They emitted so much radio-frequency interference that Mr. Clark struggled to get a clear signal for the band's wireless instruments and in-ear monitors.

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As more customers sign up, service providers simply add more base-stations because all can use the same frequency without causing interference.

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Firms making third-generation mobile phones want their receivers to be highly frequency selective, so they can cope with their allotted frequency band without suffering from interference.

ECONOMIST: MONITOR

Developed for secure government communications, Spitfire uses a broad frequency spectrum virtually immune to eavesdropping or interference.

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Moreover, since the resulting interference pattern also depends on the waves' frequency, the same array can concentrate SAWs in different ways at different frequencies, working the liquid sample in different ways.

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For reasons that were never entirely clear, the Obama FCC granted frequency to LightSquared that had originally been designated for satellite use but only if they could overcome the technical issues of interference and if they could bring their network offering on line within a stipulated time frame.

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