Amplitude modulated broadcast transmitter

Details Amplitude modulated broadcast transmitter Amplitude modulated broadcast transmitter

1987-11-12

1989-09-05

Griffin, Robert L.

Telecommunications

Transmitter

Amplitude modulation

455116, 332157, H04B 102, H03C 100

Patent

active

048646350

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 signal needed for controlling the additional modulator (18) passes through a delay circuit (16) and a correction circuit (17).

REFERENCES:
patent: 4058769 (1977-11-01), Alderman
patent: 4088956 (1978-05-01), Axman
patent: 4295106 (1981-10-01), Kahn
patent: 4449103 (1984-05-01), Kyrian
patent: 4481672 (1984-11-01), Watkinson
patent: 4633512 (1986-12-01), Kyrian
patent: 4646359 (1987-02-01), Furrer
Brown Boveri Review; vol. 72, No. 5; May 1985; "High-power Pulse Step Modulator for 500 kW Shortwave and 600 kW Medium-wave Transmitters"; W. Schminke; pp. 235-240.

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