I need a DX-100 manual copy. But weren't there different versions of = this TX? Are the differences such that I need to make sure the manual I = get matches the version I have? How do I tell which version I have? This one also has an unoriginal knob in the center below the dial. If = anyone has an original knob, I could use that too. Thanks. 73, Don Merz, N3RHT