Interfacing a TNC to a UHF Micor
Check here to see how one person did it.
Information on Pre/De-emphasis can be found here.
For some more Micor information check here.
It is possible to take an 800MHz MICOR, and by changing the referance osc xtal, you can make the jump, no problem. Of course the RF deck will need to be re-tuned. The MICOR works at about 75% of rated power out, sensitivity is okay though.