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Monday, March 06, 2006

 

HD Radio-AM Jamming adjacent channel interference.

The grey and dark areas jam and trespass on adjacent stations.
Because of the square wave high duty cycle power of the digital waveforms they create 10 to 100 times more interference and jamming then similar analog signals on the same frequency.
Note the continuous digital hiss and destructive noise created by AM HD radio, that is impressed upon, and can be heard with the analog transmitting station's audio.
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"FCC Audio Division Chief Peter Doyle is quoted by the (Wall Street)Journal as explaining that broadcasters chose to go digital with Ibiquity's technology because it doesn't require new spectrum and that the advantages more than outweigh the shortcomings. Adding digital service is one way to combat the problem, although some small stations can't afford the cost."
The statement that "the advantages more then outweigh the shortcomings" is pure hype, metaphysics and predictive speculation.
The main reason the FCC was established, and it's continuing charge by congress, is to reduce and control interference, not to encourage interference.
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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