Recording NBTV on cassette tape.
Posted: Sun Jan 14, 2018 1:22 am
Hi Folks,
Its been a very long time since I posted on this forum due to the usual distractions of work, grandchildren etc but my interest in NBTV is still as keen as it was 35 years ago and I try and keep up-to-date via posts here and via the newsletter.
Anyway, browsing youtube for nbtv related matterial I stumbled upon this video entitled "128 line television on audio tape 3" and while the quality is not exceptional the method used to record the video seemed quite interesting.
If I understand correctly he recorded the video at 2 times normal speed onto a cassette tape and to circumvent the LF and DC offset issues he inverted the video of every other line. I have to admit I have not fully contemplated all the implications of doing this but it does seem a novel approach to the problem of recording NBTV signals and looks like an interesting alternative to using sub-carriers. The only complication would seem to be the synchronisation of the line switching to ensure the line phase is correct on replay.
I wonder, has anyone tried something similar and if so what sort of results did you get? Comments, thoughts?
Here is the video link and if you fast forward 50 seconds into the video we have a Star-Trek clip which is easy to recognise and evaluate...
https://www.youtube.com/watch?v=1kwWmaLkLVk
73,s and happy 2018 to all.
Monochrome (Des M0AYF)
Its been a very long time since I posted on this forum due to the usual distractions of work, grandchildren etc but my interest in NBTV is still as keen as it was 35 years ago and I try and keep up-to-date via posts here and via the newsletter.
Anyway, browsing youtube for nbtv related matterial I stumbled upon this video entitled "128 line television on audio tape 3" and while the quality is not exceptional the method used to record the video seemed quite interesting.
If I understand correctly he recorded the video at 2 times normal speed onto a cassette tape and to circumvent the LF and DC offset issues he inverted the video of every other line. I have to admit I have not fully contemplated all the implications of doing this but it does seem a novel approach to the problem of recording NBTV signals and looks like an interesting alternative to using sub-carriers. The only complication would seem to be the synchronisation of the line switching to ensure the line phase is correct on replay.
I wonder, has anyone tried something similar and if so what sort of results did you get? Comments, thoughts?
Here is the video link and if you fast forward 50 seconds into the video we have a Star-Trek clip which is easy to recognise and evaluate...
https://www.youtube.com/watch?v=1kwWmaLkLVk
73,s and happy 2018 to all.
Monochrome (Des M0AYF)