[Milsurplus] F-90/AIC

[Michael Bittner]

Does anyone have, or know a source of, a schematic diagram and input and output impedances of the F-90/AIC range/beam audio filter?

All of its filter elements are contained in a small hermetically sealed module.  I have several of these modules (they look like a typical mil spec audio transformer) and would like to put them to use, but I'm not sure of the pinouts on these modules.  
 
I have one complete F-90/AIC and have tried to reverse engineer it, but trying to follow the wiring between the filter module and the selector switch and between the several wafers on the selector switch is worse than an enigma machine.  And in any case, I don't know the connector pinouts for the complete unit.  There is plenty of information on the FL-5 and FL-8 filters on the web, but I find nothing on the F-90.  Help anyone?

Mike, W6MAB


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