31 Years of the Digest ... founded August 21, 1981
The Telecom Digest for February 9, 2013
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Date: Thu, 7 Feb 2013 21:00:34 -0800 (PST) From: Neal McLain <email@example.com> To: firstname.lastname@example.org. Subject: Re: Closer than the satellites that guide your GPS Message-ID: <email@example.com> On Feb 7, 6:18 pm, Neal McLain <nmcl...@annsgarden.com> wrote: > Most communication satellites are indeed in geosynchronous orbits. > Furthermore, most of them are in the geostationary orbit; i.e., the > Clarke Belt. > > The term "geosynchronous" means only that the satellite orbit equals one > sidereal day. It says nothing about the inclination of the orbital > plane or the eccentricity of the orbit. To be geostationary, an orbit > must meet three criteria: > > - It must be geosynchronous. > > - The inclination of the orbital plane must be zero (i.e., it must lie > in the earth's equatorial plane). > > - The eccentricity of the orbit must be zero (i.e., the orbit must be a > circle). > > There's an infinite number of geosynchronous orbits but only one of them > is geostationary. [Moderator snip] > > ***** Moderator's Note ***** > > What's the third criteria? Criteria: 1. The orbit must be geosynchronous. 2. The inclination of the orbital plane must be zero (i.e., it must lie in the earth's equatorial plane). 3. The eccentricity of the orbit must be zero (i.e., the orbit must be a circle). Neal
Date: Fri, 8 Feb 2013 00:03:40 -0500 From: Bill Horne <bill@horneQRM.net> To: firstname.lastname@example.org. Subject: CenturyLink looses a cable in Mesa AZ Message-ID: <20130208050340.GA2589@telecom.csail.mit.edu> Century Link line damaged in Mesa While working on the Mesa Drive and Southern Avenue improvements project, a contractor damaged a Century Link telephone line Thursday afternoon. In a statement released shortly after the incident, Century Link said that approximately 2,000 homes and businesses have been affected. http://ktar.com/22/1608610/Century-Link-line-damaged-in-Mesa -- Bill Horne (Remove QRM from my address to write to me directly)
Date: Fri, 8 Feb 2013 06:19:33 +0000 (UTC) From: David Lesher <email@example.com> To: firstname.lastname@example.org. Subject: Re: closer than the satellites that guide your GPS Message-ID: <email@example.com> "John Levine" <firstname.lastname@example.org> writes: >>More likely, they assumed GPS satellites were in geosynchronous orbits >>(22,000 miles), like most communication satellites. I was actually >>surprised to see that they aren't. >Then they wouldn't be usable at high latitudes, which would be a >problem. (Remember where the DEW line was.) Err, would not a higher altitude make for better polar coverage? GPS birds are lower because their transmissions are weak, and have to be heard by substandard receivers/antennas. -- A host is a host from coast to coast.................email@example.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Date: Fri, 08 Feb 2013 09:10:39 -0600 From: firstname.lastname@example.org (Robert Bonomi) To: email@example.com. Subject: Re: closer than the satellites that guide your GPS Message-ID: <tsWdnQWTq_byiIjMnZ2dnUVZ_qednZ2d@posted.nuvoxcommunications> In article <firstname.lastname@example.org>, David Lesher <email@example.com> wrote: >"John Levine" <firstname.lastname@example.org> writes: > >>>More likely, they assumed GPS satellites were in geosynchronous orbits >>>(22,000 miles), like most communication satellites. I was actually >>>surprised to see that they aren't. > >>Then they wouldn't be usable at high latitudes, which would be a >>problem. (Remember where the DEW line was.) > >Err, would not a higher altitude make for better polar coverage? If they were in equatorial orbits, yes, higher is better. They're not. >GPS birds are lower because their transmissions are weak, and have >to be heard by substandard receivers/antennas. Insignificant (about 4dB, vs geosync), inconsequential, and irrelevant. <grin> GPS, and other forms of 'triangulation', is more precise when the angular difference between stations is larger. Having the line of sight well above the horizon is preferable. (geostationary is actually below the horizon at the Poles, at ground level) Non-geosync orbits ensure a bird is not permanently blocked by a stationary ground-based obstacle. 'High in the sky' is less likely to be blocked temporarily by a stationary obstacle. Solving 'all of the above' for 'everywhere on Earth, all the time' is non trivial. <wry grin> GPS birds have to be in stable/predictable orbits, you can't maneuver them at will. The vast majority of 'space junk' is in LEO. A good reason to avoid that region for long-life birds. Orbital velocity is lower in higher orbits, reducing Doppler-shift effects. Selecting the orbits (height, azimuth, inclination, eccentricity) for the GPS constellation was a complex set of trade-offs. <grin>
Date: 8 Feb 2013 22:36:20 -0000 From: "John Levine" <email@example.com> To: firstname.lastname@example.org. Subject: Re: closer than the satellites that guide your GPS Message-ID: <email@example.com> >Err, would not a higher altitude make for better polar coverage? Not if they're over the equator. Even if they were infinitely far away, at the pole your antenna would still be horizontal, and any feature higher than you would block it. >GPS birds are lower because their transmissions are weak, and have >to be heard by substandard receivers/antennas. They're not that much lower. Iridium satellites really are in low orbit for that reason, but GPS is higher than LEO, but not as high as geosync. R's, John
Date: Fri, 08 Feb 2013 07:59:39 -0800 From: Jon Danniken <jonSPAMdanniken@yaSMPAhoo.com> To: firstname.lastname@example.org. Subject: Re: closer than the satellites that guide your GPS Message-ID: <email@example.com> On 02/06/2013 10:29 AM, Bill Horne wrote: > > The fact that investorplace.com echoed CBS' error only bolsters my > argument: I don't know which cart got in front of which horse, but a > national news organization is responsible for paying attention to the > basics. You would think that they would be able to run the story by someone in their employ who was scientifically minded, who might actually know the answer, or at least would be curious enough to check it. Perhaps a meteorologist would fit that bill, or just a plain old science consultant. Or maybe they did run the story by such a person, and that person got it wrong. Jon
Date: Fri, 8 Feb 2013 20:00:07 -0500 From: Monty Solomon <firstname.lastname@example.org> To: email@example.com. Subject: An imperfect ten: the BlackBerry Z10 smartphone review Message-ID: <firstname.lastname@example.org> An imperfect ten: the BlackBerry Z10 smartphone review The Z10 is good, just maybe not break-up-with-your-current-smartphone good. by Andrew Cunningham Feb 2 2013 Ars Technica http://arstechnica.com/gadgets/2013/02/an-imperfect-ten-the-blackberry-z10-smartphone-review/
Date: Fri, 8 Feb 2013 20:00:07 -0500 From: Monty Solomon <email@example.com> To: firstname.lastname@example.org. Subject: 23Mbps down, 44 up: A tech insider's view from the Super Bowl Message-ID: <email@example.com> 23Mbps down, 44 up: A tech insider's view from the Super Bowl Even during the power outage, Wi-Fi stayed strong-but a landline saved the day. by Jon Brodkin Feb 6 2013 Ars Technica When the lights went off at the Super Bowl during the big game's infamous power outage, not everything went offline. The stadium-wide Wi-Fi network kept working-or at least it did in some areas and for part of the outage. But it was a very old-school technology-a landline phone-that saved the day for Andrew Stern, a broadcast engineer for a San Francisco radio station. After coming home from New Orleans, Stern gave me a rundown on how the Super Bowl's technology held up. Was the Wi-Fi network as good as promised? Answer: yes. Did the 35-minute power outage cause problems? Answer: yes-but Stern and team found a way to manage. ... http://arstechnica.com/information-technology/2013/02/23mbps-down-44-up-a-tech-insiders-view-from-the-super-bowl/ -or- http://goo.gl/VaDzK
Date: Fri, 8 Feb 2013 20:00:07 -0500 From: Monty Solomon <firstname.lastname@example.org> To: email@example.com. Subject: Wi-Fi "as free as air"-the totally false story that refuses to die Message-ID: <firstname.lastname@example.org> Wi-Fi "as free as air"-the totally false story that refuses to die Journalism goes wrong and just keeps getting worse. by Jon Brodkin Feb 7 2013 Ars Technica Yesterday, a representative from Current TV's Viewpoint show contacted some people at Condé Nast, the owner of Ars Technica. Current TV was preparing a story about "the FCC's proposal to create free Internet access with the creation of 'super Wi-Fi' networks across the country," this person said, and the show needed a tech journalist to talk about it on the air. Uh-oh. If you read Ars or follow wireless tech, you already know what goes wrong in this anecdote. Yes, this week saw a story become a national sensation-free Wi-Fi for everyone! A virtual Oprah Winfrey would descend from on high and bestow free Internet connections onto us all, eliminating the need for pricey home Internet service and cell phone bills forever. The frenzy began Monday morning when the Washington Post reported that "the federal government wants to create super Wi-Fi networks across the nation, so powerful and broad in reach that consumers could use them to make calls or surf the Internet without paying a cellphone bill every month." Best of all, network access would be free. "If all goes as planned, free access to the Web would be available in just about every metropolitan area and in many rural areas," the Post reported. The clear implication: this was a bold-and entirely brand-new-plan. Unfortunately, the piece was basically nonsense. What had really happened was in fact unbelievably boring: the Post simply observed an incremental development in a Notice of Proposed Rulemaking (NPRM) at the Federal Communications Commission over the issue of incentive auctions that might free up some additional unlicensed spectrum for so-called "White Space Devices" (read our explainer) operating in and around the current over-the-air TV bands. (I told you it was boring; in addition, the basic debate over White Space Devices was actually settled in 2008.) >From this thin material, which basically consisted of Internet service providers and tech companies sniping at each other in long legal documents, with no decisions being made by anyone and no new proposals of anything, the Post then reported-on the front page, above the fold of the country's eighth-most highly circulated newspaper-that the FCC plan could lead to free Internet for most US residents. ... http://arstechnica.com/tech-policy/2013/02/wi-fi-as-free-as-air-the-totally-false-story-that-refuses-to-die/ -or- http://goo.gl/VJClN
Date: Fri, 8 Feb 2013 20:00:07 -0500 From: Monty Solomon <email@example.com> To: firstname.lastname@example.org. Subject: We're going to blow up your boiler: Critical bug threatens hospital systems Message-ID: <email@example.com> We're going to blow up your boiler: Critical bug threatens hospital systems 21,000 vulnerable systems found on the Internet, used by hospitals, banks, others. by Dan Goodin Feb 7 2013 Ars Technica More than 21,000 Internet-connected devices sold by Honeywell are vulnerable to a hack that allows attackers to remotely seize control of building heating systems, elevators, and other industrial equipment and in some cases, causes them to malfunction. ... http://arstechnica.com/security/2013/02/were-going-to-blow-up-your-boiler-critical-bug-threatens-hospital-systems/ -or- http://goo.gl/WTQu9
Date: Fri, 08 Feb 2013 20:38:37 -0500 From: bernieS <firstname.lastname@example.org> To: email@example.com. Subject: AT&T's SynJ extendable range phone system Message-ID: <I4NSi.A.edC.jiaFRB@telecom> Can any list members who have any experience (good or bad) with AT&T's SynJ extendable range phone system please email me privately? It's a 4-line DECT 6.0 cordless phone system for POTS that supports multiple radio repeaters, cordless desk sets, and cordless handsets. Thanks in advance! -bernieS ***** Moderator's Note ***** I will not publish replies: please send them directly to Beries. Bill Horne Moderator
Date: Fri, 8 Feb 2013 20:00:07 -0500 From: Monty Solomon <firstname.lastname@example.org> To: email@example.com. Subject: Site plagiarizes blog posts, then files DMCA takedown on originals Message-ID: <firstname.lastname@example.org> Site plagiarizes blog posts, then files DMCA takedown on originals Stories about a disgraced researcher get pulled by WordPress. by John Timmer Feb 5 2013 Ars Technica A dizzying story that involves falsified medical research, plagiarism, and legal threats came to light via a DMCA takedown notice today. Retraction Watch, a site that followed (among many other issues) the implosion of a Duke cancer researcher's career, found many of its articles on the topic pulled by WordPress, its host. The reason? A small site based in India apparently copied all of the posts, claimed them as their own, and then filed a DMCA takedown notice to get the originals pulled from their source. As of now, the originals are still missing as their actual owners seek to have them restored. ... http://arstechnica.com/science/2013/02/site-plagiarizes-blog-posts-then-files-dmca-takedown-on-originals/ -or- http://goo.gl/2SxPE
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