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Garrett Sea Hunter - Active Pins?

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  • Garrett Sea Hunter - Active Pins?

    I am in the process of building a submersible probe for my Garrett Sea Hunter Mk II. I am getting conflicting information on which pins are the active pins on the coils and housing.

    I was told by Garrett (newbie in Tech Support) that there were only two active pins on the Coil. When I put the MM to the to the pins he suggested I get no Resistance reading. But when I put the probes to the oposite pins, I would get a resistance on the 8" mono coil of 1 ohm. But this would happen on both sets indicating that all 4 pins ARE active. My question is, are there two seperate coils in the 8" mono and what are the correct pins to use for hooking up the probe?

    I have not taken apart a Garrett Coil for the SeaHunter, but I am having trouble figuring out which pins are the right ones to conect for the probe.

    Any suggestions?

    Robert in SC

  • #2
    I think the pins are just doubled-up. I'll check mine tonight.

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    • #3
      OK, here's what I think is going on... On the Infinium DD coil it appears to me that the RX & TX coils are on diagonal pins. After measuring the mono coil for the Seahunter MkII, I think it is the same way... that is, the mono coil actually has TWO coils, one for RX and one for TX, that are completely coincident but isolated. Each is roughly 106uH and 1.5 ohms.

      I also measure the TX pulse on the bulkhead connector... looking into the connector with the females on top and males below () the TX+ is the lower left and the TX- is the upper right. Not sure about the RX polarity as I would probably have to probe the ckt board with the coil connected. But RX+ on the lower right would be logical.

      So, I think in order to make a probe for this you will either have to make a 2-coil solution, or you will have to short certain TX & RX pins together. I'm not even sure the latter would work, because in probing the bulkhead pins I noticed that the RX side seems to have a DC offset, so trying to use a true mono coil might screw up biasing.

      - Carl

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      • #4
        For anyone interested, in measuring the Seahunter TX pulse I found it to be 750pps with a TX pulse width of 70us.

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