Looking at the power requirements for the IFR COM-120B they are:
90 to 135 VAC (50 to 400 Hz)
or
200 to 265 VAC (50 to 60 Hz)
or
12 to 30 VDC

I wonder if the step up/step down was done to meet all the possible 
supply voltages?

Joe
>
> > Actually, that's not goofy at all. Quite common, actually to
> > step up the rectified line voltage, then step it down again. 



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