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Topic: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-27 19:16:53 and read 5314 times.

Has anbody ever gone against the cabin crew instructions and turned on their mobile/cell phone whilst in the air? I'm interested to find out how many people have actually done it.

Personally I have never done it, and never will do it.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: 7E72004
Posted 2004-04-27 19:20:08 and read 5276 times.

I remember flying on SW from IND to JAX and while in the air some ladies phone started ringing...and she could not figure out how to turn it off. The one good thing about that trip is that the guy who owned about half of SWA was sitting right next to me...drinks for everyone  Big thumbs up

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: FA4UA
Posted 2004-04-27 19:26:40 and read 5232 times.

The last three trips I worked I found at least one person on each flight using their cell phones in flight. None were actually talking on it, but rather playing games on them or using their personal planners. Now PDA's are wireless it's a continuing battle.

I politely asked one man to turn off his phone and he told me that I was being rediculous. I instructed him that my job onboard is to remind him of the regulations in place, and this is very much not allowed. He got mad at me and swore he would never fly United again. He said that everytime he flew AA that they let him use his cell phone as long as he likes while in flight. Sometimes adults act more like 2 year olds more then 2 year olds do.

FA4UA

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Tripseven
Posted 2004-04-27 19:28:27 and read 5209 times.

I inadvertently left my phone on once. I was flying to Hanscom, MA from LaGuardia on Shuttle America. My phone rang but the only way I could stop it was to open my phone (and hence "answer" it) and hit the power button. A little embarrassing but the plane didn't fall out of the sky or anything.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Shamrock_747
Posted 2004-04-27 19:34:06 and read 5171 times.

Well somebody was texting me whilst they were lining up on the runway on Saturday night so I had to quickly reply telling them to switch it off.

Not naming any names, MYT332...

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Jaspike
Posted 2004-04-27 19:36:29 and read 5136 times.

I thought I'd left it on from SFO-LHR (shameless plug of a trip report  Big grin), but I didn't. It was just after take off and I was sure I felt it vibrate, but no.  Smile

Tom

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-27 19:37:52 and read 5125 times.

Wow, it's surprising to hear that people do do it.

I think MYT either told me or I read it and the air steward telling him to switch his phone off  Smile

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Thawit76
Posted 2004-04-27 19:45:22 and read 5070 times.

I was on an Emirates flight from BKK to HKG, during the takeoff roll down the runaway, when the mobile phone of the passenger behind started ringing. He proceeded to chat on the phone until one of the flight attendants yelled at him to turn it off from her crew seat.

I talked to the flight attendant later in the flight and she said the pilots were picking up interference at the same time the guy's phone started ringing (is that possible that the pilots can actually detect if someone is using a phone while inflight?)

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Neednewairport
Posted 2004-04-27 19:46:30 and read 5058 times.

I have left it turned on in the checked luggage and airline employees told me not to worry about it. When I got to my destination it showed three missed calls.....

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: COEWRNJ
Posted 2004-04-27 19:46:57 and read 5052 times.

I've left it on a couple times, not even thinking about it, and all it did was drain my battery. I didn't get service or anything so it was a complete waist. Not that I would have been allowed to sit and chat had I gotten any reception.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-27 19:47:23 and read 5049 times.

They can probably detect if from a flickering on the screen or the navigation systems suddenly showing a completely different heading or something like that.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Cytz_pilot
Posted 2004-04-27 19:56:56 and read 4959 times.

ha ha ha,

He got mad at me and swore he would never fly United again.

Classic! He'll be back...I'm sure he's one of the 90% of travellers who don't give a damn who they fly as long as they get the cheapest fare...

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Airportugal310
Posted 2004-04-27 20:02:00 and read 4927 times.

On a couple of occasions I have had my cell phone ring in my pocket while flying my Cessna 172 around...the radios make a goofy noise but other than that, no big problems that I was aware of.

I am still here to talk  Smile

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Flyingbronco05
Posted 2004-04-27 20:07:36 and read 4888 times.

My phone has airplane mode.

I put it on that during flight. My phone is on, but I can't send or receive calls.

FB05

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-27 20:13:56 and read 4837 times.

A phone with airplane mode? weird. what phone?

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Flyer732
Posted 2004-04-27 20:21:53 and read 4783 times.

My phone has an Airplane Mode as well, I have a Seimens S56.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Geoffm
Posted 2004-04-27 20:22:09 and read 4783 times.

One solution: flight attendant doesn't actually speak to the offending person but discreetly makes a call to the cockpit. Pilot does some rough S-bends in the sky and seconds later comes on the intercom: "Would the person using their phone please turn it off as I can't steer this thing!". Might make a few people think again!

Geoff M.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-27 20:32:21 and read 4718 times.

It would be funny if pilots did do that  Smile

[Edited 2004-04-27 20:32:36]

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Starlionblue
Posted 2004-04-27 20:43:37 and read 4678 times.

Many Siemens phones have airplane mode. So you can play with the games and PDA functions. Basically this turns the transceiver portions off.


On a flight from Arlanda to UmeƄ, we boarded, then got off again (something broken on that plane). I turned on my phone and called the customer telling him I would be late. Forgot to turn it off. As we pushed back it rang, in my backpack in the overhead. PAH! Hurriedly turned it off, but the Captain still came on the PA reminding everyone that this was not allowed. Oops...

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Ezycrew
Posted 2004-04-27 20:49:35 and read 4637 times.

I had a Capt. once calling me because he could actually hear someones conversation on his frequency while we were lining up for take off. I found the offending (French lady, typical of our NCE flights, in her 70's, blonde, fully facelifted, botoxed and collagened) pax and ordered her to switch her phone off. She refused, so after a lot of arguing the capt. stopped the plane and said on the PA that we would not move until the lady in 17C gives her phone over to the cabin crew. Everyone applauded as she surrendered her cell phone in shame.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: MYT332
Posted 2004-04-27 20:52:18 and read 4627 times.

Well coming back from SSH i only remembered to turn my phone off over Athens, funnily enough it said no network.

Then last Sunday night i was bored ok, LHR has really big queues and whilst we were taxing out i thought id send Shamrock_747 a txt, or 5.
Haha when the f/a came round i had to hunch my self over to hide my phone, she gave me a really funny look and then made me show her my seat belt was fastened, i thought i was done for then but she never saw it....
Come on i did turn it off but only after i received a txt (the 1 telling me to turn it off!) everyone looking at me, a guy crying out we're all gonna die, a joke on his apart i hope, and the woman next to me getting so agitated i thought i best kill the phone before she had a panic attack! ahhhhh

-
Alex

feel free to email me with your disgust at
naughtyboywhokeepshisphoneonwhilsttaxing@tmfy.com

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Jaspike
Posted 2004-04-27 20:54:50 and read 4610 times.

Thinking about it, there was one time when my phone was on until we were going down the runway..

You can also email Alex at justinsmellsofwee@tmfy.com  Smile

Tom

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: N757KW
Posted 2004-04-27 21:20:53 and read 4530 times.

I have inadvertently left it on on several flights. Never had it ring or get any kind of reception in flight.

It did bother me a little when I left it on heading for Seoul. When I looked in my bag to get my water I noticed it was on. Ooopppsss

N757KW

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Planesarecool
Posted 2004-04-27 21:38:54 and read 4452 times.

I left it on all flight on the way and way back from Orlando. A mobile/cell phone is only a risk of interferrence if you are receiving a text or a call (or sending a text or call) and at 37,000 in the middle of the atlantic ocean, you're not exactly going to be able to make a call (no signal) therefore it just acts as an electrical device, which are allowed on throughout the flight, except on take off and landing.

-Stephen

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: LHcapt2007
Posted 2004-04-27 21:56:13 and read 4378 times.

I call from my plane all the time when I'm flying. I usually circle over my girlfriend's or friends' house and tell them to come outside, I'm a proud pilot, but its no airliner, just a Mooney. Good excuse to practice commercial standard steep turns. I have a hard time getting a signal and I can only imagine how many other signals it sucks up in the process.
On an airliner, no, but it seems like there are a few horror stories out there of people who tried to call and their one signal blocked hundreds of cell phoners on the ground? Or are those just fables...
Cheers,
LHcapt2007

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Pelican
Posted 2004-04-27 22:05:06 and read 4327 times.

Planesarecool,
are you sure about that a mobile is only a risk while receiving a text or a call? If you switch your phone on it will search for a network. And if there isn't a network like in the middle of an ocean it will continue searching a network. While it is searching it will constantly send signals and this can lead to interference... Hence I think mobile phones when switched on can cause at any time trouble. But in FL35 is enough time for the pilot to react on problems caused by your mobile. Though not during approach or take-off.



[Edited 2004-04-27 22:13:12]

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Ndebelebev
Posted 2004-04-27 22:06:09 and read 4318 times.

I left mine on by accident flying LHR-JKF and my friend remarked 'why didn't you end up in Calcutta or something?' Lol

What could it do to a plane really?

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: MYT332
Posted 2004-04-27 22:07:36 and read 4309 times.

Yea it will roam when its on, unless its in that flight mode, which on a recent ZB flight we were reminded that you werent even allowed your phone on in flight mode. My dad then turned off his phone  Smile

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Greg
Posted 2004-04-27 22:34:32 and read 4248 times.

All the time--but not intentionally, it only gets signal for about five minutes before/after takeoff (small beep)
I use my Blackberry all the time in flight---so far we've always landed at the right airport!.

There have been a few times when I've used on the taxiway..and I think once on approach just to see who if it would connect to Vodafone (UK). Usually, I'm pretty good about it.

I don't believe the BS about interference with the cockpit. Otherwise airports themselves would be a mess.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: BAViscount
Posted 2004-04-28 01:20:47 and read 4156 times.

I was at cruising altitude on an internal flight in Iceland last week when the phone of the guy across the aisle started to ring. He didn't make any attempt to switch it off, but instead carried on a conversation for a good couple of minutes. The F/A made no attempt to stop him, however I did point him out to the American lady seated next to me, who was just about to get up and do the F/A's job for her when the guy hung up. Not sure what would have been the more life-threatening, the guy using his mobile phone in flight, or what my fellow passenger would have done to him had he not hung up when he did!!  Big grin

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: 4xRuv
Posted 2004-04-28 04:24:23 and read 4037 times.

Another creative idea...

The F/A "accidently" spill the "courtesy" orange juice on the person that speaks on the phone. He will end the call immediately (just to shout at you - but hey, the job was done).

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: KaiGywer
Posted 2004-04-28 04:48:47 and read 3993 times.

I know WF was having problems with cell phones in the cargo hold. For some reason they would trigger the fire alarms. Until the fire alarms were changed, we were told to turn our cell phones off if we were to be inside the cargo hold.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Jcs17
Posted 2004-04-28 16:49:13 and read 3877 times.

I forget to turn my cell phone off all the time when I'm flying. Its never rang in flight, but it has rang during taxi.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Flyingbronco05
Posted 2004-04-28 16:58:30 and read 3856 times.

Cell phones do NOT interfere with the flightdeck.....


From this article:

"Plane makers Boeing Co. and Airbus Industrie have bombarded their aircraft with cell-phone frequencies and discovered no interference with communication, navigation or other systems. One likely reason that no problems were found: cellular phones don't operate on any of the frequencies used by airplane systems."

http://zdnet.com.com/2100-11-501431.html?legacy=zdnn



Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Teahan
Posted 2004-04-28 17:12:51 and read 3827 times.

If usage by ‘educated’ aviation enthusiasts is this widespread, I wonder about the general pubic... multiple times worse?

[Edited 2004-04-28 17:17:11]

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: SMcC
Posted 2004-04-28 17:13:53 and read 3817 times.


Regardless of how much or how little a switched on cell phone effects the aircraft, why do some people have such a hard time complying with a very simple regulation?
...one that has been around for a long time, we all know about it.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: C17Glbm
Posted 2004-04-28 17:29:53 and read 3765 times.

Flyingbronco05,
Next time you're up in a flightdeck, take a cell phone and have someone call you on it. Hold it next to or in front of the display screens and watch the display flicker.
Regardless of how little happens when a cell phone is switched on, people really should learn to accept the rules.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: British767
Posted 2004-04-28 17:34:01 and read 3748 times.

Phones doo seem to intefere with a lot of electronic devices. Make a phone call then put it next to your monitor or speakers. They will either flicker or make an electronic noise. Electronically, mobile phones are extremely loud.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Iakobos
Posted 2004-04-28 19:12:21 and read 3641 times.

Contrary to widespread belief, the use of cellphones in airplanes is not a technical issue.
Avoiding a lengthy technical explanation which many could not follow, let me put three factors in the light:
* from radar to radio-altimeter, there are a couple of dozen devices inside an airplane that radiate (much) more energy than the max 2W of a cellular phone, and this has been going on for many years.
* long-haul planes will sooner than later be equipped with the airborne equivalent of Wi-Fi (basically a cellular base station), and high-speed data OVER CELLULAR will be available to passengers. (btw the airline will charge you for it, on top of your own operator's charge)
* quite many pilots themselves (not all of them though) use their own cellphones in the discretion of the cockpit.
* many planes have satcom systems for passenger usage, these radiate an energy equivalent to quite a few cellphones.

Still, present rules forbidding (more or less strictly) cellphone usage have their good reasons.
Imagine applying safety procedures when everyone is talking or staring at a display ? Imagine what could happen in case of emergency ?
At best a nuisance, at worst total chaos.

ps: PC monitors are no communication equipment, do not have to comply with Electro Magnetic Interference standards, and as such are (almost) totally unprotected against any electric field in proximity. This is more than often the case with headsets as well.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: UN_B732
Posted 2004-04-29 03:20:37 and read 3549 times.

I was on an Aeroflot 767-300/ER flying SVO-JFK and I saw someone playing games on their Motorola V60. I was sort of worried; and the FA said as long as you don't make a call ;it's fine. I found that liberal policy kind of need; even though a cell phone sitll transmits/receives when it is on and can still cause interference; if I remember correctly.
-Mr. X

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: F9Fan
Posted 2004-04-29 08:47:30 and read 3436 times.

The problems with cell phones in flights is that they don't mess up the plane's navigation systems as they can really mess with the cell phone network below. You will be making a call using several towers simultaneously, and this could end up causing you problems with your bill.

That said, several passengers used their cell phones on the doomed 9/11 flights to relay final calls to their relatives. This is how the passengers on UA 93 found out about the WTC and the Pentagon. I also heard that a passenger used his cell phone to call 911 from the rear lavatory on UA 93.

F9Fan

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Fliboyz
Posted 2004-04-29 09:06:16 and read 3397 times.

For the people on here who can't comply with ANY Federal Regulations while on an airplane should NOT be flying. RULES WERE MEANT TO BE PUT IN PLACE FOR PEOPLE LIKE YOU!!!!!!

Just like the people who don't understand that all baggage must be stowed UNDERNEATH the seat in front of you or in an OVERHEAD bin. Just like when the seat belt sign is on and your walking around the airplane while turbulent thinking that your SUPERMAN and if the plane were to fall a few feet that your stronger than the airplane itself.

If the Flight Attendants were to issue citations for everyone who don't comply with these RULES, the FAA would be the richest Goverment Agency I think.

Regardless if cell phones MAY or MAY NOT interfere with aircracft systems during takeoff and landing or while operating in any way, that's why theres a rule for this. They are NOT sure, and why take the chances?

One day it may happen, than what? Don't blame the airline, don't blame the FAA, blame the JACKA_ _ who didn't understand what shut off your phone meant.

But that is just MY .02. If you take offense to this.....OH WELL...But is the truth.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Ryan h
Posted 2004-04-29 11:03:33 and read 3289 times.

Just about everyone knows what a mobile phone does to the car radio. I don;t know what effect it has on navigation systems etc.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Iakobos
Posted 2004-04-29 11:53:02 and read 3252 times.

Do kangaroos swim ?

Objects are designed to perform a task and nowadays pretty everyone of them has to reach a number of criteria before they can me marketed.
There is no (or almost) criteria involving electro magnetic interference applying to car radios, PC monitors, electric shavers, kitchen appliances, and all electric powered devices for which a possible EM interference does not hamper their safe usage.

No such thing is used in an airplane.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Pelican
Posted 2004-04-29 12:17:02 and read 3199 times.

The problem isn't one or two mobile phones in an aircraft. But imagine in a 747 with about 400 people with 300 mobile phones and all sending and receiving signals!
Your mobile phone sends and receives sporadically signals to the network especially when it has problems to find its network in the middle of nowhere.
The mass of signals would cause problems.
Hence everybody on the a/c have to switch off his/her mobile phone. The F/As can't say: ladies and gentlemen please switch of your phone except the guy in 11 C and the woman in 38 D.

pelican

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Delta767300ER
Posted 2004-04-29 12:31:19 and read 3162 times.

I have had several flights where I have left my cell on silent mode for the entire flight.

-Delta767300ER

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: 777236ER
Posted 2004-04-29 14:03:33 and read 3103 times.

Flyingbroncos, the FAA and JAA say you can't use a phone inflight, REGARDLESS of what 'mode' it's in. You may think you know better than them, but I can assure you that you don't.

Sec. 91.21 Portable electronic devices.

(a) Except as provided in paragraph (b) of this section, no person may operate, nor may any operator or pilot in command of an aircraft allow the operation of, any portable electronic device on any of the following U.S.- registered civil aircraft:

(1) Aircraft operated by a holder of an air carrier operating certificate or an operating certificate; or
(2) Any other aircraft while it is operated under IFR.
(b) Paragraph (a) of this section does not apply to--
(1) Portable voice recorders;
(2) Hearing aids;
(3) Heart pacemakers;
(4) Electric shavers; or
(5) Any other portable electronic device that the operator of the aircraft has determined will not cause interference with the navigation or communication system of the aircraft on which it is to be used.
(c) In the case of an aircraft operated by a holder of an air carrier operating certificate or an operating certificate, the determination required by paragraph (b)(5) of this section shall be made by that operator of the aircraft on which the particular device is to be used. In the case of other aircraft, the determination may be made by the pilot in command or other operator of the aircraft.
Effective Date Note: At 54 FR 34291, August 18, 1989, Sec. 91.21 was revised effective August 18, 1990, as set out above.



From an ASRS report - problems associated with PED interference:

http://aviation-safety.net/events/ped/ped-case.htm


Something else to prove that you're wrong:

http://www.caa.co.uk/docs/50/Gsm_intf.pdf

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Flyingbronco05
Posted 2004-04-29 14:41:05 and read 3043 times.

the FAA and JAA say you can't use a phone inflight, REGARDLESS of what 'mode' it's in. You may think you know better than them, but I can assure you that you don't.

Using cell phones aloft on commercial and private aircraft is banned not by the FAA but by the Federal Communications Commission, which regulates telephone use. In prohibiting airborne use in 1991, the FCC was mainly concerned about cell phones' potential to interfere with ground-to-ground cellular transmission.

The FAA has never outlawed cell-phone use in airplanes. But the agency supports the FCC ban "for reasons of potential interference," according to an FAA advisory. Despite the findings of the 1996 RTCA study, the FAA remains concerned about anecdotal evidence of cell-phone interference in flight records, says an FAA spokeswoman.


In the same article, it states no evidence has EVER been found that cell phones cause interference with the flight deck.  Big grin

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Lapper
Posted 2004-04-29 14:56:41 and read 3006 times.

I've been on a flight where someone's mobile hans rang while on final. He ws in 1C and the F/A went mad. Saying that, I have a friend who is an F/A who has sent text messages while on final.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: QIguy24
Posted 2004-04-29 14:59:04 and read 2998 times.

Nope.. I have never done that and I never will. I really love the "silence" there is in a aircraft. You hear mobilphones all day long at work, in buses, on trains and many other places. And thank god there is one place where you can't hear those damn ring tones..

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Lauda777
Posted 2004-04-29 15:14:59 and read 2958 times.

A lot of you may not be aware (especially in the US) about how much interference a GSM mobile phone causes even to the speakers in the car or at home, not just when its about to ring or you are about to get a TXT but constantly as it switches towers and searches for the network, if there is no network it will continue searching every few seconds, however the CDMA network (more popular in US) causes a lot less interference and you will find does not interfere with an AM/FM radio receiver or speakers.
But anyway most countries have both types of phones so this rule needs to stick, and let's face it these days an aeroplane is the only place you can go where you won't hear a phone ring, thank heavens for that!!

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Jet-lagged
Posted 2004-04-29 15:51:33 and read 2924 times.

I've left mine on accidently a couple of times flying into Hong Kong.

An engineering director of a well-respected asian airline commented to me that the worries about cell-phones and airliner safety was hooey.

I do get upset about people who use phones while we are waiting to close the door and once the plane stops. Airplanes are such confined places . . . .I wish they would have more patience!

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Iakobos
Posted 2004-04-29 16:50:43 and read 2890 times.

Lauda777,
Would you pls give some attention to previous posts.

If you would oblige, I will add:
-- to have an interference you need two devices, none of them is the culprit nor the victim, it is just that the functioning of one impairs the functioning of the other.
-- in the case of speakers and many electric powered devices for home use, these have no or little protection against electromagnetic radiation of any kind.
If you have problems with your speakers, it is simply that the speaker wires pick up the external electric field. Shield them or add a RF arrestor/choke just before they connect to the speaker box, (speaker) problem solved.
-- a cellphone, whatever the system, sends a signal at regular intervals, all the time, as long as it it switched on.
The purposes are basically: it identifies itself in the cell (and consequently the system knows in which cell to find the user), it senses the quality of the signal to/from the cell base station (thereby knows if it can remain on that cell or look for a better one), the same signal quality assessment allows also an automatic power adjustment (if the signal is "strong", the cellphone will powerback to minimum, 0.1 to 0.2W).
-- all cellular phones are similar and all have to apply to very tight criteria, the strictest ones being precisely for GSM.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: 777236ER
Posted 2004-04-30 21:38:37 and read 2785 times.

In the same article, it states no evidence has EVER been found that cell phones cause interference with the flight deck

Did you not notice this bit?

the FAA remains concerned about anecdotal evidence of cell-phone interference in flight records, says an FAA spokeswoman.

Topic: RE: Ever Switched On Your Mobile In A Plane?
Username: Saigonhouston
Posted 2004-04-30 21:46:11 and read 2758 times.

During my trip from LAX to TPE and somewhere in the middle of Pacific Ocean. I was curious to see what time zone or what kind of message it will show up on the cell phone screen. So I decided to turn it on. Guess what? It didn't work and my phone was fully charge before I took off in LAX

SaigonHouston


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