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locked car door open via of cell phone
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Posted By:
Ron
Oct 06, 2004
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Received email that if your car door is locked and you lose (misplace) your keys and remote, call home via cell phone, have someone push the "unlock" on the other remote near a phone while you hold the cell phone next to the car. This is suppose to unlock the door, however isn't there a difference with radio waves and sound waves?
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Comments
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Page 2 of 4 pages < 1 2 3 4 > |
Maegan
in Tampa, FL - USA
Member
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Posted: Wed Jul 13, 2005 | 12:20 PM
Maybe people have simply mistaken the Onstar type devices for operating the locking mechanisms with a phone. I mean, they call, Onstar unlocks - they used their phone to unlock the car. Or it could have even been miscontrued further with someone watching this display, but not understanding what was actually happening. |
David B.
Member
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Posted: Wed Jul 13, 2005 | 02:06 PM
Now what we have to believe is that the Cell phone antenna resonates to some degree to the 400Mhz RKE [...]
No, we'd only have to believe that if every other possible mechanism of action had already been discounted. Please elucidate.
just consider the issues, how many things would have to fall into place to make this work
In other words, it neither violates the laws of physics nor is it unscientific, it's just highly unlikely.
the clock rates are so different between the RKE and the Digital speech encoder of the cell phone, now we introduce multiple sampling issues which are data rate asynchronous!!!
Cell phone DSPs operate at between 133 MHz and 400 Mhz (depending on model), and process audio signals in the range 20-20000 Hz into digital data, which is sent by 850/900/1800/1900 MHz carrier (GSM). ASK mode RKEs transmit a data stream of between 64 and 128 bits, at a rate less than 20000 Hz, on a carrier of around 400 Mhz.
Depending on what mechanism is proposed, there may or may not be asynchronous sampling issues. They are not inevitable. |
Dave
in Florida
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Posted: Wed Jul 13, 2005 | 11:26 PM
Ok, let me try to Elucidate a bit:
When I say that "we have to believe that the Antenna Resonates to the 400Mhz RKE to some degree", That would be one of those Laws of Physics that I was talking about! I hope I do not have to point out the relationship between Frequency and Wave Length, that is fundamental stuff. Now, even though the Cell phone Antenna is clearly not cut optimally for the 400Mhz transmission, there will be some resonance, and of course cancellation.
Now as to the "Highly Unlikely" factor! well, that would not be a Law of Physics matter but rather a simple statistics issue. I would say about a 50 Sigma answer.
Finally, Since you seem to agree that neither the Microphone nor the Antenna is a likely source, what mechanism would you propose for this highly unlikely event? Magnetic Resonance, Hybrid Coil Leakage or perhaps the old blast from the past, Heterodyning!! Perhaps some sort of as yet undiscovered Sneak Circuit.
Design and perform an acceptable Experiment, you know, "The Scientific Method" else, give it up as just one more WWW Non-Sequitur!!! |
~*sShimmeRr*~
in Adelaide, Australia
Member
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Posted: Fri Jul 15, 2005 | 04:34 AM
I was listening to a radio station 2 mornings ago where they debated this Urban Legend. So they decided to go and test it for themselves.
One of the hosts went out to the carpark and called the other who was On-Air at the time and they played what happened over the radio.
Apparently, it worked. But who knows whether the one in the carpark really did have the keys.... |
Snowy
in aeternum
Member
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Posted: Fri Jul 15, 2005 | 12:48 PM
"if you lose (misplace) your keys and remote, call home via cell phone, have someone push the "unlock" on the other remote near a phone while you hold the cell phone next to the car."
If you lost your keys, how would the person on the other end push the button? and if you left them at home how the hey did you gey the car away from home?? |
Charybdis
in Hell
Member
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Posted: Fri Jul 15, 2005 | 12:55 PM
I think most new cars come with at least two sets of keys now. I keep a set at home with my parents extra set, just in case. |
Maegan
in Tampa, FL - USA
Member
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Posted: Sun Jul 17, 2005 | 06:52 AM
I made 5 sets of keys for my car...and you can order multiple auto-unlock remotes. When my husband when to 'repo' his sister's car, I think it only cost him like $20 to get another un-lock device. I am notorious for locking myself out of my car, even my best friend had a copy, b/c she was usually the one standing outside my car waiting for my parents to come and unlock me.
It's not possible to lock myself out of my new car... |
Dan
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Posted: Wed Jul 27, 2005 | 11:38 AM
I tried this on a 2005 Jeep Grand Cherokee.
I have a Treo600 phone with digital service through SprintPCS.
I called a Landline phone and had my cousin hit the unlock on the key fob.
IT UNLOCKED!, I had my phone against the passenger side glass. We then tried to lock the car and it would not. I locked it again then did the test again, It unlocked! However we could not get it to lock. I then hung up the phone and he tried over and over to unlock the car with no luck.
I then tried this with a 97 Mercury Grand Marquee, and could not get it to work. |
Maegan
in Tampa, FL - USA
Member
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Posted: Thu Jul 28, 2005 | 07:04 AM
Too bad there's no way to actually prove this. I'll probably be a skeptic until I can try it myself. |
Maegan
in Tampa, FL - USA
Member
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Posted: Fri Jul 29, 2005 | 12:20 PM
AHA!!! I tried it. I was at my parents house...
My dad has an '04 Chevr Truck. I gave my mom instructions on what I was going to do. Then I walked over to the truck & locked it. I called my mom using her Nextel Cellular phone (not using direct connect, just the regular call feature) to her home phone. She pressed the remote keyless entry...AND THE TRUCK DID NOT UNLOCK!
THE TRUCK DID NOT UNLOCK WHEN A CELL CALLED TO A LANDLINE AND THE LANDLINE USER PRESSED THE UNLOCK ON THE KEYLESS ENTRY REMOTE. |
Josh
in sacramento
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Posted: Thu Aug 11, 2005 | 04:07 AM
this post is way off the topic but imma share it anyways... I have a nokia n-gage QD, and everytime someone calls me and i put it on silent instead of answering, i hear them talking. So i tired if they can hear me back but they cant, all they hear is the ringing sound and it goes to voicemail... thats how i caught my BF talkin shit about me... lol... anyways like i said its way off the topic but im just tryna share cool sh*t... |
Jeff
in Tucson, Az.
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Posted: Tue Aug 23, 2005 | 11:38 AM
This has got to be one of the funniest forums I have come across. Its full of a bunch of retards trying to talk with big words. You people dont even know what you are saying. A higher signal such as 900 mhz will pick up any lower transmission, just because you dont understand it doesnt mean it isnt happening. you may not be able tyo hear the signals, but the target receiver still knows they are there. Do you think all devices in an air port, or airplane operate exactly on a 900 mhz signal? No, they dont but your cell phone or PDA will still interfere. Why? Because it receives the lower signals as well. Everyone who denounces this process has either done it wrong, or has a car that scrambles its radio signal when it leaves the transmitor. I have a 99 Infiniti G20, and I will unlock my doors from across town all day long from cell phone to cell phone. Go cellect some data guys because you are stupid. |
JFKLiberal
in Fredericksburg, VA
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Posted: Fri Aug 26, 2005 | 09:35 AM
OK, a few weeks ago I played around with this and discovered several things:
1) I didnt need someone at the other end - worked just fine without the receiving phone.
2) I didnt have to be talking to anyone with a line open. As long as the cell phone was on it worked.
So I deduced that somehow the EM field from the RKE was causing an induced current that the transmitter in the cell phone was detecting then broadcasting to the cell tower, as it normally does, but the car receiver was able to pick it up and read the signal.
The receivere is expecting a signal at its synced frequency and only reads one peak in the transmission for the interval it is expecting even if there are multiples, so its transparent.
Then I got up this morning to do some more tests on it (after several weeks) to get more exact data, but nothing worked. So I am going to change my RKE battery today and see if that makes it work again. |
Sofa King Lame
in New Orleans
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Posted: Thu Sep 29, 2005 | 09:08 AM
Okay now, when I got this email I have to say, I was a skeptic. I immediately said "eff dat shit, that wont work, how lame" but like the jerkface I am, I had to try it.
So I called my girlfriend on my cellphone, she picked up and bitched at me about the mess I left in the bathroom this morning, and after she was done bitching I told her that I locked my keys in my car, and needed her to get my spare keys. At first she blew up, and said "hell no i'm not bringing your keys to you, call pop-a-lock you peice of shit" and i finally calmed her down enough to explain what I needed her to do.
So I put the phone up to the car window and hope for the best, but the dumb bitch didn't click the UNLOCK button, she clicked my AUTOMATIC START button, which started my car. No swear, at least I know it works, so I told her to click the correct button this time...
Nothing...
And again, nothing...
So here I am screaming and shit, going off like a madman, my gas tank was nearly on E and my keys were locked in.
I am back at work now, my car is running downstairs in the parking lot, and the keys are still locked in. When I get home I'm going to choke that hoe... |
jim stormer
in cleveland, ohio
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Posted: Sat Mar 11, 2006 | 08:01 AM
i heard about this theory last night for the first time. so, i had to check into it. aside from the concept of random harmonics, sampling, and all that stuff (which can NOT be discounted), i have one more thought. cell phone/tower communications actually have 2 "channels". one channel is for voice stuff (up to approx. 20khz). the other is the control channel. this is used to manage the call. while i can't find many specifics on this, i did find a screen capture of a program (see http://www.winradio.com/home/trunking.htm). look at the section of the image referring to the "Control channel frequency". it's at 460Mhz. if the range of frequencies used for the control channel is broad enough to cover the 315-450 MHz spectrum used by remote keyless entry systems, perhaps the "unlock" signal is being transmitted over this control channel. |
daveM
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Posted: Sun Mar 26, 2006 | 10:13 PM
To Quote Alex B
" This will only work if you simultaneously place one foot in a bucket of water while wearing an aluminum-foil beanie cap on your head... to amplify the signal. Trust me. "
I found this works every time with just a little alteration.
I had my wife stand next to me in the driveway next to the car. she called me on the cell and then pointed her key fob at the phone while I held my phone at the car.
Presto !
And to make sure it was not a fluke, I had her put her back to the car and try again. sure enough, it worked that way too.
Dave |
Jeff
in New Orleans
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Posted: Tue May 23, 2006 | 10:15 PM
Experimental Results
Heard this from a friend last week. He gave me a proof of concept and it seemed like it worked. But when I tried it at home I couldn't replicate the functionality over a longer distance. It did however work over a distance far larger then my RKE usually works from. Playing with the varibles, I discovered that I could unlock my door without anyone by the car with a cell phone still. I thought about it and tried more combinations and found that discoverd that I could lock and unlock my car from a much greater distance than usual when I held the rke close to my phone while it was connected or dialing to any other phone number, regardless of where the receiving number was. The effective range with my own cell phone was close to 1000 ft. With my room mates phone, which is from a different carrier I got much better range.
Try it see what happens |
Steve n Houston
in duh
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Posted: Fri Sep 01, 2006 | 09:54 PM
I did this twice today on two different vehicles, cell to cell and home wireless to cell
I worked both times ... didn't try to lock it back ...
IT WORKS. |
Andrew
in Oxford, UK
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Posted: Fri Sep 08, 2006 | 12:47 PM
I'm amazed to say that I tried it and it worked. I got my mother to call me on her mobile, and I put mine up to my sister's car door about 8 inches away from the handle and it unlocked. Although it's strange to note that this happened in south Florida, and the other few people on this forum that claim success are also from Florida. Is there something special going on down here? We use Cingular and the car was a 2000 Honda Accord... but yes, it seriously does work. Maybe only with certain phones or certain kinds of keyless entry? |
joemama
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Posted: Tue Sep 12, 2006 | 08:21 AM
i think this cell phone RKE signal thing is a hoax.
why would you hold the cell phone a foot or so away from the door? the receiver for the RKE system is usually located somewhere under the hood (but definitely not in the door), and wires are run to the door actuator. so, if this hoax really did work, wouldn't you be better off holding your cell phone near the hood (where the receiver is) instead of near the door (where the receiver isn't)?
or are they suggesting that the radio signal is transmitted across a cell phone line, which then gets turned into electromagnetic interference of some sort, which gets transmitted across the wire between the receiver and the actuator, the end result being the actuator unlocking the door? |
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