeffree cell to about half the original dimensions, and have not tested it this far as to see if it will produce results.


Its a hard one Johnrpm looked into this a few years ago as well ,i don't know if you have reviewed the forum but heres the link
viewtopic.php?f=1&t=1366&hilit=jeffery+cell
Some info on Scophony here as well.
Yes wise to go with the laser so much easier without all the optics ,you need a laser without the regulator circuit as that will just filter out the video ,it was my big mistake trying a mirror drum idea years back now .just use the laser diode /
2 drum mirror drums are easier to get going than a standard mirror drum which is a pain all you have to do is get the line mirror drum to correct sync speed and with just about any speed the framing mirror will at least give you an image from slow speed up as far as aspect ratio and and correct framing speed that you can work out later ,i have done all this with manual speed controls so syncing like that is even possible .
You will get it going you will more than likely need a more powerful laser more lines dimmer the raster and this gos beyond any thing i have ever tried remember distance drops that as well ...there are perhaps 2 or 3 i know that have tried the idea for 525 625 line mechanical mirror drum television running at every 2nd line so half that line rate .also with 2 drums you can have a multi system monitor well worth working on it .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Full Size Scophony Replica

Postby McGee2021 » Thu Jul 20, 2017 10:49 am

I've picks up the 12 mirrors, they cost me about 80 dollars. The weight of them all combined has me rethinking the clips to hold them in place, I will be printing them as soon as some new filament for my printer arrives.
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Re: Full Size Scophony Replica

Postby Andrew Davie » Thu Jul 20, 2017 11:19 am

McGee2021 wrote:Also, Andrew, could you move this topic to the construction diaries section?


Just spotted that. Moved!
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Re: Full Size Scophony Replica

Postby Panrock » Fri Aug 04, 2017 2:24 pm

This is a very ambitious project and I wish you the best of luck with it.

The only surviving remnant of an original Scophony receiver is - I understand - a line scanning motor assembly at the National Media Museum, Bradford. You may already know about this. If you are in the UK, they might let you take a look...

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