Delete comment from: Ken Shirriff's blog
JRD: I haven't looked at the Titan IMU (yet), but the computer's power supply is DC-to-DC, so frequency isn't an issue there. On the other hand, the 1201/1202 alarms that almost aborted the Moon landing were due to a phase difference between the computer's power supply and the radar's power supply. (Due to complicated reasons that usually aren't explained well, but CuriousMarc will make a video at some point.)
As far as the entertaining missile guidance story that you linked to, I don't know enough about guidance systems to tell how much of that is truth versus fiction. Autonetics did make gas-bearing gyroscopes for the Minuteman II, which matches the story's pseudonyms. But I couldn't find missile failures that match the story and the phase-locked loop business seems a bit implausible.
Mar 21, 2020, 6:18:31 PM
Posted to Inside a Titan missile guidance computer