H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/04 (2006.01) H03F 1/02 (2006.01) H03F 1/32 (2006.01) H03F 1/33 (2006.01) H03F 3/189 (2006.01) H03F 3/24 (2006.01)
Patent
CA 2360335
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.
L'émetteur comprend un tube de puissance (1) dont la grille est excitée par un signal de phase variable au travers d'un dispositif d'excitation (2) et dont l'anode est modulée en amplitude par le signal de sortie d'un modulateur (3). La phase et l'amplitude des signaux appliqués respectivement sur la grille et l'anode du tube (1) son représentatifs de la phase et de l'amplitude du signal complexe à transmettre. Pour que la caractéristique d'amplification de l'émetteur dans son ensemble reste linéaire indépendamment de l'amplitude du signal à transmettre le dispositif d'excitation (2) présente une caractéristique d'amplification linéaire pour les faibles amplitudes du signal à transmettre et travaille en régime saturé lorsque l'amplitude du signal à transmettre dépasse une valeur de seuil déterminée. Applications: Emetteurs ondes courtes.
Robic
Thales
Thomson-Csf
LandOfFree
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