Amplitude modulated broadcast transmitter (US Patent 4864635)

Patent number: 4864635 Granted: 1989-09-05 Filed: 1987-11-12 Inventors: Bohumil Kyrian (Unterbozberg, CH); Wilhelm Tschol (Fislisbach, CH) Assignees: BBC Brown Boveri AG (Baden, CH)

Abstract

In an AM broadcast transmitter having a switching amplifier as main modulator (12), an additional modulator (18) is used in the radio frequency circuit in order to achieve a steady 100% modulation at the modulation minima, with the aid of which additional modulator the carrier signal is also modulated at the modulation minima. The LF