Nautel to Present a White Paper on the Benefits of Digital Adaptive Pre-Correction at NAB 2005

Bangor, ME (April 17, 2005) – Tim Hardy, Nautel’s Head of Development, will present his white paper “Improved Spectral Compliance for FM HD Radio Using Digital Adaptive Pre-Correction” during the HD Radio Technology portion of the Broadcast Engineering Conference, held during NAB 2005.

Hardy will give a detailed overview of digital adaptive pre-correction, and answer questions about the importance of this technique for maintaining HD Radio™ spectral compliance under changing environmental conditions.

The implementation of HD Radio has caused a great deal of discussion about the spectral re-growth problems that may occur when the digital 'sidebands' mix with the primary FM carrier frequency and create spurious signals on second, third and forth adjacent channels. Pre-correction systems can mitigate the effects of the transmitter system non-linearities that cause out-of-band emissions.

“Conventional fixed pre-correction techniques have not been able to ensure spectral integrity in a changing environment. Changes in VSWR, an adjustment in the output power of the transmitter, a change in amplifier temperature, or aging and failures of RF amplifiers can result in serious transgressions of the HD Radio mask and interference with other stations,” says Hardy.

Nautel’s M50 is currently the only exciter capable of providing an adaptive pre-correcting solution for FM HD Radio.

The presentation will be delivered at 5:30 p.m. , Sunday, April 17th at the NAB Convention Center , Room N110 in Las Vegas , Nevada.


About Nautel www.nautel.com
Nautel has earned an international reputation as a leader in the design and manufacturing of exclusively solid state radio transmitters. Since 1969, customers have put Nautel's transmitters in the field for AM broadcast, FM broadcast, and navigation assistance applications. Nautel products can be found in more than 160 countries, on every continent, and in climates ranging from arctic, to desert, to jungle.
Nautel is a licensed manufacturer of HD Radio transmission equipment and is an active member of the DRM Consortium.