Are there any heating problems when Penelope is operated at the full 1/2W output level for continuous waveforms(ie CW, SSTV, etc)? Does the PCB provide any heatsinking for the OPA2674 chip? I am looking at using this same chip, or the OPA2677, as the final in my QSE board. Dave - WB6DHW <http://wb6dhw.com>