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@masseur: the thing is, when i went to a technology show here in stockholm, i tried to print through the photosmart 3310 they had at a booth, it had bluetooth and all. It took me 30mins to get it on the screen, and i have at least 200 other phones there too. The phone crashed 2 times because of overflow i presume. If it does not have 100m bt, it sure feels like it.
This message was posted from a Z1010
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Posted: 2006-01-18 08:12:53
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IMO the range of BT depends on the power of BT transceiver, not on wether it's BT 1.0, 1.2 or 2.0. The version only means features like stability, speed, etc.
BT 2.0 however has been enhanced with better speed, lower power consumption, better error correction so that it can effectively operate at longer distance (even longer than 100 meters is possible) with better speed and stability compared to previous BT versions. That's probably why people just assumed right away that if it's BT 2.0 it has a long range.
BT in phones normally operate at a power enough for a radius of about 10m. If you have a 100m BT adapter on your computer however, your phone can still communicate with your computer at that distance because it's the strongest power that prevails -- much like your phone and the cellsite.
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Posted: 2006-01-18 08:37:04
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BT in phones normally operate at a power enough for a radius of about 10m. If you have a 100m BT adapter on your computer however, your phone can still communicate with your computer at that distance because it's the strongest power that prevails -- much like your phone and the cellsite.
Don't forget that communication is bidirectional, so BOTH adapters should be powerful enough to transmit at 100m, and then we have the problem of "propagation speed", which limits (theoretically) ethernet cables at a maximum of 100m. If BT is sensitive to "propagation speed" there will be a distance in wich communication will be poor, no matter how powerful the transmiter is.
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Posted: 2006-01-18 19:58:58
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On 2006-01-18 19:58:58, origami2002 wrote:
Don't forget that communication is bidirectional, so BOTH adapters should be powerful enough to transmit at 100m, and ...
Not necessarily. As long as they have very good receivers they should be able to detect signals from a farther distance. Some BT adapter has an external antenna maybe that's what helps it catch signals from far away.
If both communicating units have to have the same power in order for them to communicate properly, then how many Kilowatts should our cellphones transmit for it to communicate with a faraway cell site?
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Posted: 2006-01-19 03:52:16
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If both communicating units have to have the same power in order for them to communicate properly, then how many Kilowatts should our cellphones transmit for it to communicate with a faraway cell site?
I didn't say 'same power', I said 'powerful enough' , cell system antennas are more powerful because mobile antennas are much smaller and harder to reach, in contrast a signal sent by your cell phone, much weaker, will be received by the larger antenna, and received correctly.
So, yes, if you have a bluetooth device with a very big antenna for reception you can pick up a very distant, weak signal, and if your transmition is 'powerful enough', you can answer back.
And don't forget 'propagation time', there is no (known) way to circunvent it, as electromagnetic signals travels at light speed, there is no (known) way to make it faster.
I may be wrong, of course.
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Posted: 2006-01-19 17:18:38
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