Broadcasting with megawatts of power: the modern era of efficient powerful transmitters in the Middle East

摘要

A description is given of the 1- and 2-MW transmitters developed, built, and installed in the Middle East to satisfy requirements that provide for coverage of vast areas that can best be reached with high-power AM transmissions. The discussion also covers: early high-power developments; the Doherty high-efficiency screen-modulated amplifier; the overall power amplifier circuit and its operation; the modulator circuit; antennas; ground systems; and transmission lines. Of of the nine transmitters installed, four have already seen ten years of service and the remaining five are close to reaching a decade of dependable operation.