RE: starship-design: Wirelss power transmission

["L. Parker" <lparker@cacaphony.net>]

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
>  >
>  >
>
>
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