of data transmitting and receiving. This is crucial to a safety and security-related system. To reduce the requirement for the adjacent channel ratio down to 65 dB or 60 dB – (see Table 6.14 in provision 6.4.9.2.1 of ETSI 300 392-2 V3.4.1). This option costs the quality of data transmission and reception to ensure the ideal system data rate, and obviously stronger coding and error correction are needed. This might be proper for applications for commercial purposes. 3) Further studies and tests are needed for the physical systems and prototypes in the real world. 6 Antenna spacing The antenna isolation (dB) be calculated with the formula: IReq transmitting power (W) Pt: receiver sensitivity level (dBµV); or = + 113 S: S Pmin(dB) receiver interference rejection index (dB). According to the standard of China, In: should be more than 100 dB. In The vertical isolation (dB) of two VHF antennas be calculated with the formula: IAV vertical distance from the top of the lower antenna to the bottom of the upper H: antenna (m). The horizontal isolation (dB) of two VHF antennas could be calculated with the formula: IAH horizontal distance between two VHF antennas (m). d: The following conditions should be implemented for ensuring the isolation of VHF antennas: The model and gain simulating scheme of an omnidirectional antenna for a coastal station is shown as Figs. A2-11 and A2-12. Figures A2-13 and A2-14 give the horizontal gain scheme and the vertical gain scheme respectively. A2-11 A2-12 The model of an omni-directional antenna for a coastal The gain simulating of an omni-directional antenna for a station coastal station
of data transmitting and receiving. This is crucial to a safety and security-related system. – To reduce the requirement for the adjacent channel ratio down to 65 dB or 60 dB (see Table 6.14 in provision 6.4.9.2.1 of ETSI 300 392-2 V3.4.1). This option costs the quality of data transmission and reception to ensure the ideal system data rate, and obviously stronger coding and error correction are needed. This might be proper for applications for commercial purposes. 3) Further studies and tests are needed for the physical systems and prototypes in the real world. 6 Antenna spacing The antenna isolation IReq (dB) be calculated with the formula: Pt: transmitting power (W) S: receiver sensitivity level (dBµV); or S = Pmin(dB) + 113 In: receiver interference rejection index (dB). According to the standard of China, In should be more than 100 dB. The vertical isolation IAV (dB) of two VHF antennas be calculated with the formula: H: vertical distance from the top of the lower antenna to the bottom of the upper antenna (m). The horizontal isolation IAH (dB) of two VHF antennas could be calculated with the formula: d: horizontal distance between two VHF antennas (m). The following conditions should be implemented for ensuring the isolation of VHF antennas: The model and gain simulating scheme of an omnidirectional antenna for a coastal station is shown as Figs. A2-11 and A2-12. Figures A2-13 and A2-14 give the horizontal gain scheme and the vertical gain scheme respectively. A2-11 The model of an omni-directional antenna for a coastal station A2-12 The gain simulating of an omni-directional antenna for a coastal station
R-REP-M.2371-2015-MSW-E.docx