Saab R5 Operation & Installation Manual
Also see for R5 SUPREME AIS: Operation & installation manualInstructionOperation & installation manualInstallation Short InstructionInstallation Short Instruction
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Contents
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R5 SOLID AIS SystemINSTALLATION7000 118-200, C2 Page 17Figure 8 – Combined VHF / GPS Antenna – AC Marine3.5 Mount the R5 SOLID Transponder’s VHF antennaThe R5 SOLID, like any other ship borne transceiver operating in the VHF maritime band,may cause interference to a ship’s VHF radiotelephone. Because AIS is a digital system,this interference may occur as a periodic (e.g. every 10 second) soft clicking sound on aship’s radiotelephone. This effect may become more noticeable when the VHFradiotelephone antenna is located close to the AIS VHF antenna and when theradiotelephone is operating on channels near the AIS operating channels (e.g. channels27, 28 and 86).Attention should be paid to the location and installation of different antennas in order toobtain the best possible efficiency. Special attention should be paid to the installation ofmandatory antennas like the AIS antennas.So, installing the AIS VHF antenna is also a crucial part of the system installation. Howand where you install your AIS VHF antenna and cable will affect its efficiency.3.5.1 VHF Antenna LocationLocation of the mandatory AIS VHF antenna should be carefully considered. Digitalcommunication is more sensitive than analogue/voice communication to interferencecreated by reflections in obstructions like masts and booms. It may be necessary torelocate the VHF radiotelephone antenna to minimize the interference effects. Installingthe VHF antenna for AIS on a vessel is a compromise between the following items: Antenna type Antenna separation Clear view of the horizon Antenna height3.5.1.1 Antenna TypeThe AIS VHF antenna should have Omni directional vertical polarization providing unitygain.3.5.1.2 Antenna SeparationAIS transponders use simplex channels at frequencies on the high side of the marinemobile band (AIS channel A = 2087, 161.975 MHz and AIS channel B = 2088, 162.025MHz). These channels are close to the duplex channels used for shore to ship marinecommunication. The AIS VHF antenna should be separated as much as possible from |
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