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

• Published in: Measurement : journal of the International Measurement Confederation 2012-11, Vol.45 (9), p.2237-2245
• Main Authors: Almeida, M.P.C., David, R.P., Souza, R.S.L., Castellanos, P.V.G., Cal Braz, J.A., Lima, M.V., Lima, F.F., Silva Mello, L.A.R.
• Format: Article
• Language: English
• Subjects: AM broadcast; Brazil; Broadcasting; Digital; Digital radio; DRM system; DRM30; Frequency bands; Governments; High frequencies; Medium wave; OFDM; Spectra; Spectral shaping technique; Wave propagation
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2012.03.012

► Field trials of DRM system in medium wave band were carried out in Brazil. ► Measurements of field intensity, audio quality and signal-to-noise ratio. ► Simulcast transmission of DRM signal and analog signal. ► Spectral shaping technique was employed during theses trials. The Digital Radio Mondiale (DRM) system broadcasts audio in the frequency band below 174MHz [1,2]. 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 [14], 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.