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Old 01-02-2007, 07:32 PM   #31
HomieG
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You pretty much won't get cell service at 30,000 feet with current cell antenna design. Cell antennas are directional in the vertical and horizontal plane. It's a waste of effective radiated power to have the angle of radiation so high as to allow coverage in the airspace above the antennas. Even on the omni-directional cell antennas, the angle of radiation is concentrated towards the horizon, or tilted slightly higher or lower, depending on the terrain. That way the tranmsit and receive performance of the cell antenna is optimized for it's coverage area and terrain. Airspace above the cell tower is generally considered to have no cell users and no reason to design antennas and coverage for that vertical plane.

And I'm still one of the many who really don't want to see cell service on commercial airliners. It's one of the few places to get away from the loud and rude gab that seems so prevalent these days...just my 2-cents...
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Old 01-02-2007, 08:01 PM   #32
ABAP4Life
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Quote:
Originally Posted by HomieG
And I'm still one of the many who really don't want to see cell service on commercial airliners. It's one of the few places to get away from the loud and rude gab that seems so prevalent these days...just my 2-cents...
I agree with you 100%. I would hate to be on a flight to San Francisco for 6 hours and be forced to hear 10 phone conversations. You know damn well they would be yelling like people do in public when on the cell.
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Old 01-03-2007, 12:27 AM   #33
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Quote:
Originally Posted by ABAP4Life
adam, I have yet to see a cell phone work on a plane 30,000 feet in the air. If what you say is true then ever phone should get at least a blip of service 30,000 feet in the air. A 30 mile reach would certainly allow service up there; you still have over 120,000 feet (over 23 miles) to go if you are at cruising altitude. Your scenario does not make sense to me. According to this article:
http://www.cnn.com/2006/TECH/12/21/w...nes/index.html
The use of cell phones is blocked by the FAA and not the FCC that is blocking the use of phones on the plane. It also sounds like they need to install equipment that will allow you to use the phones on the plane (I'm guessing it will boost the signal to get it to the ground).

I had a problem with the phone routing the calls through the wrong tower but that was because of a setting in the phone; or so the Verizon tech told me. That was about 10 years ago, back when you roamed by walking 10 feet in either direction; before the masses had cells.
Still, remember that they *can* work. It doesn't mean they will. You're still dealing with a two-way radio that puts out, at a maximum, 1.5 to 3 watts. You'd have to have peak conditions to make it work, like a clear sky, little to no radio interference, etc...possible, but more of a 1 in 50 shot than a working science.

Also, the phones are not directly blocked by the FAA. It is up to the individual airline to block them. If it were the FAA, all private planes would have to abide by the same rules.

Settings in the phone are true, but wiring cell signal is more of an art than a science. It's possible to put the service on 'home only' in your phone and achieve signal from a plane. Again, it's just not cut and dry as to turn on the phone and expect service.

Also, if cell phones were really THAT bad to where they could cause interference or damage, they wouldn't be allowed on planes, period. In a time where 9/11 caused paranoia, the FAA would demand all phones put into checked baggage or not past security.

Last edited by adamlp; 01-03-2007 at 12:30 AM..
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Old 01-03-2007, 07:55 AM   #34
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Quote:
Originally Posted by adamlp
Also, the phones are not directly blocked by the FAA. It is up to the individual airline to block them. If it were the FAA, all private planes would have to abide by the same rules.
Actually you are wrong. In order for an airline to allow them on a flight both the FCC and the FAA must approve them. Both organizations have them blocked at the moment.

I'd still like to see a cell phone work on a plane at cruising altitude. I would give me left arm to see that. I fly about every other week and every time I fly I try two cell phones; one Nextel and one Cingular and I have never had a signal on either of them. That's well over 100 attempts in the last 2 years.

EDIT: "Most cell phones can't reach a station from beyond 10,000 feet, said Roger Entner, an analyst with research firm Ovum Ltd."
http://www.washingtonpost.com/wp-dyn...005Apr7_2.html

Last edited by ABAP4Life; 01-03-2007 at 07:58 AM..
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Old 01-03-2007, 10:51 AM   #35
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Quote:
Originally Posted by ABAP4Life
Actually you are wrong. In order for an airline to allow them on a flight both the FCC and the FAA must approve them. Both organizations have them blocked at the moment.[/url]
http://www.wired.com/news/culture/0,1284,41177,00.html

Here's what I've found.

Quote:
The FAA used the findings of the RTCA, an independent aeronautics adviser, to justify the ban, although it leaves enforcement up to the airlines. The RTCA's three studies, published in 1963, 1988 and 1996, say handheld devices (excluding cell phones) should be banned during "critical phases of flight," which the airlines have interpreted as takeoffs and landings.

The studies don't include "intentional transmitting devices" such as cell phones and two-way pagers, because the organization did not receive the devices from the cell phone industry, planes from the aviation industry and funding to conduct the study. The RTCA works on a "volunteer basis so we had to rely on these people for the free use" of their equipment, Sheehan said.
As far as private jets:
Quote:
"I question (the prohibition of cell phones in flight) because they have a telephone if you pay for it," said Larry Murphy, vice president of sales and marketing for Flying Food Group.

Besides, Murphy says, "In private jets you can use your own phone."
That was the point I was making, not about the FCC.
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Old 01-03-2007, 10:59 AM   #36
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I think we are saying the same thing. Your post shows that the FAA created the ban but it is up to the airlines to enforce it. That is the same as other bans the FAA has created; they leave it up to others to enforce. That is just like any law in the US. One branch creates it and they leave the enforcement up to another branch/organization.
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