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Transducer Cable

Discussion in 'Boat Electronics' started by David, Apr 18, 2006.

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  1. David

    David Guest

    Hi all.. So, while installing my transducer ( DST50 Standard Horizon) I put
    a staple from a staple gun into the cable. Brilliant, I know. Of course
    the depth finder stopped reading depths so.. I'm guessing the cable is very
    sensitive and I wont be able to repair the cable by cutting and splicing it
    can I? I gave this a shot with no luck but I just did a quick cut & splice
    job to see if I would get any sort of reading... Shielding and other
    factors to be considered I assume?

  2. Lynn Coffelt

    Lynn Coffelt Guest

    Splicing is certainly possible. And, yes, the cable is, as you say,
    "sensitive", and the splice won't do it a whole lot of good. One must splice
    not only the center conductor, but the shield as well. Providing a little
    more shielding over the splice won't hurt a thing, and may well prevent the
    sounder's noise from leaking out into other things. (radios, loran, gps
    etc). Just remember the added aluminum foil (or whatever) added over the
    splice must be connected to the cable's shield. Should work, though.
    Old Chief Lynn
  3. Gotta be very careful though -- with analog transducers, the length of
    the cable is figured into the delay time which is what the souonder
    uses to work out the depth. Might have to recalibrate.

    Michael Porter

    Michael Porter Naval Architect / Boatbuilder
    mporter at mp-marine dot com
    *** ***
  4. There is NO difference between how a digital and analog Depthsounder
    determines depth. It is all done by timing the ultrasonic transmit pulse
    leaving the transmitter, with the reflected received pulse in the
    receiver. The difference is how the information is displayed to the
    human operator. The length of the transducer cable is irrelevent
    to that timing, as the delay is insignificant when compared to the speed
    of ultrasonic sound in water, Fresh or Salt.

    Transducer cables certainly can be spliced. It is a relativly easy
    process and with the frequencies involved usually less than 400Khz,
    any introduction of extra capacitance to the transducer cable will
    usually not cause much change in the Tx/Rx tuning of the sounder
    circuits themselves.

    I am sure that Oldtimers, like Lynn, and Larry, have done this MANY
    times, just to save some boater from having to haul the vessel just
    because he crushed the tranducer cable by setting an engine block,
    or battery on it, while futzing around in the bilge.

    Bruce in alaska
  5. Lynn Coffelt

    Lynn Coffelt Guest

    Old Chief Lynn
  6. David,

    Your splice may, in fact, be fine but your depthsounder transmitter may be

    When the staple went into the cable it probably shorted the transducer
    connection. Instead of pumping a few hundred watts into a transducer with
    an impedance of a few hundred ohms the depth sounder tried to pump this
    power into a short and may have damaged the transmitter.

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