Wayne, So is the KX3's receiver performance as measured by Sherwood Engineering with the optional filter? Keith Ennis -- View this message in context: http://elecraft.365791.n2.nabble.com/Curious-why-is-KXFL3-roofing-filter-an-option-on-KX3-tp7586967p7586971.html Sent from the Elecraft mailing list archive at Nabble.com.