mobile phone masts
16 September 2002, 10:58 AM
#5
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while your waiting please take a look at http://www.portstor.co.uk
[Edited by dogmaul - 9/16/2002 10:59:06 AM]
[Edited by dogmaul - 9/16/2002 10:59:06 AM]
16 September 2002, 11:18 AM
#6
daz
I believe at up to 15 miles, depending on site. However, things like hills, buildings/towns, electricity pylons etc all interfere with the received/transmitted signal. In towns/cities, a cell is likely to be about 100m accross both to cope with buildings but also to cope with higher volume of traffic.
Much touted cell location services coming soon from the networks can only tie you down to the cell you're currently in. OK in town, but you could be a few streets away, but a nightmare in the country when you could be somewhere in 100 square miles!
I believe at up to 15 miles, depending on site. However, things like hills, buildings/towns, electricity pylons etc all interfere with the received/transmitted signal. In towns/cities, a cell is likely to be about 100m accross both to cope with buildings but also to cope with higher volume of traffic.
Much touted cell location services coming soon from the networks can only tie you down to the cell you're currently in. OK in town, but you could be a few streets away, but a nightmare in the country when you could be somewhere in 100 square miles!
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17 September 2002, 08:16 PM
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The signal radius isn't necessarily the same as the working radius!!
I went on the Heysham ferry to the Manx Birthday Bash, and at what must have been 25 miles from the UK coast i still had three bars of signal (on Orange). However, when i tried to send an SMS, everything suddenly dropped and i lost contact
I believe that the reason is that as the radio signals travel in straight lines, you can potentially receive them over quite long distances over the sea (or in the air). However, because GSM phones (both 900MHz and 1800MHz) "timeslice" each phone on a given frequency - the speed of light comes into play. If you are too far away, the time for each "packet" to reach the mast is too long (they can overlap with other packets) and thus things stop working.
Similarly, driving directly at a mast at 120mph (for 1800MHz) or 240mph
(for 900MHz) will confuse things somewhat!!
mb
I went on the Heysham ferry to the Manx Birthday Bash, and at what must have been 25 miles from the UK coast i still had three bars of signal (on Orange). However, when i tried to send an SMS, everything suddenly dropped and i lost contact
I believe that the reason is that as the radio signals travel in straight lines, you can potentially receive them over quite long distances over the sea (or in the air). However, because GSM phones (both 900MHz and 1800MHz) "timeslice" each phone on a given frequency - the speed of light comes into play. If you are too far away, the time for each "packet" to reach the mast is too long (they can overlap with other packets) and thus things stop working.
Similarly, driving directly at a mast at 120mph (for 1800MHz) or 240mph
(for 900MHz) will confuse things somewhat!!mb
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