Here is what I have gathered from various YouTube and Hackaday comments. If you discovered any of these details, let me know and I will add you as a contributor.
The numbers in "testblock 1" are hex for "I'm floating in a most peculiar way", a reference to the David Bowie song Space Oddity.
It looks like the mysterious text on the April fools day transmission had a QR code embedded in "testblock 2":
The QR code leads us to the following link http://hackaday.io/hacker/3935: Wouldnt you know it, Major Tom has a profile on hackaday?
The second transmission gives a string of numbers in the video. This string of numbers is an IP address given in its decimal form. Converting back to IP format we get the IP address: 54.241.0.25.
This address is a Telnet server, but the login and password are still unknown.
There are also images hidden in Transmission # 2 that show Bob Widlar and one of his famous circuits.
Image of Bob Widlar:
Image of Widlar's Current Source schematic:
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https://mapsengine.google.com/map/u/1/edit?hl=en&authuser=1&mid=zzchyzRd4tfQ.kDU31N8upPz4
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http://www.knig0lub.com/uploads/news/SpaceOddity_AndrewKolb.pdf
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http://hackaday.io/hacker/4053
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First landing on the moon.
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http://hackaday.s3.amazonaws.com/status.jpg
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