| 摘要 |
The invention concerns a transmitter comprising a power tube (1) whereof the gate is excited by a variable phase signal through an energizer (2) and whereof the anode is amplitude modulated by a modulator (3) output signal. The phase and amplitudes of the signals respectively applied on the tube (1) gate and anode are representative of the phase and amplitude of the complex signal to be transmitted. In order that the amplifying characteristic of the transmitter in its entirety remains linear independently of the amplitude of the signal to be transmitted, the energizer (2) has a linear amplifying characteristic for low amplitude levels of the signal to be transmitted and operates in saturated mode when the amplitude of the signal to be transmitted exceeds a predetermined threshold. The invention is applicable to short-wave transmitters.
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