| Open Spectrum |
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| CATEGORIES ABOUT OPEN SPECTRUM | |
| wireless networking | |
| radio resource management | |
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National governments currently allocate bands of spectrum (sometimes based on guidelines from the ITU ) for use by anyone so long as they respect certain technical limits, most notably, a limit on total transmission power. Unlicensed spectrum is Decentralized : there are no license payments or central control for users. Traditional users of unlicensed spectrum include cordless telephones, and baby monitors. A collection of new technologies are taking advantage of unlicensed spectrum including Wi-Fi , Ultra Wideband , Spread Spectrum , Software Defined Radio , Cognitive Radio , and Mesh Networks . RADIO ASTRONOMY NEEDS Astronomers use many Radio Telescope s to look up at objects such as Pulsar s in our own Galaxy and at distant Radio Galaxies up to about half the distance of the observable sphere of our Universe . The use of radio frequencies for communication creates pollution from the point of view of astronomers, creating at best, noise, or at worst, totally blinding the astronomical community for certain types of observations of very faint objects. As more and more frequencies are used for communication, astronomical observations are getting more and more difficult. Negotiations to defend the parts of the spectrum most useful for observing the Universe are mostly carried out by the international astronomical community, as a grassroots community effort, coordinated in the Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science (IUCAF) . Relations between open spectrum advocates and radio astronomers are unclear. The open spectrum FAQ makes no mention of radio astronomy needs. EXTERNAL LINKS
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