High Anxiety From High Definition Tv

AS THE WIRELESS UNIVERSE EXPANDS, WEIRD NEW CASES of electromagnetic interference are surfacing. On Feb. 27, immediately after WFAA-TV in Dallas began its first transmission of high-definition television, 12 pocket-size heart-monitoring devices used by patients at nearby Baylor University Medical Center went on the blink. The devices relay electrocardiogram signals to a central station, where nurses monitor the patterns on computer screens. The nurses became alarmed when screens they were watching repeatedly went blank. Troubleshooters quickly traced the problem to the HDTV signals, which occupied the same slice of radio spectrum as some of the older heart monitors used at the hospital.

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