Between them, Sprint and Nextel own nearly all the spectrum licences for the unused 2.5GHz frequency band.
The transmitter has a range of two meters to three meters, and operates in the unlicensed 2.4GHz frequency band.
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There is also concern that Bluetooth devices will conflict with those using 802.11b, since the two technologies share the same frequency band.
While the device uses the same radio frequency band as the upcoming personal area networking technology Bluetooth, it uses a different transmission protocol.
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This frequency is close to the lower band of the highest radio frequency band known as extremely high frequency which goes from 30 to 300 GHZ.
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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.
The 700MHz frequency band, currently used by digital terrestrial television, will be opened up to mobile services by 2018 as part of a global plan to harmonise frequencies for mobile users.
Only dogs were invited because the band played music on such a high frequency, only they could hear.
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The band was due to perform at the Frequency Festival in Austria on Saturday, followed by their second appearance at Bestival on the Isle of Wight in September.
The Pentagon feared the frequency structure being demanded by Brussels in the so-called Upper L Band between 1559 and 1591MHz could have prevented American commanders from degrading navigation data in the theatre of war to all but their own forces, as is possible at present.
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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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