Apollo CSM Guidance Computer Compensation Module

This module is a component of the Apollo CSM guidance computer and manufactured by AC Electronics. Anyone know more details about what this component did?

Comments

[Alan Erskine]

I asked in the sci.space.history newsgroup and got the following replies:

Found this on google...dinosaur computers aren't my thing tho...
http://klabs.org/history/apollo_11_alarms/eyles_2004/eyles_2004.htm

And

Can't give a complete answer, but hopefully can narrow it down a bit.
The "OPTICS" on the label indicates that this module was part of the
optics subsystem of the PGNCS, which on the CSM included the sextant and
the scanning telescope. The "800 CPS" means 800 Hz (Cycles Per Second),
which indicates this module was on the analog side of the loop. The
Apollo Guidance Computer (AGC) sent digital commands to the optics that
were converted to 800 Hz analog signals by the Coupling Data Unit (CDU),
which then went to the motor drive assembly (MDA) on the optics. The
shaft and trunnion angle resolvers on the optics in turn sent analog
signals back to the CDU, which converted them to digital and relayed
them to the AGC.

Since the CDU A-D and D-A channels were not dedicated to the optics, I
would guess that this module was installed on the optics side, not at
the CDU. Beyond that, I can't really guess what this module did
("compensated" for something, but what?), or where it fit into the
overall loop. The schematics I have aren't detailed enough to include it.

The sci.space group might be a place to ask any questions my might have.

Your sincerely

Alan Erskine
alan.erskine(at)bigpond.com
Australia

[David Meerman Scott]

Alan,

Many thanks for taking the time to ask your network about my artifact. I appreciate it. Mysteries are fun, especially when solved.

Best, David

[Duke]

Hi, I found this on google, if it's any help.
http://klabs.org/history/apollo_11_alarms/eyles_2004/eyles_2004.htm

[Jim Loocke]

Hi David,

I can tell you exactly where this module was used. This module belongs to a Block 1 Apollo Command Module Power and Servo Assembly ( PSA) Tray 10 . I can assure you this is correct as I have Tray 10 on my desk in front of me. If you have any questions regarding the PSA I have all 10 trays in my collection.

Take Care,

Jim

[helen]

wow!
so what it does exactly? LOL!

its really amazing what kind of computer they've used during that time. :)