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Who Were the First.

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Current issue

ELEKTRO 7/2018 was released on June 27th 2018. Its digital version will be available on July 27th 2018.

Topic: Cables, conductors and cable engineering; Tools, equipment and accessories for work with cables

Main Article
Parametrization of circuit models of Li-accumulators for electromobility
Smart Cities (part 3 – volume 1)

SVĚTLO (Light) 4/2018 was released on July 30th 2018. Its digital version will be available on August 31th 2018.

Refreshing our memory
Eccentric luminaires of René Roubíček from the years1965 till 1977
Bases of photometry – 1st part
Great personage of Czech science of times after Battle at Bílá hora: doctor, naturalist, philosopher and physicist Jan Marek Marci from Kronland

Optical radiation effects and use
The light and circadian rhythms

The details behind SpaceX’s ambitious satellite internet experiment

26.07.2016 | Quartz | www.qz.com

New details have emerged about SpaceX’s ambitious plans to launch a huge constellation of micro-satellites designed to provide internet service here on Earth.

The company wants to start with two identical microsats, launched on its flagship Falcon 9 rocket. The satellites will communicate on high-frequency Ku-satellite spectrum to reach three ground stations on the west coast of the US—SpaceX operations in Los Angeles and Redmond, Washington, and at Tesla Motors (Musk’s other company) in Fremont, California—in order to test the broadband antennas built into the satellites.

SpaceX's new plan for internet satellites

The satellites will orbit at an altitude of 650 kilometers, about 150 km closer to Earth than most other communications satellites, which is one way that SpaceX hopes to reduce the lag between data transmission and reception. The company forecasts spending about 10 minutes of every day conducting test link-ups with the satellites, which can transmit both video and telemetry data.

The primary reason for the filing with the FCC is to assure the government that these tests will not interfere with other communications broadcasts. Such licenses are typically approved or denied within six weeks.

Read more at Quartz

Image Credit: AP Photo/Ringo H.W. Chiu

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