HD Radio coverage at the power levels most FM broadcasters are still using has been a challenge and some broadcasters are concerned about the higher digital power levels now authorized in most cases. Single Frequency Networks (SFN) are a possible remediation – essentially, booster stations operating on the same frequency as the main station. SFN technology is used for digital television in Europe and elsewhere.
The National Association of Broadcasters FASTROAD web site has just posted the results of a SFN test conducted by iBiquity Digital Corporation (owner of HD Radio technology) in the Baltimore area. The paper just linked is intended for an engineering audience, but iBiquity characterizes these early tests as “very encouraging,” stating:
iBiquity’s synchronized SFN Booster technology has the potential to not only extend an FM station’s HD Radio signal coverage to the protected contour, but also fill areas of compromised signal, well within the station’s coverage area.
Thanks to Radio Ink for the heads up. --Dennis