1、CCIR VOLUME*X-3 70 = 4855232 0503978 O Rec. 599 121 RECOMMENDATION 599 DIRECTIVITY OF ANTENNAS FOR THE RECEPTION OF SOUND BROADCASTING IN BAND 8 (VHF) (Question 46/10, Study Programme 46L/10) (1963-1982) The CCIR UNANIMOUSLY RECOMMENDS that the characteristics of directivity of the receiving antenna
2、s of Fig. 1 can be used for planning sound broadcasting in band 8 (VHF). However, for portable or mobile reception of sound broadcasts, no directivity of the reception antenna should be applied in planning. Note 1. - O h g -10 - 20 O0 20 40 . 60 aoo moo Angle relative to direction of main response F
3、IGURE 1 - Discrimination obtained by the use of directional receiving antennas Curves A: monophonic-sound broadcasting B: stereophonic-sound broadcasting is considered that the discrimination shown will be available at the majority of antenna locat.ms in built-up areas. At clear sites in open countr
4、y, slightly higher values will be obtained. Note 2. - The curves in Fig. 1 are valid for signals of vertical or horizontal polarization, when both the wanted and the unwanted signals have the same polarization. Noce 3. - The Special Regional Conference, Geneva, 1960, and the European VHF/UHF Broadca
5、sting Confer- ence, Stockholm, 1961 and the African VHF/UHF Broadcasting Conference, Geneva, 1963, did not take the directional characteristics of antennas into consideration for sound broadcasting. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
