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Links: Research on RF Theory

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Foreign Assessments of HD/IBOC
Links to Canadian, German, and European evaluations of iBiquity's proprietary technology. (October 2007)

HD Radio Digital Carrier Power Calculations
A Vice President of Engineering at Clear Channel ponders just how powerful AM-HD digital sidebands should really be. (2007)

HD Radio: My Tests
Neil H. Schubert exhaustively investigates AM-HD interference, with multiple multi-format examples of evidence. (2007)

IBOC Coverage and Interference Issues
PDF of a presentation given by engineer Doug Vernier on the potential pitfalls of HD-related interference both among and within stations. (2006)

SWR, Return Loss, and Reflection Coefficient
Explains the importance of SWR, from Wenzel Associates.

What is a Magnetic Loop Antenna
It's just a different form of energy that performs the same function.

Theory Discussion Index
Shedding light on the finer points of FM broadcast technology
.

RW Online - Better FM Coverage Index
Radio World conducted multiple interviews with engineering consultants about the best ways to design and maintain FM signal coverage areas. Focus on antenna concepts.

Power Line Communications and Amateur Radio
Amateur Radio Relay League's analysis of the interference concerns presented by broadband data transmission over power lines, significantly impacting nearly all HF signals.

Vertical Polarization and FM Transmitter Antenna Performance
Presented at the 21st Brazilian Congress of Broadcasting (1998).

AM Directional Antenna Essentials
Presented at the 2002 NAB conference, compares two of the most-used AM antenna system designs
.

Antenna Visualization
Very cool program lets you see an antenna's coverage pattern
.