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Masahiko YAMAZOE,Kazuhisa HAEIWA,Shoji HIROSE,Masayoshi FUKUMOTO,Hideo SATO 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We developed an evolutional wideband (3 to 26㎒) short-wave transmitter with an output of 1㎾ using PSM (Pulse Step Modulation) that digital (DRM: Digital Radio Mondiale) and analog AM modulation are possible. This equipment employs digital processed PSM method that high sound quality can be easily achieved in the modulation section and Class-E amplification for obtaining higher efficiency in the PA section composed of eight 125W PA. In addition, new output circuit for phase compensation of the load impedance. As a result, in the 125W PA, a drain efficiency of 95% at 3.925㎒ and 86% at 25.885㎒ was obtained. As analog AM characteristics, S/N of 54㏈ and above, distortion factor of 4% and under were obtained ranging from 3M to 26㎒. In digital modulation (DRM), S/N of about 24.5㏈ (at 25.885㎒ at 16QAM) that satisfies target performance sufficiently was obtained.