Ed, The KNB3 NB has to be enabled from the CONFIG menu. Just like you did for your KAT3 or KPA3 if you have those modules installed. 73, Mitch -- View this message in context: http://elecraft.365791.n2.nabble.com/No-IF-Noise-Blanker-tp7556479p7556497.html Sent from the Elecraft mailing list archive at Nabble.com.