The link below will take you to one of my favorite sites for builders and experimenters. www.qrp.pops Give it a look.. http://www.qrp.pops.net/qrp-java-calculator.htm While you are there, look over the entire site.. Darwin (Dar) Piatt - W9HZC Midwest HomeBrewer's and QRP Group http://www.hbqrp.org <http://www.hbqrp.org/>