Gregory's Serverfinally got the "Analog Digital Converter" opened up. it's rather complicated! there are multiple absolute encoder wheels connected with a gear train.
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 since i had the gearbox all opened up i counted more teeth and figured out that the coarse-to-fine synchro ratio is actually 1:11, not 1:12 as i previously thought. @tubetime 1:11 isn't like any encoding altimeters I've seen but I'm still betting on an analog synchro to digital Gillham code converter. @bikerglen the Air Data Computer that Ken has been busy with uses the 1:11 ratio as well. i think this unit is from the same avionics system and is designed to be connected to one of the computer's outputs. maybe altitude. this is going to be a real pain to reassemble. I've put in springs to put tension on the backlash mechanisms. so I got everything lined up and the top plate reinstalled. I just have to pluck out the springs and tape. yep, that was a pain. but it is back together, and I have all the connector pinouts! the potentiometers are not all linear relative to position. fascinating.  @tubetime it's probably difficult to make them completely linear @tubetime its typical to see 'log' pots consist of two or three different gradients like you see on the orange line here. Whats most interesting to me is the 'deadzone' of the green pot I don't think I have seen that before |
tiny brushes on an encoder wheel.