<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><FONT size="2" style="font-family: Arial, sans-serif;">Tim,</FONT><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"> I've already had a lengthy discussion about that very question, the answer is that they would not interfere with one another and just see what they would normally see. They only see their own sound waves. </FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif">Brian</FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT></DIV><DIV style=""><FONT size="2" style=""><FONT face="Arial, sans-serif"><BR></FONT></FONT><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">--- personal_submersibles@psubs.org wrote:</SPAN><BR><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">From: T Novak via Personal_Submersibles <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">To: "'Personal Submersibles General Discussion'" <personal_submersibles@psubs.org></SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Subject: Re: [PSUBS-MAILIST] passive sonar</SPAN><BR><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">Date: Sat, 18 May 2019 12:23:41 -0700</SPAN><BR><BR><DIV style="font-family: Arial, sans-serif; font-size: 10pt;"><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Brian,</SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Since you are depending on the surface vessel to see you with its equipment there may not be much that you can do. Most fish finders would likely paint your shape proud off the bottom, and maybe as a big fish while in the water column. Unless other have had experience with that scenario, trials would answer those questions.</SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> </SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">It would be interesting to see how an upward pointing transducer on your sub would be detected and painted by a surface based depth sounder. Would your signal not "jam" the other's display? It's worth a try.</SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Tim</SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> </SPAN></P><P><B><SPAN lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</SPAN></B><SPAN lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <B>On Behalf Of </B>Brian Cox via Personal_Submersibles<BR><B>Sent:</B> Saturday, May 18, 2019 10:26 AM<BR><B>To:</B> Personal Submersibles General Discussion <personal_submersibles@psubs.org><BR><B>Subject:</B> Re: [PSUBS-MAILIST] passive sonar</SPAN></P><P></P> <P></P><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif">Tim, </SPAN></P><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> Yes that's the idea. On my Garmin depth finder there is an optional screen which is simply stationary screen and then there is the screen that is moving , which gives you a "history" of the last few seconds of scanning . But it would be interesting to play around with the detect ability of something like that. Not sure how practical it would ultimately be. </SPAN></P></DIV><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> </SPAN></P></DIV><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif">Brian</SPAN></P></DIV><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> </SPAN></P></DIV><DIV><P style="margin-bottom:12.0pt"><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> <BR><BR>--- <A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A> wrote:<BR><BR>From: T Novak via Personal_Submersibles <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>To: "'Personal Submersibles General Discussion'" <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR>Subject: Re: [PSUBS-MAILIST] passive sonar<BR>Date: Sat, 18 May 2019 07:15:35 -0700</SPAN></P><DIV><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Brian,</SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">What are you trying to do with the "passive sonar" that you are considering? Are you wanting to make your submarine more easily detectable by a surface boat with a depth sounder?</SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Tim</SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><P><SPAN style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"> </SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><P><B><SPAN lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</SPAN></B><SPAN lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Personal_Submersibles [<A href="mailto:personal_submersibles-bounces@psubs.org">mailto:personal_submersibles-bounces@psubs.org</A>] <B>On Behalf Of </B>Brian Cox via Personal_Submersibles<BR><B>Sent:</B> Friday, May 17, 2019 8:35 PM<BR><B>To:</B> PSubs <<A href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>><BR><B>Subject:</B> [PSUBS-MAILIST] passive sonar</SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> </SPAN></P><DIV><P><SPAN style="font-size:13.5pt;font-family:"Arial",sans-serif"> I've been thinking about some sort of pinger locator for my sub. I may get a commercially available one just as an extra safety measure, but in the mean time I was playing around with my depth finder on my sailboat . I was thinking if I had a rotating disk that would be a little higher than the sub the changing surface exposure to the sonar waves would appear on the depth finder as a recurring blip . I tried it with a radar reflector that I have, I tied it to a line and located it just below my transducer, I was able to move it around and observe the display on the screen. Since the radar reflector ( used on boats so big ships can see you) has all these sides to it, as I moved it around it would show up intermittently since the sound wave sometimes would not bounce back. I think a flat surface rotated so only the edge is showing and then a large surface was showing at a regular intervals could work as an indicator. I might be especially valuable if you were blending into the bottom so much as to not be detectable . That way someone with just an ordinary depth finder could detect you. </SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"></SPAN></P><DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> </SPAN></P></DIV><DIV><P><SPAN style="font-size:13.5pt;font-family:"Arial",sans-serif">Brian </SPAN><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif"> </SPAN></P></DIV></DIV></DIV><P><SPAN style="font-size:10.0pt;font-family:"Arial",sans-serif">_______________________________________________ Personal_Submersibles mailing list <A>Personal_Submersibles@psubs.org</A> <A href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A> </SPAN></P></DIV></DIV></DIV><SPAN style="font-family: Arial, sans-serif; font-size: 10pt;">_______________________________________________
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