Can anybody suggest a forum or website to help me come up to speed a bit more on the Kenwood TK-5400? We have five of these at work on a digital, trunked 800 mHz system. So far, I can't even find anybody locally to program these! Are they essentially obsolete at this point? Is, or will, Kenwood still support these with parts and/or service for a while yet or "has that ship sailed"?