Medium wave DRM field trials in Brazil – Some daytime and nighttime results in urban environment

Abstract: The Digital Radio Mondiale (DRM) system broadcasts audio in the frequency band below 174MHz . In this experiment in urban areas in Brazil, a hybrid signal composed of an analog AM signal and a digital DRM30 signal, with the same content, were broadcasted in diurnal and nocturnal transmissions. This paper describes the experimental setup, which employs the spectral shaping technique in simulcast transmission , and presents some results of medium wave propagation measurements campaigns that are being carried out in Brazil. The experiment is part of a series of field trials that are being conducted by the Brazilian Government which includes campaigns at MW, HF and VHF frequency bands. [Copyright &y& Elsevier]