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What to use as test pingers?

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  • What to use as test pingers?

    Hi everyone!

    Our team is looking in to using hydrophones to locate pingers this upcoming year. I was wondering what you all use as pingers to test your sub before competition. We don't have a large budget, so we were looking in to solutions like "bluetooth speaker in a ziplock bag". I was wondering if any of you have had success with some sort of low-cost method like this, or if not, what the best solution is, and maybe we could look in to a sponsorship.

    Thanks for your help. Looking forward to competition!

  • #2
    Originally posted by batkins View Post
    Hi everyone!

    Our team is looking in to using hydrophones to locate pingers this upcoming year. I was wondering what you all use as pingers to test your sub before competition. We don't have a large budget, so we were looking in to solutions like "bluetooth speaker in a ziplock bag". I was wondering if any of you have had success with some sort of low-cost method like this, or if not, what the best solution is, and maybe we could look in to a sponsorship.

    Thanks for your help. Looking forward to competition!
    batkins Below is the base model that we use in the water, though ours is modified a bit (does not alter the acoustic pattern though).

    http://www.teledynemarine.com/alp-365-pinger

    I am not a hydro-acoustics person so take the following for what it is.

    1. A speaker (bluetooth capable or wired) will not transmit sound in a similar waveform, when compared to the pinger. The mechanism to generate sound it different (won't go into details, but PM me if you want to know more on this).

    2. Can you control the frequency of the pings and the ping intervals? If not, then I am not sure the bluetooth speaker will be of much help.

    Instead, please click the below link and download the waveforms to test your system against. You can also ask other teams if they are willing to share their pinger recording.

    https://robonationforum.vbulletin.ne...tual-waveforms

    Hope this is helpful (somewhat).

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    • #3
      We use the JW Fishers MFP-1 pinger. It's got adjustable period, duration, and frequency, and is water activated. Also it's pretty cheap compared to the teledyne one at about 1000 bucks: http://www.jwfishers.com/products/pingers-mid.html

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      • #4
        JW is a good alternative source
        • Benthowave sells pingers (20 to 40 kHz)
        • Applied Acoustics sells a range of pingers
        • RJE sells various pingers, some are single frequency (or just a few frequencies), but it will get you in the ball park (and tend to be cheaper)

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