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Cool.
This message was posted from a K500
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Posted: 2005-01-22 00:14:33
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@ Boba:
With sat fones, they work with frequencies in the upper Giga Hertz range (eg. 22GHz and higher) so with the same principle as the 1800MHz (which is actually 1.8GHz) the higher frequency is susceptible to moisture absorption as well.
However, add to that the interference from the ionosphere, the stratosphere and the
steel in structures around us, the signal received from a satellite is subject to a tremendous amount of intereference.
The biggest enemy of a satellite is the sun, since the radiation from the sun outstrips a satellite.
Note: the power level @ which the satellite transmits is very high, you could fry an egg in its shell in a matter of nano-seconds!
With that in mind, when a sat-fone receives a signal it does some processing before it can be made useful.
By this i mean, all the noise (interference) is extracted using a LNF (Low Noise Filter) and then amplified for use using a LNA (Low Noise Amplifier).
Similar signal processing occurs when the signal is bounced back to the satellite.
Atmospehric conditions have a big effect on high frequencies, together with steel structures (they have their own resonant frequency) thus signal is either degraded or sometimes lost.
If you go into a basement of a building (that has no dedicated antenna installed for GSM reception) you will lose the signal altogether, due the steel structure.
In addition, since sat-fones work on a line of sight principle, no signal will be received in a basement or house without an external antenna connected to the phone via a cable (much like your digital satellite tv).
I hope this answers your questions. Just shout if have more!
E&OE
(If i made any mistakes, please forgive me!)
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Posted: 2005-01-22 01:06:34
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Oh and to answer the question on quality of networks, the link i provided @ the beginning of the thread has coverage maps that indicate the quality of coverage for a network.
And so far from my experience the networks that use Ericsson /// ( i know Boba will like this comment
!!) network equipment provide the best quality. However, the network planners also determine how good a network is by erecting base stations @ correct locations.
Phew! All this reminds me of my studies!
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Sony Ericsson - the marriage of the consumer electronics Beauty to the telecomms Beast
[ This Message was edited by: HyperiaBlue on 2005-01-22 00:14 ]
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Posted: 2005-01-22 01:12:58
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@hyperia thx. did u ever gave a try to a sat fone ( maybe an /// r290 ) ?
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Posted: 2005-01-22 13:17:57
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Unfortunately i have not personally used a sat phone, however i have seen one. It was a bulky beast.
Have you used one Boba?
btw Boba i am an /// fan of note. I refuse to use anything other than ///.
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Posted: 2005-01-23 02:24:00
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well, i palyed with it, but didnt make any calls.
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Posted: 2005-01-23 12:47:07
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