Ummm, No DBLTs so therefore your opinion of this amp is invalid ?.
Simple measurement of THD of 0.025% might be considered inaudible.
http://www.gedlee.com/downloads/THD_.pdf and others argue differently.
Dan.
Absolutely nothing. There is power control in the network that would turn them down. The network is designed for a particular class of mobile to get a balanced link.
Even if it did less heating effect than you doing a workout, and your brain seems to have coped with exercise over the years?
Despite 900MHz having twice the power and vastly improved propagation? Does he advocate tin foil hats as well? Really the metadata at the moment shows nothing to worry about. compared with, say, the dangers of petrol. Now that is evil stuff.
The intermod is higher than the amps I have in house, though interestingly, on the 11-12, it manifests as sidebands rather than a first order peak at 1k.
What does source impedance look like?
OMG(andhi)
Stuff as welding fumes is also class 2B, such a page may be more interesting for trailerpark car demolition folks with infants on cell call 24/7.
(in the ionizing radiation business, limited exposure regulations for kids go to age 18)
Kids don't ever call, they app.
Why must it have anything to do with heating? The problems occur at too low levels for heating to be a direct explanation.
Stop Shooting The Messenger....
His point was that yes, 900Mhz does have better propagation so the typical powers are rather lower than 1800MHz operation.
I do notice effects after an extended conversation with the phone against my ear, so I am wary and typically (99%) run loudspeaking mode.
I also keep my phone well away from my body and never in my pocket...I am not alarmist but I have always done this, and long before knowledge of any public concern re possible mobile phone health effects.
Dan.
Bill, I don't have the answers, I am just relaying thoughts of a very experienced and now retired transmitter tech.
His point was that yes, 900Mhz does have better propagation so the typical powers are rather lower than 1800MHz operation.
I do notice effects after an extended conversation with the phone against my ear, so I am wary and typically (99%) run loudspeaking mode.
I also keep my phone well away from my body and never in my pocket...I am not alarmist but I have always done this, and long before knowledge of any public concern re possible mobile phone health effects.
Dan.
Just as with a land-line connection.
Speak about subjectivity.
(merely holding a phone to your head for half an hour will heat up that side)
Wikipedia says Coffee, pickled vegetables also as class 2b carcinogen. There are few videos of Cellphone radiation measurements on YouTube. Measurements. Question is would short time exposure for few years would have same effect as long duration exposure in a few days.
An externally hosted image should be here but it was not working when we last tested it.
Regards.
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Ionizing radiation both memory stacks, and depends on instantaneous level.
Enough at once results to cancer, way over 10mSv* (1000 mrem) average in a life time may sooner or later kill the critter.
(I worked in a 50mSv/year max level environment for years, had to take a leave of work once due to crossing the badge)
What you're saying is whether it is better to heat up food au bain marie for half an hour, or use a flame torch for 5 minutes.
In the early 90s, I used a mobile car kit (Nokia package at a few grand).
Brick of a cell phone, with a pull-out sim card. The actual car phone was installed in the trunk, with a slot in which to slide the sim card.
The phone handle next to the steering wheel was as large as an oldfashioned land line telephone, including the spiral cable.
(real nuisance, the insurance company demanded that the phone handle and sim card to be removed when parking the car. Walking in a shop/supermarket with a car phone handle was the equivalent of having no pants on)
15 minutes of talking on the phone in the car turned one side of a head overheated, and eardrums numb.
Nowadays, half the folks in a supermarket either talk to themselves or non-stop in a bluetooth thingy.
Kids only use earpieces and headsets.
Me, I was already fed up with obligatory pagers. I carry a dumb-phone, my fingers can't handle sms buttons, and I refuse to talk longer than a minute on a cell phone. Don't call me, I won't call you either.
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All this talk of radiation from your phone and brain damage and heating of your head sounds so much like subjective audio evidence like IC's all sound bad. I just have a hard time believing any of this. I live directly under a high powered FM radio station antennae tower that is loaded with microwave antennae and cell repeaters and I have lived under this for on and off about 40 years now. I have not heard of there being a high cancer rate in this area or that there is any effect except for the interference with cell phone connections and bleeding into other audio equipment. Where is the evidence that all these people who are actually on their cell phones constantly wherever they go are having higher instances of brain or other cancers? I for one find this all silly talk from so many who are supposedly knowledgeable in electronics and use scientific methods to understand real cause and effect. I myself barely use my cell phone, I just don't talk on the phone much but I have it near me most of the time, so it is constantly transmitting to connect to a cell tower, they are always on, not just when we are talking on them. What I am hearing here is just simple FUD, not a single proof has been shown that any of this is real. This is not the same as putting your head in your microwave oven, someone show me some scientific evidence of any of this damage you are talking about, and not some subjective opinions, but real proof of real measurable damage caused by simple radio waves in transmitted radio spectrum and not the damage caused by microwave transmission at high levels. Just keep your head out of your microwave, and don't put the cat in there, not the same as talking on your phone.
ps. I have been using a mobile phone since 1971 when it was a huge Motorola unit mounted in the trunk of the car and a phone on the console that was the same size as a standard land line phone. You had to ask an operator to connect you to a number, there was no direct dialing on those phones and no real privacy as you could listen to others on their phone calls, wasn't very nice but was like an old community phone party line. So I just don't believe any of this fear and uncertainty about using a wireless phone transmitter any more than all those CB radios that people had in their cars years ago or ham radio operators with large antennae on top of their homes.
ps. I have been using a mobile phone since 1971 when it was a huge Motorola unit mounted in the trunk of the car and a phone on the console that was the same size as a standard land line phone. You had to ask an operator to connect you to a number, there was no direct dialing on those phones and no real privacy as you could listen to others on their phone calls, wasn't very nice but was like an old community phone party line. So I just don't believe any of this fear and uncertainty about using a wireless phone transmitter any more than all those CB radios that people had in their cars years ago or ham radio operators with large antennae on top of their homes.
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Well, the cell phone industry would never survive with users like myself. I average to one cell phone conversation od less than 1 minute once in every 2.4 days, or approximetaly 1 text message per day (excluding unsolicited phone text ads). I change my cell phone once every 10 years and am generally not really interested in them other than as an occasional convenience.
https://www.theguardian.com/science...snt-make-you-ill-or-give-you-cancer-heres-why
Of course, if you think the earth is flat, evolution is bs or we are not responsible for GW, then just skip the article.
The real risks for brain tumors are smoking and heavy drinking and not as a result of talking bs on a mobile phone for an hour a day.
Of course, if you think the earth is flat, evolution is bs or we are not responsible for GW, then just skip the article.
The real risks for brain tumors are smoking and heavy drinking and not as a result of talking bs on a mobile phone for an hour a day.
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Stephen--you're not going to find those studies. Not only is the epidemiology not there, but prior plausibility tells us that any effect is going to be small, making it very hard to pull out of the background.
Yes, you do heat up the inside of your brain with your cell phone, but the e = h*v tells us that the energy of any one photon in RF is low, far below a level to break/make bonds. That unto itself isn't a smoking gun, as localized heating can/will affect the local reaction kinetics and can force things a *little* off kilter*. The most concerning thing would be if the RF coming off your phone was tightly focused, as the broader and lower level the effect puts less stress on any one point in the brain, keeping it well within the regions of homeostasis. In engineer speak that many here might better understand, it's like pulling a -160 dBv signal out of a -40 dBv noise floor. Biology is messy business, and we've obviously evolved with evolutionary pressure from that big, hot orb in the sky, which enjoys pumping all kinds of EMR our way (much of the scary stuff absorbed well before hitting sea level).
* read up on UVa-skin cancer mechanisms, which are *far* more direct and push things a *lot* off kilter, if this is a bit confusing: https://en.wikipedia.org/wiki/Ultraviolet#Skin_damage
Edit to add: Bonsai--thanks for that article. Explains it in better layman's terms than I did.
Yes, you do heat up the inside of your brain with your cell phone, but the e = h*v tells us that the energy of any one photon in RF is low, far below a level to break/make bonds. That unto itself isn't a smoking gun, as localized heating can/will affect the local reaction kinetics and can force things a *little* off kilter*. The most concerning thing would be if the RF coming off your phone was tightly focused, as the broader and lower level the effect puts less stress on any one point in the brain, keeping it well within the regions of homeostasis. In engineer speak that many here might better understand, it's like pulling a -160 dBv signal out of a -40 dBv noise floor. Biology is messy business, and we've obviously evolved with evolutionary pressure from that big, hot orb in the sky, which enjoys pumping all kinds of EMR our way (much of the scary stuff absorbed well before hitting sea level).
* read up on UVa-skin cancer mechanisms, which are *far* more direct and push things a *lot* off kilter, if this is a bit confusing: https://en.wikipedia.org/wiki/Ultraviolet#Skin_damage
Edit to add: Bonsai--thanks for that article. Explains it in better layman's terms than I did.
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Yes, no scientific studies correlating cell phones and cancer. The people working day and night in the control towers at an airport must be exposed to much higher incidence of energy from the radar arrays and we don't hear about a cancer cluster from those workers. I'll worry about skin cancer from the sun before I worry about my cell phone. Even staying out of the sun constantly is more of a concern with the lack of vitamin D production from needed exposure to some sun light.
Even if a cell phone would heat up part of one's brain a few degrees, a simple flu can bump up cerebral temperature by close to 10.
I've evaporated more cells with barrels of hard liquor.
I think the proverbial jury is still out on cell and cordless phone effects. There are so many vested interests that I doubt both the proponents and the doubters. One thing certain is that it is not ionizing radiation involved, anymore than it was a consideration for setting limits on microwaves, the latter based on tissue heating.
In the meantime the biggest danger of cellphones is irresponsible use as a distraction.
I finally got a cheap dumb cell because I had to visit a client at some appreciable distance and wanted to drive there. I think I've logged about five minutes of use so far.
In the meantime the biggest danger of cellphones is irresponsible use as a distraction.
I finally got a cheap dumb cell because I had to visit a client at some appreciable distance and wanted to drive there. I think I've logged about five minutes of use so far.
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