Broadcast staff from Dielectric Communications will host two radio presentations at the Broadcast Engineering Conference at NAB2007.
On Sunday, April 15 at 1:30 p.m., Technical Director Henry Downs will present “Isolation in IBOC Multi-Channel Systems: St. Louis’ Real-World Data.” Downs will discuss what the company describes as one of the most important parameters when designing an IBOC system: isolation between transmitters.
New solid-state digital transmitters have been shown to perform adequately with isolation as low as 40 dB, the company says; tube-type transmitters, however, exhibit minimal turnaround loss in band, and with isolation as low as 40 dB, this creates the potential for spectral re-growth. Based on data from an IBOC installation in St. Louis, Downs will demonstrate how the different isolation paths must to be analyzed together in order to help ensure spectral compliance.
At 3 p.m. on the same day, Vice President of Engineering Kerry Cozad presents “FM Digital Radio Implementation Update.” Cozad will highlight 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 low- and high-power systems to improve isolation between analog and digital signals while extending the usable bandwidth of existing antenna systems.
Booths: N7421, C1907