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Performance of the amplifier output filter. Frequency spectrum of RF output signal shows 3rd harmonic attenuation less than −25 dB (a). Four different types of modulated RF pulses (saw, square, sinc and gauss) measured by a pick-up loop coupled to the coil (b). Sinc pulses of increasing bandwidth and peak amplitude corresponding to approximately 3 A peak output current (c). No corrections to the RF envelope were performed in (b) and (c).
