Talk:Ku band
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Band ranges
[edit]If the Ku-band starts at 11.7 GHz, how come I'm currently watching a "Ku-band" satellite channel on 10.714 MHz. Articles here claim that that's actually in the X band? --Kiand 03:31, 3 January 2006 (UTC)
Kiand... yes you are receiving a so-called Ku-band downlink at 10 GHz. Some Satcom engineers regard Ku band as starting at 10 GHz. The problem is that there is no clear formal definition (that I know of) of the band start and stop frequencies. Anyway, I've edited the article to clarify this point. MarkPos 05:35, 26 September 2007 (UTC)
- The microwave bands for radars are firmly defined, but RF communications engineers do not used these same definitions, but rather, a different but overlapping set. As for the radar bands, S-band is 2.0-4.0 GHz, C-band is 4.0-8.0 GHz, X-band is 8.0-12.0 GHz, and Ku-band is 12.0-18.0 GHz.
- In the Americas, which is an ITU region, communications engineers consider the Ku-band as beginning at 11.2 GHz. The 10.0 GHz is another arbitrary number from a different ITU region. By the way, "hertz" is always abbreviated Hz with the capital H, and mega is always abbreviated with M, a capital "m".
- This article is listed under the IEEE Radar Bands, According to [1][2], the spec[3], lists Ku as 12-18 GHz. That same page claims that for ITU region 2 (the Americas), Ku is 13.4 - 14.0 GHz and 15.7 - 17.7 GHz[4]. For http://en.wikipedia.org/wiki/Ku_band#The_Americas, are there available references to cite, or should it be changed to match the available references? Nmh (talk) 07:36, 16 October 2008 (UTC)
Kurz?
[edit]The {{verify}} is for the veracity of the German "kurz" etymology in K band. See also Talk:K band. —Fleminra 02:57, 14 February 2006 (UTC)
- Removed Kurz as unsourced and the tag as well.--Isotope23 16:29, 11 April 2006 (UTC)
- That "Kurtz" business is a bunch of baloney. The letters for the microwave bands derive from arbitrary letters of the alphabet that were assigned by the US Department of Defense, and a long time ago, their meanings were kept secret. Anyway, the letters that were used were L, S, C, X, and K, and then the K band was divided into three parts, the Ku (K-under), the K, and the Ka (K-above) band. So, "Ku" doesn't have anything to do with
- "kurtz", but rather with "K-under", and K is an arbitrary letter of the alphabet. In other words, it was a "code name". Furthermore, there are even higher Q and V bands, but these aren't used very much. Their frequencies are just too high to be practical now.
Ku-band in Austalia & Oceania
[edit]This article says very little about the use of the Ku band in the third ITU region. The Ku band is widely used in satellite communications and other applications in Australia, New Zealand, Japan, China, etc.
Ku-band in Indonesia
[edit]The International Telecommunication Union, ITU, has categorized Indonesia as Region P, countries with very high rain precipitation. This statement made many people unsure about using Ku-Band (11 – 18 GHz) in Indonesia. If we use frequencies higher than 10 GHz, then the hard rain occurred, it would cause a decrease in communication “availability.” This problem, actually, can be solved by predicting the suitable model that should be used when carrying out wireless communication link. Measurements of rain attenuation in Indonesia have been done for satellite communication links in Padang, Cibinong, Surabaya and Bandung. It has been found out, after due analysis, that the DAH Model for rain attenuation prediction is valid for Indonesia, besides the ITU Model. The DAH Model has become an ITU Recommendation since 2001 (Recommendation No. ITU-R P.618-7). This model can create 99.7% available link so that Ku-Band can be applied in Indonesia. The use of the Ku-band for satellite communications in tropical regions like Indonesia seems to become more frequent. Several satellites “parked” above Indonesia have Ku-band transponders, and even Ka-band transponders. Just look at the satellite owned by NewSkies (NSS 6), launched in December 2002 and positioned at 95° East, containing only Ku-band transponders and with a footprint directed to Indonesia (Sumatra, Java, Borneo, Celebes, Bali, Nusa Tenggara, Moluccas). This is also the case for the iPSTAR satellite, to be launched in 2004. The Ku-band footprint directed towards Indonesia has been named by Measat the “Ku-band for Indonesia”. Measat 4 is planned to cover the whole of Indonesia from West to East. This satellite will be launched by Malaysia in 2007. Asni Harismi 07:29, 30 March 2007 (UTC)
- This text seems to be a summary of [1], per talk on Talk:Ku-band in Indonesia. If so, that needs to be cited as source.
References
[edit]- ^ http://www.radioing.com/eengineer/bands.html
- ^ http://www.qsl.net/n9zia/radar-freq.txt
- ^ IEEE Std 521-2002 (Revision of IEEE Std 521-1984) URL only available to IEEE members
- ^ http://www.radioing.com/eengineer/bands.html
Clarification
[edit]I am a bit confused about the following line found in the disadvantages section: "Ka and Ku band losses can be marginally (but significantly) reduced using super-hydrophobic Lotus effect coatings.". How can something be marginally but significantly reduced? It either is marginally reduced or signifcantly reduced, not both. -- YiS, Jediwannabe 11:09, 28 January 2009 (UTC)
Ku band radar?
[edit]http://en.wikipedia.org/wiki/RQ-4_Global_Hawk#NASA links here in reference to 'Ku-Band Radar' but there is no mention of this technology on this page Drn8 (talk) 19:38, 28 December 2010 (UTC)
External links modified
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