NAB Radio Update - Aug 26, 2008


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Eye on IBOC

IBOC Technical Panel Featured at NAB Radio Show
Technical experts will discuss the impact of an in-band-on-channel (IBOC) proposal recently submitted by radio broadcasters to the FCC at The NAB Radio Show. Geoffrey Mendenhall, vice president of transmission research and technology at Harris Broadcast Systems, will moderate the panel discussion featuring executives from Continental Electronics, Broadcast Electronics, Nautel, Greater Media and NPR.

The proposal would allow FM broadcasters to increase power in the digital portion of their IBOC signals by up to 10dB, to increase their digital coverage area and to improve reception by portable HD Radio receivers which are soon to be on the market. Attendees will learn how to design new facilities to operate at these higher power levels, and will also examine the issues surrounding the upgrading of existing facilities. Session participants include:

  • Geoff Mendenhall, currently responsible for the research and application of new technologies to Harris radio and television transmission products.
  • Jeff Detweiler, broadcast technology manager of Ibiquity Digital. Detweiler manages the introduction and launch of the company's HD Radio brand of IBOC technology to radio stations worldwide.
  • Dan Dickey, vice president of engineering with Continental Electronics Corporation, where he oversees research programs and new product development.
  • Ted Lantz, serves as manager of HD radio products for Broadcast Electronics. He is responsible for the HD Radio Transmitters and data management suite, Radio Data Dimensions System.
  • Gary Liebisch, an active member of the Society of Broadcast Engineers for more than 25 years. He joined Nautel in April 2007 as the Eastern U.S. regional sales engineer and manager, focusing on product development.
  • Milford Smith, vice president of radio engineering for Greater Media, a position he has held for the past 24 years. He is active chairman of the NAB Digital Radio Committee and chairman of the National Radio Systems Committee.
  • Mike Starling, joined NPR in 1989 as a senior engineer and was named vice president for engineering and operations in 1998. Currently he is VP and CTO of NPR and in Executive Director of NPR Labs.

    Products from the Floor

    Digigram LX1616ES
    PCI network sound card
    Booth 624
    The LX1616ES can transmit and receive up to 16 Ethersound channels, thus connecting computer-based audio applications to a 100Mb/s Ethersound network via a single CAT5 cable. The LX1616ES is the perfect choice for direct-to-disc applications that don’t necessarily require as many as 64 channels, but still require maximum flexibility to play and/or record selected ES-100 audio channels using just a single CAT5 cable. A scaled-down version of the LX6464ES, LX1616ES offers an ideal starting point for price-sensitive applications, particularly since it can be upgraded on the fly from a 16/16 channel count to 32/32, 48/48 up to 64/64 through simple firmware updates. In a live sound environment, the combination of a PC equipped with an LX1616ES soundcard and an Ethersound-enabled digital mixing console results in an extremely powerful, high quality and extraordinarily cost-effective multitrack recorder.


    Broadcast ElectronicsFXi 60/250esp
    Digital exciter
    Booth 301
    The FXi 60/250esp exciter is the BE's latest FM exciter with direct-to-channel FM carrier generation. It includes features such as digital adaptive correction, dual RF outputs for redundancy, Ethernet IP control and more. Broadcast Electronics' new exciter, available in 60W and 250W versions, will come standard in its FMi T and FMi HD Radio transmitter lines and as an upgrade option for its FM T, C and S Series transmitters. New features and functions of the FXi 60/250esp exciter include: New ESP digital adaptive correction provides for greater efficiency and overall best RF output mask compliance. ESP corrects any linear and nonlinear distortions for the transmission system, providing adaptive correction for FM + HD and HD Radio, and corrects for group delay in a multi-station, combined antenna application. Dual RF outputs – one exciter can drive two transmitters, a separate HD Radio transmitter and an FM transmitter or a backup and main transmitter. Plus, the new FXi 60/250esp offers dual AES/EBU inputs with True Silence Sense for primary and backup audio inputs.


    Vorsis AP2000
    Signal Processor
    Booth 413
    The AP2000 is the successor to the Vorsis AP1000 31-band audio processor. Essentially a complete redesign of the original product, the AP2000 hardware is equipped with 30 percent more DSP horsepower, a completely overhauled five-band AGC, new voice distortion management technologies and a new, high-performance distortion managed clipper. The five-band AGC now incorporates Sweet Spot Technology (SST), a Vorsis exclusive, which manages the behavior of the five-band AGC in real time to ensure that it always operates within its ‘Sweet Spot’. Unlike broadband AGC algorithms of the past, SST is a completely new way to manage the five-band dynamics controller to maximize the consistency of the station's on-air presentation, no matter what the source material or audio levels from source to program source.




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