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Monday, March 06, 2006


HD Radio FM interference graph

For those with eyes to see, and the wisdom to understand.
The BLUE line is the digital interference created by the HD Radio broadcasting station interfering with the FM stereo subcarrier and surrounding FM stations.
GREEN is the reduced stereo signal to noise ratio.
RED -the two verticle lines at the top are the FCC 200kHz maximum limit for an FM station.
Beyond those two verticle RED lines at the top (to the right and left) is all the digital noise and interference created on neighboring channels by the digital signal.

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All charts are from documents submitted to the FCC for the public record (public domain) by the manufacturers, applicants, and proponents of the HD Radio iBiquty "IBOC" system.

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