HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
Page 1/2  >  >>
Elizabeth M
User Rank
Blogger
Re: skeptically optimistic
Elizabeth M   4/24/2014 5:48:57 AM
NO RATINGS
Yes, I agree, Debera. WiFi is essential. I just was with a friend who is living in a house quite outside the center of her town and couldn't find an Internet provider for six months. She just received her WiFi service when I was visiting and it was like Christmas morning for her; she was so excited. So I think WiFi should be ubiquitous.

Debera Harward
User Rank
Silver
Re: skeptically optimistic
Debera Harward   4/22/2014 6:04:08 AM
NO RATINGS
Elizebeth, I totally agree with you that sometimes you need a break from all these technologies especially internet and smart fones to give our minds rest but then we cant argue on the fact that WIFI is now not the luxury but it is the necessity of life . We should have acces to wifi and i really liked the idea however by not using it we can give ourselves the break .

Elizabeth M
User Rank
Blogger
Re: Pump and dump scheme
Elizabeth M   2/27/2014 5:48:23 AM
NO RATINGS
Your point is succinctly put, vandamme, and I suspect the same, even though it sounds like a good idea!

Elizabeth M
User Rank
Blogger
Re: skeptically optimistic
Elizabeth M   2/27/2014 5:47:32 AM
NO RATINGS
Yes, Davek3gau, I know I have options to tune things out if I want to. It's just so tempting sometimes to be always on, if you know what I mean. I do probably need to use that off switch a lot more often than I do! Thanks for the reminder.

vandamme
User Rank
Silver
Pump and dump scheme
vandamme   2/26/2014 8:57:07 PM
NO RATINGS
I doubt the concept would pass a back of the envelope analysis.

Nancy Golden
User Rank
Platinum
Re: nothing is free
Nancy Golden   2/26/2014 8:43:14 PM
NO RATINGS
"MDIF would include streaming news and information (both international and local), applications and content (including Ubuntu, OpenStreetMap, and Wikipedia), educational courseware, and emergency communications."

How does it all get paid for? I would think it would be through advertsing - ads embedded in the content that has access to a global audience would be enticing to many companies.

networksguy
User Rank
Silver
Re: do the numbers..
networksguy   2/26/2014 6:15:17 PM
NO RATINGS
Indeed.  Link budget, round-trip delay time, antenna pattern (WiFi antennas aren't generally going to be directing much power upward - it's a waste most of the time), data rate, Doppler shift, ground track served by one microsat and number of subscribers in it, power available to the sat for transmitter, number of satellites needed and orbital tracks (are the poles, sub-Saharan Africa, and all of Asia covered, as they are for Iridium but not for Globalstar?), satellite orbital decay or graveyard orbits for so many sats, ..., the list of difficulties in doing what it appears they're claiming to do goes on and on.  In the absence of facts, some skepticism is called for.

To be generous, when they say WiFi, perhaps they mean "WiFi" in a non-literal sense -- some wireless networking method.  But calling it WiFi carries compatibility, data rate, coverage, and range implications that are at best misleading and at worst dishonest.

bobjengr
User Rank
Platinum
FREE WIFI
bobjengr   2/26/2014 5:00:23 PM
NO RATINGS
Cabe--It seems as though the barriers, both technical and legal, are significant but I certainly do think the system would be marvelous if brought to fruition.  I feel confident that with the advent of the Internet and social media we have a world in which countries are no longer satisfied with governmental status quo.  I think the Arab Spring proves that point.  Is there any feel for the cost of this effort?  Has to be millions if not billions.  Excellent post.

HowieD231
User Rank
Silver
do the numbers..
HowieD231   2/26/2014 10:05:36 AM
I ahve read about this initiative in several sources and it's obvious the financial guys have not hired any engineers yet. Based on a rough link budget, a LEO satellite would need an EIRP of about 4,000 Watts to be heard by a typical WiFi device on earth. That's allot of power for a big satellite and nearly impossible for a small satellite. The other problem is going to be doppler shift. A satellite in LEO is travelling around 17,000 MPH so the frequency change during the pass will be significant at 2.4 GHz, I doubt standard WiFi receivers will cope well with this. Satellites in LEO orbit are only visible for about 10 minutes a pass, even occasional access will require quite a few satellites. This project is a data broadcast only scnario, so the you still need some other means to send data back into the net. This are just a few of the technical problems. Using satellites to bypass national laws will not be tolerated under international laws and treaties. The satellite operator will find his license revoked and probably fined by the issuing authority. Space is not the "wild west", there are laws and regulations that do apply even if some are voluntary. The only waythis half baked scheme has a chance of working is if the satellites transmit to specially equipped gound stations that feed traditional WiFi access points for local distribution. This whole thing looks like a way for some financial "speculaotrs" to raise lots of money off of unknowing investors in order to skim off fees and expenses.

Crackle
User Rank
Silver
Comment on internet censorship
Crackle   2/26/2014 9:54:59 AM
NO RATINGS
Cabe, I was suprised to see the UK included next to North Korea and China in your list of the "bad boys" of internet censorship. I'd suggest this page for a better ranking of canditates: https://en.wikipedia.org/wiki/Censorship#Internet.

 

Page 1/2  >  >>


Partner Zone
Latest Analysis
During a teardown of the iPad Air and Microsoft Surface Pro 3 at the Medical Design & Manufacturing Show in Schaumburg, Ill., an engineer showed this "inflammatory" video about the dangers of maliciously mishandling lithium-ion batteries.
The Window Watcher stops the burglar before he does damage or enters the house. House alarm service companies set off alarms and call the service only after the burglar has damaged and entered the house.
If you’re designing a handheld device or industrial machine that will employ a user interface, then you’ll want to check out the upcoming Design News Continuing Education Center course, "Engineering Principles Behind Advanced User Interface Technologies.”
Brooke Williams of Texas Instruments explains how TI’s new TDA3x chip will help future vehicles “see” all around themselves.
It's been two years since the Mac Mini's last appearance on iFixit's teardown table, but a newly revised version joins Apple's lineup this week.
More:Blogs|News
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service