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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cave Radio Paths:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I think we have an idea on how to do all the PATHS so that the transition between cave HOP7-7 to a WIDE2-2 above ground is possible. The description is about 50% down my <a href="http://aprs.org/cave-link.html">http://aprs.org/cave-link.html</a> page. It uses the TRAPPING capability of the UIDIGI Aliases to truncate HOPn-N paths from going topside while continuing with the remaining WIDE2-2 topside.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img border="0" width="481" height="363" id="Picture_x0020_2" src="cid:image002.png@01CDEDC7.0199E4B0"></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The cavers use the path of HOP7-7,WIDE2-2.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The cave digi below a vertical link has the callsign of VERT.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The topside digi for that vertical link has the callsign of TOP</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The TOP side digi has callsign-substitution (UIDIGI) aliases of HOP7-3,7-2,7-1 so that it traps these and forwards only “TOP*,WIDE2-2”. It also traps 7-7 so cavers wandering around topside can also make it without changing paths.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The VERT digi in the cave has UIDIGI aliases of HOP7-7,7-6,7-5, 7-4 so that it traps the others. Its remaining path of VERT*,WIDE2-2 then gets decremented at the TOP to VERT*,TOP*,WIDE2-1. So as long as there is an IGATE within one digi hop beyond the TOPside digi, then we have APRS-IS communications independent of where the caver is out to CAVE7 without any more QRM than 2 hops topside.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If we actually want to extend this to 14 hops in the cave, then those DX cavers once they get beyond the CAVE6 digi can switch to H77,H77,W22. Here is what I think this longer path will look like topside for each case:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At VERT out to CAVE3: VERT*,TOP*,W2-2 - Works Topside</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At CAVE4 & 5: TOP*,H7-N,WIDE2-2 - Fails topside due to unused H7-N</span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At CAVE6 to 10: HOP7*,VERT*,WIDE2-1 - works topside</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At CAVE11 to 12: HOP7*,TOP*,WIDE2-2 - works topside</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At CAVE13 : HOP7*,HOP7*,WIDE2-1 - Works Topside</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">At CAVE14: HOP7*,HOP7*,WIDE2* - Works if IGate can hear TOP direct</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">SUMMARY:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">PATH: 77,22 works from T, V, 1,2,3,4,5,6 with at least W2-1 to go</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">PATH: 77,77,22 works at V,1,2,3,4, x,x,7,8,9,10,11,12,13,14</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So for perfect coverage, cavers should only transition to 77,77,22 only beyond 7. But since they can see on a D72 what digi heard them, then they can know when to change.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Anyone topside can reach any caver with the EXACT path to get to the TOP digi plus H7-7,H7-7 remaining</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">We might be able to add an additional UIDIG trap in some of the CAVEN digis to solve the CAVE4 & 5 problem, but my head hurts to much to figure it out right now..</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Anyway, at least for 7 hops to the nearest VERtical digi, we have a working plan for transitioning from below ground into the APRS-IS without any additional topside QRM and without any caver changing paths. And out to 14 if they will change..</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Of course, using digis with PREMPTIVE digipeating solves all these problems.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So, planning is still proceeding for the 2-3 March Mammoth Cave Radio test.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Bob, Wb4APR</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p>
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