Re: TI-H: Re: Laser Network (OT)
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Re: TI-H: Re: Laser Network (OT)
I'm surprised that Globalstar didn't decide to buy the iridium Sats, it
would have cost them a lot less than putting up twenty some odd new ones and
also by what I know they are totally compatibly saying that they both use
Qualcomm systems but anyways its sad 3+ billion down the drain... ...you
could check Globalstar (I think that's what they were called) their sats are
about the same as Iridium's were,well now a moment of silence to the loss of
a blooming company such as Iridium.........
...I don't think an laser would be good for any wireless comunications
saying that it could be interupted easly by a Periguin flying right through
or even a crow or even the common rain shower would interupt lasers. I think
it'd be better to use an radio signal so it would be harder to interupt.
You could even just buy one of then new 900Mhz cordless phones or one of
those that have two sets and one base... ...or you might be able to get
one of those new cells that you can use as two way radios when within i
think it was five miles of an compatable phone well there's my two cents for
the day (where did that phrase come from).
Bernard
----- Original Message -----
???: "Giles Pollock" <glp71s@mailandnews.com>
???: <ti-hardware@lists.ticalc.org>
????: Tuesday, March 28, 2000 00:23
??: Re: TI-H: Re: Laser Network (OT)
>
> i suppose it would be like an ir serial port, but it could probably go for
> longer ranges, as for the uses, you could use it for city skyscraper
> communication, just outside a window, and it couldn't be interuppted by
other
> communications, such as is the case with microwave transmitters... i saw a
news
> article here mentioning something similar but for satellites, as competing
> businesses in neighboring buildings destroying the other buildings
microwave
> transmitter by sending a strong signal when the other is trying to recieve
data
> from a satellite... on the subject of satelites, i wonder how much
bandwidth the
> iridium system could support... its unfortunate that they plan to dump the
> lot... i saw a site called www.saveiridium.com at least someone is trying
to
> save the satelites, they make interesting flares at night if you look at
the
> right time... anyway, using cables to communicate between buildings would
> require many cables... all underground. Why not a set of laser
transmitters on
> the roof or on certain window ledges...
>
> Nick wrote:
>
> > it'd be kinda amusing, yeah, and it would work if you had the
inclination.
> >
> > it would work like the IR serial ports most laptops already have; but if
you
> > can already -see- the other computer, then the cable you string out
between
> > them ought to be secure already, no? ;)
> >
> > y'know what would be really really cool, is changing the IR port on a
laptop
> > to work with a laser; it would be VERY simple to do, and highly amusing.
> > change the LED in there to a laser diode, use a transistor to switch the
> > larger current the LED demands, and pow.
> >
> > a laser Ethernet would probably be a mite slower than fiber, and if you
ran
> > a hub then all the computers would have to be able to -see- the hub,
which
> > could get interesting.
> >
> > and if i wanted to make it insecure, i'd pass a semisilvered mirror in
the
> > way of the beam, or semisilver one of the existing mirrors with a bias
on
> > the forward signal.
> >
> > or i could just tap the transciever at the hub.
> >
> > it'd still be wicked cool, though, i agree ;)
> >
> > ohohohoh hey, lookie what i found -- go to www.conversant.com & click on
the
> > banner thing for PAV Data Systems.
> > now THAT's amusing.
> >
> > and they're right here in boston, too! neat-o.
> >
> > --nick
> >
> > Nick Foster / Bistromath / zaphod@coe.neu.edu
> > KeyID 2048/1024 0x663CB446
> > 6CAF FFD4 F9BA 64BA ECF9 032E 7402 3886 663C B446
> >
> > ----- Original Message -----
> > From: "Giles Pollock" <glp71s@mailandnews.com>
> > To: <ti-hardware@lists.ticalc.org>
> > Sent: Monday, March 27, 2000 6:14 AM
> > Subject: TI-H: Laser Network (OT)
> >
> > >
> > > I had an idea earlier today, to make a secure and wireless network...
> > > You could use a 10BaseF tranciever (the ones that have two fiber
> > > connections, i take it that one is transmit and one recieve) and
replace
> > > the transmitter with a laser diode (maybe extra circuitry) and use a
> > > different reciever. With a few mirrors you could focus the laser beam
> > > into a reciever (say a photodiode...) and it wouldnt require much to
> > > make an aiming device, if the entire arrangement was bolted to
something
> > > secure, say a window sill or something. I have a rough idea on how you
> > > could make an automatic aiming device using another mirror and another
> > > laser with a few photodiodes and small servos. The laser would be
> > > completely secure, it would be almost impossible to infiltrate the
beam.
> > > The only disadvantage would be that it would be rather expensive...
> > > anyone got any other ideas?
> > >
> > >
> > >
> > >
>
>
>
>
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