radio window


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radio window

n
(Telecommunications) a gap in ionospheric reflection that allows radio waves with frequencies in the range 10 000 to 40 000 megahertz to pass from or into space
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Within that band, the so-called "radio window" of 70-100 GHz[3] is attractive because signals are relatively unaffected by passage through the atmosphere, allowing them to travel several kilometers or more.
The $75 million LOFAR project is scheduled to begin construction in 2004, deploying arrays of antennas as much as 400 kilometers apart to probe the radio window from 10 to 240 MHz at high resolution.