White spaces (radio) | Wikipedia audio article
Channel: wikipedia tts
Date: 17/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/White_spaces_(radio)


00:02:20 1 White spaces devices
00:04:01 1.1 United States
00:06:15 1.1.1 Trade groups
00:07:52 1.1.2 Preliminary test
00:09:47 1.1.3 FCC decision
00:12:39 1.1.4 Broadcaster lawsuit
00:14:06 1.1.5 United States tests
00:16:37 1.2 Singapore
00:17:32 1.3 United Kingdom
00:17:49 1.3.1 Cambridge, United Kingdom tests
00:19:28 1.4 Canada
00:19:37 1.4.1 Industry Canada Consultation
00:20:22 1.5 Kenya
00:20:49 1.6 Namibia
00:21:33 1.7 South Africa
00:22:35 1.8 Argentina
00:23:14 2 Equipment vendors
00:23:38 3 See also



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SUMMARY
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In telecommunications, white spaces refer to frequencies allocated to a broadcasting service but not used locally.National and international bodies assign different frequencies for specific uses, and in most cases license the rights to broadcast over these frequencies. This frequency allocation process creates a bandplan, which for technical reasons assigns white space between used radio bands or channels to avoid interference.  In this case, while the frequencies are unused, they have been specifically assigned for a purpose, such as a guard band.  Most commonly however, these white spaces exist naturally between used channels, since assigning nearby transmissions to immediately adjacent channels will cause destructive interference to both.
In addition to white space assigned for technical reasons, there is also unused radio spectrum which has either never been used, or is becoming free as a result of technical changes.  In particular, the switchover to digital television frees up large areas between about 50 MHz and 700 MHz.  This is because digital transmissions can be packed into adjacent channels, while analog ones cannot.  This means that the band can be "compressed" into fewer channels, while still allowing for more transmissions.
In the United States, the abandoned television frequencies are primarily in the upper UHF "700-megahertz" band, covering TV channels 52 to 69 (698 to 806 MHz).  U.S. television and its white spaces will continue to exist in UHF frequencies, as well as VHF frequencies for which mobile users and white-space devices require larger antennas.  In the rest of the world, the abandoned television channels are VHF, and the resulting large VHF white spaces are being reallocated for the worldwide (except the U.S.) digital radio standard DAB and DAB+, and DMB.