Good reply, You're correct about a modem being non-professional equipment, there are some excellent PN Scanner/Decoders used in these system - Rohde & Schwarz TSMW, TSMU, TMSL, however a modem is representative of a customers experience. SNR is not really used as Ec/No (Chip energy over noise) is more useful. The scanners mentioned supply a CINR figure - Carrier Interference Noise Ratio.
General testing is carried out with a user device modem/mobile and a Scanner as this is not controlled by network commands.
There are plenty of expensive software solutions for this that are used at a professional level (ROMES, NEMO TEMS etc). If you are after a free solution, the AT commands of most units Huewai, Option etc will give you network information, For example: Signal as RSSi. (look under 3GPP TS 27.007) AT+CSQ? gives a number 0 (-113dBm or Less) to 31 (-51dBm or greater)
Failing that a lot of the dashboards have open APIs (in the UK Vodafones dashboard gives you access to lots of information) Most of the Samsung mobiles have a diagnostic screen giving levels Scrambe Code and Cell IDs
I too have been testing WiMAX in the UK, for the most part its short comings are down to the high frequency (3.5GHz). With a Tx Power of 32dBm (about a 1W), its coverage is very small, but it is very easily contained. Remember with WiMAX you have a limitation of how many users can have the top speed throughput. If someone is on the outskirts of your coverage, the site has to 'give' you more resource, so this limits everyone else. The operators are NOT trying to make another cellular network, they will be trying to cover high density industrial units, offices etc However, the HSPA (at least in the UK) is being offered at 7.2Mbps down and 2.1Mbps up - (only in London at the moment)
A GSM phone with picocell inside the plane will be on its lowest power step and be transmitting 50mW. If the FAA allows mobile phones working via a sat link, then its probable that they will have a wireless LAN system as well. However the thought of people doing the 'I'm on a plane' conversation is not a nice one!
True to a certain extent, but most modern phones are Tri-band to cover European and American frequencies. What puzzles me most is that most mobiles cost 200+('bout $350) to manufacture. The networks normally give 'kick back' to mobile phone retailers, in the hope that the user decides to hold on for a couple of years. So wheres the step 3: profit?
I work for one of the networks in the UK and we have a lot of probs in London from people in tall buildings (Canary Wharf etc) Its not the lack of signal...its too many signals! The phone cannot decode information from the cells as it sees all the channels next to each other. The channels are spaced at 200KHz(GSM), If you can see two channels next to each other, you won't be able to decode due to adjacent channel interference. A GSM signal can carry as far as 35Km! (Double time slots) as used on oil rigs.
The networks solution to mobiles in planes is to install an indoor system that relays the signal up to a satellite. The phone see the indoor system as the dominant signal and registers on this. The base station then tells the phones to switch to their lowest power(a couple of mW).
That would be true for most pubs in the UK, but don't forget this is in London and every pub is full of braying wankers talking in their mobiles. This sort of thing is ideal for the 'Nathan Barleys' of London. Pubs are for chilling out/relaxing because the week has been shitty!
This sort of PC is the just the ticket for data collection, surveying and monitoring on the move. Your average laptop can be a real handfull if you have to climb up a radio mast!(I have climbed some big bastards with an old GRiD PC!) The bigger the PC the more its going to get bashed around on the move.
I used to wear leather but now prefer my kevlar and re-inforced nylon kit (which is a touch more expensive) it has the added bonus of being water proof..Ah the British summers! This kit saved me after a white van took me of my bike by doing a u turn without looking(numpty). I came out of it completely unharmed. The abrasive injuries did not happen as they were 'soaked' up by the kevlar. Its probably just a little better than leather.
A company in the UK has been developing a diesel bike. The company is called Hayes Diversified Technologies. They developed the bike for the US marines. At the present all bikes are petrol only,but the rest of the vehicles are diesel. The new bikes have a Kawasaki based engine and it does a 140mpg! According to HDS they can get 12% more power out of a litre of diesel than petrol.
The big companies who own 3G are at the moment selling features which are data and voice. This is to get people used to not just using the phone as a voice only device. As people get used to the features offered by GPRS and sending pictures, downloading games etc then they get their phone upgraded to 3G, they don't notice any new features except that it will all work so much faster. Then when more features become available the people will use them because they will be used to using the phone for something else.
If you did have a ratio of Chip energy to noise, that surely is the 'signal strength' indicator. If there were many mobiles trying to use the pilot channel the base station would decrease its power, to lessen the background noise. So your 'signal strength' indicator would go down? If you had a high Ec/Io then there isn't may people trying to use the site. So 'indicator'show more bars.
I am so glad to give my money to the big record companies, they give us so many quality boy and girl bands all with incredible singing and playing talent!
Its even more agreeable to buy a CD that costs more than in the US(Rip-off UK).
I just can't understand why napster,scour etc got so popular
Sarcastic bloke
Mmmm - interesting, but arse.
I'll do it in reverse order:
4. Thermal effect ARE the issue as they are the only known effect that has been proved. Other effects 'discovered' by professors whose grant is going to run out soon shouldn't be taken seriously. Remember - peer reviewed only( anyone remember cold fusion?)
3. They are everywhere as the companies are trying to cover everywhere. If you are under directly under the Base station antennas you will be getting the smallest signal as the power is reflected out of antennas
2. I was talking about television broadcast. You average Cellular basestation has a power of 300W ERP
1. Your right! But if your in line of site with a TV broadcasting tower (such as Crystal Palace in London) Then there are flats less that 200m away that are in the beamwidth of the antenna.
I haven't been programmed by PR monkeys. I measure the effects and perform checks on Base stations for a job. I have been doing it for 10 years, sometimes in RF fields a lot greater that Cellular base stations.
-like I said Relax!
Si
You need to relax....
The angle change on a mobile phone antenna is improve the reception in built up areas due to multi-path fading.
All mobile phones do is emit radio waves, If there was a problem with high power radio waves why aren't there loads of cancer ridded people around TV broadcasting towers which have an output of 1000000 Watts at a similar frequency to the phone(around 820MHz in UK). These towers have been around for at least 50 years. Your GSM mobile phone emits a tiny 1.25W. This is closer to your head but the the thermal effects are nothing( about 0.1 C)
People have been getting cancer for a long time when there was no phones, powerline etc
Slashdot Mirror
Good reply,
You're correct about a modem being non-professional equipment, there are some excellent PN Scanner/Decoders used in these system - Rohde & Schwarz TSMW, TSMU, TMSL, however a modem is representative of a customers experience.
SNR is not really used as Ec/No (Chip energy over noise) is more useful. The scanners mentioned supply a CINR figure - Carrier Interference Noise Ratio.
General testing is carried out with a user device modem/mobile and a Scanner as this is not controlled by network commands.
Si
There are plenty of expensive software solutions for this that are used at a professional level (ROMES, NEMO TEMS etc).
If you are after a free solution, the AT commands of most units Huewai, Option etc will give you network information,
For example: Signal as RSSi. (look under 3GPP TS 27.007) AT+CSQ? gives a number 0 (-113dBm or Less) to 31 (-51dBm or greater)
Failing that a lot of the dashboards have open APIs (in the UK Vodafones dashboard gives you access to lots of information)
Most of the Samsung mobiles have a diagnostic screen giving levels Scrambe Code and Cell IDs
For more info Siroda.co.uk or pm me
Si
I too have been testing WiMAX in the UK, for the most part its short comings are down to the high frequency (3.5GHz). With a Tx Power of 32dBm (about a 1W), its coverage is very small, but it is very easily contained.
Remember with WiMAX you have a limitation of how many users can have the top speed throughput. If someone is on the outskirts of your coverage, the site has to 'give' you more resource, so this limits everyone else.
The operators are NOT trying to make another cellular network, they will be trying to cover high density industrial units, offices etc
However, the HSPA (at least in the UK) is being offered at 7.2Mbps down and 2.1Mbps up - (only in London at the moment)
The mobile networks are disabled to public numbers, to prevent remote detonation. The networks are still running for the emergency services only.
A GSM phone with picocell inside the plane will be on its lowest power step and be transmitting 50mW.
If the FAA allows mobile phones working via a sat link, then its probable that they will have a wireless LAN system as well.
However the thought of people doing the 'I'm on a plane' conversation is not a nice one!
Bloody Hell, You must have a strong arm!
True to a certain extent, but most modern phones are Tri-band to cover European and American frequencies.
What puzzles me most is that most mobiles cost 200+('bout $350) to manufacture. The networks normally give 'kick back' to mobile phone retailers, in the hope that the user decides to hold on for a couple of years. So wheres the step 3: profit?
I work for one of the networks in the UK and we have a lot of probs in London from people in tall buildings (Canary Wharf etc) Its not the lack of signal...its too many signals! The phone cannot decode information from the cells as it sees all the channels next to each other. The channels are spaced at 200KHz(GSM), If you can see two channels next to each other, you won't be able to decode due to adjacent channel interference.
A GSM signal can carry as far as 35Km! (Double time slots) as used on oil rigs.
The networks solution to mobiles in planes is to install an indoor system that relays the signal up to a satellite. The phone see the indoor system as the dominant signal and registers on this. The base station then tells the phones to switch to their lowest power(a couple of mW).
That would be true for most pubs in the UK, but don't forget this is in London and every pub is full of braying wankers talking in their mobiles. This sort of thing is ideal for the 'Nathan Barleys' of London.
Pubs are for chilling out/relaxing because the week has been shitty!
When you go blind! - Now wheres that submit button?
This sort of PC is the just the ticket for data collection, surveying and monitoring on the move. Your average laptop can be a real handfull if you have to climb up a radio mast!(I have climbed some big bastards with an old GRiD PC!) The bigger the PC the more its going to get bashed around on the move.
Better find that wide angle lens!
I used to wear leather but now prefer my kevlar and re-inforced nylon kit (which is a touch more expensive) it has the added bonus of being water proof..Ah the British summers! This kit saved me after a white van took me of my bike by doing a u turn without looking(numpty). I came out of it completely unharmed. The abrasive injuries did not happen as they were 'soaked' up by the kevlar. Its probably just a little better than leather.
A company in the UK has been developing a diesel bike. The company is called Hayes Diversified Technologies. They developed the bike for the US marines. At the present all bikes are petrol only,but the rest of the vehicles are diesel. The new bikes have a Kawasaki based engine and it does a 140mpg! According to HDS they can get 12% more power out of a litre of diesel than petrol.
The big companies who own 3G are at the moment selling features which are data and voice. This is to get people used to not just using the phone as a voice only device. As people get used to the features offered by GPRS and sending pictures, downloading games etc then they get their phone upgraded to 3G, they don't notice any new features except that it will all work so much faster. Then when more features become available the people will use them because they will be used to using the phone for something else.
If you did have a ratio of Chip energy to noise, that surely is the 'signal strength' indicator. If there were many mobiles trying to use the pilot channel the base station would decrease its power, to lessen the background noise. So your 'signal strength' indicator would go down? If you had a high Ec/Io then there isn't may people trying to use the site. So 'indicator'show more bars.
You'll be amazed at the monsters I see after a bottle Scotch!
Mmm I can't remember my Grandfather saying anything about zombies in the war, must have slipped his mind....
Class. Pure Class! I wonder if its too late to ask for all my elastic bands back from the rocket motors
I am so glad to give my money to the big record companies, they give us so many quality boy and girl bands all with incredible singing and playing talent! Its even more agreeable to buy a CD that costs more than in the US(Rip-off UK). I just can't understand why napster,scour etc got so popular Sarcastic bloke
Mmmm - interesting, but arse. I'll do it in reverse order: 4. Thermal effect ARE the issue as they are the only known effect that has been proved. Other effects 'discovered' by professors whose grant is going to run out soon shouldn't be taken seriously. Remember - peer reviewed only( anyone remember cold fusion?) 3. They are everywhere as the companies are trying to cover everywhere. If you are under directly under the Base station antennas you will be getting the smallest signal as the power is reflected out of antennas 2. I was talking about television broadcast. You average Cellular basestation has a power of 300W ERP 1. Your right! But if your in line of site with a TV broadcasting tower (such as Crystal Palace in London) Then there are flats less that 200m away that are in the beamwidth of the antenna. I haven't been programmed by PR monkeys. I measure the effects and perform checks on Base stations for a job. I have been doing it for 10 years, sometimes in RF fields a lot greater that Cellular base stations. -like I said Relax! Si
You need to relax.... The angle change on a mobile phone antenna is improve the reception in built up areas due to multi-path fading. All mobile phones do is emit radio waves, If there was a problem with high power radio waves why aren't there loads of cancer ridded people around TV broadcasting towers which have an output of 1000000 Watts at a similar frequency to the phone(around 820MHz in UK). These towers have been around for at least 50 years. Your GSM mobile phone emits a tiny 1.25W. This is closer to your head but the the thermal effects are nothing( about 0.1 C) People have been getting cancer for a long time when there was no phones, powerline etc