<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1464821453539_4307"><span>What about this Antoine,</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4163" dir="ltr"><span><a href="http://desertstar.com/product/divetracker-sport/">http://desertstar.com/product/divetracker-sport/</a></span></div><div id="yui_3_16_0_ym19_1_1464821453539_4330" dir="ltr"><span>Depth rating is 1000ft</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4207" dir="ltr"><span>Range is up to 4000ft</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4206" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4294"> Most depth sounders can shoot through the hull if the hull is fiberglass. </span></div><div id="yui_3_16_0_ym19_1_1464821453539_4354" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4353">I don't think it can shoot through acrylic. With depth sounders about 1/2" is</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4358" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4357">the maximum hull thickness, but pingers may work with a thicker fiberglass </span></div><div id="yui_3_16_0_ym19_1_1464821453539_4356" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4364">section.</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4250" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4249">I had thought of the idea of having a miniature view port </span><span id="yui_3_16_0_ym19_1_1464821453539_4243">about an inch in </span></div><div id="yui_3_16_0_ym19_1_1464821453539_4306" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4305">diameter with a 1/2" thick plug of fiberglass in it. You could then</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4251" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4252">have your transmitting / receiving equipment inside the sub shooting through that</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4278" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4277">fiberglass port. Otherwise mount it external. One problem I can see is battery range,</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4317" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4316">so you would possibly need a through hull cable supplying power to the unit.</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4328" dir="ltr"><span id="yui_3_16_0_ym19_1_1464821453539_4379">Cheers Alan</span></div><div id="yui_3_16_0_ym19_1_1464821453539_4279" dir="ltr"><span></span><br></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1464821453539_4162"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1464821453539_4110" style="display: block;"> <div id="yui_3_16_0_ym19_1_1464821453539_4109" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1464821453539_4108" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1464821453539_4107" dir="ltr"> <font id="yui_3_16_0_ym19_1_1464821453539_4106" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym19_1_1464821453539_4165"> <b><span style="font-weight: bold;">From:</span></b> Antoine Delafargue via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, June 2, 2016 7:40 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] acoustic pinger frequency choice<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1464821453539_4174"><br><div id="yiv9486120758"><div id="yui_3_16_0_ym19_1_1464821453539_4176" dir="ltr">Hello all, <div id="yui_3_16_0_ym19_1_1464821453539_4196">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.</div><div id="yui_3_16_0_ym19_1_1464821453539_4175">A youtube hearing test shows me I cant hear frequencies beyond 14kHz... so I am aiming for 16kHz</div><div><br></div><div>Have any of you had experience with these low frequencies <16kHz in a sub? <br></div><div><br></div><div>regards</div><div>Antoine</div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></body></html>