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Wi-Fi Coming on U.S. Domestic Flights
jvptoad writes "The NY Times is reporting that United Airlines has received approval to offer Wi-Fi Internet access on its planes. Although it will be over a year before the service is available, I wonder if this will impact the discussion on cell phone usage in planes (which seems to be centered around the annoyance of people talking loudly on the phone). Add a headset and Skype, and you don't need a cell phone to have loud, annoying phone conversations on an airplane."
Sure the technology will be there (vonage, skype with 802.11 phones)...
but the jitter as your packet is relayed via satellite back to firma terra will be enough to discourage most calls (i have to imagine).
Still... real-time data connectivity while in the air will greatly increase my productivity while flying.
Now United needs to offer power injectors at each economy plus seat
I flew LuftHansa (the German partner of United) 3 weeks ago as they were starting offering this service, and i did try it for free. It works pretty well. Normal cost is 10 bucks for an hour or 30 for the whole flight. Unfortunately, i was travelling in Economy where you can't plug your laptop. And Wifi drains my battery pretty fast. still managed to send emails from above some really remote places...
Three things.
1. Many kinds of radio receivers create a local "intermediate
frequence" (IF) version of the received signal at a much lower
frequency because it is easier for circuitry to deal with those low
frequencies. Unfortunately, this IF signal leaks out, and those
frequencies are close to those used for navigation. The FAA,
reasonably, objects to that.
2. Cellphones are based on the idea of short range communications
(from your phone to the celltower you could likely see if you knew
where to look) allowing the bandwidth you are using to be reused
many times in one city. When you turn on your phone in a plane at
high altitude, your phone (being far from any cell site) turns up
to full transmit power, and blankets several *states* worth of
territory. A lot of frequency reuse can't happen when you do that.
The FCC, reasonably, objects to this. (How can cellphones inside a
plane soon be allowed? By having a small cellsite inside the
plane, instructing phones on the plane to turn their transmit power
to the lowest setting.)
3. General purpose conservatism. A powerful transmitter (ham radio
anyone?) can also mess with lots of nearby electronics. Given all
of the confusion over what kind of electronics some device might
be, and given how pissed off you would be if your plane were
plummeting to earth because a bad decision, being conservative
might be OK, even with you.
This doesn't mean silly things don't happen. I was once (long ago)
told I couldn't listen to my CD player on a plane. The airline
uniformed backhaul "expert" told me that the CD player had a "laser!",
and it could interfere with the plane. Nonsense. I expressed
disbelief, suggesting that the laser was safely inside...but the
expert didn't buy it and he had authority over me so I shut it off.
However, just because he was completely wrong in his argument doesn't
mean that every airline safety rule (air in the tires?, gas in the
tank?, sober pilot at the wheel?, no shootouts happening on the
plane?) is silly.
-kb
Posting anonymously so I don't get in trouble tomorrow when I go to work tomorrow ;-) :-) Any Connexion equipped plane has a few Linux machines running on it (no wonder I love my job).
The plane linked in the picture is CBB1, our test platform. This plane has 3 of our antennas on it: two phased array antennas and one mechanically steered dish antenna(the Melco antenna mentioned above). The first two (very flat) rectangular bumps towards the nose of the plane are the phased array antennas. These antennas are each capable of simulatenously tracking multiple satellites, which can be used to provide directTV as well as internet service. They can also be configured to use one antenna for receive, one for send. None of our customers has multiple phased arrays due to the cost (VERY expensive) and this antenna is only used for government and business jets. The rearmost (largest) hump is the Melco antenna that was mentioned above.
Connexion is actually far superior to what is offered by Verizon. We offer far more services than anybody here knows. We offer our service on planes, vehichles, and boats. We also offer much more bandwidth than Verizon. Our system has the capability to recieve at nearly 80Mb/sec (none of our customers has ever used this capability since it requires extra antennas that increase cost and drag (one antenna == 20Mb up and down)), and transmit at nearly 20Mb/sec. We also offer a number of other services that I don't think we have anounced yet, but are REALLY cool.
Oh, yeah, I almost forgot to mention, Connexion is based on Linux