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Re: [PSUBS-MAILIST] Re: more wireless communication, 'n unorthodox innie/outie power supply
Only kinda. My grandpa was a communications expert for
the state of California for a few decades. He was
explaining some of the tecniques they used to increase
the bandwidth on a low frequency carrier wave. You can
use stepped modulation and demodulation to get much
higher bandwidth while retaining low frequency. Also,
a little compression goes a long way. You could
communicate quite comfortably at 9600 baud (Although
transfering charts or images would be painfull.) Also,
some of the communications technoligies I've looked
into use multiple frequency ranges to increase
bandwidth. Anyhow, just some thoughts.
Warren.
--- Charlie Simone <charliesimone@hotmail.com> wrote:
> At the 802.11 freq. only surface communications
> shall be possible. Also,
> the higher the freq. the more bandwidth you have.
> So, at .300 Mhz you
> should only have about 9600 baud max. and at let’s
> say 2.0 Ghz you could
> have T1 speed. You should look into the Amateur
> radio laws. They have a
> 300 Mhz. Freq for experimentally purposes only. You
> could probably mess
> around here a little. Test is cake and it’s fun too.
>
>
> >From: Warren Greenway <opensourcesub@yahoo.com>
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: Re: [PSUBS-MAILIST] Re: more wireless
> communication, 'n unorthodox
> >innie/outie power supply
> >Date: Mon, 10 Nov 2003 18:27:37 -0800 (PST)
> >
> >When I get the time I plan to make some IrDA
> >trancievers that work acoustically for submerged
> use.
> >I need to do some research to find the most
> suitable
> >frequency, but it should work great. This would
> allow
> >you to communicate and control remotely through the
> >medium of water.
> >
> >Warren.
> >
> >--- Ian Roxborough <irox@ix.netcom.com> wrote:
> > >
> > > I'm hoping to have an external 802.11 antenna,
> with
> > > a more traditional
> > > thru-hull, but 802.11 will be great for short
> > > distance surface
> > > communication with surface vessels, plenty of
> > > bandwidth (more for b and g
> > > type 802.11) for video conferencing and
> transmitting
> > > video footage or
> > > digital still imagines taken on the last dive.
> > >
> > > One thing about shining light through acrylic,
> as
> > > the temperature
> > > of the acrylic increases, there is a rapid
> decrease
> > > in the in it's
> > > strength. While this might not be a problem for
> > > communications
> > > (this is will be pretty easy to test as well,
> just
> > > measure the
> > > temperature of the acrylic after different
> lengths
> > > of exposure to
> > > the level of light required for communication),
> it
> > > could be a big
> > > problem for sending light for energy through
> acrylic
> > > to a solar
> > > cell.
> > >
> > > Ian.
> > >
> > >
> > > On Mon, 10 Nov 2003 10:35:17 -0700 (MST)
> > > dinosnider666@spacemail.com wrote:
> > >
> > > >
> > > >
> > > > Ryan informs me my
> > > ultrasonic/wireless/magnetic/light communication
> > > proposal generated huge responses - nice to be
> > > loved.
> > > > Presently talking to award winning
> engie/computer
> > > guy at UW Sanjay Singh about jury-rigging 802.11
> > > card to use magnetic induction instead.
> > > >
> > > > Just want the credit. Guy in Slashdot took my
> > > advice on using monitor to also use am radio to
> > > chat - no credit. The jerk. Don't be a jerk!
> > > >
> > > > Also like idea of powering thru hull with
> magnetic
> > > induction. In theory, by moving where emitter
> is,
> > > can 'plug in' to various placed on hull. For my
> > > seawater wetcell idea, the entire power supply
> is
> > > effectively external - so power passenger
> > > compartment THRU hull from OUTSIDE instead of
> usual
> > > VV. Could 'plug in' either with mechanical
> latches-
> > > or via electromagnetism. I'm playing with this
> for
> > > house-based mag-ind heaters/power plugs- with no
> > > plug for kids to stick a fork into!!!
> > > > Nice thing about using sonics, is no need to
> find
> > > right/same in/out plug position - transmits
> thruout!
> > > Using vibration isolation mounts would isolate
> > > various sound-based communicatons, combined with
> > > basic filtering would allow multiple ultrasonic
> > > chats at same time.
> > > >
> > > > No reason could not isolate sound
> directionally
> > > from water like a whale, build in sound lag like
> in
> > > air for our ears (no learning needed), 'n have a
> > > sense of being 'immersed in the water' without
> being
> > > trapped in a tin can. SUrround sound, including
> > > up/down, all the better.
> > > > The size of soundwave dictates whether can
> sense
> > > volume differnece as well as sound lag. Thus
> > > elephant head being good with infrasonics. Me,
> I'd
> > > love to throw in a compression formula to expand
> > > hearing on ends to well into infra/ultrasonics -
> > > hear the dolphins play! They like 40-70,000 hz
> the
> > > best.
> > > >
> > > > Looking to jury rig kid's toy DIY I found on
> laser
> > > pointers, embed blue laser into hunk of acrylic
> with
> > > mag-ind recharcher - or use solarcell thru
> > > transparent - to allow superior scuba chat.
> Figure
> > > could do it for about 20 bux.
> > > >
> > > > Hardcore scuba divers don't like wasting all
> that
> > > air in a full face mask.
> > > > Anyway, just some ideas.
> >
> >
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