Dialectric RF executive James York will discuss the legacy equipment issues broadcasters are facing as they work toward the transition from analog to digital TV, during an NAB presentation.
Broadcast experts from Dielectric Communications, a division of SPX and a leader in broadcast antenna systems, have been selected to host three presentations at this year’s NAB Broadcast Engineering Conference in Las Vegas.
The presentations are designed to educate attendees at NAB, the world’s largest electronic media show, on issues pertaining to the transition to both HD radio and digital television.
On Sunday, April 15 at 9:30 a.m., Dielectric RF technical sales manager James York will present “Analog RF Systems: Uses in a Digital World.” This topic will explore the legacy equipment issues that broadcasters are facing with the transition to digital TV.
York will detail many of the options and limitations in retuning, reusing, or reallocating analog RF systems for DTV applications. In addition, York will discuss the feasibility, timing, and site restrictions that may limit the broadcaster in choosing to repurpose analog RF equipment.
At 1:30 p.m. on April 15, Henry Downs, technical director for Dielectric, will present “Isolation in IBOC Multi-Channel Systems: St. Louis’ Real-World Data.” Downs will guide attendees through a discussion of one of the most important parameters when designing an IBOC system: isolation between the transmitters. New solid-state digital transmitters have been shown to perform adequately with isolation as low as 40 dB.
Tube-type transmitters, however, exhibit minimal turnaround loss in band, and with isolation as low as 40 dB, this creates a very real potential for spectral regrowth. Based on real-world data from an IBOC installation in St. Louis, Downs will demonstrate how all of the different isolation paths have to be analyzed together in order to help ensure spectral compliance.
Dielectric will contribute to the Broadcast Engineering Conference later in the day when Dielectric vice president of engineering Kerry Cozad presents an “FM Digital Radio Implementation Update” at 3:00 p.m. Cozad will highlight several examples of installed IBOC systems and provide measured data on various equipment configurations.
As part of his discussion, Cozad will focus on the use of circulators for both low- and high-power systems to improve isolation between analog and digital signals while extending the usable bandwidth of existing antenna systems.
“It’s an honor to again be selected by NAB to educate its members and guide them through new developments and potential sticking points in the transition to digital radio and television,” said Dielectric vice president of sales Jay Martin. “We encourage attendees to take advantage of the expertise of Dielectric and the many other qualified speakers taking part in this year’s Broadcast Engineering Conference.”
Additional information on these presentations can be found on the NAB Web site at www.nabshow.com.