Graziano, not so much info about that but what I found on Elecraft pages is: KAT1 F/W Upgrade to 1.3. "Increases matching range for loads that caused PLO message." ----- 73 - Petr, OK1RP "Apple & Elecraft freak" B:http://ok1rp.blogspot.com G+:http://goo.gl/w3u2s9 G+: http://goo.gl/gP99xq -- Sent from: http://elecraft.365791.n2.nabble.com/