AMPLITUDE-MODULATED TRANSMITTER WIH ANODE-B MODULATION

摘要

1. Amplitude-modulated transmitter with class B anode modulation, in which a low-frequency input signal is amplified in a class B anode modulator (5) and is fed to an output stage (3) for modulating a carrier oscillation, and in which a controllable rectifier (10) is provided for supplying power to the class B anode modulator (5), which controllable rectifier (10) is connected via a peak-value detector (8) and a subsequent processing section (9) to an LF input (7) for the low-frequency input signal and controls the supply voltage of the class B anode modulator (5) as a function of the envelope curve of the low-frequency input signal, characterised in that for a carrier control - first means are provided for controlling the anode voltage of the output stage (3) ; - second means are provided for deriving the envelope curve of the lowfrequency input signal ; - the second means are effectively connected to the first means in such a manner that the mean amplitude of the carrier oscillation is controlled in accordance with a carrier control characteristic in dependence on the envelope curve of the lowfrequency input signal ; - the low-frequency input signal amplified in the class B anode modulator (5) passes via a modulation capacitor (14) to the anode voltage input of the output stage (3) ; and - the output voltage of the first means passes via a modulation choke (13) to the anode voltage input of the output stage (3).