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 ...

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 ...

With the successful widespread deployment of Doherty amplifiers in cellular base stations, specific and dedicated devices should be considered to further improve performances and cost of the complete ...

In general terms, power amplifiers (PAs) used in communications systems must be large enough to amplify envelope peaks. This leads to amplifiers designed to offer the best efficiency at peak power ...

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 ...

A new family of UHF digital TV transmitters from NEC is on show at IBC, taking advantage of power-saving Doherty amplifier technology and offering impressive energy efficiency as a result. The high ...

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 ...

Although the class B linear amplifier provides a simple and effective means for amplifying a modulated carrier, its low carrier efficiency is a definite disadvantage, particularly where high power is ...