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This is a link to a really interesting Text to Morse Code MP3 conversion program. I tested it out and I think it's the sort of thing we could use as part of the communication program we are looking at.
http://www.morseresource.com/morse/makemorse.php
"Morse code requires the time between dits (short pulses) and
dahs (long pulses), between letters, and between words to be as
accurate as possible.
- A Dit takes - 1 unit of time
- A Dah takes - 3 units of time
- The pause between letters - 3 units of time
- The pause between words - 7 units of time"
http://www.colorpilot.com/morse.html?adwords
"For much of the twentieth century, the majority of high-speed international
communication was conducted in Morse code, using telegraph lines,
undersea cables, and radio links. However, the variable length of
the Morse characters made it hard to adapt to automated links, so
for most electronic communication it has been replaced by more regular
formats, including the Baudot code and ASCII. "
http://www.livephysics.com/ptools/morse-code.php
Regards,
Brent Hartwig
From: dbartsch2236@hotmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Underwater Communication
Date: Thu, 31 Jan 2008 09:41:18 -0500
That sounds ideal for us! We could play with the tone frequency easy enough so that the transmitted frequency has optimum range (Lower frequencies will travel farther say 1 to 3 khz) From whom could we obtain the computer program? This sounds simple, but as yourself, programing is not my area of skill either!
The speed could be slow...say 300hz...such as the suggested slower modem speeds of yesteryear...
>From where did you hear of this morse code conversion program?
David Bartsch
From: brenthartwig@hotmail.com
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Underwater Communication
Date: Thu, 31 Jan 2008 02:31:09 -0800
David and Jens,
You made me think of an idea for communicating only using tones sent out as Morse Code from a computer to another computer. You type in a message to one computer and then press send, and the computer would send out Morse Code to the other computer(s) and just like text messaging, the text shows up on another device for someone else to read. Each computer would be able to read the incoming Morse Code sent in tones and then convert it to text.
That way you don't need to know Morse Code, just know how to type. That's the basic idea. How to program the computers is not my area.
Regards,
Brent Hartwig
> Date: Wed, 30 Jan 2008 19:27:55 +0100
> Subject: RE: [PSUBS-MAILIST] Sub Heater Options
> From: laland@artematrix.org
> To: personal_submersibles@psubs.org
>
> David
>
> Off course, I would be very happy to exchange any ideas, thoughts, and
> solutions with you.
>
> Like you said, there's a lot of problems related to underwater
> communication, and both transmitting and receiving has it's own problems
> that need solving (unless we just go shopping).
>
> It appears we both were capable of generating a musical tone under water,
> and have somebody else listening to it from a said distance.
>
> The thing is, I'm still working with this "single tone", and will do so
> until I have my own, homemade system for underwater telegraphy.
>
> (A digital, ROM based "emergency message generator" would be part of that
> system.)
>
> I need to improve the signal/noise ratio in the receiver circuitry, and
> hope to do this with adjustable bandpass filtering.
>
> And finally, when my ultrasound tone generator design is working and
> properly tested using a simple piezo-electric disk submerged in a local
> pond...
>
> then I need to think of a 10 - 20 watts output amplifier, perfectly
> matched and driving a high quality sonar transducer.
>
> Done that, I'll see if I can master two (distinctively different) tones.
>
> And if so, I think it should be possible to connect up a pair of slow
> (early 80's) data modems. One in the submarine, the other up above.
>
> And since communication with digital data can be combined with it's own
> error checking, so to speak, I believe this would be worth trying prior to
> going analog.
>
> After all this, maybe I would have gained enough confidence (and skill?)
> to try prototyping a voice-modulated utrasound transceiver with proper
> analog sound processing and all.
>
> regards,
> Jens Laland,
>
> PS.: I need to send you some schematics, but my hand-drawn sketches will
> have to be scanned at the public library, since my own computer is down at
> the moment. I'll try to get them off to you tomorrow.
>
> **
> ** Underwater communications...This is an area worth investigating. Our group
> ** has so far been able to send a simple musical tone 500 feet and pick this
> ** up well...vocal communications is still under investigations as we had
> ** problems in this mode.
> ** I have come up with a suitable transmitter but require more testing. I
> ** would love to work towards a universal underwater voice communications
> ** system that all psubbers can use...and am willing to share all testing
> ** info with you. My e-mail is dbartsch2236@hotmail.com and will devulge our
> ** findings. Let us see what if anything, we can come up with.
> **
> **
> David
> ** Bartsch>
> ** Date:
> ** Mon,
> ** 28
> ** Jan
> ** 2008
> ** 20:05:26
> ** +0100>
> ** Subject:
> ** Re:
> ** [PSUBS-MAILIST]
> ** Sub
> ** Heater
> ** Options>
> ** From:
> ** laland@artematrix.org>
> ** To:
> ** personal_submersibles@psubs.org>
> ** >
> ** Øystein>
> ** >
> ** Nice
> ** to
> ** meet
> ** another
> ** norwegian
> ** -
> ** for
> ** me,
> ** too...
> ** and
> ** you
> ** asked
> ** me
> ** do
> ** I
> ** have>
> ** a
> ** project
> ** going?>
> ** >
> ** No,
> ** I
> ** have
> ** not
> ** started
> ** welding
> ** on
> ** anything
> ** yet,
> ** but
> ** I'm
> ** working
> ** on
> ** it.
> ** In>
> ** the
> ** meantime,
> ** I
> ** have
> ** started
> ** building
> ** the
> ** various
> ** sub-systems
> ** that
> ** is>
> ** needed
> ** within
> ** a
> ** submarine.>
> ** >
> ** Right
> ** now
> ** I
> ** am
> ** assembling
> ** (ready
> ** for
> ** testing)
> ** an
> ** all
> ** brass
> ** "fore
> ** n'aft>
> ** trim
> ** indicator"
> ** inspired
> ** by
> ** the
> ** ones
> ** used
> ** in
> ** german
> ** submarines.
> ** My
> ** next>
> ** project
> ** (partly
> ** started)
> ** is
> ** to
> ** make
> ** a
> ** functional
> ** replica
> ** (in
> ** brass)
> ** of
> ** the>
> ** german
> ** Papenberg
> ** precision
> ** depth
> ** gauge
> ** (used
> ** down
> ** to
> ** about
> ** approx.
> ** 20>
> ** meters).>
> ** >
> ** And
> ** whenever
> ** it's
> ** too
> ** cold
> ** in
> ** the
> ** "mechanical
> ** dept",
> ** I
> ** just
> ** withdraw>
> ** inside
> ** and
> ** pick
> ** up
> ** some
> ** experimental
> ** work
> ** on
> ** a
> ** simple
> ** underwater>
> ** communication
> ** system.>
> ** >
> ** Jens
> ** Laland>
> ** Bryne,
> ** Norway>
> ** >
> ** **
> ** Jens>
> ** **>
> ** **
> ** Hyggelig
> ** å
> ** treffe
> ** en
> ** annen
> ** nordmann
> ** her
> ** inne.
> ** Har
> ** du
> ** no
> ** prosjekt
> ** på
> ** gang
> ** ?>
> ** **>
> ** **>
> ** **
> ** Øystein
> ** Skarholm>
> ** **>
> ** >
> ** >
> ** >
> ** >
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