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martin griffith
- Jan 1, 1970
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Bob
- Jan 1, 1970
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This was discussed in this group a while back.
The horribly mathematical paper from last november is at
http://arxiv.org/ftp/physics/papers/0611/0611063.pdf
Personally I wonder about the legal aspects of it.
I don't know all the regulatory details but it seems to
me that in the USA it would count as an intentional radiator under
part 15 which sets a limit of 30uV/m at 30m at
frequencys between 1.705Mhz-30MHz
I'd be surprised if it passed EMC testing for CE marking either.
Bob
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Phil Allison
- Jan 1, 1970
- 0
"Bob"
** Errr - do weapons of mass destruction now have to pass EMC ??
Sounds unlikely to me.
........... Phil
** Errr - do weapons of mass destruction now have to pass EMC ??
Sounds unlikely to me.
........... Phil
F
Fred_Bartoli
- Jan 1, 1970
- 0
Phil Allison a écrit :
Well, they don't even have to exist...
Well, they don't even have to exist...
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Wimpie
- Jan 1, 1970
- 0
Bob ha escrito:
Hello Bob,
I think you are right. I did a simple analysis based on the flux
linkage between two single turn loops and the nearby B does exceed
ICNIRP levels for general public:
http://groups.google.es/group/sci.p...k=st&q=wireless&rnum=1&hl=es#d66290b0c2d69e3d
I did not mention the radiated power in the posting, but a single turn
coil with D= 0.91m (3ft, the 2ft in my posting is wrong) will have a
radiation resistance of about 200e-9 Ohm (at 600 kHz). I calculated
that the resonant current would be in the range of 40A (single turn
coil).
This would result in a radiated power of about 320uW (most optimistic
result). At 30m, you may expect about 44dBuA/m (still in near field).
However when some other conductor is present (mains wiring,
reinforcement steel, etc), the radiated power can be significantly
higher as that other conductor will radiate also. This problem
happens often in RF Electronic Article Surveillance equipment (EAS).
Those are also inductive loop systems
Best regards,
Wim
PA3DJS.
www.tetech.nl
Hello Bob,
I think you are right. I did a simple analysis based on the flux
linkage between two single turn loops and the nearby B does exceed
ICNIRP levels for general public:
http://groups.google.es/group/sci.p...k=st&q=wireless&rnum=1&hl=es#d66290b0c2d69e3d
I did not mention the radiated power in the posting, but a single turn
coil with D= 0.91m (3ft, the 2ft in my posting is wrong) will have a
radiation resistance of about 200e-9 Ohm (at 600 kHz). I calculated
that the resonant current would be in the range of 40A (single turn
coil).
This would result in a radiated power of about 320uW (most optimistic
result). At 30m, you may expect about 44dBuA/m (still in near field).
However when some other conductor is present (mains wiring,
reinforcement steel, etc), the radiated power can be significantly
higher as that other conductor will radiate also. This problem
happens often in RF Electronic Article Surveillance equipment (EAS).
Those are also inductive loop systems
Best regards,
Wim
PA3DJS.
www.tetech.nl
E
Eeyore
- Jan 1, 1970
- 0
martin said:
Shame on you for not debunking it.
Graham
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Eeyore
- Jan 1, 1970
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Fred_Bartoli said:
Certainly not when being used as an excuse to get involved in stupid wars.
Graham
F
feebo
- Jan 1, 1970
- 0
hmm it is very interesting.
About 2 or 3 years back, I saw a mat style object that you just put on
the table in the kitchen and when you get home each day, you just
throw your moby, mp3 player etc on this mat and it recharges them all
with only a single PSU... thus dispensing with a plethora of chargers.
It was a huge flat coil that would induce in the same way as
conventional transformers. Inside your chargees (it's a word now
)you would have to have an induction coil and regulation etc... a
useful posit was that such equipped devices could provide incidental
charging from existing fields so charges would last longer by
"scavenging" from the fields around us every day.
Definately possible, but it needs a lot of co-op from
research/design/manufacturers and you have to keep the health lobby
happy about radiant emissions etc. It might take a while.
M
martin griffith
- Jan 1, 1970
- 0
I'd run out of coffee,
martin
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Don Bowey
- Jan 1, 1970
- 0
It should have stayed lost.
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Robert Baer
- Jan 1, 1970
- 0
Gee, Hertz, Marconi and others knew this crap a few years ago or so....martin said:
E
Eeyore
- Jan 1, 1970
- 0
Robert said:
Tesla !
Graham
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Robert Baer
- Jan 1, 1970
- 0
Yeah; the money guys almost killed him over the free power concept.Eeyore said:
E
Eeyore
- Jan 1, 1970
- 0
Robert said:
Talking of 'free energy', the k00ks just love to talk of Tesla. It's a
'signiature' that gives them way every time.
Tesla wasn't claiming it was 'free' btw.
Graham
