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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Tony<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I was planning on adding exactly this into my Trackuino code. It already has profile switching above a specified altitude (5000 feet around Saskatoon or 8000 if GPSL goes back to Denver) I was also going to add an additional switch on descent that would beacon with a single hop at a rate of every 10 seconds for the last 1000 or so feet of descent. We would include one hop because we set all of our vehicle trackers as fill-in digipeaters once we get outside the existing digipeater coverage. I also plan to tell it to go back to once a minute after is senses the GPS isn’t descending any more.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>As you know, those of us in the prairies hardly don’t need a radar altimeter to know the altitude of the ground. ;-)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>73, Bruce – VE5BNC<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SABRE<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> aprssig-bounces@tapr.org [mailto:aprssig-bounces@tapr.org] <b>On Behalf Of </b>Tony VE6MVP<br><b>Sent:</b> Monday, March 17, 2014 1:35 PM<br><b>To:</b> TAPR APRS Mailing List<br><b>Subject:</b> [aprssig] Balloon profile switching<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>At 07:18 PM 2014-03-16, Keith VE7GDH wrote:<br>>The exception <br>>would be devices that are capable of doing profile switching… changing <br>>the path above a certain altitude and changing again on the way back <br>>down. For high altitude balloons, no path is needed at all when there <br>>at the edge of space. It's only at the start and end of the flight <br>>that any path is needed.<br><br>I'm wondering if is needed. However before I dig myself into a hole what is the descent rate of a balloon at lower altitudes and the standard balloon beaconing interval?<br><br>I'm thinking that the last transmission an igate would receive would be when the balloon is at, guessing, 600' above the ground. How far horizontally is the collapsed balloon going to travel in that 600'?<br><br>In an ideal world the balloon should be beaconing relatively rapidly the last 500' before it hits the ground. But I suspect that a ground radar altimeter isn't generally include in amateur radio balloon launches. <smile><br><br>Tony<o:p></o:p></p></div></body></html>