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Author
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Topic: Rockwell unknown components from JSC (1977)
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tspang80
New Member Posts: 8
From:
Registered: Nov 2024
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posted 11-22-2024 04:36 PM
   
I recently acquired some components from the Johnson Space Center/NASA, and I’m hoping someone can help identify what they are and any historical information about them. All three are identical and have serial numbers 001, 002, 003 and the paper tag has a date of 1977. Any information would be greatly appreciated.  
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Jim Behling
Member Posts: 1953
From: Cape Canaveral, FL
Registered: Mar 2010
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posted 11-23-2024 01:27 PM
They were built under the shuttle contract. |
tspang80
New Member Posts: 8
From:
Registered: Nov 2024
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posted 11-26-2024 07:33 AM
Do you think submitting a FOIA request would help provide any information? I'm still reading/learning about the FOIA process. Thank you. |
Jim Behling
Member Posts: 1953
From: Cape Canaveral, FL
Registered: Mar 2010
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posted 11-26-2024 08:28 AM
Doubtful. The information would have be saved and in a searchable form.
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space1
Member Posts: 952
From: Danville, Ohio
Registered: Dec 2002
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posted 11-26-2024 02:55 PM
The placard says "Consists of the following units," and then "GO70..." which I think indicates Shuttle ground support or testing equipment. |
tspang80
New Member Posts: 8
From:
Registered: Nov 2024
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posted 11-26-2024 03:51 PM
Thank you for that information! |
David Carey
Member Posts: 1054
From:
Registered: Mar 2009
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posted 11-27-2024 11:06 AM
The labeling suggests to me that the boxes generally create an optimized interface between DC power source(s) and electrical load(s). Per Wikipedia "maximum power transfer occurs when the resistance of the load is equal to the resistance of the source" (impedance-matched).DC High/Low (I presume like '+ and -' since red and black) inputs could be ground supply from dissimilar sources (like a DC power supply and backup battery) with a remotely managed impedance-matched distribution to Preflight/Main Outputs for use by on-Shuttle power busses? From a NASA Shuttle Avionics publication Direct Current Distribution: Five classes of buses are used to control and distribute dc power. These include main dc, bus-tie, essential, control, and preflight test buses A picture with the jacks uncovered might provide more clues. 11/9/77 dating is after ALT (barely) but before orbital flights. Shuttle DC bus voltage standard was 28V but I don't see any markings on electrical ratings. Might be more than you cared about and I'm just spitballing. Jim/John may also have a more authoritative take on all that. |
tspang80
New Member Posts: 8
From:
Registered: Nov 2024
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posted 11-27-2024 12:43 PM
I'll take any info I can get!!! Please see picture below: |
David Carey
Member Posts: 1054
From:
Registered: Mar 2009
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posted 11-27-2024 01:19 PM
Yes, those are some pretty meaty single-conductor power input jacks. All speculative, but the two "plus" and two "minus" inputs sort of confirm the notion of two selectable DC sources distributed in controlled/matched fashion to the multiple busses of the outputs presumably for ground use by the spacecraft. |
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