An issue not much spoken of around PDA enthusiasts is health.
after Menneisyys's most wonderful guide on how to switch between networks I would like to develop his idea in another direction which regards to your brain staying cool.
btw, here's a reference to Menneisyys's guide.
http://forum.xda-developers.com/showthread.php?t=345524
As cellular generations evolved we got the gift of fast transfer rates.
This of course, doesn't come for free, and the higher the transfer rate, the more our brain boils.. whether we're connected to the internet or not.
This is not ALWAYS true, but let's assume that the 1 in 30 cases state is negligible.
In most cases, when you're connected to the 2G network, your device will consume less battery power than when it's connected to the 3G network.
We can refer to 2G,2.5G,2.75G,3G,3.5G.. and so forth. the main issue is not the EXACT difference between these network types but how much does each of them effect your brain.
Our devices' batteries consume power. they also radiate Electromagnetic waves which, if were visible, would create a most complex web, preventing us from doing anything since we would not be able to see.
that wasn't true in the past. the amount of energy radiated was much much much lower.
When you're connected to the 2G network, for instance, your phone tries to retain a fluent connection between its receiver and the (usually) closest relay point. this requires power. this power is also reflected into your brain.. and while a small % of it is dissipated into the air, a lot of it creates unnatural (we'll leave it at that) heat in your brain. it's something like the heat emitted from laptops (which you should also keep a good distance from.. using coolers and stuff.. or you'll get all kinds of pains.. like i have right now typing this on my laptop).
Every provider plants relay points in different places.
though it's a common belief that those relays are not healthy for you and you'd want them as far away as possible.. i'd say you don't.
it's true that having a relay 15-25m away from your window isn't exactly a vladnik carnival but there's a certain distance from the relay in which your phone wouldn't work too hard to retain a signal, and the relay (edit: not the actual relay but the effects caused by having a close relay) won't keep your neurons busy until they burst. It is obviously impossible to individually control the distance.
As 2G and 3G have different requirements, they also have different power consumption. It doesn't require much more than common logic to understand that since 3G needs to transfer more data during a short period of time, it would use more resources than 2G, which needs less during the same period.
As an introduction to the concept of "power" i'll begin by saying that 2G requires something about 3-5 times less the power to keep a live connection than 3G does. as it's not completely true, it wouldn't be wrong to say that 3G creates about 3-5 times the heat than 2G does. a fireball to your brain.
Rough numbers are averaging from 0.043mW/kb in 2G to 0.23mW/kb in 3G.. while using EDGE for instance... is much closer to 2G than to 3G.
Power dissipates by 1/r^2, r being the distance, so i'd say it's certainly fitting to use a headset rather than talking straight to your device.
of course, the best thing to do is to use your speaker.
1. You will be wise using 2G only for phone calls and use your speaker as much as you can to keep yourself away from long lasting brain damage.
2. You will be wise to use NOT MORE than the EXACT data connection you need for your applications. (i.e. if EDGE is fast enough for you, DON'T use 3G)
3. Actually, you will be wise NEVER to use 3G... but that's a bit hard for people who download porn on their devices and want 1.8-14.2MBPS
4. Cancer isn't a joke. BELIEVE me..
5. Cancer isn't a joke.
I'll finish by helping you understand how bad the whole issue is.
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the power formula is P=I*V
in the 2G case, P=0.091*3.9=0.355W
in the 3G case, P=0.239*3.9=0.93W
the relative power is 0.93/0.355 = 2.62
this means that at my house, where there is almost maximum signal strength, 3G requires about 2.6 times the power 2G requires.
these are really rough numbers as the current also contains other factors... but you can see the general ratio.
now when the signal is low, 3G requires like 3-4 times more than required when there's a strong signal.. but 2G only requires like twice.. maybe less.. since it has a much lower transfer rate.
it is true that this is the power used and not the radiated power.. and it's true that there's distance between the battery and your brain.. but roughly..
3G is HORRIBLE. don't kill yourselves. use your phones. wisely.
- never use more than 2G unless required. 2G supplies EVERYTHING you need but video calls and internet services at the same quality.
- never use more than EDGE unless required. EDGE supplies about 300kbps which is good for surfing..
- never use 3G unless you really need a very fast connection.
you are invited to use the below tools to check how your phone acts.
Hope this helps you realize what's good for you.
EDIT: now just to clarify this issue so that i don't get clobbered, i am NOT refering to electromagnetic waves THEMSELVES (thus canceling the effect of distant electromagnetic radiation emitting devices). all i am refering to is the heat generated by your device. electromagnetic waves have yet to be proven harmful since their frequencies are too high to harm us(that's the current assumption). the heat generated by those waves tho, is known to "fry". that is, and as i mentioned before, like the heat generated from your laptop which causes inflammations.. and .. other things.
There IS a link between the electromagnetic radiation to the heat generated in our body as the higher the frequency, the higher the particle velocity, causing higher friction which causes heat. this effect is negligible when discussing distant electronic devices, since, as i said ealier, power dissipates by 1/r^2.
what i'm trying to say is, that whether it is proven you can be harmed from electromagnetic radiation and heat or not, we should just be cautious. just in case..
Well.... first of all I do not agree on all your points or think everything you say is as serious a factor as you describe it to be. However, I'll not 'bicker and argue' on these points, less radiation is always better, after all.
In fact, you just gave me an idea for an awesome new app, I may or may not write soon
The whole reason for my reply however is this simply tip that will make a lot of difference for a fair number of people, I'll bet:
Do NOT place the phone next to your head next to your bed when you go to sleep!
This was actually in the news here either past week or the week before that. Seeing as you'd be in that position for like 8 hours, you can see how it can make a difference
You are correct. this isn't as bad as i made it sound. but making something sound worse than it is always makes people take it more seriously.
I would say that the problem isn't really in the short run.
In the long run, it can be devastating.
and you're right. it's a good tip to not leave the phone close to your head while sleeping.
this actually creates unwanted brain activity. again, in the short run.. it doesn't really matter.. but having more current going thru your brain EVERY night.. will damage it.
and by all means.. argue. this is a forum after all
Surely it's your gonads that are in more peril from 3G as I don't surf/videocall with the phone against my head?
I guess yeah your gonads may be in trouble
Personally I don't even have phones in the same room as where I sleep, and whenever I'm not walking somewhere they aren't on me either. In the car they're either on the passengers seat or in the glove-box, and at home or work they are in their desktop cradles
Dont carry them on you unless you have to.
Interesting read...nir36!
One thing is for sure, numbers don't lie. As you know, my thread question whether 3G is worth it on a battery front, but more importantly on a health front.
It would be great to get an APP to allow Communication Manager to speak to the different Networks (2G, 2.75/Edge, 3G, 3.5G, etc.) in order to give back power to the people...instead of power going to their heads!
Yes, I know people use the internet away from their heads but most use the 3G network for phone calls. I don't......switch to Edge immediately.
As mention previously, it would be great to have a "Network Switcher" allowing users to make wise choices.
I leave my data connection running downloading stuff a lot of times when I am at work. I have found I can amp the juice down a LOT by turning on my speakers and listening to the crazy noise then moving the phone to a spot where the noise goes away or gets very quiet. For instance. On my desk they go crazy. If I put the phone on the window they go silent very where as moving it in the other direction the same distance does nothing. My conclusion? my head and the speakers which are only about 2 feet away from my head are getting much less radiation. Can do the same thing with my headset for a more accurate placement BUT for some reason it barely picks up the signal to begin with. Not to mention the cold metal window sill cools the phone! bit torrent gets the lil bugger warm.
hey and what if i disable GSM module for night? i use my pda also as alarm clock so is it also so dangerous when it is disabled but still near my head when i am sleeping?
kosmodisk said:
hey and what if i disable GSM module for night? i use my pda also as alarm clock so is it also so dangerous when it is disabled but still near my head when i am sleeping?
Click to expand...
Click to collapse
if Phone, Wifi, and Bluetooth are off in the wireless menu I cant see of any reason it would emit any radiation. Unless someone else knows something I don't.
Putting it in "flight mode" would indeed kill 99% of all radiation.
as Chainfire said.. it would kill about 99% of the radiation.. or even more.
radiation levels are caused mostly by the fact that you have an antenna fixed in your device which emits EM waves heretically while the phone is on. when the Bluetooth, Wireless and Phone are off... the device only runs on a few mA... while in sleep mode... so the heat levels are dissipated at about 0.05 (or so) cm from the battery. even if you put your phone right next to your ear while all comm services are off.. there's almost 0 chance that something would happen.
to answer your question... a pda in flight mode acting as an alarm clock can be placed next to you. still, just in case.. keep it 20cm from your head.
Wouldn't it be great if a manufactuer built a phone with a small parabolic reflector behind the antenna that very quickly rotated based on the direction of the tower. Increased battery life. Increased signal. Decreased radiation through your head. Sounds difficult at first but when you think about it, it would be pretty easy and cheap.
oic0 said:
Wouldn't it be great if a manufactuer built a phone with a small parabolic reflector behind the antenna that very quickly rotated based on the direction of the tower. Increased battery life. Increased signal. Decreased radiation through your head. Sounds difficult at first but when you think about it, it would be pretty easy and cheap.
Click to expand...
Click to collapse
great idea... but what would happen if the closest tower created a straight course between the middle of your brain and the device?
Just a bump (as people should read this topic!) and a good spot for some shameless plugging (spam police where art thou?):
Chainfire said:
In fact, you just gave me an idea for an awesome new app, I may or may not write soon
Click to expand...
Click to collapse
I did spend some time on cooking something up that will reduce power usage for GSM-based devices when you're not 'manually' using the data connection. Not nearly done yet, but I have to be off for the weekend so it'll be a bit longer too.
When it's done it will result in your brain (and gonads!) being cooked less, as well as longer battery life. So longer life for both you and your battery - you may place your bets on what it will be called now!
I think it will be called, "Chainfire's Gonad Savior"
Nope, wrong guess, and here it is (pre-alpha, proof of concept): http://forum.xda-developers.com/showthread.php?t=478519
@ nir36
Turn around?
crampedson said:
@ nir36
Turn around?
Click to expand...
Click to collapse
lol. good idea. if only we had x-ray vision
Given that the OP here mentions cancer and 'brain boiling' and all sorts of other horrific stuff but doesn't appear to have any real science backing these claims up, isn't this thread just rampant scare-mongering?
Its highly overstated to make a point. This just proves you didn't get that point
Besides, how radiation works and what it can do is widely known. If you have to provide scientific proof of every widely known thing whenver you talk about it ...
Related
Guys, this ain't an upgrade nor a hack issue. It is more important than all that. It is about health and how health friendly those devices are :!:
I have been hearing lots of issues about the radiation generated by either the GSM, BT or WiFi signals!
Is it true that it is not wise to carry the PPC next to the heart in the pocket or on the side pocket? Has there ever been an official report or research done on this and found it is not too friendly :?:
I know that this forum has got people from all over the globe. Therefore some of those countries might have researched and would have announced it, but mind you.. "Official Announcement
Please advise since it is a worry I've got :roll:
i've read more cases where study said that it was no problem that the other way around same thing with utms (3g)
but even if it were a problem that your hart would never be the troublesome place
your head and your testicles would be that place where it could cause issues
high watt transmision cause inc in celluar activities your hart is just a pump and need high volts expousre to react to anything like that
your brain are a pile of fat tissue where the neural transmitors and cemestry cause thinging and emotions celluar changing can be an issue there
and your semen aswell semen are preduced as a copy of the earlier produced so celluar changes which are high enough to mutate could be a problem
but cellphones are nowhere near as troublesome as highvolt lines and the wifi networks
only place you can 100% safe in in a big lead safe
Rudegar do you mean that GSM is more harmless than wifi? As far as I know the transmition power of GSM can go up as much as 2Watts in areas with low signal while wifi is only miliwatts!
wifi is always gsm is only when you make a call
i speak of wifi where you dont just use wifi at places where there are hotspots but you having a wifi network maybe some transcievers to str up the signal and such
and i also do believe that wifi is stronger then bluetooth which is just a few miliwatt dident check it though
Hello,
I'm no doctor but what I can tell you based on wireless emmissions is that if you use a bluetooth headset, and keep the device as far away from you as possible. The emmissions are reduced considerably.
A bluetooth headset has a range of 5 meters, whereas Wi-Fi or Cell Transmission are a hundred times that. Which makes me think that having a bluetooth headset near your ear, is a hundred times less strong than having a mobile phone, this gives me a peace of mind.
What is to keep in mind is that, especially during conversation. Not to leave the device inside your pocket plugged within your belt. This causes more problems as the testicles are more prone to damage than the brain is. Thus even when using the bluetooth headset. In effect its better to keep the device at a distance from your body.
Also note that using a mobile phone inside a car (especially new ones), is dangerous... Why? Because the car's shield acts as a mirror to the radio-waves. It reflects 10 to 20 times within the car, thus the radiation within the car is reflected and causing higher radiation within.. Solution? External antenna, I don`t have one, but when I use the mobile, I put it far away on the dashboard, close to the window to reflect the least radiation possible within the car. Please note that all PDA2Ks and PocketPC phones have a builtin slot to connect external antenna!
Well in fact you're right about the Lead Box.. But really, I believe that when I'm going to the beach, under the sun. Im not only getting a high dose of ultraviolet rays. Lieing down, my body is probably able to receive a 1200 channels from astra (some encrypted) and another 400 from Hotbird. Its also constantly receiving the Date and Time from GPS Satellites to calculate the location. On the other side when standing up, I'm probably getting 40 Terrestrial Channels and another 100 FM Channels. Apart from the Wi-Fi stations AND Cellular Antennas nearby.
the world is becoming clattered in radio communications. Its a must of our everyday life, the trick is to be aware of it and where possible to reduce it.
Small note about signal strenght :
The mobile's radio transmitting voltage is set according to the signal strenght.
In areas with low signal strenght, the voltage is incresed, thus increasing the radiation.
Regards,
Eman
Hello,
I'm no doctor but what I can tell you based on wireless emmissions is that if you use a bluetooth headset, and keep the device as far away from you as possible. The emmissions are reduced considerably.
A bluetooth headset has a range of 5 meters, whereas Wi-Fi or Cell Transmission are a hundred times that. Which makes me think that having a bluetooth headset near your ear, is a hundred times less strong than having a mobile phone, this gives me a peace of mind.
What is to keep in mind is that, especially during conversation. Not to leave the device inside your pocket plugged within your belt. This causes more problems as the testicles are more prone to damage than the brain is. Thus even when using the bluetooth headset. In effect its better to keep the device at a distance from your body.
Also note that using a mobile phone inside a car (especially new ones), is dangerous... Why? Because the car's shield acts as a mirror to the radio-waves. It reflects 10 to 20 times within the car, thus the radiation within the car is reflected and causing higher radiation within.. Solution? External antenna, I don`t have one, but when I use the mobile, I put it far away on the dashboard, close to the window to reflect the least radiation possible within the car. Please note that all PDA2Ks and PocketPC phones have a builtin slot to connect external antenna!
Well in fact you're right about the Lead Box.. But really, I believe that when I'm going to the beach, under the sun. Im not only getting a high dose of ultraviolet rays. Lieing down, my body is probably able to receive a 1200 channels from astra (some encrypted) and another 400 from Hotbird. Its also constantly receiving the Date and Time from GPS Satellites to calculate the location. On the other side when standing up, I'm probably getting 40 Terrestrial Channels and another 100 FM Channels. Apart from the Wi-Fi stations AND Cellular Antennas nearby.
the world is becoming clattered in radio communications. Its a must of our everyday life, the trick is to be aware of it and where possible to reduce it.
Small note about signal strenght :
The mobile's radio transmitting voltage is set according to the signal strenght.
In areas with low signal strenght, the voltage is incresed, thus increasing the radiation.
Regards,
Eman
Hello! I'm looking for a way to boost my signal. I've noticed that when I have under 3 bars (and even if it bounces up to 3 and back down) my battery drains quicker than it can charge. At work as long as I have 3+ it will charge faster but if I'm at a different spot and its under 3 it drains. Also, it heats up (usually hangs out around 98.6 degrees but sometimes it'll go 105+). My main reason for wanting a boost at home is because I tether to play games when my sisters hog the house connection. So I'm looking for a cheap way to boost my signal. Small repeater sort of thing or something. To my understanding the little spots under the cover allow you to plug in external antennas, so where can I find everything for that? (And yes I saw that people can't get signal back after)
THANK YOU
Mechachu said:
Hello! I'm looking for a way to boost my signal. I've noticed that when I have under 3 bars (and even if it bounces up to 3 and back down) my battery drains quicker than it can charge. At work as long as I have 3+ it will charge faster but if I'm at a different spot and its under 3 it drains. Also, it heats up (usually hangs out around 98.6 degrees but sometimes it'll go 105+). My main reason for wanting a boost at home is because I tether to play games when my sisters hog the house connection. So I'm looking for a cheap way to boost my signal. Small repeater sort of thing or something. To my understanding the little spots under the cover allow you to plug in external antennas, so where can I find everything for that? (And yes I saw that people can't get signal back after)
THANK YOU
Click to expand...
Click to collapse
We used to live in an AT&T dead spot (yeah, yeah, who doesn't?) and ended up putting a powered wireless repeater in the house with an external antenna on the roof. I believe the manufacturer was Digital Antenna. They're not cheap, but the wired versions (if you can live with that) are a bit cheaper.
As long as you have high speed internet at home get an Airave. It puts up a tower in your house and processes everything over your home internet connection. 5 bucks a month i believe.
http://support.sprint.com/support/device/Sprint/AIRAVE_by_Sprint-dvc1230001prd/?id16=airave
Problem solved.
I thought about airwave but people ten to not pay the internet from time to time xD and does the signal crap out if people use the internet? Its only a 768 connection (country ftl) and people tend to netflix and cam -_-
Mechachu said:
I thought about airwave but people ten to not pay the internet from time to time xD and does the signal crap out if people use the internet? Its only a 768 connection (country ftl) and people tend to netflix and cam -_-
Click to expand...
Click to collapse
The airrave uses your internet connection for 3G data and voice calls. If your internet is slow to begin with and ppl are hammering it all day long the airrave won't work well for you. Also, it doesn't hand calls off to the real cell network, so if you're on the phone and you leave your house the call will drop. If you have good signal outside and bad signal inside, one of those repeaters is the way to go - but it ain't cheap.
Dang ok. What about something like the Wilson Magnet Mount Cellular Antenna at Radioshack? (Its on the site. Id link it but you need 8+ posts >.<)
I'd just limit your sisters ip address/mac address with a QOS policy, so that she can't hog all the bandwidth. (would be done at your router)
I've heard and seen on this board some nasty results from connecting external antennas to the connection point behind the battery cover. Do a search in the forums to see, I can't remember exactly off the top of my head.
Ya I only saw a couple people mention problems and it seemed to be things that they had only heard
Whatever you do DO NOT CONNECT an EXTERNAL ANTENNA to the CONNECTION POINT.
So far, everyone on this forum who has tried so with a Galaxy S has ended up with some permanent baseband (or whatever is responsible for the gsm/cdma part) corruption. What ended up happening was that the internal antenna would turn off. In some cases it meant that they could only call with the external antenna plugged in, and in other cases is meant that neither the external or internal antenna would work. (note: This has happened only on captivate and vibrant so far, so I am not sure what will happen on CDMA but.... Better safe than sorry right!?).
oh and sorry for the large font.... It catches your eye... ~_~
krackers said:
Whatever you do DO NOT CONNECT an EXTERNAL ANTENNAto the CONNECTION POINT.
So far, everyone on this forum who has tried so with a Galaxy S has ended up with some permanent baseband (or whatever is responsible for the gsm/cdma part) corruption. What ended up happening was that the internal antenna would turn off. In some cases it meant that they could only call with the external antenna plugged in, and in other cases is meant that neither the external or internal antenna would work. (note: This has happened only on captivate and vibrant so far, so I am not sure what will happen on CDMA but.... Better safe than sorry right!?).
oh and sorry for the large font.... It catches your eye... ~_~
Click to expand...
Click to collapse
lol I did that when i got my first smart phone, the htc touch. Thankfully back in those days sprint would fix any problem or give you a new phone no questions asked for 55 dollars. ( I used to find inventive ways to break my phone. Like the mentioned external antenna, or a homemade battery back)
I'm interested in a solution to this as well, preferably something that doesnt have a monthly fee attached.
In my basement, I get about 1-2 bars of service, and sometimes nothing at all. Is very frustrating to receive texts up to an hour late.
talk about ad placement
This came up right under the latest post in this thread:
Tri Band Yagi 700Mhz - 2500Mhz 9dBi
Our highest gain directional tri/multi antenna - for 700-2500mhz networks (including Verizon LTE, Sprint/Verizon/AT&T/Alltel 3G, and more).
LINK
Click to expand...
Click to collapse
Thank jebus for adfree android and adblockplus for firefox...
Sent from my SPH-D700 using XDA App
Hi all, please welcome me whom had bought the Optimus 3d just 2 days ago. I love this phone. Please do let me welcome you all to talk about a flaw, which I've found out right away with the new phone since 2 days ago! I've been with some others Android phones, so, I should say I've had good experience with Androids.
I realized that Optimus 3D has some kinda hardware Radio receiver flaw (I really don't know what should I really call it) similar to the famous iPhone 4 dilemma in the beginning. I found out that the "Radio receiver" is located somewhere at the bottom of the phone, where our hands most often holding the phone with. The hand will block out the signals and the signal bar will be reduced by a lot as much as to zero (if the signal strength itself is not strong in the 1st place!) Try find this yourself, have some experience by holding the phone at the bottom and let go and holding the phone and again let go, keep trying this you should see the signal strength that will drop and rise and drop and rise again. Or is this only my phone? But I've never experience this phenomenal with other Android phones!
Also, I don't know this has the directly link to the downloading issue or whenever browsing nets, the network data will drop very very often. I hardly got successful downloads from the market without few retries. Thank god at least at the moment I can temporarily fix it by turning off and on again with the data enabling shortcut in the pull down menu.
Please help me here and advice! Very much appreciated!
Since the famous iPhone 4 drama for a lot of phones these stories pop up once in a while. I know lots of people furiously believed the Samsung Galaxy S had the exact same problem but after a week or so nobody ever talked about it anymore.
I myself have absolutely no problem whatsoever with the signal, not even when I completely cover the entire phone with my hands leaving just a small spot to read the signal it never drops, not by one bar. I've never had a single download dropped with either 3G or wifi and I've downloaded my share of stuff from the market and other places.
I've tested this with my T-Mobile simcard (which has pretty horrible coverage here) and with my Vodafone simcard (which has great reception) and with both simcards the signal strength stays exactly the same according to the bars. Even when I go to the settings the dBm and asu values stay exactly the same, no matter how long and how bad I cover the phone.
So far you're the first and only person I've read about having these issues so I think it just could be an isolated incident, although that would be bad for you as that would mean you could have a defective phone
This problem is not something new and is not related with O3D.
All the phones have the same issue.
It is normal that if put your hand on the antenna the reception will drop.
The radio waves just work like this.
However the atenuation from your hand is most accentuated on higher frequencies like 2100Mhz.
On every phone even on the oldest phone with external antenna you will meet this phenomenon.
The difference between 4 bars and 1 bar is only around 10dBm which really isnt that massive a drop at all. Now that you've pointed this out i do see that the signal strength varies a little depending on how you hold the phone but its not enough to panic about i don't think. The iphone 4 problem was significantly greater in that the iss was that a user's hand would electeically short the mobile network antenna to the bluetooth and wifi antenna causing a total loss of signal. While 10dBm or so is a definite dip in signal strength, it's an acceptable level of attenuation and i dont see it causing any real world day to day network problems that you wouldn't experience with any other high end smartphone.
My workplace is in a giant tin hut of an industrial unit (read: faraday cage) and today while i had this phone there for the first time i saw no noticeable network coverage problems. The behaviour was as far as i can tell exactly tue same as my motorola milestone from which i upgraded.
Sent from my LG-P920 using XDA Premium App
As stated all phones can lose a bit of the reception when it's in your hand depending on how you hold it, the reason Iphone4 was such a big deal was that it was extremly sensitive when it came to left-handed people and they had a real problem with their antenna being totally blocked when holding the phone normally when speaking in it.
Later on media and uninformed people started fueling the flames as soon as they saw a bar drop when picking up the phone, radio waves are not magical rays or tachyons that can move though matter without interacting with it.
thanks for all the replies. Believe me or not, this is the 1st phone I realize this issue and it is so obvious, the bad news is, it is really bad for me that the antenna is located at the bottom, probably most others phones I've owned were at the top as a result i didn't got any problem before.
And another issue, I'm pretty stucked with the shipped rom now, really hope to see custom roms soon. I'm at the moment totally freak out with the inconsistent of data and the wifi, it keeps failing me, this really freak me off, what the hell is happening to me with this phone! I've never ever got any dropped data or wifi connections before. Arggghhhh!!!!!!!!!!!
I have no signal drop out no matter what hand positioning i use..
I'm in a very poor reception area. I do notice hand over phone a drop from 1 bar to none. Still not a red cross to indicate no signal but a drop of 1 bar all the same.
Just tested it.
Signal drops from 4 bars to 3 (1-2 in awkward positions) when hand-held. Not an real-life-usage impact though...
Thanks for all the test replies to support my findings. OK, now, I've realized that the hand holding issue has no direct impact to data drops. And the data drop is entirely due to the time issue which it does not lock down the data connection when swithcing data modes. And at the moment it can beasily over come to turn off with the data button in the pull down menu. I'm not sure though when in the situation when the signal strenght was so low, by holding with hands will give an direct effect of data drop or not. Will observe that
I was thinking about this for android since it's an open system but it probably applies to any phone once you XDA guys get them.
The idea is that since there is a Cell Phone radio in the phone, and there is a possibility to gain access to that radio is it possible to create a DOS attack in an area using just a normal cellphone? Imagine having an app to effectively block communications for what would probably be a very small area to keep it going long enough.
Does phone hardware even have the capabilities to do this?
Hypothetically, it should be possible, though I'm unsure of the level of access to the radios themselves in any phones...If you can get the radio to output noise on all frequencies constantly, with enough output, you should be able to jam a small area. However, the biggest issue (after gaining access to the radio chipset at the lowest level) would be pumping out enough power across the different channels to degrade others' reception.
You could probably get away with pumping out noise in intervals (extending battery life from your handset) and still degrade a signal enough to disrupt communications.
However, encrypted signals may be able to overcome brute-force jamming to a certain extent...I'm not sure if cellphones use spread-spectrum or frequency hopping, but if they do, there's another issue to overcome.
Keep in mind, if anyone clues in to the jamming, law enforcement radio direction-finding equipment will pinpoint the jamming headset pretty quickly, since you need to output a more powerful signal for your jamming to be effective.
cell phone jammers are also highly illegal.
It was a thought that came to my mind and I understand they're very illegal but I was wondering. Mostly for the capabilities of our phones, mostly the android ones.
I think it's a pretty interesting topic. Not sure I've ever heard anyone think of this one before on the forums (I don't post a lot but I read a lot)
only government officials can use cell jammers in case of bomb threats and stuff like that
You can buy jammers online if you know where to look for peanuts. Outside the USA some places have been using them as casually as in theaters. I also heard similar reports in hopitals but that surely has to be rumour mill since the whole point of no phones there is to reduce electromagetic interference messing with equipment like in planes so why would you spam with even more? (I think jammers DDOS the airwaves rather than anything much intelligent?).
The modem section of android has AFAIK always been closed source. This put a spanner in the works for things like the Replicant project which was trying to build a truely transparent phone open source so that you always know what is going on and have some privacy. The furthest they got was pretty much everything apart from the modem open source and that modem was able to spy on everything else.
Basically the network owners want a tight rein on what's connecting to their networks and the spectrum licensees want control of the spectrum. This is something both have at the moment legally...
but what with software defined radio like GNU Radio is pretty impossible to enforce and the only thing delaying this change is the economics of software defined radio and it's size. I expect this will change over time and that could be another very disruptive and interesting technology. As such I expect it'll try to be repressed making the problem worse.
That said, there are plenty of modems now for Arduino like projects and I'd expect just one of these to be open source?
Hope this helps clear it up for you
-j
This isn't the type of discussion that XDA encourages, especially not a discussion that's over a year old. Thread closed.
Hello,
Flying from London to Baltimore in a couple of weeks and looking forward to some quality gaming time with my xoom . Wanting to use my ps3 pad with sixaxis app but unsure what rules are regarding bluetooth during a flight. Had a google search and read mixed reports on using bluetooth. Any advice?
Just use it nothing is going to happen its all bull**** the plane is gonna have interference or and all have a safe journey mate cheers
Sent from my Xoom using Tapatalk
To be honest, radio frequencies do not interfere with aviation equipment outside of their operational range. It is the same concept as your phone, do you randomly pick up another persons call while you are talking on the phone.
We are bombarded with astronomical amounts of radio frequencies every day, the only thing that changes is how strong each one is. Phones, bluetooth, these devices can not physically put out enough power through their radios to cause a problem. Besides, bluetooth signals start to drop off by 20ft out usually, and most of the time cut out by 30. Bluetooth, and NFC are the weakest everyday radios in mass use.
I say go for it, and if they bring it up, just put it away, or argue that its infrared. That one has saved me once before.
Most airline policies say no to BT. In reality, that's silly. Many airlines now sell WiFi on some flights - and that's far stronger than BT.
I seem to recall seeing an FCC stamp on... oh, pretty much everything I own. Something about the device being tested not to cause any unwanted interference. Could just be my imagination, though.
Silly airlines.
Mythbuster actually did an episode on this topic and did find that Cell Signals can affect navigation but I forget what the power level was that made it happen.
BT should not be a problem with it's limited range and low power, and the truth is they only really care about it on Takeoff and landing where the instruments are the most important to the operation.