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The middle portion of K-Band is a bit of a mystery.Other than a mention of K-Band radar there are few references on the Internet to it's use.
Being a relatively low frequency, L-band is easier to process, requiring less sophisticated and less expensive RF equipment, and due to a wider beam width, the pointing accuracy of the antenna does not have to be as accurate as the higher bands.When the vessel relocates, it will need to change to a different satellite and a different satellite beam.Only high traffic areas are covered with Ku-Band, with the first Transatlantic beam becoming available in 2009.This has resulted in serious restrictions within 300Km of the coast, requiring terminals to be turned off when coming close to land.refers to the lower portion of the K-Band.The "u" comes from a German term referring to "under" whereas the "a" in Ka- Band refers to "above" or the top part of K-Band.Ku-Band is most commonly used for satellite TV and is used for most VSAT systems on yachts and ships today.
There is much more bandwidth available in Ku -Band and it is therefore less expensive that C or L-band. The wavelength of rain drops coincides with the wavelength of Ku-Band causing the signal to be attenuated during rain showers.
The older Inmarsat A and B antennas were typically 1 meter in diameter, but, with the launch of more powerful satellites and the use of steerable spot beams, the new Fleet broadband antennas are down to less than 30cm (12 inches).
L-Band is also used for low earth orbit satellites, military satellites, and terrestrial wireless connections like GSM mobile phones.
Lately this process has been improved with a transatlantic beam on Telstar 11n, and the satellite terminals and modems being programmed to automatically switch beams.
VSAT Antenna sizes typically range from the standard 1 meter, like the Sea Tel 4009, to 1.5 meters for operation in fringe areas and, more recently, as low as 60cm for spread spectrum an extremely high frequency requiring great pointing accuracy and sophisticated RF equipment. It is commonly used for high definition satellite TV.
The advantage of the Inmarsat solution is that it will be global, seamless, much smaller antennas, and should be much cheaper that Ku-Band services today.