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y doesnt bluetooth use. |
p900 lover
Joined: Jan 08, 2004
Posts: > 500
From: London
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this is probobly the most stupidest question but y doesnt bluetooth use the same type of frequency as cordless house fones do ?
then u could have further range
[ This Message was edited by: p900 lover on 2004-05-02 16:38 ] |
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p900 lover
Joined: Jan 08, 2004
Posts: > 500
From: London
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ok may be not the same frequency but sumthing like it
e.g
radio controled cars
walky talkys
home phones |
JaymoFish
Joined: Nov 24, 2003
Posts: 70
From: Perth, Western Australia
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It does use the same frequency, 2.4ghz.
Most new cordless phones are 2.4ghz, so are 802.11g/b wireless networks. |
Lars
Joined: Jun 01, 2003
Posts: 438
From: Singapore, Asia
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http://electronics.howstuffworks.com/bluetooth5.htm
this will answer your question.
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p900 lover
Joined: Jan 08, 2004
Posts: > 500
From: London
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so y can i use my cordless house fone in the garden (like 70 meters) with no problems and my bt headset will only wort around a 5/7 meeter distance? |
mmsman
Joined: Dec 14, 2002
Posts: > 500
From: slovenia
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the answer is in the post above  |
p900 lover
Joined: Jan 08, 2004
Posts: > 500
From: London
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oh i c
thanks a lot
one more thing how cums some devices hav a 100 meter bluetooth and others only have 10 meters? |
Residentevil
Joined: Feb 29, 2004
Posts: > 500
From: Raccoon City, USA
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Bluetooth is not defined by the frequency it transmits, but by the small transmit power 1mW. Hence the short range <10m. There are no other bluetooth devices with longer ranges. Bluetooth limits itself to 10m. That is one way to avoid interference with other devices, that use the same frequencies.
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bart
Joined: Feb 03, 2002
Posts: > 500
From: Flanders
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and depends on the bluetooth version and the type of device.
bluetooth type 1.1b is most common and is used in phones to get up to 10m. but some adapters can make it go up to 50m
the new type 1.2 will be the new best thing, it will be implaned in phones so it can go up to 100m (the first phone with this is the Z1010 but it can only go up to 20m to save energy).
a few years ago on cebit a company also showed that it could get bluetooth up as for as 1km! but thats more something for networks.
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AcerKev
Joined: Jul 23, 2003
Posts: 25
From: Nottingham UK
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JaymoFish
Quote:
| It does use the same frequency, 2.4ghz.
Most new cordless phones are 2.4ghz, so are 802.11g/b wireless networks. |
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Also Video / Audio senders and Microwaves use 2.4ghz...
The band is rather crowded... Especially akward in city centers as bluetooth (epecially on NK7650s) has a habit of wiping out WiFi  , rather annoying when 15 wi-fi networks try to share the 12 channels (of which only three could operate without overlapping)
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jplacson
Joined: Apr 21, 2002
Posts: > 500
From: Philippines
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Bluetooth was designed to be a SHORT-RANGE cable replacement... not wifi, not a cordless phone, not a walkie talkie.
There are newer BT devices that can supposedly hit 30m, but BOTH devices have to be BT Long-range devices.
To have a long range transmitter on a small device would eat up way too much power. As it is, BT drains phones almost 2x faster during a call made with a BT headset.
Another reason why BT was specifically designed to be short range is to minimize frequency crowding. If EVERYONE had a BT headset, and EVERYONE was making calls... you have any idea how garbled, and choppy the reception would be if your phone could pick up EVERY BT HEADSET within 150 feet?!?!? Security would be a major issue since now, someone could be snatching your BT transmissions from far, far away.
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Posted: 2004-05-02 17:35
