Aeroengineer1

Member Since: January 7, 2010

Country: United States

  • News - 3D Models of SparkFun Par… | about a year ago

    For MCAD programs, STEP/STP and IGES (though STEP/STP is becoming more popular) are the standard interchange file types. STL is used for 3D printing, but is not a very clean geometry when importing everything into a standard MCAD program. All the surfaces are represented by triangles.

  • News - November Caption Contest | about a year ago

    That is like comparing bananas and bears.

  • News - September Caption Contest | about 2 years ago

    This is not exactly what I had in mind when you asked me to come over to play Mario Cart!

  • News - Your December Caption Con… | about 2 years ago

    When John was told he was assigned to work the automated milker project, he was determined to quite while he still could.

  • News - Maker Faire, SparkFun Fli… | about 3 years ago

    As you can see, we are making great progress on our human solid waste collection unit, though we are still having issues with the wiping mechanism.

  • News - Behold... ArduPilot Mega … | about 4 years ago

    Actually the real answer is that it depends. I build and design RC subs, and I can tell you that you can get a great signal into water that is not too full of minerals and other things to make it conductive. As soon as the conductivity of water increases, the signal gets attenuated significantly more. We run using 75mhz with no problem. I also know that there are systems for divers that have radio communications, and I have seen them used in salt water, I am assuming that the transmission distance is relatively small, though I do not have too much experience with them, nor do I know what frequency they use. One problem is that using an antenna that has been “optimized” (I use that term loosely) for air is far from being optimized for water. I have read a few papers that suggest that ideal antennas for water are actually much smaller than those for air due to the fact that the EM waved travel much slower in water changing the wavelength (though not the frequency).
    Adam

No public wish lists :(