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originally posted by: SpunGCake
a reply to: Bedlam
i was under the impression that rf signals can travel through water no problem.
i give you a challenge: next time you unlock your car if you have keyless entry see how far you can do it tell it dont work than touch your keys to your head. your body just became a range extender.
originally posted by: dodol
a reply to: Aquariusdude
from my experience, the most peaceful and enjoyable times were when i turned off all connections to phone (including phone signal).
peace
originally posted by: Tusks
Here's an article from 1987 on amateur radio (1.8 MHz) attempts at underwater and air-water transmission. The underwater transmission were limited to less than 30 meters, less in sea-water, much less when going from one medium to another. Longer wavelengths RF would penetrate water better, but was not allowed for amateurs at that time.
users.tpg.com.au...
originally posted by: Tusks
a reply to: Bedlam
So you did. I missed it. My point is that penetration does occur--not that we make a good medium for transmission.
originally posted by: Bedlam
originally posted by: Tusks
a reply to: Bedlam
So you did. I missed it. My point is that penetration does occur--not that we make a good medium for transmission.
Mine is that you get squat for power density by the time it penetrates. The pdf doesn't deal with the impedance-step reflections either, it misses a major factor in path loss. You lose about 60dB to the reflections from the air to your skin. You also get a lot of internal scattering in bone and fat. Basically, what's left of the signal after it hits your scalp and reflects (mostly), dissipates in the dermis, then hits the subcutaneous fat. That doesn't have as much conductivity, so you have another impedance step change, and more of the signal is lost. Basically that part runs around in the fat layer. Bone is another step change, more loss, then bone to spinal fluid surrounding the brain is another reflection. Spinal fluid has a hellacious path loss, like seawater. Then another step change when it hits your brain.
Your brain is actually pretty well protected from microwaves.
originally posted by: Flesh699
I'm at work and can't gather my links, but it goes deeper than this. There was a Nazi scientist that figured out the frequency that enables people to control emotions etc. The frequency then a few years later became what all music is recorded at and a few other things I think. Look it up.