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I will be testing this myself tomorrow, dont worry. |
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| Posted by |
Ash's Z on January 26, 2005 at 12:34 AM |
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This message has been viewed 66 times. |
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| In Reply To |
the e t is funny and my feelings arent hurt or anything posted by dn3m on January 25, 2005 at 11:34 PM |
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| Message |
What I am afraid of though is the fact that I dont have the same setup that you said actually works. There are specified bands of frequencies that are assigned for various uses. Broadcast radio on the FM dial is somewhere from 88MHz to 108MHz. Cell phones are in the microwave region (much higher), and I would imagine that car remotes are somewhere in the 24, 27, or 48MHz spectrum. It would seem to me that since the car's remote is at such a lower frequency than the the frequencies used by cellular, the signal would interlace very well with a higher frequency carrier wave (from the cell phones). Holding the car remote up to the phone and pressing the button is going to emit RF that will affect the RF coming from the phone. In effect, you are broadcasting the remote's signal via the cellphone signal by distorting the cell's outbound signal. I know that in order to compress the cellular phone's bandwidth, only a small band of frequencies are modulated on the carrier wave. This means that the frequency of the signal on the car's trasmitter's carrier wave must be within this range of frequencies that the cellphone's tower will carry else it will just be filtered out. The only catch to this is on the receiving end. Your girlfriend wouldn't have to put the phone up next to the car for it to work as the cellular tower would be the transmitter and it would be carrying the frequency that the car would pick up and unlock the doors. Have you tried this again? Interesting indeed. I'm still holding my breath though.

[ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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