Wirelessly posted (Mozilla/5.0 (BlackBerry; U; BlackBerry 9780; en-US) AppleWebKit/534.8+ (KHTML, like Gecko) Version/184.108.40.2060 Mobile Safari/534.8+)
I own a TK380 and it does(440-450MHz) ham band just fine, the software give me an OOB warning but allows the frequencies to be programmed. I would imagine the TK390 software is no different.
Interoperatablity is not a technology it is an attitude!!!