I believe that transitters for that frequency have to undergo certification testing per FCC part 80 or 87 depending whether it's a maritime or aviation application.

I also read that the modulation is limited to J3E (single sideband suppressed carrier) or H3E (single side band full carrier). This means that the modulating signal must be analog telephony.

Part 80 (maritime) requires that the minimum PEP be 60 W, I didn't check part 87 aviation to see what the minimum power requirement is there.

So I'm guessing that while this is something that could be put together and used in an emergency, it's not a viable option for wide spread use.