One small correction to what Jim said: If the voltage for a given power under matched conditions is V, the maximum voltage with an SWR of 2:1 will be 1.414*V, not 2*V. Same for current: 1.414*I Steve G3TXQ On 01/08/2014 14:45, Jim Lux wrote: > 2:1 VSWR is double that, or around 800Vpk (for breakdown), and 11 Arms > (for thermal limits) >