TRENDnet USB 3.0 Keyfob supporting IEEE 802.11ac. Free Technical Library News

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TRENDnet USB 3.0 Keyfob with IEEE 802.11ac Support

29.04.2013

TRENDnet has announced the availability of the TEW-805UB Wireless Network Card in USB key fob format. According to the manufacturer, this is the first device of its kind in the industry to support the latest IEEE 802.11ac wireless standard and high-speed USB 3.0 interface.

The novelty was announced in early January at CES 2013, but only now the product is ready to enter the market. The device supports data transmission in a wireless network at speeds up to 867 Mbps. Also supports the IEEE 802.11n specification with a bandwidth of 300 Mbps. The dimensions of the USB key fob are 80 x 27 x 12 mm, weight - 20 grams.

The device is available in the US for $60.

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SPRESSO (Echelle Spectrograph for Rocky Exoplanet and Stable Spectroscopic Observations) started its work today - the search for rocky exoplanets and stable spectroscopic observations. It has improved spectral resolution, a wider wavelength range, and is mounted on ESO's Very Large Telescope (VLT) in Chile. Scientists hope to use it to detect fainter traces of planets with masses and Earth-like orbits. This was announced in a press release by the European Southern Observatory (ESO).

It works by measuring shifts in the spectrum of light from stars caused by planetary gravity.

"It's the most advanced object of its kind in the world," said astronomer Didier Queloz of the University of Cambridge, one of those who, in 1995, discovered the first exoplanet orbiting a normal star.

In the early years of exoplanet research, the "radial velocity" method was most often used, because the light from dim planets is too weak to be seen against the glow of their stars. Since an exoplanet revolves around a star, from the point of view of an observer on Earth, as if pulling its star back and forth, the periodic change in the speed of the star is detected as a Doppler shift in the frequency of its glow.

Hundreds of exoplanets have been found this way. But in recent years, this method has given way to the transit method - the detection of a planet when it passes in front of its star and it temporarily dims. Since 2009, NASA's Kepler satellite has detected several thousand exoplanets using this method.

These two methods show different characteristics of the exoplanet. More precisely, both help determine the orbit, but the old one gives information about the mass of the planet, and the transit one about its size.

This has led to the creation of a new generation of spectrographs designed to search for exoplanets, using different methods and covering different wavelength ranges. The previous generation of spectrographs can record fluctuations of about 1 meter per second - for example, Jupiter "shifts" the Sun by 13 meters per second, but the much weaker Earth in this respect only by 9 centimeters per second. ESPRESSO, the latest development in this direction, should be able to capture planets like Earth with a sensitivity of up to 10 centimeters per second or even less. As Francesco Pepe of the University of Geneva in Switzerland said, "We were the first to go crazy enough to make it happen."

An exact analogue of the Earth is probably out of reach yet, but ESPRESSO should be able to detect super-Earths, three to four Earths in mass, that surround Sun-like stars. It can also detect Earth-sized planets around smaller stars.

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