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This might seem stupid. But i have always been intrigued by cell phone technology. And still i haven't a clue how these phones work! And why are they called CELL phones?
This message was posted from a T230
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Posted: 2004-10-07 00:40:38
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Ur the whizkid u shud no!
This message was posted from a T610
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Posted: 2004-10-07 01:02:23
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Next time I take a phone apart I'll take some pics and post them if you like!
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Posted: 2004-10-07 02:09:43
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Try dis
http://www.ieee-virtual-museu[....]ech.php?taid=&id=2345893&lid=1
Shud sort it out 4 U, gud bi of history as well....
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Posted: 2004-10-07 02:23:33
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A cell(cellular)phone is basically a transceiver(transmitter + receiver in one),that operates on microwave frequencys.voda and o2 operate on 900megs,which use cellular repeaters based in high altitude areas,whereas t mob,orange,etc,use sattelite(1.8gig)which is upper end of uhf,or really shf.phones work on duplex,where both parties can talk at once.Phones are a little like 2 way radios(but they re only simplex)with use of a hilltop repeater.
This message was posted from a T68i
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Posted: 2004-10-07 02:59:45
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K700nut went right.
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Posted: 2004-10-07 05:17:00
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It's a long story but to make it short, Cellular phones, like what @K700nut said, is a transceiver but with a low power compared to VHF or CB radios. What makes it portable and also why it's called so is the fact that it relies on repeater stations that called "Cell sites" to boost it's received and transmitted signal. Without these Cell sites your cellphone is just another piece of expensive toy.
check
HowStuffWorks for detailed info.
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resistance is futile.
[ This Message was edited by: blackspot on 2004-10-07 04:39 ]
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Posted: 2004-10-07 05:37:43
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I'm interested to know more about the differences between the 900 and 1800 Mhz frequencies - so from what k700nut has said, 900 Mhz operators (like O2 and Voda in the UK) can have less transmitters, but they can be larger, and the signal carries further, whilst 1800 Mhz operators (like Orange and T-Mobile) have to have more, lower-powered units dotted about as their signals don't travel as well? Is it a similar story for slightly different frequencies, like the 850Mhz and 1900Mhz that some countries use?
Does anyone have any more info on this?
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Posted: 2004-10-07 16:53:53
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Ok,the higher the frequency,the more directional the signal normally is,hence the reason parabolic antennas(sat dishes)are used for very directional transmission.also the higher the frequency,the more line of sight you need to be with the tx(transmitter),because objects,i.e trees,buildings,etc absorb lots of signal.a typical example of directional antennas on uhf(although not a parabolic antenna),would be a tv aerial(around 480mhz).anyway,i'm just waffling now.i could go on,and on,but i'd need paper.lol
This message was posted from a K700i
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Posted: 2004-10-07 17:15:23
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It's all about wavelength, higher freq (more GHz) means shorter wavelengths and therefore shorter aerials/masts.
This message was posted from a T610
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Posted: 2004-10-07 17:16:51
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