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Mobile IFB Via 8-VSB Demonstrated

Well before the analog shutdown, Eric Small and the engineers at Modulation Sciences were working on technology to allow broadcasters to use their DTV signal to provide IFB audio to crews in the field. Modulation Science's analog PROceiver used the pro-channel on the analog subcarrier. The new Digital PROceiver uses broadcasters' existing digital transport stream.

Modulations Sciences recently tested its Digital PROceiver in the Midwest and Pacific Northwest in helicopters equipped with its new DSPversity antenna system. The tests showed the system worked on both high-VHF and mid-UHF DTV channels over widely different topography and flying conditions.

The DSPversity systems consists of a four-channel ATSC diversity receiver and a unique array of antennas. Modulation Sciences has a patent pending on the antennas. The company said that one special feature of the antenna ensemble is that no penetration of the fuselage is needed on most helicopters, reducing the cost and complexity of installation.

For more information, see www.modsci.com.

Doug Lung is one of America's foremost authorities on broadcast RF technology. He has been with NBC since 1985 and is currently vice president of broadcast technology for NBC/Telemundo stations.