The PRC-90 uses 282.8 and 243.9, the 243.0 is the primary emergency (military) frequency. Not sure, seem to remember the PRC112 uses the same plus another and an ID signal, unique to a specific radio/aircrewman.

The think your only option is a civilian amatuer radio or a PLB.
_________________________
No, I am not Bear Grylls, but I stayed at a Holiday Inn Express last night and Bear was there too!