The KAT500 following the radio by frequency is not going to happen but that would make a GREAT new generation auto tuner. IMHO Keith, XE3/K5ENS -- View this message in context: http://elecraft.365791.n2.nabble.com/KAT500-and-OT-Is-a-tuner-using-VNA-feasible-tp7567559p7567643.html Sent from the Elecraft mailing list archive at Nabble.com.