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Aujourd’hui — 31 octobre 2024Flux principal

Arecibo Collapsed Because of Engineering Failures That Inspectors Failed To Spot

Par : BeauHD
31 octobre 2024 à 10:00
An anonymous reader quotes a report from Behind the Black: According to a new very detailed engineering analysis into the causes of the collapse of the Arecibo radio telescope in Puerto Rico in 2020, the failure was caused first by a surprising interaction between the radio electronics of Arecibo and the traditional methods used to anchor the cables, and second by a failure of inspections to spot the problem as it became obvious. The surprising engineering discovery is illustrated [here (PNG)]. The main antenna of Arecibo was suspended above the bowl below by three main cables. The figure shows the basic design of the system used to anchor the cable ends to their sockets. The end of the cable bunches would be inserted into the socket, spread apart, and then zinc would be poured in to fill the gap and then act as a plug and glue to hold the cables in place. According to the report, this system has been used for decades in many applications very successfully. What the report found however was at Arecibo over time the cable bunch and zinc plug slowly began to pull out of the socket, what the report labels as "zinc creep." This was noted by inspectors, but dismissed as a concern because they still believed the engineering margins were still high enough to prevent failure at this point. In fact, this is exactly where the structure failed in 2020, with the first cable separating as shown in August 2020. The second cable did so in a similar manner in November 2020. The report concluded that the "only hypothesis the committee could develop that provides a plausible but unprovable answer to all these questions and the observed socket failure pattern is that the socket zinc creep was unexpectedly accelerated in the Arecibo Telescope's uniquely powerful electromagnetic radiation environment. The Arecibo Telescope cables were suspended across the beam of 'the most powerful radio transmitter on Earth.'"

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FCC Chair: Mobile Dead Spots Will End When Space-Based and Ground Comms Merge

Par : msmash
29 octobre 2024 à 20:01
Federal Communications Commission Chair Jessica Rosenworcel outlined a vision for universal connectivity last week that merges satellite and ground-based networks. The FCC recently became the first regulator to establish a framework for supplemental coverage from space (SCS). "Satellites may be in our skies, but they are the anchor tenant in our communications future," said Rosenworcel, calling for seamless integration of fiber, cellular, wireless, and satellite infrastructure into a unified network. The vision comes as the FCC's Affordable Connectivity Program recently ended due to funding depletion.

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Boeing-Made Satellite Explodes In Space

Par : BeauHD
24 octobre 2024 à 07:00
"Boeing has had a series of issues over the past few years," writes Slashdot reader quonset. "From planes crashing, lost service records, to a recent strike which cost them $6 billion, now comes word a satellite they made has exploded in space." CBS News reports: The Intelsat 33e satellite, which was launched in 2016 and provides communications across Europe, Asia and Africa, experienced "an anomaly" on Saturday, Intelsat said in a news release. Attempts were made to work with Boeing and repair the satellite, but on Monday, the U.S. Space Force confirmed that the satellite had exploded. The satellite's breakup left some customers without power or communications services. Intelsat said it is working with third-party providers to limit service interruptions, and is in communication with customers. Since the breakup, the U.S. Space Force is now tracking "around 20 associated pieces" of the satellite in space. The agency said that there are "no immediate threats" and routine assessments to ensure safety are ongoing. Russia's space agency, Roscosmos, said it had recorded "more than 80 fragments" of the destroyed satellite. Analysis of the pieces' trajectory determined that the destruction of the satellite was "instantaneous and high-energy," Roscosmos said.

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SpaceX Requests Starlink Gen2 Modification, Previews Gigabit-Speeds

Par : BeauHD
17 octobre 2024 à 07:00
Longtime Slashdot reader schwit1 shares a report from Via Satellite: SpaceX submitted a request to the FCC to modify the second generation, Gen2, of its Starlink satellite system with changes that SpaceX said will allow the constellation to deliver gigabit-speed broadband. SpaceX submitted the filing to the FCC on Oct. 11, and it was made public on Tuesday. The operator wants to make changes to the orbital configuration and operational parameters, and requests modifications for its Gen2 frequency authorization. These modifications "will enable the Gen2 system to deliver gigabit-speed, truly low-latency broadband and ubiquitous mobile connectivity to all Americans and the billions of people globally who still lack access to adequate broadband," Jameson Dempsey, SpaceX director of Satellite Policy said in the filing. For comparison, Starlink's current statement on service speeds is that users typically experience download speeds between 25 and 220 Mbps, and a majority of users experience speeds over 100 Mbps. In 2022, the FCC partially approved SpaceX to deploy a Gen2 Starlink constellation of up to 7,500 satellites for fixed satellite services (FSS) in the Ku- and Ka-bands, then later authorized Gen2 operations using additional frequencies in the E- and V-bands. SpaceX reported that since then, it has deployed more than 3,000 satellites in the Gen2 system and the full Starlink constellation serves more than four million people.

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India Agrees With Musk in Satellite Spectrum Allocation Row

Par : msmash
15 octobre 2024 à 14:40
India announced on Tuesday it would allocate spectrum for satellite services through administrative means rather than auction, a decision that aligns with recent comments by Elon Musk and rebuffs lobbying efforts by the country's largest telecom operators. From a report: Jyotiraditya Scindia, India's Communications Minister, stated on Tuesday evening: "Spectrum for satcomm is shared spectrum, and cannot be auctioned. The administrative allocation of satellite spectrum is practised worldwide." This move favors Musk's Starlink and Amazon's Project Kuiper, who have advocated for shared spectrum allocation. It contradicts Reliance Jio's position, led by India's richest man Mukesh Ambani, which has pushed for auctions to ensure a "level playing field." Musk had warned on Monday that satellite spectrum auctions "would be unprecedented," citing long-standing ITU designations of shared satellite spectrum.

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FCC Lets Starlink Provide Service To Cellphones In Area Hit By Hurricane

Par : BeauHD
8 octobre 2024 à 00:02
An anonymous reader quotes a report from Ars Technica: The Federal Communications Commission gave Starlink and T-Mobile emergency authority to provide satellite-to-phone coverage in areas hit by Hurricane Helene. "SpaceX and T-Mobile have been given emergency special temporary authority by the FCC to enable Starlink satellites with direct-to-cell capability to provide coverage for cell phones in the affected areas of Hurricane Helene," SpaceX said yesterday. "The satellites have already been enabled and started broadcasting emergency alerts to cell phones on all networks in North Carolina. In addition, we may test basic texting (SMS) capabilities for most cell phones on the T-Mobile network in North Carolina." SpaceX warned of limits since the service isn't ready for a commercial rollout. "SpaceX's direct-to-cell constellation has not been fully deployed, so all services will be delivered on a best-effort basis," the company said. Starlink is being used to provide wireless emergency alerts to cell phones from all carriers in North Carolina, according to Ben Longmier, senior director of satellite engineering for SpaceX. "We are also closely monitoring Hurricane Milton and standing by ready to take action in Florida," he wrote. The FCC said (PDF) the approval "enabl[es] SpaceX to operate Supplemental Coverage from Space (SCS) in the 1910-1915 MHz and 1990-1995 MHz frequency bands leased from T-Mobile in areas affected by the Hurricane Helene." An FCC spokesperson told Ars that the approval is for all areas affected by Hurricane Helene, although it's only active in North Carolina so far. The FCC also said (PDF) that it is granting "special temporary authorities to licensees and issuing rule waivers to help communications providers maintain and restore service, support emergency operations, and assist public safety, including search and rescue efforts." Separately, the FCC last week waived (PDF) certain Lifeline program eligibility rules to help people in disaster areas (PDF) apply for discounted phone and broadband service.

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DirecTV To Buy Rival Dish Network

Par : msmash
30 septembre 2024 à 18:41
DirecTV has agreed to acquire struggling rival Dish Network, creating a satellite TV behemoth with nearly 20 million subscribers. The complex transaction, announced Monday, involves private equity firm TPG acquiring a majority stake in DirecTV from AT&T for $7.6 billion. DirecTV will then purchase Dish for $1 and assume its debt. The deal provides a lifeline for Dish, which faces $2 billion in debt due November with only $500 million in available cash. EchoStar, Dish's parent company, will retain its wireless spectrum investments and operate independently. Subject to regulatory approval and creditor agreement, the merger is expected to close in late 2025. DirecTV and TPG will provide $2.5 billion to cover Dish's immediate financial needs. The deal's fate remains uncertain, as a similar 2002 merger attempt was blocked on antitrust grounds.

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Starlink Surpasses 4 Million Subscribers

Par : BeauHD
28 septembre 2024 à 07:00
Longtime Slashdot reader penciling_in shares a report from CircleID: Starlink, SpaceX's satellite-based internet service, has hit a major milestone by surpassing 4 million subscribers worldwide. SpaceX confirmed the news on Thursday after company President Gwynne Shotwell hinted earlier in the week that the service would reach the mark within days. Since its beta launch in October 2020, Starlink has rapidly scaled, growing from 1 million subscribers by December 2022, to 2 million by September 2023, and now 4 million just months later. The service operates through a vast constellation of nearly 6,000 satellites, providing satellite internet to users in almost 100 countries, including expanding into previously underserved regions like Africa and the Pacific islands. [While competition from OneWeb and Amazon's Project Kuiper looms, Starlink remains the market leader. However, challenges like slowing U.S. growth and concerns over satellite interference with radio astronomy persist.] Starlink is coming to United Airlines' entire fleet and Hawaiian Airlines Airbus flights. Air France also announced yesterday that it, too, will support free Starlink Wi-Fi on all its aircraft.

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Starlink Is Now Available on All Hawaiian Airlines Airbus Flights

Par : BeauHD
27 septembre 2024 à 07:00
Hot on the heels of United Airlines' Starlink announcement, Hawaiian Airlines said it, too, is offering "fast and free Starlink Wi-Fi" across its entire Airbus fleet. CNET reports: Hawaiian Airlines is now the first major carrier to use Elon Musk's satellite internet service, which taps more than 7,000 satellites in low earth orbit to deliver high-speed internet worldwide. "In Starlink's low earth orbit constellation of advanced satellites, the latest of which utilize a revolutionary laser mesh network, we found an ideal solution to ensure reliable, high-speed, low-latency Wi-Fi on transpacific flights," a Hawaiian Airlines representative told CNET. "Working with Starlink has allowed us to offer a fast and consistent in-flight connectivity experience that meets our high standard for guest service." The company first debuted Starlink on its planes in February on a flight from Honolulu to Long Beach, California. It first struck a deal with Starlink in 2022 and has now completed installation across its entire Airbus fleet, which includes 24 A330 planes and 18 A321neos. Hawaiian Airlines will also deploy the service on its two Boeing 787-9 planes, but not its Boeing 717 aircraft, which are used on shorter flights between the Hawaiian Islands.

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Starlink Now Constitutes Roughly Two Thirds of All Active Satellites

Par : BeauHD
7 septembre 2024 à 12:30
"SpaceX deployed its 7,000th Starlink satellite this week, making the vast majority of active satellites around earth part of a single megaconstellation," writes Slashdot reader DogFoodBuss. "The Starlink communications system is now orders of magnitude larger than its nearest competitor, offering unprecedented access to low-latency broadband from anywhere on the planet." According to the latest data from satellite tracker CelesTrak, SpaceX now controls over 62% of all operational satellites. The Independent reports: The latest data from non-profit satellite tracker CelesTrak shows that SpaceX has 6,370 active Starlink satellites in low-Earth orbit, with several hundred more inactive or deorbited. The figure, which has risen more than six-fold in just three years, represents just over 62 per cent of all operational satellites, and is roughly 10-times the number of Starlink's closest rival, UK-based startup OneWeb. SpaceX plans to launch up to 42,000 satellites to complete the Starlink constellation, capable of delivering high-speed internet and phone connectivity to any corner of the globe. Starlink currently operates in 102 countries and has more than three million customers paying a monthly fee to access the network through a $300 ground-based dish. The company expects to launch its service in dozens more countries, with only Afghanistan, China, Iran, North Korea, Russia and Syria not on the current waitlist due to internet restrictions or trade embargos. "Starlink now constitutes roughly 2/3 of all active Earth satellites," SpaceX CEO Elon Musk said on X following the latest SpaceX launch.

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Ask Slashdot: What's the Best Home Videoconferencing System?

Par : EditorDavid
1 septembre 2024 à 21:43
renzema (Slashdot reader #84,617) wants suggestions for a point-to-point video conferencing system "to connect the kids to their grandparents... We live in Europe and they in the U.S., but we both have gigabit internet and can sustain upwards of 100mb between our houses." I've been spoiled at work with super high quality Cisco systems... Currently, we have Amazon Echos, but the video quality on these (at least for Sweden/U.S. calls) is really lacking. We've tried Facetime as well, and while the video quality is much better, the inconvenience of needing to use it on an iPad or phone is quite high (or starting a call with them, then them needing to move to the computer...) Ideally I would love Facetime on an Apple TV with a camera that follows us. We have played a bit with the phone-as-a-camera thing with Facetime and Apple TV, but the sound was not great... I'm willing to invest in hardware, up to a few hundred dollars per site, if this can really be bulletproof and give a consistently high quality video connection. Ideally it would be standalone hardware that does not need a computer to be running all the time. There's one problem that can't be solved: calling the grandparents' phone when they're out of the house and not available to talk. But the dream solution involves using a TV to make and receive video calls. "When a call is received, it would power on the TV and 'ring'." The wishlist? High quality pictureNo echo in large rooms. Handles people sitting a few meters away from the TV."Would really prefer no monthly fees." Any suggestions? Share your own thoughts and experience in the comments. What's the best home videoconferencing system?

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