Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73121
Sorry peeps, urban myth!! Tried it with me on mobile & SWMBO at home 35 miles away, didn't work.
3rd Aug 2010 5:41 pm
dick dastardly
Member Since: 29 May 2007
Location: wiggleigh bottom
Posts: 1112
Honestly officer, I was just trying to get into my car. The batteries in the fob are weak and was holding the fob next to my erect penis to amplify the signal as recommended on a well known web site....There's one wheel on my wagon, but i'm still rollin' along, it's the cherokee, they're after me, but I'm singing a happy song
3rd Aug 2010 9:57 pm
crews control
Member Since: 18 Mar 2007
Location: Dorset
Posts: 5011
The phone trick is obviously a myth (you can't transmit RF over a audio channel - if you could there'd be a lot more fun to be had just ringing people up!) but the keyfob against the head thing is real, try it.
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Sorry peeps, urban myth!! Tried it with me on mobile & SWMBO at home 35 miles away, didn't work.
Not entirely. Our remotes are radio frequency. Some early ones were ultrasonic, and it (probably) worked for them.A vaccine does not stop you catching a virus, or passing it on, or getting ill from it, really ill. It does reduce the likelyhood of you dying when really, really ill. Stay Alive - KEEP AWAY FROM PEOPLE.
3rd Aug 2010 10:30 pm
cfcjim
Member Since: 22 Jun 2010
Location: Munich
Posts: 67
Urban myth,
Telephone microphones and speakers are cannot transmit ultrasound as it is below their frequency range.
To keep costs down telephony equipment only transmits from 300hz to 3.4Khz. Higher quality mobiles may well be sensitive to higher frequencies but certainly not lower.
. . . ultrasound as it is below their frequency range.
To keep costs down telephony equipment only transmits from 300hz to 3.4Khz. Higher quality mobiles may well be sensitive to higher frequencies but certainly not lower..
I'm sure you meant to type "above" there as Ultrasound is sound with a frequency greater than the upper limit of human hearing (greater than 20KHz).
Silicon chips have made sound compression cheap, and a much wider range of frequencies are now transmitted digitally. For the "unlock over telephone" to work it does also have to be an analogue telephone system.
So back to carrying a spare key gaffer-taped to an obscure compnent somewhere on the underside of the vehicle.A vaccine does not stop you catching a virus, or passing it on, or getting ill from it, really ill. It does reduce the likelyhood of you dying when really, really ill. Stay Alive - KEEP AWAY FROM PEOPLE.
4th Aug 2010 3:03 pm
cfcjim
Member Since: 22 Jun 2010
Location: Munich
Posts: 67
@Navigator:
Whoops! Quite, thanks for the cocrrection.
4th Aug 2010 3:45 pm
cookie42
Member Since: 10 Sep 2010
Location: preston
Posts: 3
sorry but no way does this work
10th Sep 2010 9:01 pm
cjdck
Member Since: 06 Mar 2010
Location: kinross
Posts: 48
i tried it about half a mile away an nothing happend!
10th Sep 2010 9:15 pm
NJF
Member Since: 05 Oct 2007
Location: Gone
Posts: 2466
DSL wrote:
I'm assuming planet wide!! Might try it from Tunisia.
Seriously, Derek, it does work. You just need to hold your phone against the right spot of the door. I'll show you when we're in Tunisia - you lock your key in your car and call your missus to unlock it from Blighty by transmitting the signal from the spare key over the phone. It will certainly work.
I remember when I found out about this years and years ago (early '90s). Was getting a car alarm installed and the installer was telling me this trick. I didn't believe him at the time, but I had to try it. Sure enough it worked. Ever since then every time I use a remote, I point it at my head. Even if it is 10 feet away, it's just gotten into a habit by now. And I wonder if anyone has caught me doing it.
lad wrote:
Ad15 I have known that trick for years, if you hold your fob near your head it will lock/unlock your car from further away than it would normally, BUT I can't remember how I found it out!!! Can you remember how you found out? Before anyone knew about the trick, why would you put your fob near your head to lock/unlock the car
22nd Sep 2010 2:33 am
AAA.Happy.Disco1.Fan
Member Since: 04 Nov 2010
Location: West Yorks
Posts: 2895
Just so I (try) never to do it - how does one lock one's keys in a D3 without having the other set with one, and so being able to use those to .....
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