[Milsurplus] R-28/ARC-5 frequency multiplier scheme?

[jcoward5452 at aol.com]

Greetings all,
 I have two R-28's with the following crystals:

#1 has:
           A = 4550 kc
           B = 4970 kc
           C = 5570 kc
           D = 5660 kc

#2 has:
           A = 4775 kc
           B = 5660 kc
           C = 4970 kc
           D = 5375 kc

I'm guessing the total multiplication value is 26 as this puts these channels in the aeronautical band. Where there standard channel frequencies and  frequencies specific to NAS's?

It would be interesting to know where these were used based on the crystals installed or is this a futile question?
 
Thanks,
            Jay