Walt, W2DU wrote:
"I don`t know about the energy storage in the filter you mention, but I
would assume that if the filter output is a sine wave then the energy
storage required to produce a linear output is sufficient."

As a former FCC official, Walt knows their regulations sharply limit
harmonic content of FM broadcast carrier frequencies. A sine wave must
be pure, otherwise it has harmonic content (not allowed).

Best regards, Richard Harrison, KB5WZI