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08-Jun-2007 Print page

RFS wins nationwide UHF TV expansion project in Vietnam

Broadcast solutions group, Radio Frequency Systems (RFS) has been appointed by Vietnam’s national television broadcaster, Vietnam Television (VTV), to provide the complete RF systems for a 12-site network expansion of the country’s analog television network. Comprising upgrades to 12 existing VTV sites, the 2007 upgrade program will see coverage of the country’s science, technology and education channel, VTV2, and its sports and entertainment channel, VTV3, extended nationwide. Selected in open tender, RFS will supply complete end-to-end passive broadcast solutions, comprising broadband UHF and VHF antenna systems, UHF channel combiners, RFS HELIFLEX flexible air-dielectric coaxial transmission line, patch panels, plus rigid transmission line and RF accessories. The company will also be fully responsible for RF system design, site commissioning and training of VTV personnel. According to RFS Area Sales Manager, Ivor Richardson, the precision pattern tailoring required for a number of the antenna systems located in the country’s mountainous north is a key challenge on the VTV2/VTV3 expansion project. All antenna systems are to be based on RFS’s renowned PHP broadband panel system, which provides a uniquely modular approach to the development of antenna arrays and supports the entire UHF band (470 to 860MHz). “The project comprises a total of nine new PHP-based antenna arrays, which will range in power ratings from 16 to 32kW,” Richardson said. “RFS worked closely with VTV over the past two years to help it resolve its requirements--it became clear quite early on that precision pattern tailoring would be required at the three northernmost sites, Lao Cai, Hoa Binh and Mong Cai. We’ve elected to use unequal power splits to achieve the required radiation pattern, rather than ‘thinned arrays’ where the number of panels are varied on each face. For these cases, the unequal power splitting provided better control of the antenna’s vertical and horizontal patterns, which is of key importance at these sites.” Channel combining on both the new and established VTV sites will be achieved using a total of seven new two- and three-channel combiner systems, based on RFS’s CA UHF balanced coaxial combiner series. The seven broadband combiner systems will comprise a total of 13 combiner modules, used to combine a total of 20 channels in a mix of power capacities of 5 and 10kW. Supporting the entire UHF band, the extremely compact CA series combiner provides optimal system development flexibility, by allowing modules to be connected to the chain, providing a multi-channel combiner that can support eight or more channels. The expandability and broadband nature of the 12 complete VTV2/VTV3 broadcasting systems will prepare the network for the next phase of its expansion--the planned national deployment of channels VTV6 and VTV7 in 2008. Importantly, all 12 broadcast systems will be completely DTV-ready, so all sites will support Vietnam’s ultimate transition to digital television broadcasting The project scope also includes training of VTV personnel, both in Vietnam and at RFS’s Broadcast Centre of Excellence in Melbourne, Australia. This will be conducted during the course of 2007. Final commissioning of all 12 sites is scheduled to be completed before the year’s end. To learn more of RFS’s wide-ranging digital and analogue broadcast solution set, visit RFS at BroadcastAsia 2007, stand 8H3-01, Singapore Expo Hall No.8, 1 Expo Drive, Singapore, 19 to 22 June 2007.

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