Ian, G4ICV, AB2GR wrote > > That 70.4 Volts peak to peak is 12.4 Watts; my Heathkit meter is reading low. But probably within its tolerance. 10 watts would be ~63.2 volts peak to peak, so you're reading less than 1 dB high. How accurate is the scope? And how much do you need that dB? (grin!) Have fun! Cortland KA5S