3. Also, is the mini retractable whip antenna of this phone a "safer" antenna (antenna is not directly into the ear but a few cm away of the head)
Speaking from experience, placing a hand in front of a waveguide emitting less than 1mW at 10.5GHz is clearly noticeable although it's difficult to describe exactly what you can feel.
Yes, multi-band phones can switch band on-the-fly in the same way and maybe at the same time as they switch from one cell station mast to another without you noticing.
Brian.
This is omnidirectional. Modern phone antennas are specifically designed for low radiation to the user's head (keyword: SAR).
I just saw your reply. Are you sure that all phones comply with this or you just suspect it? It is hard to do this and at the same time try to achieve max signal reception based on the operator's position.
SAR tests are part of phone qualification, and there are certain limits enforced by law in Europe, US etc.
https://www.cnet.com/pictures/lowest-cell-phone-radiation/
I suspect these latest antennas are not isotropic, and like you say, sometimes they may radiate less towards the operator.
Near-field radiation pattern is not same as fare-field radiation pattern.An isotropic antenna a few cm away from the head, is worse or better than an embedded (PCB) antenna located directly after the ear?
Near-field radiation pattern is not same as fare-field radiation pattern.
Isotropic radiation pattern is an theoretical thing. it do not exist any real antenna with isotropic radiation pattern.
Main body heating effect due to use of a cellphone is caused by electronic internal heat losses and display background light, radiated RF is just a minor part. Even a completely dead phone causes measurable increased temperature when hold against an ear as else naturally dissipated heat from ear is blocked. Phone acts as an heat-isolating barrier between ear and free air. Same principle as for knitted ear warmers. As an ear at room temperature normally is emitting more heat then a standard cellphone emits, is ear by it self the main heat source in head region causing increased head temperature when holding a phone against ear.
Our main external radiations source is the Sun. Can add 1kW/m² radiation to your body a clear day and a bit less during nighttime, emitted by sun indirect heated sources. Due to sun primary and secondary radiation sources will it keep earth average temperature at an reasonable temperature range even at night and in sun-shadow. At moon is that effect much less, temperature difference between direct sunlight and shadow can be 300 degrees C at moon. Earth have also an internal heat-source, but heat due to sunlight is just as important to make earth having a habitable temperature.
Many unhealthy effects due to use of cellphone are known. Impacts becomes serious when combined with known possible deadly activities such as driving a car. If using a cellphone for an hour had been nearly as dangerous as driving a car for an minute had cellphones probably been total forbidden. 2016 was 2.000.000 people injured and 40.000 died in traffic accidents in US. Some of them while holding a cellphone, a behavior which is known to act as a multiplicand for risk of being involved in accidents.
Increased risk for cancer due to using a cellphone as a harmful radiation source is not existing as only non-ionizing radiations is emitted from the phone.
Such radiation does not cause cancer even from much stronger non-ionizing radiating sources such as a kitchen stove witch emit power in range 1-2 kW or a microwave oven ~1000 Watt. A typical cellphone can emit up to 10 Watt when all internal functions are active and display is fully lit. Heating and burn effect are of course possible from these sources but that is not related to cancer. Even hardly burnt people, due to house fire and similar, do not later show increased risk for cancer. Risk of permanent heating and burn wounds due to use of cellphone is negligible compared to many much more powerful heating sources we have in our daily surrounding.
Dangerous indirect exceptions exist, as exploding cellphone battery can cause body wounds, faulty cellphone chargers can cause electrocution or put houses on fire.
The Sun is a much needed heat source but is also partly emitting ionized radiation from UV range and higher frequencies, with energy levels high enough to move an electron to another energy level (=1eV), which is a minimum cell affection needed to cause a cell modification, which in rare cases develops to cancer.
Such ionized radiation hits constantly every second your body and at increased levels when travel by fly or x-raying or by just being outside in the sun, especially when ozone layer is thin. Such exposure is known to increase risk of cancer.
Cellphone transmitter RF radiation is too weak to be able to emit photons of similar energy levels as sun-rays and is also limited by using too low frequencies.
Practical limits gives that minimum needed frequency to create a photon with energy level 1eV is 240 THz which is in near infrared wavelength range.
Cellphone radiation is not strong enough to change energy level of an electron, its radiation only cause the electron to vibrate a bit faster (=heat).
Such heat do not care what frequency or modulation its origin had as a traveling photon not carries that information when it hits an electron cloud.
Too much use of cellphone can cause or increase social related illness and stress, which is a source to bad eating/sleeping/living habits which can increase risk of other types of sickness, heart diseases and similar which will shorten your life.
Best cure is to leave cellphone at home and take a walk in the sunshine. Avoid US roads.
That is what it is about. Nothing else.Most of the message relates to the thermal effects
Non thermal effect is an hoax and by definition no effect at all.but I consider more the non-thermal effects
Here is your "fact": Some researches says that after 20 years hard research without finding any significant statistical data, are now exceptional data finally found but it need a few years more of funding to be presented.the fact is that we do not know yet, because some researches say no worry and some others say to do so.
You is wrong. By microwave oven radiated energy is 100% absorbed as heat inside oven and partly outside due to minor leakage. That heat is then dissolving in surrounding mass until all mass have equal temperature.I disagree about the microwave oven due to the shielding,
As significant proof that brain-cancer was related to use of cellphone as that they all was wearing dark colored ties.Recently I read somewhere that quite a few politicians in US developed brain cancers and although they cannot relate it to the phone use direcly,
That is what it is about. Nothing else.
Non thermal effect is an hoax and by definition no effect at all.
Any produced work have thermal loss if it not is a perpetual machine.
"Non thermal effect" was invented by a Swedish researcher which found that the lower radiated energy level, the bigger was brain damage.
A conclusion must be that a cellphone is as most harmful when it is turned of.
Here is your "fact": Some researches says that after 20 years hard research without finding any significant statistical data, are now exceptional data finally found but it need a few years more of funding to be presented.
That is not likely to happen and they will regularly say same thing next 20 years, every time they need more founding.
National Research Council (NRC) spent more than three years reviewing more than 500 scientific studies that had been conducted over a 20-year period and found "no conclusive and consistent evidence" that electromagnetic fields harm humans.
You is wrong. By microwave oven radiated energy is 100% absorbed as heat inside oven and partly outside due to minor leakage. That heat is then dissolving in surrounding mass until all mass have equal temperature.
As significant proof that brain-cancer was related to use of cellphone as that they all was wearing dark colored ties.
Existing accepted white papers, including reports from alarm-researchers shows just because of its low significant findings that getting cancer due to use of cellphone is an infinite small risk compared to risk of being hurt in an car accident. For car-accidents is statistical data very reliable as it seldom is hard to judge if it really was the car accident that caused the actual wound and not due the use of dark ties.
Keep physics simple, be critical if a report tries to bend and modify thermodynamic laws to create BS. Non thermal, is just as much science as hysteria (a Greece invention). Hysteria was during late 1800 assumed to be due to that women had a weaker body and mind which was overwhelmed by modern technology, such as extreme fast moving vehicles. Traveling more then 30km/h was assumed to be above critical limit what their body could handle.
However did modern technology also create a cure with introduction of electric vibrators.
Every next future technology will be dangerous according to some researchers as it always have been.
During early 1900 was it said that a visible receiving broadcast radio antenna could be harmful if visible. In some countries was it a special tax for visible antennas.
I remember when color TV was new technology. It was then researchers that reported that color TV will make men infertile in opposite if they looked at older non color TV.
With introduction of GSM was it said that digital radiation was more dangerous then analog radiation. Later when these researchers did understand that it not existed "digital radiation", was the problem due to that the analog GSM radiation was pulsing in resonance with human body. Same problem when Tetra was introduced, it caused headache in great amount as it was resonant with brain waves.
DECT and WiFi have also been found to be special problematic.
A lot of people did became hypersensitive (all self-diagnosed EHS) against these radio-waves with a peak around 10 years ago. James Randi offered 1million dollar to anyone that could detect RF-radiation in a double blind-test. No one tried. Maybe due to that EHS people are wealthy and not need more money.
Many serious blind test was done to find out if anyone really was EHS sensitive. All tests was negative.
A try to summarize all current exiting research results was done by the Interphone report. Its conclusion:
Overall, no increase in risk of glioma or meningioma was observed with use of mobile phones. There were suggestions of an increased risk of glioma at the highest exposure levels, but biases and error prevent a causal interpretation. The possible effects of long-term heavy use of mobile phones require further investigation.
Last sentence about "in need of further investigations" is a must in all research reports. Funding for next report are always needed as researchers else will be unemployed.
Proof that power from cellphone emitted radiation can be used to popping popcorn. With 11 millions views must it be truth.
No. It was researchers that did found a non existing phenomena.Now you refer to resonance
Use Google, search for the terms DECT radiation health. You have already got some links from me.So DECT and Wifi Does impose a risk compared to digital GSM? I would like to know more info about it.
Mainly tax payers. Not hard to Google for where a researcher works. If an university or any government organization is it probably in the end paid by tax.who is funding them?
You must use some logic to evaluate the risks you take in your daily life.no matter if they have judged the car accidents as a higher risk.
Too many. None of them are suffering any real disease as else would they not be worried by a non existing problem.Oh, this pop-corn video is totally ridiculous, but do you know how many people will really believe this?
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