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2008-06-16
, 06:27
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Posts: 4,783 |
Thanked: 1,253 times |
Joined on Aug 2007
@ norway
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#22
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anyone feel like digging up that mythbusters episode where a ground crew instrument tech talks about the aircrafts strobes being known to affect the instruments at times?
still, with the strobes the cockpit has a known cause and effect. if someone in there hits the switch for the strobes and see the instruments go all over the place, then turn them back of and see it settle down, then they report it and know about it.
its when no matter of hitting switches or similar helps that the people up front starts to get confused. and confused crew leads to crashes from what i understand...
still, with the strobes the cockpit has a known cause and effect. if someone in there hits the switch for the strobes and see the instruments go all over the place, then turn them back of and see it settle down, then they report it and know about it.
its when no matter of hitting switches or similar helps that the people up front starts to get confused. and confused crew leads to crashes from what i understand...
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2008-06-16
, 15:08
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Posts: 1,743 |
Thanked: 1,231 times |
Joined on Jul 2006
@ Twickenham, UK
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#23
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Originally Posted by Jerome
Well they're indeed designed to reduce the impact of interference during communication, but this only means that two communicating (and already synchronized) devices will 'jump' together to a new channel where to communicate. This will happen at every message AFAIK.
I am not here to tell you to do something illegal. I just pointed out that bluetooth and wifi are designed to minimize interference. Whether you are allowed to use them or not lies under the responsibility of the pilot. Emirates has an in-flight wifi network on some of their fleet.
It is actually a good thing that bluetooth and wifi are designed to minimize interference. You don't imagine the number of devices using either technology that are likely to be on during flight. Many users don't know how to switch off their laptop wifi and bluetooth. Modern game consoles have wifi (yes, that kid next seat playing on his DS lite uses an active wifi device). People turn their phone off, and forget about their headset. Etc, etc...
This does NOT reduce interference on the airplane instruments.
Newer planes have their cables protected by external signals, other do not.
And no one took its time to check if a device actually interferes with the instruments and how much. So they take the easy path and forbid use. [1]
Actually they are even worried about the "implicit" signals leaked by a running device. The chips themselves emit a wave of signals and those too can interfere.
So, for them and at least during take off and landing, it's much more easier to force you to turn them off.
[1] with "no one" I mean official sources, not mythbusters
Last edited by anidel; 2008-06-16 at 15:10.
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2008-06-16
, 15:09
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Posts: 1,743 |
Thanked: 1,231 times |
Joined on Jul 2006
@ Twickenham, UK
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#24
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Originally Posted by tso
I remember that one
anyone feel like digging up that mythbusters episode where a ground crew instrument tech talks about the aircrafts strobes being known to affect the instruments at times?
Pretty funny.
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2008-06-16
, 20:08
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Posts: 477 |
Thanked: 118 times |
Joined on Dec 2005
@ Munich, Germany
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#25
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Originally Posted by anidel
Well they're indeed designed to reduce the impact of interference during communication, but this only means that two communicating (and already synchronized) devices will 'jump' together to a new channel where to communicate.
I suggest that you read the Wikipedia description of bluetooth, point "Air interface", or turn a spectrum analyser at a working bluetooth transmitter. Bluetooth switches channels 1600 times a second.
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2008-06-16
, 21:43
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Posts: 481 |
Thanked: 65 times |
Joined on Aug 2007
@ Westcountry, UK
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#26
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Originally Posted by bunanson
Don't know what your definition of a brain is here, but the plane you are sitting in has a fully functional GPS system, so why would it not work?
@Geneven: Yes, I saw those pics. I still believe it has something to do with your altitude, once you got to certain altitude, you will NOT pick up anything. Will somebody has wings and has brain step up please?
Sure if you go beyond the height of the satellites you are going to have to do some fancy calculations, but in a commercial airliner you are fairly safe.
Whether you can pick up much inside the passenger compartment of a plane I don't know (although I don't see why not).
The only other thing I could foresee, is that to enable a quick pickup, most sold GPSs make certain assumptions to get a lock, and one of those assumptions may be that you are not going several hundred miles an hour, several miles up, so it is down to the individual unit as to how it performs.
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2008-06-16
, 21:45
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Posts: 4,930 |
Thanked: 2,272 times |
Joined on Oct 2007
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#27
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If such assumptions are a problem, it still might be able to keep a lock, supposing you don't have to turn it off during takeoff.
Oh, and airplanes are big aluminum tubes; I think a window seat will definitely be desirable for getting a lock in the air... probably enough signal gets in through the windows to keep a lock in any seat, but I'm obviously just speculating.
Oh, and airplanes are big aluminum tubes; I think a window seat will definitely be desirable for getting a lock in the air... probably enough signal gets in through the windows to keep a lock in any seat, but I'm obviously just speculating.
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2008-06-16
, 21:51
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Posts: 5,795 |
Thanked: 3,151 times |
Joined on Feb 2007
@ Agoura Hills Calif
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#28
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"it's much more easier to force you to turn them off."
But of course they don't force you to turn them off. They ask you to turn them off. As I pointed out in my semi-joke about using them as a terrorist weapon, there is nothing preventing people from turning them on in their pockets.
And if someone DOES leave their gps or other device turned on, is there technology on the plane that would allow the authorities to find the culprit? I doubt it.
But of course they don't force you to turn them off. They ask you to turn them off. As I pointed out in my semi-joke about using them as a terrorist weapon, there is nothing preventing people from turning them on in their pockets.
And if someone DOES leave their gps or other device turned on, is there technology on the plane that would allow the authorities to find the culprit? I doubt it.
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2008-06-16
, 23:17
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Posts: 481 |
Thanked: 65 times |
Joined on Aug 2007
@ Westcountry, UK
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#29
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Originally Posted by geneven
Well, no, a GPS is a receiver, it doesn't transmit anything.
And if someone DOES leave their gps or other device turned on, is there technology on the plane that would allow the authorities to find the culprit? I doubt it.
From my point of view though, if you are on a plane and they ask you to turn something off, regardless of the technical merit of the request, I would just consider it rude to not do so!
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2008-06-16
, 23:32
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Posts: 4,030 |
Thanked: 1,633 times |
Joined on Jul 2007
@ nd usa
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#30
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Originally Posted by tabletrat
To Tabletrat and Geneven: I stand corrected. I agree, in general, GPS should work under most altitude, mine is not, dont know why. And as other people has put it, theirs work in USA/Europe/Asia. Mine does not work in Asia at all. But now I am back in USA, the BT GPS works like a charm. Does GPS has to log with a 'particular' satellite, or any satellite, with tirlaterization will do? witch crafts!
Don't know what your definition of a brain is here, but the plane you are sitting in has a fully functional GPS system, so why would it not work?
Sure if you go beyond the height of the satellites you are going to have to do some fancy calculations, but in a commercial airliner you are fairly safe.
Whether you can pick up much inside the passenger compartment of a plane I don't know (although I don't see why not).
The only other thing I could foresee, is that to enable a quick pickup, most sold GPSs make certain assumptions to get a lock, and one of those assumptions may be that you are not going several hundred miles an hour, several miles up, so it is down to the individual unit as to how it performs.
bun
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It is actually a good thing that bluetooth and wifi are designed to minimize interference. You don't imagine the number of devices using either technology that are likely to be on during flight. Many users don't know how to switch off their laptop wifi and bluetooth. Modern game consoles have wifi (yes, that kid next seat playing on his DS lite uses an active wifi device). People turn their phone off, and forget about their headset. Etc, etc...