Steve Anderson wrote:Very interesting Harry. It's the first time I've ever seen the content that was put on the record.
But I wonder why it was recorded as an analogue baseband signal which suffers the same LF problems as NBTV. Why not a modified SSTV signal, say an FM sub-carrier of between 12-16kHz? That would cover the higher line/pixel count and the 'creatures' that found it would quite easily see the regularity in the line and frame frequencies.
A decent mastering machine can create recordings covering 16kHz or more, and the disc doesn't have to spin at our usual 33/45/etc. RPM. They only needed two copies so they may as well send the masters into space. The archive would be (is) on tape.
When this chap says 'That's it" and calls it a day, I wonder if he will get the specification and compare it with the results of his detective work. That's if anyone still has a copy of the spec. It was some 40 years ago.
Steve A.
They have put the pictures up for every one to view but seeing how it would have to be displayed is yes very interesting i was wondering what system was used as that was never explained at the time .
I would think back in the mid 70's the display device would have been something like a analog slow Phosphor CRT ,then again SSTV did have scan converters even for hams then so NASA might have gone that way ,I am not sure either why they went AM it does look more closer to a NBTV than FM SSTV .
I suppose what ever finds it will have no problems it is etched on the record how to play it and they kindly supplied a needle
BTW you can buy NASA Voyager Golden Record 40th Anniversary Edition Box Set Of 3 Vinyl LP .
https://www.ebay.com.au/itm/NASA-Voyage ... SwU91acY-~