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Thread: Under my arm (subtitle = the human antenna)

  1. #1 Under my arm (subtitle = the human antenna) 
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    I noticed this today. I live pretty far into the country. Radio reception is not good here. On Saturday mornings, if I am at home I like to listen to a couple of radio stations, but they do not come in well here, especially inside.

    I noticed if I hold my little Sangean radio against my chest, it comes in pretty well. It feels kind of neat too, as it resonates on my ribcage.

    I deduce that the human body is quite good at receiving and re-transmitting radio frequency waves. It works with my tv as well.
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  2. #2  
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    Typical Mayflow nonsense.
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  3. #3  
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    Yeah, but I get the station this way, and my body is a very good antenna.
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  4. #4  
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    Addendum. I live in a tiny Casita in the country. Now I notice if I turn off my tv, my radio comes in much better. This may be a part of why I got this tv so cheap.
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  5. #5  
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    Quote Originally Posted by mayflow View Post
    Addendum. I live in a tiny Casita in the country. Now I notice if I turn off my tv, my radio comes in much better. This may be a part of why I got this tv so cheap.
    It also works with lightning, try it during a storm.
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  6. #6  
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    Quote Originally Posted by x0x View Post
    It also works with lightning, try it during a storm.
    What am I supposed to try doing during a storm?

    What I notice now is that maybe my body was absorbing the eminations from the tv that were interfering with the radio signal. Can that be good for my body?
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  7. #7  
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    A well known phenomenom: Hold a remote control transmitter (garage door opener, car door opener, etc) against your head, it will lengthen the range noticeably. This is not a youtube hoax. The water in your head helps. I have tried it mnay times for pragmatic and experimental reasons. Serious youtube will demonstrate it. Try it yourself.

    CB radios aka tranceivers will have lobes of increased effectiveness that are a function of antenna's location on the vehicle. Putting it near the back of the vehicle increases the power and sensitivity toward the front.

    As for commercial FM receivers. Far away from the transmitter the receiver becomes sensitive to its antenna quality. Knots and loops cause interfence in it. It is often cited that antennae must be at least one half a wavelength long. For 88 mHz that would 0.5 * 300E6 / 88E6 = 1.7 m. The antenna picks up the electrical part of the EMR.
    For commercial AM , the antennae would be too long for portable or home use, for 600kHz, 0.5 x 300E6 / 600E3 = 125 m. The solution is too use the magnetic part of the signal via a ferrite core antenna (it has a long fine Cu wire wrapped around the core).

    Anyway just like radio reception (or optical reception) can be hindered by location, objects, weather, upper atmospheric conditions, day versus night it can also be helped by those conditions
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    That nonsense works fine with me too. When the condition are bad and the radio start noising a lot, I know exactly where I should stand to boost the reception...
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  9. #9  
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    Boing 3000, I think you are cool. You speak from personal experience, and what you can see actually works. I can believe what you say.
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  10. #10  
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    Quote Originally Posted by mayflow View Post
    What am I supposed to try doing during a storm?
    Stay outside, arms over your head.

    Can that be good for my body?
    Very good.
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  11. #11  
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    Quote Originally Posted by mayflow
    Boing 3000, I think you are cool. You speak from personal experience, and what you can see actually works. I can believe what you say.
    Thanks Mayflow, I also think you speak from personal experience. But I also think that everybody does that. On this forum there are a lot's of people whose personal experience include tons of math related to tons of scientific knowledge. I don't think it is a good attitude to express disappointment when they do exchange that knowledge with you.

    About getting en-lighted, I suggest you don't follow literally x0x advice, because repeating Ben Franklin experiment will just make you en-lightning'ed.

    I don't like Ockham's razor principle, but generally it still is a good approach. In this post, maybe instead of "human body is quite good at receiving and re-transmitting" you should have gone for the simpler "good at bouncing EM waves".
    I also know from first hand that human body can transmit current So it must be the reason why metric wavelength can be influence by any bag of salted water
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  12. #12  
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    It's very interesting and this is looking like more and more research is being done on this. From this article I read Ham Radio Blog by AG1LE: Antenna Experiments - Human Body Resonance Frequencies on this, it looks like the human body has a lot of resonances in the FM and VHF frequency bands. Microsoft is also doing a lot of research I believe as well.

    AS far as the math goes, sure a lot of people have more school than I do, and people I work with have PHD's in electrical engineering, and I can learn from them and do learn from them, but I also know that to teach you have to be able to know how to put things in ways that you can tell the student is comprehending. The lady from Brazil I was teaching for the last two weeks at work said I am a really good teacher to her and she has a PHD in electrical engineering (They may buy around $300,000) of equipment from us in TEMCELLS and possibly GTEM's from us and eventually maybe high frequency anechoic chambers as well, although that would be a lot more money. but if you want to accurately measure above a GHz you need them.

    One thing her and I agreed on which does not maybe sit well with my company since we make and sell GTEM's is that if she can fill the frequency gap between a 15 cm temcell and a high frequency chamber like I use (which is GREAT over 1 GHz, but is bad at longer wave lengths) with lower frequency anechoic chambers the uniformity of the waves will be much better than it is in GTEM's.

    Oh, incidentally our 15cm temcell is rated to 400 MHz, but I tested it and it is really only good up to 350 MHz. In smaller sensors we can use a 7.45 cm temcell all the way to a GHz, but some sensors are too big to fit as we do ISO 9000, ISO 17025, IEC, and A2LA certified calibrations and the sensor can not take up more than a certain percentage of the space they are being tested and measured in.
    Last edited by mayflow; 10-06-2014 at 03:35 PM.
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