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Free Space Optics

Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:10:42 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:10:42 AM
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O technology is implemented using a laser device .These laser devices or terminals can be mounted on rooftops ,Corners of buidings or even inside offices behind windows. FSOdevices look like security video cameras.

Low-power infrared beams, which do not harm the eyes, are the means by which free-space optics technology transmits data through the air between transceivers, or link heads, mounted on rooftops or behind windows. It works over distances of several hundred meters to a few kilometers, depending upon atmospheric conditions.
Commercially available free-space optics equipment provide..................[:=> Show Contents <=:]

MEMS in space

Posted by: computer science crazy
Created at: Monday 23rd of February 2009 12:49:15 PM
Last Edited Or Replied at :Friday 14th of January 2011 09:02:58 AM
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higher than many other engineering materi..................[:=> Show Contents <=:]

Lightning Protection Using LFA-M

Posted by: computer science crazy
Created at: Sunday 15th of February 2009 12:36:04 AM
Last Edited Or Replied at :Thursday 01st of March 2012 11:49:33 PM
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LFA-M. It offers great number of technical and economical advantages. The important feature of this modular long flashover arrester (LFA-M) is that it can be applied for lightning protection of overhead distribution line against both induced overvoltages and direct lightning strokes.

The induced over voltages can be counteracted by installing a single arrester on an overhead line support (pole). For the protection of lines against direct lightning strokes, the arresters are connected between the poles and all of the phase conductors in parallel with the insulators. A long flashover arrest..................[:=> Show Contents <=:]

Optical Free Space Communication

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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Therefore are the required devices similar to those used with fibers.

The advantages of such a system are the following:
_ No need for digging up the roads
_ No radio frequency licenses are required
_ Bandwidth is equal or superior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and t..................[:=> Show Contents <=:]


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:13:47 PM
Last Edited Or Replied at :Thursday 01st of April 2010 04:15:58 AM
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n technique that divides the communication channel into a number of equally spaced frequency bands. A sub carriers a portion of the users information in each band. Each sub carriers is orthogonal (Independent of each other) with every other sub carrier. OFDM efficiently squeezes multiple modulated carriers tightly together reducing the required bandwidth.OFDM was invested in 1960?s, only recently it has recognized as an excellent method for bi-directional wireless data communication. It is extremely efficient in mitigating common problems in high-speed communication such as multipath fading an..................[:=> Show Contents <=:]

Direct to home television DTH

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:26:57 AM
Last Edited Or Replied at :Monday 01st of August 2011 11:18:36 PM
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werful antenna to transmit radio waves to the surrounding area. Viewer's can pickup the signal with a much smaller antenna. The main limitation of broadcast television is range. The radio signal used to broadcast television shoot out from the broadcast antenna in a straight line. Inorder to receive these signals, you have to be in the direct line of sight of the antenna. Small obstacles like trees or small buildings aren't a problem; but a big obstacle, such as Earth, will reflect these waves. If the Earth were perfectly flat, you could pickup broadcast television thousands of miles from the..................[:=> Show Contents <=:]

Free Space Optics

Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:03:26 AM
Last Edited Or Replied at :Friday 24th of February 2012 11:24:18 PM
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rability to weather interferences were the major drawbacks at that time. The optical communication without wire, however, evolved! Today, FSO systems guarantee 2.5 Gb/s taxes with carrier class availability. Metropolitan, access and LAN networks are reaping the benefits.

The use of free space optics is particularly interesting when we perceive that the majority of customers does not possess access to fibers as well as fiber installation is expensive and demands long time. Moreover, right-of-way costs, difficulties in obataining government licenses for new fiber installation etc. are furthe..................[:=> Show Contents <=:]

Lightning Protection Using LFA-M

Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:39:22 PM
Last Edited Or Replied at :Sunday 17th of October 2010 11:56:38 PM
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of stroke A between the clouds. There are three clouds P,Q and R having positive, negative and positive charge respectively. Charge on the cloud Q is bound by cloud R.I..................[:=> Show Contents <=:]

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