Development of a Fully Solid State Wide band Short-wave Transmitter using PSM

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Other Title
  • PSM変調を用いた全半導体化広帯域短波送信機の開発(デジタル放送・デジタル設備,一般)
  • PSM変調を用いた全半導体化広帯域短波送信機の開発
  • PSM ヘンチョウ オ モチイタ ゼン ハンドウタイカコウタイイキ タンパ ソウシンキ ノ カイハツ

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Description

We developed an evolutional wideband (3M〜26MHz) short-wave transmitter with an output of 1kW 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 3.925MHz and 86% at 25.885MHz was obtained. As analog AM characteristics, S/N of 54dB and above, distortion factor of 4% and under were obtained ranging from 3M to 26MHz. In digital modulation (DRM), S/N of about 24.5dB that satisfies target performance sufficiently was obtained.

Journal

  • ITE Technical Report

    ITE Technical Report 33.25 (0), 1-4, 2009

    The Institute of Image Information and Television Engineers

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