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It's not so much the distance above the ground it's the speed you're travelling at in the aircraft. I belive the cell transmitters are transmitting more or less parallel with the earth's surface, they have no need to transmit straight up, and remember your pilot even says we'll be flying today at a height of 30 000 ft, about 11kms, pretty high.
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Posted: 2002-01-29 09:06:00
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In so far as the use of phones in airplanes is concerned one remark:
Apart from the fact that it is not allowed it is not possible because:
The antennas for the GSM Network are directional antennas which radiate and recieve in a circle around them but not directed towards the sky.
Reception on high buildings is possible because of the antennasplaced on the buildings/towers.
So in reality 100 m above the cantenna is the maximum you can have as reception.
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Posted: 2002-01-29 09:08:00
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Cell phones DO work in 30.000 feet, but the signals are not good! U get signals form different transmitors and the phone would avt weird, but it works. It has been tested by an operator in Norway
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Posted: 2002-01-29 09:51:00
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Fingers--> one little question out of interest: if I leave my phone on in a plane, do the pilots and cabincrew KNOW that it's me? Can they trace it somehow? Cos I was in a plane and they came up to me and said it once. Is that a coincidence or can they actually tell?????
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Posted: 2002-02-17 21:13:00
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a mobile won't work more than 100m above ground?
have you never been in a tall building?
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Posted: 2002-02-17 21:36:00
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Na they can't tell exactly who has a phone that's on, depending on where you are in the aircraft they might not even know that it's on, it all depends on weather or not you're near enough to any electronic equipment. It's not just phones either, there have been reports of gameboys and laptops interfering with navigational equipment, but again it is dependant on where you're sitting. When there is a report of something like this on a particular aircraft Boeing have been known to buy the offending article from the person involved and do their own tests with it.
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Posted: 2002-02-17 23:08:00
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regarding september 11th they didnt use the cellphones, they used the on board phones or didnt you see the documentary about it....
second...why in the world would anybody with a little bit off responsibility take the smallest chance off a airplane mailfunction because of some idiot using the cellphone or trying to....
i cant believe that some people even think about it....
it doesnt matter is there the technical possibility or not....the try is simple not worth the lifes in case it doesnt work
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Posted: 2002-02-18 00:52:00
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Krusel: Well put.
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Posted: 2002-02-19 11:23:00
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if cellphones were that dangerous everyone would be screened before boarding and it would be enforced that all phones were switched off...this is not the case, you can theoretically leave your phone on silent, not one ensures its off, it's just politely requested.
German regulations insist that all mobiles are switched off before boarding planes while UK airlines permit use of mobiles while engines are not running.
i've been on loads of flights where mobiles are left on in overhead luggage and as soon as we touch down they start ringing.
it's more a case of who has jurisdiction over the airspace and what regulations they have.
don't forget your not permitted to use Radio's either.
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Posted: 2002-02-19 12:31:00
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Mobile phones do cause interference. Theres an article i found on the internet reguarding all electronic devices on aircraft.
I think it was on
www.smartcockpit.com
Jamo
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Posted: 2002-02-19 14:00:00
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