satellite cable/ satellite dish

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What is a satellite dish: is a combination of one antenna or dish antenna to recevie communcation or singal from orbiting dishes in outer space. Or a low noise amplifier used at a focal point to ampliy frequencies.

Satllite dish television was was invented by NASA, not intellionaly for television but for the space program. As time and more money went in to the program NASA was able to perfect the method of sending singals back to earth. Which decreased the noise and visablity or the picture.

As time went on satellite compnies where able to place their own orbiting satellite for transmission called Direct broadcast satellites. Direct broadcast satellite are normally located in the upper k_band. However there are many other frequency such as C_band, Ka_band and Ku_band.

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The frequencies discussed in the previous context are part of the eletromagnetic field in the micowave range of frequencies of 10.9 through 12.75 Ghz. Most and satellite companies primarily use the Ku band for their satellite communication.

   Direct broadcasting singals are located in the upper ku band ranging from 12.. through 12.75 GHz

   The ka band is rouhgly used to refer the recommed operating frequencies of WR-28  rectangular wavelenght which is 26.5 to 40.0 Ghz

Thre are over 30 c bands that us liner polarzation or circular polarzation. C band down links range from 3.7 - 4.2 ghz, while the the uplink 5.9 to 6.4 Ghz

   L band the L band is also part of the electromagnetic field ranging from .39 through 1.55 Ghz the singal is mostly used from radio however, some satellite companies use the singal for reception. The L band is held by the military thought causing most radio satellite providers to us in-band on channel. The global positioning carries of the band are located 1176.45 MHz (L5), 1227.60 MHz (L2), 1381.05 MHz (L3), and 1575.42 MHz (L1) frequencies.

The X band ranges from 8.0 through 12.0 Ghz the x band is used by some satellite companies just like the l band but is primarily for x band rader. The 4cm rader spot band ranges from 5.2 to 10.9 ghz

The last band that i will discuss will be the v the the band ranges from 50 to through 75Ghz, the band is mostly used in sciencetific research scuh as sonar technology.