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Author Topic: This is amazing, and it actually works!  (Read 3276 times)

Offline Schmengie

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This is amazing, and it actually works!
« on: December 05, 2008, 01:50:52 am »
You've gotta try this. (Preferably while no one's looking...) :rofl: :rofl: :rofl: :rofl:

http://www.topgear.com/us/videos/more/central-locking-range/
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Offline wing

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Re: This is amazing, and it actually works!
« Reply #1 on: December 05, 2008, 07:42:22 am »
I do this all the time.  Last time I was at a restaurant and forgot if I had locked the car, it was parked pretty far away.  I hit the button 2 or3 times nothing.  Put it against my head and the lights went and the horn.
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Offline Wolverine

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Re: This is amazing, and it actually works!
« Reply #2 on: December 05, 2008, 08:01:34 am »
Learned that a while ago. First time it gave me some headache tho...
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Offline Wetson

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Re: This is amazing, and it actually works!
« Reply #3 on: December 05, 2008, 09:40:41 am »
I want to know how/why that works.  Incredible.  I've heard about this before but have never actually seen it done.
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Offline initial_D

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Re: This is amazing, and it actually works!
« Reply #4 on: December 05, 2008, 11:29:31 am »
One professor at the university where I went years back mention that the human body is about the equivalent of a 1 Kilo-Ohm conductor. So in a way, the body could act as a "wire", conduct electricity, and be an extension of an antenna.
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Offline The Mighty Duck

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Re: This is amazing, and it actually works!
« Reply #5 on: December 05, 2008, 12:01:46 pm »
Yeah...  same reason an FM radio sounds better when you touch the antenna to adjust it, but sounds like crap again when you take your hand away.
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Offline Railton

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Re: This is amazing, and it actually works!
« Reply #6 on: December 05, 2008, 05:19:39 pm »
Quote from: Demosthenes X on December 05, 2008, 12:01:46 pm
Yeah...  same reason an FM radio sounds better when you touch the antenna to adjust it, but sounds like crap again when you take your hand away.
Does a key fob work on the same frequency band as FM?
Railton
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Offline The Mighty Duck

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Re: This is amazing, and it actually works!
« Reply #7 on: December 05, 2008, 06:17:42 pm »
Quote from: Railton on December 05, 2008, 05:19:39 pm
Does a key fob work on the same frequency band as FM?
Railton

Not quite.  FM (over here at least) uses the 87.5-108 Mhz band.  Remote Keyless Entry systems generally operate around 300 Mhz.  But they are both radio frequency devices, so the same principle applies.
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Offline dr_spock

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Re: This is amazing, and it actually works!
« Reply #8 on: December 05, 2008, 07:34:36 pm »
Does the key fob use frequency modulation to communicate with your car as opposed to amplitude modification?

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UmroAyyar

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Re: This is amazing, and it actually works!
« Reply #9 on: December 05, 2008, 07:39:52 pm »
Quote from: dr_spock on December 05, 2008, 07:34:36 pm
Does the key fob use frequency modulation to communicate with your car as opposed to amplitude modification?



You should do a site survey before attempting this.  :P
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Offline DockMan

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Re: This is amazing, and it actually works!
« Reply #10 on: December 05, 2008, 07:45:42 pm »
Quote from: Demosthenes X on December 05, 2008, 12:01:46 pm
Yeah...  same reason an FM radio sounds better when you touch the antenna to adjust it, but sounds like crap again when you take your hand away.

If that is the case shouldn't you get the same effect from just holding the fob in your hand? Weird though...  :foil:
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Offline dr_spock

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Re: This is amazing, and it actually works!
« Reply #11 on: December 05, 2008, 07:52:21 pm »
quote author=UmroAyyar link=topic=60226.msg542735#msg542735 date=1228523992]
You should do a site survey before attempting this.  :P
[/quote]

Only if you're giving me a digital spectrum analyzer for Christmas.  :)  They can cost as much as a car.  

You can probably extend the range of your fob by installing an omnidirectional high gain antenna with same frequency range of your fob in your car.  
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Offline The Mighty Duck

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Re: This is amazing, and it actually works!
« Reply #12 on: December 05, 2008, 07:52:51 pm »
Quote from: DockMan on December 05, 2008, 07:45:42 pm
If that is the case shouldn't you get the same effect from just holding the fob in your hand? Weird though...  :foil:

Have you tried using your fob without touching it?  Maybe if you use your tongue...  :D

In theory, you should be right.  The bone structure of your head helps, I believe, but the different frequency band might make a difference, too...

Quote from: dr_spock on December 05, 2008, 07:34:36 pm
Does the key fob use frequency modulation to communicate with your car as opposed to amplitude modification?

That depends on your car.  Does the horn honk in stereo, or mono?

In all seriousness, nothing I can find easily will say.  All just say it uses "radio frequency".  *shrug*
« Last Edit: December 05, 2008, 07:54:40 pm by Demosthenes X »
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Offline The Mighty Duck

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Re: This is amazing, and it actually works!
« Reply #13 on: December 05, 2008, 08:57:16 pm »
And, in case anyone is wondering, using your cell phone to unlock your car does not work.  :)
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Offline Black Hatch

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Re: This is amazing, and it actually works!
« Reply #14 on: December 06, 2008, 02:19:06 am »
Quote from: Demosthenes X on December 05, 2008, 08:57:16 pm
And, in case anyone is wondering, using your cell phone to unlock your car does not work.  :)

Yes it does!!!!
Ive seen it work... thats how Onstar does it.
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Offline dr_spock

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Re: This is amazing, and it actually works!
« Reply #15 on: December 06, 2008, 11:00:15 am »
Quote from: Demosthenes X on December 05, 2008, 08:57:16 pm
And, in case anyone is wondering, using your cell phone to unlock your car does not work.  :)

You could do it but you'll need a second cell phone wired to your car security system or have a bluetooth interface between the two. 

Also works great for detonating your car bomb.  :)


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Offline The Mighty Duck

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Re: This is amazing, and it actually works!
« Reply #16 on: December 06, 2008, 11:09:05 am »
Quote from: Black Hatch on December 06, 2008, 02:19:06 am
Yes it does!!!!
Ive seen it work... thats how Onstar does it.

OnStar is a different story.  That's a functionality built into the vehicle.  But most RKE systems use radio frequency, which cannot be transmitted by simply holding a key fob up to a cell phone.  I'll wager that method wouldn't even work with OnStar, since the remotes probably still use RF.
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Offline safristi

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Re: This is amazing, and it actually works!
« Reply #17 on: December 06, 2008, 12:53:18 pm »
..touch yer own FOB.............on   FOB   off........... :-*....(FOB!!! Friends OF BRIDGEY??? :P)
« Last Edit: December 06, 2008, 12:54:51 pm by safristi »
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