Hi Peter, Murray and Jim thanks for the suggestions and apologize for responding so late (lot of work in and around the yard. the ivy has no chance). I investigated the PA , the feeder and the aerial
Dear Uwe, LF Group, It certainly would be worth investigating where the apparent second harmonic distortion is coming from - assuming a reasonably balanced push-pull PA design, even-order distortion
From G3PLX: Uwe: I am not an expert on LF power-amplifiers (I worked on 10kW HF power-amplifiers 40 years ago but not recently), but it looks to me that the voltage and current waveforms of your home