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RE: starship-design: Wirelss power transmission
The legalities of our setup are pretty much in good hands. Health
concerns, however, are a major issue, since the mobile units are being
worn by living beings. That is one of the reasons I want to avoid using
microwaves.
Our "cage" is a one floor of a five story building. The inner walls
have been midified and grounded to provide a radio shield. So far we have
not had any problems with the cage itself. The problem is finding a form
of wireless power transmission that is not going to cook a human standing
in the transmission beam.
Long range is not needed at all...the remote units will never leave the
building. Something like this could be used in robotics on a starship
that won't leave the starship (repair droids, maybe) but will always be
on...so batteries are to be avoided if not for backup power.
Thanks,
Fred
"L. Parker" wrote:
> Microwave power reception isn't that difficult, most of the parts are
> available off the shelf I think. I haven't had anything to do with that
> field in over thirty years though. I was simply concerned with the other
> ramifications of what you said. If your building is properly shielded,
there
> isn't really any problem with either the legalities or the safety risks.
>
> I used to work in a room that was a fifty by fifty cage inside a four
foot
> thick concrete bunker...our concerns were mostly directed at external
> listening devices rather than the FCC or health problems....
>
> Lee
>
> > -----Original Message-----
> > From: owner-starship-design@lists.uoregon.edu
> > [mailto:owner-starship-design@lists.uoregon.edu]On Behalf Of
> > Fred Reyes
> > Sent: Monday, January 24, 2000 9:14 AM
> > To: starship-design@lists.uoregon.edu
> > Subject: RE: starship-design: Wirelss power transmission
> >
> >
> > Would this work if I had multiple crystal receivers operating
> > in parallel
> > so that more power can be achieved? I think I will require more than
> > milliwatts. I am not worried about any radio energy leaving
> > the building,
> > since our building has been specially built as a faraday cage. Once,
> > while working on a contained plasma, we pumped quite a bit of
> > radio energy
> > into it and got miniscule results outside the building when
> > checking for
> > leaks.
> >
> > My ultimate goal here is to have the remote units not require
> > any other
> > power other than that provided by the matrix as long as they
> > remain in
> > range. If the units move out of range of the matrix, then they would
> > switch to battery power.....but I do not want to rely on
> > batteries as the
> > main source of power.
> >
> > Also, there are no hardrives or any other magnetic media in
> > the remote
> > units....they are composed completely of RAM and ROM (kinda
> > like one big
> > virtual drive).
> >
> > Thanks,
> > Fred
> >
> >
> > "L. Parker" wrote:
> > > > Old crystal radio sets were able to work without any external
> > > > power (either
> > > > battery or wall plug) simply by converting the
> > transmitter's broadcast
> > > > power into sound energy.
> > > >
> > > > If you need more power, take a look at pirate radio
> > > > equipment. Provided
> > > > you stay out of the actual AM radio band (or other populated
> > > > frequenccy
> > > > bands,) and don't actually transmit any information, you
> > > > shouldn't have to
> > > > worry about the FCC. I believe there are certain frequency
> > > > ranges which
> > > > are reserved for applications like this.
> > >
> > > Not quite correct...There are some channels set aside for
> > hobbyists, but
> > > simply not broadcasting a "meaningful" signal will not
> > keep you out of
> > > trouble with the FCC.
> > >
> > > Although frequency does relate to possible total power
> > output, that
> > does not
> > > mean that you can't broadcast quite a bit of power at
> > lower frequencies.
> > > Also, the higher the frequency the closer you come to
> > making a microwave
> > > oven out of your lab, not a good place to be while working.
> > >
> > > Then there is your neighbor, no matter what frequency you
> > think you are
> > > broadcasting on, there are almost always "lobes" or
> > sidebands (get a
> > good
> > > book on RF Radiation), if you crank up the power high
> > enough, you will
> > start
> > > to "bleed" into your neighbors TV, radio, etc. Crank it a
> > little higher
> > and
> > > you can actually burn his TV out. Modern solid state
> > electronics are
> > not as
> > > robust as vacuum tube stuff, it takes very little to fry their
> > electronic
> > > innards.
> > >
> > > Parker's Law: a ten dollar transistor will invariably
> > protect a ten cent
> > > fuse by blowing first...
> > >
> > >
> > >
> > > Lee
> > >
> > > __________________________________________
> > > "They make a desert and call it peace."
> > > Tacitus
> > >
> > >
> >
> >
> > ______________________________
> > How to find me:
> > AOLIM: Warlord400
> > Personal Site:
> > In progress!
> >
> > ______________________________________________________
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> >
>
>
______________________________
How to find me:
AOLIM: Warlord400
Personal Site:
In progress!
______________________________________________________
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