Why does my iPhone induce static with other electronics?

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DropGems

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Jun 29, 2007
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#1
When my iPhone is near the tv, car radio, ipod, etc... it goes crazy with that annoying static sound through all my electronic devices speakers. Anyone else get this? I actually have to move my iPhone into the other room when I'm in my kitchen because of the static that comes from my tv speakers
 

motuser

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Jul 18, 2007
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#2
My phone does the same thing. People say it's a GSM thing. It never happened with my Verizon (CDMA) phone.
 

oriolesfan23

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Jun 29, 2007
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#3
It happened some with my old phone, but nothing like it does with my iPhone. I can't keep it by my bedside anymore because my computer speakers go CRAZY with that annoying sound.
 

geordisjd

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Jul 1, 2007
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#4
It happened some with my old phone, but nothing like it does with my iPhone. I can't keep it by my bedside anymore because my computer speakers go CRAZY with that annoying sound.
Same here. "Without going into much detail .... the way GSM works is the phone checks in with the tower at a set interval to see if the tower has any calls waiting to be sent. This helps conserver battery power as the most power hungry device in the phone (the transmitter) isn't always powered on.
When the tower alerts the phone during one of these "check-ins" the phone connects and the call goes through."

I just keep it AWAY from all speakers. The problem is when I want to connect it to my stereo in my car, instead of my iPod. I still have an old fashioned tapedeck. The tape-direct connection works better than the radio frequency one, but the buzzing can be bad. Somebody suggested putting tin-foil around the connector. First, it's not very pretty in my beautiful car. Second, it doesn't seem to work!

The only think that works in putting the phone in "airplane mode". But then, bye, bye phone functionality. I don't think anything can be done.
 

rwnewton

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Jul 11, 2007
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#5
Blackberry's cause the same problem and it affects speakerphones at the office all the time. I noticed my iPhone has the same affect. Like geordisjd said, you have to move it far enough away from other electronics or go into airplane mode. It's a real pain.
 

kdarling

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Jun 20, 2007
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#6
GSM transmitters are turned on/off at 217 Hz. This beat is low enough that it's within human hearing range (the on/off cycle).

So that's the noise when you're on the phone.

When you're not on the phone, then every 55 minutes or so, the tower asks the phone if it's still there, and the phone replies, again making the noise.
 

ciaran00

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Jul 21, 2007
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#8
When I put it next to my alarm clock, the alarm clock display switches to radio station frequency and the frequency will cycle like crazy. Very spooky. I move the iPhone away and the clock display pops back.

This thing will give me cancer, I swear :p
 

geordisjd

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Jul 1, 2007
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#9
Maybe not, but if it does, it will be a well differentiated, well circumscribed, easily resectable iCancer, with a very high cure rate.:)

This thing will give me cancer, I swear :p[/QUOTE]
 

scrowner

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Jul 4, 2007
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#10
The only think that works in putting the phone in "airplane mode". But then, bye, bye phone functionality. I don't think anything can be done.
I placed it in ariplane mode! I drove for an hour on the highway and I got the GSM noise 7 times. Airplane mode does NOT eliminate this noise! I am using version 1.0.1. This noise is LOUD on the car sterio as it trumps the audio of the song. I was wondering why the people using the Apple headphones are not complaining about this. As this noise seems quite random and sometimes very long in duration.

But this is why I got the iPhone - to play on my songs on my car sterio have simple access to them. I too am using the retarded Monster tape converter bought in the Apple store. Waiting to get a PIE interface when I get the word it works.

This is a major bug in my mind.
 

kdarling

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Jun 20, 2007
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#12
It is due to the 800Mhz GSM frequency which ATT uses and TMobile does not.
Although you'd think that it'd be some harmonice of the radio frequency, it's not.

I already gave the answer:

It's the phone turning on/off its transmitter ~200 times a second. That pulse bleeds into unshielded equipment and causes the low buzz.
 

shawn

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Oct 11, 2007
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#13
If the interference is produced even in Airplane Mode, would it not seem that the Airplane Mode is worthless? I mean, if I were an aircarrier, I would ban iPhone use, even if the user was operating in Airplane Mode. If for no other reason as to be fair to those who actually turn their phones completely off.
 

bmargolis

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Jun 30, 2007
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#14
When my iPhone is near the tv, car radio, ipod, etc... it goes crazy with that annoying static sound through all my electronic devices speakers. Anyone else get this? I actually have to move my iPhone into the other room when I'm in my kitchen because of the static that comes from my tv speakers
When I was with Nextel, it did exactly the same thing. I never had that with Sprint (CDMA) or Cingular or AT&T before the iPhone.
 

sdge

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Jul 8, 2007
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#15
I know what everyone is talking about. My friend would plug in his tapedeck adapter (which was specifically made for iPhone because it has the tiny headphone jack) and it goes crazy... but HERE is the weird thing...


My iPhone does not make any of those noises. Even when using EDGE it doensn't make those noises. I have no explanation except that I am incredibly lucky.
 

electoman

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Sep 20, 2007
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Atlanta, GA
#16
I have not noticed this noise in my car, at my desk or at my home. I used to have a Nextel that did this all the time. Also, I have had a couple of Cingular (AT&T Wireless, too) phones that could produce the same sound. I have my iPhone connected to my computer speakers now, and never hear that noise. Strange that some do and some don't.
 

adseguy

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Jul 1, 2007
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#17
It's all about shielding. It's the same reason why you never want to cross audio wires at 90* even if they are shielded. Shielding helps keep away RF and EM fields out of the transmitting wire.
 

sdge

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Jul 8, 2007
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#18
It's all about shielding. It's the same reason why you never want to cross audio wires at 90* even if they are shielded. Shielding helps keep away RF and EM fields out of the transmitting wire.
Can you explain exactly what is shielding please?
 

adseguy

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Jul 1, 2007
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#19
Sure, I'll try my best. When electrons pass through a wire they will emit EM (electro magnetic) fields. To keep these fields within the wire, people will wrap them in a non conductive material then a conductive material around that. this "shield" is then grounded on either end of the wire. This will absorb a lot of the EM field and also absorb the outside interferance from another wire or other EM emitting device. The reason not to cross at 90* is because the EM fields will be out of phase by 90*. The iPhone gives off radiation just like any other phone and any non shielded wire will get bombarded with the signal and get amplified to the speaker. If shielding were in place the EM fields would travel down that grounded wire and your speaker wire is safe. The wire within the speaker isn't shielded and can still be affected by the cell phone radiation.
 

Standog

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Jun 26, 2007
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#20
I didn't get the interference at first, but lately, I get it periodically in my car or at home. I simply move the phone further away or turn it on airplane mode. About 5 feet seems to do the trick at home and the middle of the driver or passenger seat works well in the car.