Get the Message: Telecommunications in Your High-tech WorldBradbury Press, 1993 - 64 Seiten What happens when someone picks up a telephone, dials a number, and hears the ring at the other end? Expanding a young person's awareness of the way technology works in daily life, the author focuses on calls two teenagers make about an upcoming dance to explain communications technology. Features full-color photos and computer-generated graphics. |
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... watts . By contrast , a lo FM radio station may transmit at a power ranging from 26,0 watts to 100,000 watts . A cellular - system service territory has a lot of.
... watts . By contrast , a lo FM radio station may transmit at a power ranging from 26,0 watts to 100,000 watts . A cellular - system service territory has a lot of.
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... watts of microwave power cook your food . These towers use only twenty watts to transmit microwave signals over a distance of thirty miles . The distance between cycles of a s frequency stays the. AT & T Bell Labs nds of flexible glass ...
... watts of microwave power cook your food . These towers use only twenty watts to transmit microwave signals over a distance of thirty miles . The distance between cycles of a s frequency stays the. AT & T Bell Labs nds of flexible glass ...
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... watts . At the end of the first 30 - mile stretch , the carrier gnal has lost most of its strength , just the way the horses once d . All that's left is about a millionth of a watt . By then , the weakened signal has reached the next ...
... watts . At the end of the first 30 - mile stretch , the carrier gnal has lost most of its strength , just the way the horses once d . All that's left is about a millionth of a watt . By then , the weakened signal has reached the next ...
Häufige Begriffe und Wortgruppen
Airfone analog Andrea antenna Ariane rockets AT&T Bell Labs Author photo bandwidth binary code Brian hears Brian's voice button carbon chamber carry cell CELL SITE cellular phones central switching office Cerritos COLLNOT color fax machine communications satellite conversation copper wires cordless phone cycles per second dial diaphragm digital signals Earth electric current electrical signals electromagnetic waves electronic fiber optics fiber-optic cable frequency geostationary gigahertz glass fibers Gloria Skurzynski grandmother GTE Spacenet guitar string handset hertz High-Tech World hookup hundred Intelsat kilohertz Kristin says Kristin tells Kristin's house Kristin's mother laser light lightwave megahertz miles million mobile switching office NASA optical fiber orbit pager pair of copper pay phone pulses pushes radio signals radio waves receiver relay screen signals travel sound waves space talking to Kristin telecommunications telephone calls television Telstar thin three satellites tone transmission transmit traveling wave tube vibrates VideoPhone 2500 watts