08.19.2008 03:12 PM
Originally featured on BroadcastEngineering.com
Radio Frequency Systems introduces mobile TV-ready RF broadcast filters for collocated broadcast/mobile base stations

At the IBC2008, Radio Frequency Systems (RFS) will showcase three new mobile TV-ready additions to its family of broadcast RF filters. Specially designed for collocated broadcast/mobile base stations, the new filters — a 2kW and a 5kW low-pass filter plus a 0.6kW UHF bandpass filter with integrated low-pass filter — deliver premium RF performance across the 470MHz-862MHz band and prevent interference between collocated mobile TV and phone services.

A two-stage RF filtering process is required for collocating broadcast transmission sites with mobile base stations, said Dieter Pelz, RFS senior engineer “Mobile TV transmissions can produce natural harmonic signals that have the potential to interfere and degrade existing wireless communications networks, causing call drop-outs. Both DTV transmission mask filtering and low-pass filtering prevent the mobile TV signal harmonics and transmitter spurious signals from blocking cellular receivers."

RFS’s new 6PX80E bandpass filter with integrated low-pass filter provides mobile TV network operators with a two-in-one mobile TV filtering solution. The single unit provides a transmission mask through a six-pole cross-coupled bandpass filter plus low-pass filtering. The 6PX80E is rack-mountable for easy installation and retrofitting.

RFS’s new 2kW LPF8E4 and 5kW LPFS16E4 low-pass filters are highly selective, offering superior stop-band rejection performance. These low-pass filters reject unwanted frequencies up to 4.5GHz.

The insertion loss performance is typically 0.06dB for the two low-pass filters and 0.6dB for the bandpass filter. All are compact, easy to install and compatible with RFS’s other DTV and mobile TV broadcast RF filters and combiners.

See Radio Frequency Systems at IBC Stand D29, or visit www.rfsworld.com.

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