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  1. #1
    Member Corkpuller's Avatar
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    Lost and found MDI

    Mentioned before my Helix 12 SI G2N was not displaying DI.

    Found it this morning when I switched to HD SI Xducer.
    Also works with Compact SI, but NOT with MEGA SI.

    Did I get the wrong Xducer in the box ??????


    "ain't too smart.....but I'm always thinkin"

  2. Member Corkpuller's Avatar
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    "ain't too smart.....but I'm always thinkin"

  3. Member Wayne P.'s Avatar
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    #3
    Quote Originally Posted by Corkpuller View Post
    Mentioned before my Helix 12 SI G2N was not displaying DI.

    Found it this morning when I switched to HD SI Xducer.
    Also works with Compact SI, but NOT with MEGA SI.

    Did I get the wrong Xducer in the box ??????
    The MEGA SI transducers have a dedicated Down Imaging crystal in the transducer. As stated in the other post, what you pictured is the MEGA SI transducer.

    The only way to not have MEGA DI is choose the wrong transducer in the unit menu, use the wrong Y cable for a dual transducer setup, or the transducer is bad.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  4. Member Corkpuller's Avatar
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    #4
    test


    "ain't too smart.....but I'm always thinkin"

  5. Member Corkpuller's Avatar
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    #5
    The only way to not have MEGA DI is choose the wrong transducer in the unit menu,
    I have to choose the wrong one to get any DI

    use the wrong Y cable for a dual transducer setup,
    I'm using the correct cable

    or the transducer is bad.
    if it's bad, how can I get DI simply from a settings change


    "ain't too smart.....but I'm always thinkin"

  6. Member Corkpuller's Avatar
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    #6
    It's not a matter of MEGA DI , it's any DI display


    "ain't too smart.....but I'm always thinkin"

  7. Member Wayne P.'s Avatar
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    #7
    Quote Originally Posted by Corkpuller View Post
    It's not a matter of MEGA DI , it's any DI display

    You stated you get DI with a Compact SI transducer which is blended DI, not dedicated DI that MEGA SI units have.

    If the DI crystal in the MEGA SI transducer is faulty you cannot have DI using the MEGA transducer setting.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  8. Member Wayne P.'s Avatar
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    #8
    What is the model of your Y cable?
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  9. Member Corkpuller's Avatar
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    #9
    So, an internal circuitry problem

    9 M SIDB Y
    with the Motorguide adapter


    "ain't too smart.....but I'm always thinkin"

  10. Member Corkpuller's Avatar
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    #10
    I get DI with HDSI too.


    "ain't too smart.....but I'm always thinkin"

  11. Member Wayne P.'s Avatar
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    #11
    Quote Originally Posted by Corkpuller View Post
    I get DI with HDSI too.
    Yes, the Compact SI and HDSI do not have Down Imaging. Down Imaging with those transducers is COMPOSITE DI using the two SI crystals. The SI crystal length is the only difference between those two. It's been that way since Jan 2010.

    That is NOT what the MEGA SI transducer does. It has a dedicated DI crystal in it, so does the SOLIX MEGA SI transducer and ONIX HDSI transducer. That dedicated DI crystal has its own separate circuit. That is why you have to use the current Y cable for a dual transducer installation. You have the current one, so that means either the DI crystal is faulty or the circuit for it is faulty.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  12. Member Corkpuller's Avatar
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    #12
    Wonderful.
    This just keeps getting better every day.
    Pulling that cable from the back into the helm was like tryin to run a broom handle up gnats ass.

    Thanks Wayne.

    I suppose I could disconnect the Y cable and run the Xducer cable straight to the unit, to eliminate that as a possibility.


    "ain't too smart.....but I'm always thinkin"

  13. Member Wayne P.'s Avatar
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    #13
    Quote Originally Posted by Corkpuller View Post
    Wonderful.
    This just keeps getting better every day.
    Pulling that cable from the back into the helm was like tryin to run a broom handle up gnats ass.

    Thanks Wayne.

    I suppose I could disconnect the Y cable and run the Xducer cable straight to the unit, to eliminate that as a possibility.
    Yes that is a good idea.

    If you pull out the transducer, tie some small rope or heavy duty string to the plug and you will have a pull string to install the new one.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  14. Member Corkpuller's Avatar
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    #14
    Can I confirm the MEGA DI working without being on the water ?
    Would rather wait til I was in my shop to start tearing up my neat wire job.
    To remove the Y cable and run it straight to the unit.


    "ain't too smart.....but I'm always thinkin"

  15. Member Wayne P.'s Avatar
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    #15
    Quote Originally Posted by Corkpuller View Post
    Can I confirm the MEGA DI working without being on the water ?
    Would rather wait til I was in my shop to start tearing up my neat wire job.
    To remove the Y cable and run it straight to the unit.
    Well you will have a DI view and may have some fuzzy returns if you turn the Sensitivity to max. Use 455 kHz for DI.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

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    #16
    Quote Originally Posted by Corkpuller View Post
    Can I confirm the MEGA DI working without being on the water ?
    Would rather wait til I was in my shop to start tearing up my neat wire job.
    To remove the Y cable and run it straight to the unit.
    I do a lot of my trouble shooting with transducers in bucket of water.

  17. Member Wayne P.'s Avatar
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    #17
    Quote Originally Posted by ntslam View Post
    I do a lot of my trouble shooting with transducers in bucket of water.
    Me too sometimes, but right now have a MEGA SI transducer on a rack that has it about 9" from the floor beside my desk. I get a fuzzy image from the floor on DI and a "bottom" return on 2D sonar along with a surface clutter line.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  18. Member Corkpuller's Avatar
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    #18
    Connected the SI Xducer directly to the unit, bypassing the Y cable.
    We have Mega DI now.

    Don't suppose there's a way to test and tell if the Y cable is bad or the Motorguide/Lowrance adapter cable may be the culprit.
    Matter of replacing parts now I reckon.

    I am SO THANKFUL I don't have to replace the Xducer.


    "ain't too smart.....but I'm always thinkin"

  19. Member Wayne P.'s Avatar
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    #19
    The 2D side of the Y cable has nothing to do with the DI connection. You have a faulty DI circuit if you have the 9 M SIDB Y cable.
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  20. Member Corkpuller's Avatar
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    #20
    Ok thanks Wayne. To confirm, you do mean faulty DI ckt withing the Y cable right?
    Humminbird Rep said yesterday that the 2D thru hull Xducer could possibly be causing my problem. I didn't understand how.

    I just ordered a new Y cable from BBG.


    "ain't too smart.....but I'm always thinkin"

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