During broadcast radio’s first decade, little thought was given to transmitter efficiency. Main concerns of the industry were availability of broadcast spectrum (sound familiar?); keeping transmitter ...

SOUTHWICK, MASS.—Hitachi Kokusai Electric Comark LLC has a long standing history in the broadcast TV market. Comark started more than 40 years ago manufacturing RF components for UHF transmitters and ...

The world's first fully integrated Doherty amplifiers for TD-SCDMA and WCDMA base stations has been launched by NXP Semiconductors to expand the company's portfolio of RF power transistors. The ...

In a world of everything Doherty, there can be several variations on the standard Doherty amplifier architecture, in order to optimize the operation for different signal conditions. All of the ...

The Doherty Amplifier is used in an increasing number of radio transmitter applications to improve energy efficiency. This paper begins with an overview of Linearization and Efficiency Enhancement ...

Figure 1. Schematic of a Doherty PA Techniques such as Doherty amplifier structures extend high-efficiency device operation to lower power levels, allowing for significantly improved average PA ...

Your article (“KRLD’s Dougherty Transmitter,” July 1) discussed “the Western Electric 407A2 50 kW water-cooled Dougherty transmitter at KRLD in Dallas.” When I took my FCC first class radiotelephone ...