NDLI: Development of a fully solid state wideband (3 to 26 MHz) short-wave transmitter of PSM modulation method using DC to RF conversion technology

Content Provider	IEEE Xplore Digital Library
Author	Yamazoe, M. Haeiwa, K. Hirose, S. Fukumoto, M. Sato, H.
Copyright Year	2009
Description	Author affiliation: Hiroshima City University, Hiroshima, Japan (Haeiwa, K.) \|\| NHK Engineering Administration Department, Tokyo, Japan (Yamazoe, M.) \|\| NIHON KOUSHUHA CO., Ltd., Kanagawa, Japan (Sato, H.) \|\| NEC Corporation. Broadcast and Video Equipment Div., Tokyo, Japan (Fukumoto, M.) \|\| Japan Broadcasting Corporation, Kagoshima, Japan (Hirose, S.)
Abstract	We developed an evolutional wideband (3 to 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 (at 25.885MHz at 16QAM) that satisfies target performance sufficiently was obtained.
Starting Page	409
Ending Page	413
File Size	349735
Page Count	5
File Format	PDF
ISBN	9781424447848
DOI	10.1109/APCC.2009.5375604
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-08
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio transmitters Digital modulation Pulse modulation Radio broadcasting Solid state circuits Wideband Frequency Amplitude modulation Chirp modulation Digital video broadcasting DRM Short-wave band All solid-state transmitter Wide band Class-E amplifier PSM
Content Type	Text
Resource Type	Article

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