Virdi admitted he could not explain how the letters had been produced by a user at Hanwell Police Station using his own secret password.

BBC: Gurpal Virdi

Adding some simple brains to the antennas on both sides of the conversation can make the signals between the base station and the user more direct.

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Both systems also support the HD Radio Artist Experience feature, which allows the user to view album art, station logos or other broadcast related graphics in addition to the displayed text information (when available).

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Arraycomm's approach allows the base station to constantly adapt the characteristics of the signal as the user moves around, keeping it focused, increasing spectrum efficiency and reducing interference from all the other signals permeating the air.

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This country has an estimated 220 gigawatts of what you might call amateur power: emergency generators, industrial fuel cells and other user-owned power plants, compared with 1, 000 or so gigawatts of central station capacity.

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