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admin | Category: Trace A Phone Number | 14.02.2014
When talking on a cell phone, a transmitter takes the sound of your voice and encodes it onto a continuous sine wave (see How Radio Works to learn more about how sound is transmitted).
Electromagnetic radiation is made up of waves of electric and magnetic energy moving at the speed of light, according to the Federal Communications Commission (FCC). When you drive or even walk around, the cellular system has some rather complicated software that determines when you're moving from the coverage range of one tower into another, and then seamlessly performs the switch over.
But for air travel, at maybe 10 times the speed, you'd need to switch cells quite frequently - I wonder if the network could keep up with this rapid hopping. But I've been hearing the government (the FAA?) has already granted airlines permission to allow use of cell phones in-flight. AFAIK- Airlines have not installed cell communications on board, so if one did allow it now it would presumably be with ground-based cell towers. As a side note, any on-board system would likely have to support multiple carriers, which is a bit more complicated than just dealing with a single ISP for internet connectivity. The cellular system was not designed to handle signals from great distances or which need rapid and repeated switching. The FCC has proposed rules that, if adopted, would give airline carriers the ability to allow passengers to use their mobile wireless devices, such as cellphones, to communicate with cellular frequency equipment while flying above 10,000 feet.
The proposed rules would make clear that there is no right to operate cellphones on planes as a default.
The FCC is considering whether advances in technology no longer warrant ? on a technological basis ? the prohibition of in-flight mobile phone use. In the early days of cell phones, an airborne cell phone used to wreak havoc on cell phone systems.
The FCC doesn't like airborne cell phones because they tie up resources in multiple towers simultaneously, reducing the overall bandwidth available for other users. I pretty much always leave mine on when I'm in private planes, and my experience matches what engineer_comp_geek says.
It's not that hard to set up a pico cell, I had to do it as the building we were in had horrible service. Get help, news and reviews for your iPhone through our comprehensive blog and growing community.


A sine wave is just a type of continuously varying wave that radiates out from the antenna and fluctuates evenly through space.
All electromagnetic energy falls somewhere on the electromagnetic spectrum, which ranges from extremely low frequency (ELF) radiation to X-rays and gamma rays. In this position, there is a good chance that some of the radiation will be absorbed by human tissue. You could reach a cell tower on the ground, but could the cell phone system keep switching your connection from tower to tower as you move along? So far no airline has told passengers they can use their cell phones in-flight, and I am not hearing they are just waiting for equipment to be installed. If an airline takes affirmative steps, and complies with applicable FCC and FAA rules, they would be permitted to operate an airborne access system that would allow them to provide the service and give them a greater degree of control over cellphones than exists today. This is purely a technical decision; it would leave airlines free to develop any in-flight phone usage policy they may wish.
Once you get above that, you get a weaker and weaker connection to the cell towers, drastically reducing your chance of a successful connection. As I understand it, the biggest problem was more that the phones were connecting to multiple systems simultaneously, not that it was connecting to multiple towers or that it was moving fast and switching rapidly between towers. The FCC ban on cell phones cites this as a reason, and also cites the FAA's concern for the potential for interference with aircraft systems.
If they are talking to a tower some distance away, they will crank up their transmitting power so that the remote tower can hear their signal. Just watch for the complaints about the stupendous cost of downloading data at 20,000 feet. SATCOM would be the easier and more reliable way as you'd be under the foot print of one, maybe two, satellites as you cross the US. Sine waves are measured in terms of frequency, which is the number of times a wave oscillates up and down per second. In the next section, we will look at why some scientists believe that cell phones are harmful, and you'll find out what effects these ubiquitous devices may have. Since cell phone users are a generally obnoxious bunch (it often seems like the best way to guarantee that someone will use a cell phone in a particular area is to hang a sign there saying that cell phone use there is prohibited), the cell phone companies just had to cope with the problems, and they ironed out all of the problems and redesigned the systems so that they could handle an airborne phone without any problems.


Despite what some folks say, cell phones really can cause interference to aircraft systems, though since modern planes are designed with potential interference from cell phones in mind, the chances if a cell phone causing an actual problem are fairly rare. If they are talking to a tower that is close and can easily hear them, they'll drop their transmitting power to save battery life. I don't watch it obsessively but I've seen no evidence of even intermittent connectivity (e.g. The cost is actually not that high, I think it was about $10k for one that supported all carriers.
But, there is going to be a roundtrip delay of 250ms I'd imagine and you'd need the sustained data rate to handle how many calls you think you need to have plus whatever data service the plane would provide.
Once the encoded sound has been placed on the sine wave, the transmitter sends the signal to the antenna, which then sends the signal out. The position of a transmitter inside a phone varies depending on the manufacturer, but it is usually in close proximity to the phone's antenna. You might get lucky and get a good signal bounce or catch an antenna sidelobe, but the chances of your cell phone connecting at those altitudes is pretty small. Some airlines are experimenting with picocells, as was already mentioned, since not only does this allow the airplane to provide service to passengers who want it, but it also drastically reduces interference from cell phones since all of the phones on the plane will reduce their transmitting power. So, in reality, all you need after the pico cell is a reliable data connection to the ground.
The radio waves that send the encoded signal are made up of electromagnetic radiation propagated by the antenna.
The function of an antenna in any radio transmitter is to launch the radio waves into space; in the case of cell phones, these waves are picked up by a receiver in the cell-phone tower.



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