[PSUBS-MAILIST] acoustic pinger frequency choice

[Alan James via Personal_Submersibles]

What about this Antoine,http://desertstar.com/product/divetracker-sport/Depth rating is 1000ftRange is up to 4000ft   Most depth sounders can shoot through the hull if the hull is fiberglass. I don't think it can shoot through acrylic. With depth sounders about 1/2" isthe maximum hull thickness, but pingers may work with a thicker fiberglass section.I had thought of the idea of having a miniature view port about an inch in diameter with a 1/2" thick plug of fiberglass in it. You could thenhave your transmitting / receiving equipment inside the sub shooting through thatfiberglass port. Otherwise mount it external. One problem I can see is battery range,so you would possibly need a through hull cable supplying power to the unit.Cheers Alan


      From: Antoine Delafargue via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, June 2, 2016 7:40 AM
 Subject: [PSUBS-MAILIST] acoustic pinger frequency choice
   
Hello all, I am looking after acoustic pingers to locate my sub, with the lowest frequency possible to get the longest range. However, I fear low frequency might be audible inside the sub (or giving head aches) especially given the power emitted.A youtube hearing test shows me I cant hear frequencies beyond 14kHz... so I am aiming for 16kHz
Have any of you had experience with these low frequencies <16kHz in a sub? 

regardsAntoine
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