zz....I'm sorry, but we are getting way off topic. You are not understanding me. I realize all that you are saying. I know you can't just start talking on any freq. that you want to. I understand what range 1 means and its relationship with Motorola. I did misunderstand you when you were talking about the FRS and XTS5000.
I am a member of a FEMA USAR team. I am a communications specialist for the team. We DO NOT have a freq. that is assisgned to us for such operations. That is why I'm looking for a UHF frequency that is a mutual aid / common freq such as 123.45 but only in UHF. It doesn't have to be and air freq. I just need a freq. that I know that I can use to get by with until someone from the ups and ups can get there to coordinate my freqs for me. I don't want to get into a lot details, that is why I haven't answered all the questions. I figured this would be a good place to start.
Okay, in your first posting of this question, you asked for any frequency between 380.000 and 470.000 that left the door wide open and so some included FRS and other radios.
Apparently you want specifically to take a FM (portable) radio and use it to communicate from the Ground to a Federal Aircraft that has AM capabilities.
The aircraft needs to be equipped with an FM radio or you need to be equipped with an AM radio. It is also coordinated through NTIA for Federal Frequencies.
Otherwise it is not easily done with the radios you have and are talking about here.
It would be easier for you to add a VHF Air Band radio to your equipment, and when you need to communicate with aircraft, federal or otherwise, just use that to facilitate communications.
Now unless you are using the “it’s easier to beg forgiveness that to ask permission school” I don’t see you approaching this the right way. But I don’t and won’t work for the Federal government. But there are channels and procedures to follow. There is a guy who works for Clark Co. IN that could help you. PM and I’ll see if I can find his email address.