Seems like what you are seeing on the image of the drives is part of this: https://www.haystack.mit.edu/tech/vlbi/mark6/index.html https://www.haystack.mit.edu/

Seems like what you are seeing on the image of the drives is part of this: https://www.haystack.mit.edu/tech/vlbi/mark6/index.html https://www.haystack.mit.edu/tech/vlbi/mark6/index.html Found it through this pdf: https://fskbhe1.puk.ac.za/people/mboett/Texas2017/Doeleman.pdf https://fskbhe1.puk.ac.za/people/mboett/Texas2017/Doeleman.p...