The response on FM is from 400Hz-2700Hz, just measured it with my spec. It is also DSP limited. I think there is room for improvements. 73 Michael -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-AM-filter-on-receive-question-tp6688286p6741216.html Sent from the Elecraft mailing list archive at Nabble.com.