I tried to make that point 2 years ago: http://www.eham.net/articles/19194 The article was unfinished and there is a follow up a few comments later. Ignacy -- View this message in context: http://elecraft.365791.n2.nabble.com/External-Power-Supply-for-the-KPA-500-tp4931334p5029940.html Sent from the [QRO] mailing list archive at Nabble.com.