> >Ahh. That's the best explanation I've heard for what causes > sub-harmonics. > >Thank you. > > > >Now where's the nonlinearity in the solid state PA's? from the > >nonlinear junction capacitance or the nonlinear ferrites? > In the devices, I think. The effect happens in VHF PAs without any > ferrite in them. Are you sure about that Steve? How often do you see it?73, Tom W8JI W8JI@contesting.com