Datamarine wind instrument

Discussion in 'Boat Electronics' started by GBM, Oct 12, 2005.

  1. GBM

    GBM Guest

    I have an old Datamarine Wind Instruments - LX-360, I think. It has worked
    fine up until now, but this year, the wind speed just reads 0.00, while
    direction works fine.

    I plugged the masthead unit directly into the back of the display, and there
    is no change, so presumably cable is OK.

    I see from http://www.dmimarine.com/ that there is a masthead speed rebuild
    kit. Has anyone done this? Are there any checks that I could make to see
    whether problem is in head or in masthead unit?

    Thanks
     
    GBM, Oct 12, 2005
    #1
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  2. GBM

    Lynn Coffelt Guest

    "GBM" <> wrote in message
    news:uYZ2f.8054$...
    > I have an old Datamarine Wind Instruments - LX-360, I think. It has

    worked
    > fine up until now, but this year, the wind speed just reads 0.00, while
    > direction works fine.
    >
    > I plugged the masthead unit directly into the back of the display, and

    there
    > is no change, so presumably cable is OK.
    >
    > I see from http://www.dmimarine.com/ that there is a masthead speed

    rebuild
    > kit. Has anyone done this? Are there any checks that I could make to see
    > whether problem is in head or in masthead unit?


    Yes, and yes. It's been a while, but in a prior life, did lots of
    masthead rebuilds. Testing can be simple if you can find the "pinout"
    (connections) on the connectors. (I don't have that data anymore)
    The masthead speed unit is a sort of AC generator, and with a scope,
    old analog multimeter, or even a pair of headphones you can see or hear the
    output of the generator while spinning the rotor by hand.
    The indicator can be tested for basic function by driving the speed
    input pins with a fairly low frequency square wave from a function
    generator.
    Big problem was having schematics of the connectors to see just what
    pins were to be connected to the poor man's test equipment.
    For a long time, Datamarine wind instruments used the same connectors,
    and it was usually easy to spot a spinning Datamarine masthead unit on your
    same dock. Visit (with best manners, and maybe a couple of cool ones in
    hand) and ask to hook up your instrument to his functioning masthead unit.
    (power connections too)
    Old Chief Lynn
     
    Lynn Coffelt, Oct 12, 2005
    #2
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  3. GBM

    GBM Guest

    "Lynn Coffelt" <> wrote >
    > Yes, and yes. It's been a while, but in a prior life, did lots of
    > masthead rebuilds. Testing can be simple if you can find the "pinout"
    > (connections) on the connectors. (I don't have that data anymore)
    > The masthead speed unit is a sort of AC generator, and with a scope,
    > old analog multimeter, or even a pair of headphones you can see or hear

    the
    > output of the generator while spinning the rotor by hand.
    > The indicator can be tested for basic function by driving the speed
    > input pins with a fairly low frequency square wave from a function
    > generator.
    > Big problem was having schematics of the connectors to see just what
    > pins were to be connected to the poor man's test equipment.
    > For a long time, Datamarine wind instruments used the same

    connectors,
    > and it was usually easy to spot a spinning Datamarine masthead unit on

    your
    > same dock. Visit (with best manners, and maybe a couple of cool ones in
    > hand) and ask to hook up your instrument to his functioning masthead unit.
    > (power connections too)
    > Old Chief Lynn
    >


    Hi Lynn,
    If I switch the head on/off several times quickly, I get a read out on the
    windspeed. This 'may' say that the head is OK. The shaft in the masthead
    unit is "sloppy" - I contacted DMI and they say that the bearing goes and
    takes out the windspeed. They have a rebuild that costs $79.00. Probably
    worth a try? I will open it up first and see what gives.

    Thanks for the reply!
     
    GBM, Oct 12, 2005
    #3
  4. GBM

    Lynn Coffelt Guest

    "GBM" <> wrote in message
    news:1D83f.8270$...
    >
    > "Lynn Coffelt" <> wrote >
    > > Yes, and yes. It's been a while, but in a prior life, did lots of
    > > masthead rebuilds. Testing can be simple if you can find the "pinout"
    > > (connections) on the connectors. (I don't have that data anymore)
    > > The masthead speed unit is a sort of AC generator, and with a

    scope,
    > > old analog multimeter, or even a pair of headphones you can see or hear

    > the
    > > output of the generator while spinning the rotor by hand.
    > > The indicator can be tested for basic function by driving the speed
    > > input pins with a fairly low frequency square wave from a function
    > > generator.
    > > Big problem was having schematics of the connectors to see just

    what
    > > pins were to be connected to the poor man's test equipment.
    > > For a long time, Datamarine wind instruments used the same

    > connectors,
    > > and it was usually easy to spot a spinning Datamarine masthead unit on

    > your
    > > same dock. Visit (with best manners, and maybe a couple of cool ones in
    > > hand) and ask to hook up your instrument to his functioning masthead

    unit.
    > > (power connections too)
    > > Old Chief Lynn
    > >

    >
    > Hi Lynn,
    > If I switch the head on/off several times quickly, I get a read out on the
    > windspeed. This 'may' say that the head is OK. The shaft in the masthead
    > unit is "sloppy" - I contacted DMI and they say that the bearing goes and
    > takes out the windspeed. They have a rebuild that costs $79.00. Probably
    > worth a try? I will open it up first and see what gives.


    Yes, by all means, take the head apart first. I'm sure, from what you say,
    it's shot, but half the problems in using the rebuild kit are in
    successfully getting the head apart without ruining something.
    Good Luck!
    Lynn
     
    Lynn Coffelt, Oct 12, 2005
    #4
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