Perth also reduced the power of the transmission to make it more like the sort of faint X-band signal the craft would expect to hear at Mars.

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Women's groups marched through Nairobi's city centre to the sound of a wind band to signal the opening of the year-long campaign.

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"There have been many claims about home systems and products that use the same radio signal band as Wi-Fi, " Koss continued.

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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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For example you might have Texas Instrument or TI which is the biggest supplier in the base-band market or DSP (Digital Signal Processing) but still have competition from the likes of Lucent, Motorola, Qualcomm.

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