Broadcast solutions group RFS is providing dual-channel mobile television service to the Southern Chinese province of Guangdong. Scheduled for completion in mid-2007, the Guangdong mobile TV project incorporates 42 separate RFS antenna systems, and represents the largest commercial mobile television network in the world to date.
With the Chinese government yet to establish a national digital transmission system standard, the success of the Guangdong mobile TV network is sure to provide a valuable reference point. GMTM also becomes one of the first service providers outside South Korea to adopt the digital transmission system by employing digital multimedia broadcasting (DMB) technology.
The complete VHF antenna solution represents an essential component of one of China 's first mobile television services, in this case those provided by mobile media company Guangdong Mobile Television Media Co Ltd (GMTM). Designed, installed and commissioned by RFS, the broadband antenna systems allows the transmission of two Band III VHF channels, delivering mobile TV to the handsets of urban and rural citizens of Guangdong. With transmission sites located in Guangdong ?s cities of Guangzhou , Foshan, Zhongshan, Dongguan, Shenzhen and Zhuhai, the country's latest broadcast installation is predicted to attract over three million viewers.
The 42 combined broadcast systems used to achieve this saturated coverage comprise a range of the latest RFS technologies. RFS 618 series side-mount dipole antennas or RFS 659 series panel arrays are being used to provide a precise broadcast signal to suit each site's individual broadcast environment. An RFS balanced combiner system (CA6PX180DAB) enables the RF combining of the two mobile TV channels broadcast from each site. The RF link between the transmitter and the antenna is achieved using 1-5/8-inch diameter Heliflex or Cellflex coaxial transmission line.
RFS Broadcast Product Manager China, Kimbo Zeng, explained the need for using two different antenna types: "The 659 series panel array allows a more tailored pattern coverage, like that required in the built-up environment of Shenzhen?The 618 series side-mount dipole antennas are used in the other Guangdong cities where a standard 270o or 360o horizontal radiation pattern (HRP) was required."
Stage one of the Guangdong mobile TV project was completed in May, with eight antenna systems installed across the major city centres. These support uninterrupted broadcasts of a range of information, sports and entertainment programs. Stage two is currently underway and is due for completion by the end of 2006, including an additional 13 antenna systems, with 21 antenna systems to follow in the third and final project stage in mid-2007.
With the 2008 Beijing Summer Olympic Games approaching and the 2006 World Cup contested earlier this year, the implementation of the mobile TV technology could not have come at a better time. "The first-stage network provided die-hard football fans with around-the-clock World Cup coverage, while the completed Guangdong mobile TV network will be fully operational in time for the 2008 Olympics," said Kimbo Zeng. Millions of Chinese sports fans won't miss a thing." * RFS is a global designer and manufacturer of cable and antenna systems plus active and passive RF conditioning modules, providing total-package solutions for wireless infrastructure. Its markets are OEMs, distributors, system integrators, operators and installers in broadcasting, wireless communications, land-mobile and microwave.