>Whose formula may I ask? >What was the original message. > >Please do not alter the thread when responding You mean, please attach the whole thread when replying, and top post to boot, like most everyone else does ? No thanks, not me. I will keep altering the thread by clipping as much as possible, if you do not mind. You have to look up the op to whom I responded to see the formula. It was: SWR = 100 * (C+1)/(C-1) where C = sqrt(R^2/F^2) This is his formula, he asked how to calculate this. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads