I rather not leave this project just now but i need to move on .
Going to stop work on the recorder mainly due to the stylus seems to be worn after spending a few days more testing ,i can see this in the recordings a bandwidth loss very much so on a reversing wave video.
Testing the problem it was not on play back i found a past recording that played back fine as i would of expected and this means it was on the record side ,checking it was not angle of record there was not much left but put it down to the Stylus .
Any case it will have to be on my to do list to get another from china when all this virus problem is over .
Something that surprised me as i wanted to do a few recording experiments one was recording very slow still worked 33 rpm .
Also i wanted to see speed difference in the video recording ,a very fast recording more than likely well over 100 RPM ,recording fast is easy but playing back was a problem in the past but no now i think because my stylus cartridges are the same ,you would think the tone arm would go flying but no plays very well.
The discs have that phonoVision look when you cram on the tracks ...second photo very large you can zoom into the tracks .
Below the end set up is pretty much lap top as the NBTV player video is fed that to a PWM circuit repurposed PWM laser modulation in this case ,then to a 100 watt amplifier feeding to the recording ceramic cartridge
Due to the Stylus problem i could not fully test my last circuit fault finding the the recording problem it made this all pointless till i can get it going again if i have a will .
Other tests i did was again 60 line and some other formats dreadful results on 60 line more so since i again lost bandwidth with the cartridge stylus thats me in out line so its not good but i wanted to try one last time before putting this away
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.