查看文章

The results of an extensive study on analog PAL signals interfered with by digital DVB-T signals are presented. The research work covers field measurements, laboratory measurements, a theoretical evaluation of the interference problems and a national survey among TV installation companies. The main objective is the identification and explanation of the interference problems reported since the start of DVB-T broadcasting. The report is organized in two parts. This paper, part I, describes the field measurements, whereas the laboratory measurements and the poll results are described in part II (see Acuna, M.A. et al., ibid., p.116-22). It has been found that the frequency plan is part of the source of the interference problems, particularly in the case of cochannel interference. Another source of problems is use of different radiation elements at the same site for broadcasting DVB-T and analog TV signals. As stated in …