Speaking of long time constant analog loops for oscillator disciplining,
see the attached PIX of the loop filter module from an FE AN/URQ-23.
Also a PIX of the schematic.
It is switch selectable for 1 or 100 Second time constants.
I is also hermetically sealed to prevent leakage effects as it uses a
2500 MegOhm resistor!
The Op Amp used is an AD515K.
I've played with it in the loop of an HP5065A.
Cheers,
Corby
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