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Microwaves And Satellite Communication by Tymon Hytem-5496

Micro is a unit for measurement of length. As the name suggests microwaves are the portion of the electromagnetic spectrum where the wavelength falls between about one millimeter and thirty centimeters that is micrometers. Frequency of microwave bands extends from about one gigahertz to three hundred gigahertz and is useful for short range, high reliability radio and television links. Systems which use microwave frequencies are radar, mobile radio, satellite communications, terrestrial line of sight and troposphere links.

An essential property of microwaves is that they travel in straight lines through the atmosphere, are not affected by the ionized layers. Also these waves are very less affected by temperature inversions and scattering. But these weather effects limit the distance between the transmitter and the receiver to a few miles. This problem is over come by usage of repeater stations placed along the propagation path that extend the distance over which communication can occur. Basically a microwave repeater is a receiver/amplifier/transmitter combination used for relaying microwave signals in long distance and overland communication links. As frequencies of the signals increase thereby distance between repeaters decrease.

Main mode of propagation in the microwave range is line of sight. Line of sight means that the transmitter and receiver need to see each other. Thus range of line of sight communication depends upon the height of the communicating antennas and the nature of the terrain between them. Radio horizon limits the distance over which signals can be sent. Microwave repeaters i.e. radio link systems carry large quantizes of voice and data traffic and are subject to transmission impairments thus limiting the distance between relay points. Majority of the radio link systems carry analog signals which are frequency modulated, while a few carry digital signals. Radio link systems which are terrestrial are highly directional and send point to point voice and data signals.

Like television broadcast systems, satellite radio link systems also offer multiple path transmission for various signals. Waveguides are main transmission media for transmission of frequencies in the microwave spectrum. The walls of waveguides are highly polished and sometimes specially plated to reduce resistance and consequently power losses. These devices are constructed of brass, copper or aluminum and are made in sections of various lengths. The sections are straight, bent, twisted or flexible. The most common form of waveguide is rectangular in cross section although round waveguides may be used.

Microwaves can be transmitted by co axial cable, micro strip, strip line and optical fibers as well within certain range. Among these transmission of light modulated signals through optical fibers is the model method. As the waveguides provide excellent shielding and low loss so they can transmit greater amounts of power with less energy loss than co axial cables.

Tymon Hytem has worked in the electronics field for the past 15 years. He enjoys helping people decide on electronic gadgets from telephones to XM Radio and choosing the perfect XM Satellite Radio system for their needs.

Article Source: http://www.earticlesonline.com/Article/Microwaves-And-Satellite-Communication/244936

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Electrolux EI30MH55G Over the Range Microwave $699 Electrolux EI30MH55G Over the Range Microwave

LG Over the Range Microwave - White $449.99 LG Over the Range Microwave - White ,

GE 1.7 cu. ft. Over the Range Microwave $399.99 GE 1.7 cu. ft. Over the Range Microwave,

LG 1.6 cu. ft. Over the Range Microwave $499.99 LG 1.6 cu. ft. Over the Range Microwave,

Panasonic® 2.0 cu. Ft. Over the Range Microwave $699.99 Panasonic® 2.0 cu. Ft. Over the Range Microwave, GENIUS SENSOR COOKING ALLOWS YOU TO COOK FOOD AUTOMATICALLY AND GET PERFECT RESULTS EVERY TIME

LG 1.6 cu. ft. Over The Range Microwave $349.99 LG 1.6 cu. ft. Over The Range Microwave, Behind the stylish exterior of this microwave oven lies a high-performance cooking machine. LG’s powerful vented airflow system makes microwave cooking more pleasant by reducing food odours.

LG Over The Range Microwave LMV1680BB $222.99 Type: Over the Range Capacity: 1.6 cu.ft. Power Levels: 10 Turntable: Yes Turntable Diameter: 12.7" Power Requirements: 120V, 60Hz Racks: Bi-Level Cooking Rack Other Specifications: :::Cooking Features Auto and Rapid Defrost Reheat: Auto Reheat Add 30 Seconds More/Less Hold/Warm Melt/ Soften :::Convenience Features Turntable On/Off with Dual Distribution Technology Clock Kitchen Timer Cooking Complete Reminder :::Venting System Filtration: Carbon Coated Charcoal Filter Speed (Step): 2 Vent Grill Type: Hidden Vent Vent Air Flow: 300 CFM

LG Over The Range Microwave LMV1680WW $229.99 Type: Over the Range Capacity: 1.6 cu.ft. Power Levels: 10 Turntable: Yes Turntable Diameter: 12.8" Power Requirements: 120V, 60Hz Racks: Bi-Level Cooking Rack Other Specifications: :::Cooking Features Auto and Rapid Defrost Reheat: Auto Reheat Add 30 Seconds More/Less Hold/Warm Melt/ Soften :::Convenience Features Turntable On/Off with Dual Distribution Technology Clock Kitchen Timer Cooking Complete Reminder :::Venting System Filtration: Carbon Coated Charcoal Filter Speed (Step): 2 Vent Grill Type: Hidden Vent Vent Air Flow: 300 CFM

LG Over The Range Microwave LMV1680ST $255.99 Type: Over the Range Capacity: 1.6 cu.ft. Power Levels: 10 Turntable: Yes Turntable Diameter: 12.7" Power Requirements: 120V, 60Hz Racks: Bi-Level Cooking Rack Other Specifications: :::Cooking Features Auto and Rapid Defrost Reheat: Auto Reheat Add 30 Seconds More/Less Hold/Warm Melt/ Soften :::Convenience Features Bi-Level Cooking Rack Turntable On/Off with Dual Distribution Technology Clock Kitchen Timer Cooking Complete Reminder :::Venting System Filtration: Carbon Coated Charcoal Filter Speed (Step): 2 Vent Grill Type: Hidden Vent Vent Air Flow: 300 CFM

1.7 Cu.Ft. Convection Over-The-Range Microwave Oven $999.99 1.7 Cu.Ft. Convection Over-The-Range Microwave Oven, Auto Recipe™ ConversionJust set the controls according to the recipe and the oven automatically converts standard recipe temperatures to proper convection settings

Frigidaire® 1.7 cu. ft. Over The Range Microwave - White $449.99 Frigidaire® 1.7 cu. ft. Over The Range Microwave - White,

Frigidaire® 1.7 cu. ft. Over The Range Microwave - Black $449.99 Frigidaire® 1.7 cu. ft. Over The Range Microwave - Black,

Frigidaire® 1.7 cu. ft. Over The Range Microwave - Stainless Steel $499.99 Frigidaire® 1.7 cu. ft. Over The Range Microwave - Stainless Steel,

Frigidaire® 1.8 cu. ft. Over The Range Microwave - Stainless Steel $599.99 Frigidaire® 1.8 cu. ft. Over The Range Microwave - Stainless Steel,

LG LMV1813SB Over-the-Range Microwave (Refurbished) $451.1 LG has created the Quiet Power vent which keeps your range free of smoke quietly, without interrupting your life. This over-the-range microwave will help you cook the perfect meal every time and match your design sensibilities.Brand: LGModel: LMV1813SBWattage: 1100 wattsMaterial: Electrical componentsCubic foot: 1.8 feetOverall dimensions: 16.75 inches high x 29.86 inches wide x 15.36 inches deepSettings: Sensor cook options, power levels, auto and rapid defrost, popcorn key

LG 20 Cu Ft Over-the-Range Microwave - Stainless Steel $399.99 This over-the-range microwave features humidity-sensing technology to prevent over- and under-cooked food and an Extenda vent for efficient ventilation in your kitchen.

LG Over-the-Range Warming Lamp Microwave (Refurbished) $532.17 Featuring much better ventilation, this microwave is more efficient and emits fewer odors. This microwave doesnt just heat food, it also keeps food warm and ready to serve up to 90 minutes.Warming LampQuietPower Sensor cooking 2.0 cu feetThis high-quality item has been factory refurbished. Please click on the icon above for more information on quality factory-reconditioned merchandise.

SHARP RK240 Over the Range Microwave Charcoal Filter $19.99 Type: Filters Features: Helps control strong odors Not a grease filter Not washable or reusable Necessary for non-ducted installations of Sharp over the range microwaves models R1500, R1501, R1502, R1505, R1506, R1510, R1511, and R1514. Parts: 1 year limited Labor: 1 year limited

LG 1.8 cu. ft. Over The Range Microwave with QuietPower™ $599.99 LG 1.8 cu. ft. Over The Range Microwave with QuietPower™, Free up some extra space in your kitchen. This over the range microwave comes with LG’s own ventilation system for quieter operation. If you didn’t use it so much, you might not even notice it’s there.

GE Spacemaker 15 Cu Ft Over-the-Range Microwave - Black $209.99 This over-the-range microwave features a recirculating vent fan with a charcoal filter to keep the air in your kitchen free of unwanted cooking aromas. The CircuWave cooking system is packed with features to make it easy to prepare a wide range of foods.

GE Spacemaker 15 Cu Ft Over-the-Range Microwave - White $209.99 This over-the-range microwave features a recirculating vent fan with a grease filter to keep the air in your kitchen free of unwanted cooking aromas. The CircuWave cooking system is packed with features to make it easy to prepare a wide range of foods.

Whirlpool 17 Cu Ft Over-the-Range Microwave - Black $199.99 Cook a variety of food with this Whirlpool WMH31017AB over-the-range microwave that features a 1.7 cu. ft. interior capacity to prepare a wide range of dishes. The 2-speed fan and hidden vent help promote a cleanly kitchen.

LG 2.0 cu. ft. Over The Range Microwave with QuietPower™ $749.99 LG 2.0 cu. ft. Over The Range Microwave with QuietPower™, What does better ventilation mean anyways It means a better and more efficient microwave that emits fewer odours. This microwave doesn’t just heat food, it also keeps food warm and ready to serve for up to 90 minutes.

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