seems to me that class D and E amplifiers should preferably be followed by a
low pass filter with a series inductor at the transmitter side.
Please correct me if my conclusion is not valid.
interesting question is whether a low pass filter is really necessary when the
transmitter feeds the aerial via a series tuning
A brief response is that all the inductor input LPF circuits I have tried
have either casused instability or fatal (for the FETS) voltages at the
I did try your idea of no LPF in the early days of 73kHz, and managed
to get a very nice 577 report from an amateur 2 miles away on 20m.