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Originally posted by abecedarian
Do not forget two items:
1. RF exposure is cumulative. You can light a fluorescent lamp when standing directly under high-tension lines @ lowly 60Hz. There is A LOT of RF flowing through our noggins 7x24 which leads to point 2
2. Spread spectrum doesn't mean anything from a biological stance. RF is RF, whether it's spread over a few megahertz or on a single carrier frequency. Biologic tissue is not selective; no filtering takes place. In fact, the closer we come to microwaves the more we need to worry about molecular resonance in the opposite direction from a tuned circuit. At resonance, for example your microwave oven's 2.4GHz klystron variant, water molecules resonate and absorb an awful lot of the RF flowing through it.
Your WiFi, cordless phone, cell phones, and those Bluetooth devices glued to your ear also operate in the vicinity of 2.4GHz.
Ever cook an egg? You can cook it on a hot pavement if you're willing to wait a little while. You don't need a "burning hot" oven surface at all. Simply energy and time.
With regards to the cell phone causes cancer argument....
I have participated in EME surveys and we have found evidence that the EME field within 100' of overhead distribution power lines can well exceed 100% of the recommended continuous exposure limit, and was correlated to the line voltage; the same distance from a typical cell tower was around 25% and a cell phone in use barely registered 1% on our equipment.
So the argument that being 40 meters from power lines versus holding the cell phone against the head is a good comparison because the distance negates the difference in field strength is completely meaningless since as I mentioned above the field around the over head lines at 100 feet (approximately 30 meters) is still several orders of magnitude stronger than the field around the cell phone.
Additionally, most cellphones in use today operate on a CDMA type air-interface, a.k.a. "spread spectrum" (- yes 3G / UMTS, etc. have roots in CDMA), and in doing so have rather low power outputs as their signals are spread across mulitple frequencies and are typically only as strong as necessary to get above the background noise. Older phones operating on AMPS or TDMA broadcast around one channel and by necessity at higher power.
Originally posted by Death_Kron
Originally posted by sciemus
Originally posted by unityemissions
reply to post by sciemus
You don't seem to be thinking straight. Of course everything emits Em radiation. That's not the issue. The issue is that we're holding this device directly to our head. Did you not read the article I provided? It provided many links with numerous sources showing that cell phones cause brain tumors, damage dna, and screw up the blood brain barrier. If you don't think this is cause for concern, you might want to reconsider your logic.
So you seem to understand the basic concept that the power of an electromagnetic field declines as you move further away from it...
The concept your describing is called attenuation.
I don't have any medical or scientific knowledge regarding the harmful effects of using mobile phones but as you mentioned there are far more powerful radio waves floating around the atmosphere which no one seems to attribute to health damage.
Originally posted by Death_Kron
Maybe the following might be of use when talking about the medical effects of an RM signal:
"Attenuation coefficient
Attenuation coefficients are used to quantify different media according to how strongly the transmitted ultrasound amplitude decreases as a function of frequency. The attenuation coefficient (α) can be used to determine total attenuation in dB in the medium using the following formula:
As this equation shows, besides the medium length and attenuation coefficient, attenuation is also linearly dependent on the frequency of the incident ultrasound beam. Attenuation coefficients vary widely for different media. In biomedical ultrasound imaging however, biological materials and water are the most commonly used media. The attenuation coefficients of common biological materials at a frequency of 1 MHz are listed below:[2]
Material α(dB / (MHz * cm))
Lung 41
Bone 20
Kidney 1.0
Liver 0.94
Brain 0.85
Fat 0.63
Blood 0.18
Water 0.23222
"
Source: en.wikipedia.org...
If the 'RF is cumulative' thing you mention is true then I should be able to boil a cup of water using 18 ten second exposures spread over a period of an hour instead of one 3 minute burst.
Originally posted by joeofthemountain
Do not forget two items:
1. RF exposure is cumulative. You can light a fluorescent lamp when standing directly under high-tension lines @ lowly 60Hz. There is A LOT of RF flowing through our noggins 7x24 which leads to point 2
2. Spread spectrum doesn't mean anything from a biological stance. RF is RF, whether it's spread over a few megahertz or on a single carrier frequency. Biologic tissue is not selective; no filtering takes place. In fact, the closer we come to microwaves the more we need to worry about molecular resonance in the opposite direction from a tuned circuit. At resonance, for example your microwave oven's 2.4GHz klystron variant, water molecules resonate and absorb an awful lot of the RF flowing through it.
Your WiFi, cordless phone, cell phones, and those Bluetooth devices glued to your ear also operate in the vicinity of 2.4GHz.
Ever cook an egg? You can cook it on a hot pavement if you're willing to wait a little while. You don't need a "burning hot" oven surface at all. Simply energy and time.
The audio quality is abysmal - barely communications grade.
The form factors are "anti-ergonomic" and exasperate RPS problems in my wrists caused by a lifetime of PC usage (I'm not alone in this - most PC users will get it after they ruin the linings of the nerves in their arms)
As the PE points out, landlines run on 70V from the local exchange and do not depend on 120V from the power company.
Cell towers have battery backups that will die in a matter of hours without the mains
Cell is radio and the usage is constrained by an economic model that assuems time-sharing of call patterns. IOW - cell phone networks collapse under heavy use as in a disaster