Announcement

Collapse

Forum rules and expectations

Hello, and welcome to the forums at the Nautilus Drydocks, formerly Sub-driver.com!

We welcome anyone with a passion for submarines and a desire to learn and share knowledge about this fascinating hobby. Use of these forums indicates your intention to abide by our code of conduct:


1. No spam. All automated messages, advertisements, and links to competitor websites will be deleted immediately.

2. Please post in relevant sub-forums only. Messages posted in the wrong topic area will be removed and placed in the correct sub-forum by moderators.

3. Respect other users. No flaming or abusing fellow forum members. Users who continue to post inflammatory, abusive comments will be deleted from the forum after or without a warning.

4. No threats or harassment of other users will be tolerated. Any instance of threatening or harassing behavior is grounds for deletion from the forums.

5. No profanity or pornography is allowed. Posts containing adult material will be deleted.

6. No re-posting of copyrighted materials or other illegal content is allowed. Any posts containing illegal content or copyrighted materials will be deleted.
See more
See less

Salt Water Communications

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Bob Gato
    replied
    Most of the fully submersible sub models run in clear swimming pools (my observation) and unfortunately the growing trend is to convert the fresh pool water to salt water to enable electric chlorine manufacture on site-The operational environment is growing even smaller!

    Leave a comment:


  • Das Boot
    replied
    Originally posted by coryhenry View Post
    I live in San Diego and fortunately or unfortunately (depending on how you see it) I am surrounded by salt water. This includes our local RC pond. I just received the Kilo kit from Bob Martin (thank you very much Bob) and wanted to explore ways to communicate in salt water. I came upon this research paper that describes how they developed an acoustic system for RC vehicles that is simple and intuitive using acoustics. IT looks like the form factor could be implemented in RC Submarines and I wanted to get the opinions from the experts on here. In the meantime I plan to run the antenna up through the a snorkel so I can run at periscope depth in the local pond. I have about six months left in my Middle East deployment so have time to work out the problem set :)

    Here is the link to the paper
    http://robert.katzschmann.eu/wp-cont...015compact.pdf

    Thoughts?
    Cory
    Even the tried and true 75 MHz radios don’t like salt water. Real subs use VLF, Very Long Frequency, to communicate with a base. These receiver antennas are massive. Besides, running in salt water is not advised. Corrosion being the factor. Try these guys. https://sandiegoargonauts.com
    Last edited by Das Boot; 07-22-2020, 02:15 PM.

    Leave a comment:


  • coryhenry
    replied
    Originally posted by SteveT44 View Post
    Apparently the Arduino doesn't have the power for an acoustic system.

    http://my.fit.edu/~swood/John%20Clau...al%20Paper.pdf


    If you look to OTS solutions, acoustic modems looks like the way to go. With two of these and some programming on your part, you can probably come up with a workable acoustic control system.

    https://bluerobotics.com/store/comm-...ms/wl-11003-1/
    Great link, $1400x2 is getting closer to doable.

    Leave a comment:


  • coryhenry
    replied
    Well I just got back some quotes for acoustic transmitters and now I know why they are not used in RC hobbies. Transmitters run in the $7000 range :(

    Leave a comment:


  • SteveT44
    replied
    Apparently the Arduino doesn't have the power for an acoustic system.

    http://my.fit.edu/~swood/John%20Clau...al%20Paper.pdf


    If you look to OTS solutions, acoustic modems looks like the way to go. With two of these and some programming on your part, you can probably come up with a workable acoustic control system.

    https://bluerobotics.com/store/comm-...ms/wl-11003-1/

    Leave a comment:


  • coryhenry
    replied
    Originally posted by redboat219 View Post
    Funny this is the exact study I referenced in the first post :)

    Leave a comment:


  • redboat219
    replied
    https://youtu.be/Dy5ZETdaC9k

    swims like an injured fish, imagine a shark suddenly gobbling it up.

    Leave a comment:


  • Bob Gato
    replied
    How freaking cool is that! Its not a far stretch of the imagination to see the controls interfaced with an above surface link. And secondary-the hydraulic propulsion is way cool (good for Sci-fi and future sub models)

    Leave a comment:


  • redboat219
    replied
    Check out this robot fish https://www.google.com/url?sa=t&sour...=1594983359058

    Leave a comment:


  • coryhenry
    replied
    Originally posted by redboat219 View Post
    You could eliminate the radio and just hook a handheld game controller directly to the arduino.
    You are absolutely correct, I just wanted to make a package that could be used with any system and keep it comfortable for the normal RC user, not always a gamer :)

    Leave a comment:


  • redboat219
    replied
    You could eliminate the radio and just hook a handheld game controller directly to the arduino.

    Leave a comment:


  • coryhenry
    replied
    This is the architecture I was thinking could work.
    Click image for larger version

Name:	Acoustic Control.jpg
Views:	69
Size:	71.3 KB
ID:	141734

    Leave a comment:


  • Scott T
    replied
    Not sure if this could be done but what if you made a repeater radio that could plug in your radio receiver then translates the received signal and sends it out as 75 hz. You could then buy the latest greatest radio and plug its receiver in the repeater radio. While you are at it add WIFI so you could send commands from a phone. Phones don't show up well in sunshine though.

    Leave a comment:


  • redboat219
    replied
    Electronics are beyond me but how about a system that uses acoustics? Going back to the IR remote, how about swapping a piezoelectric transducer to the IR diode to send out "pings" which corresponds to control commands. An piezoelectric receiver on the boat listens for the pings
    Last edited by redboat219; 07-15-2020, 03:36 AM.

    Leave a comment:


  • coryhenry
    replied
    I did see some research with laser comms. They do require a sophisticated tracking and aiming mechanism to ensure the transmitter and receiver are always in alignment. The IR systems have a very wide beam so don't really have that problem.

    Leave a comment:

Working...
X