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<DIV><FONT size=2 face=Arial>Could you please tell us</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>1. GPS</FONT></DIV>
<DIV><FONT size=2 face=Arial>2. Power</FONT></DIV>
<DIV><FONT size=2 face=Arial>3. TX power </FONT></DIV>
<DIV><FONT size=2 face=Arial>4. TX rate</FONT></DIV>
<DIV><FONT size=2 face=Arial>5. PATH </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>- Andrew VK4TEC - </FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=wa8lmf2@aol.com href="mailto:wa8lmf2@aol.com">Stephen H. Smith</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=aprssig@tapr.org
href="mailto:aprssig@tapr.org">TAPR APRS Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, March 13, 2011 5:41
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [aprssig] Final Web Page for
AE0SS-11 and KC0YA-11 Balloon Launch Up -- APRS-IS Problems</DIV>
<DIV><BR></DIV><FONT face=Arial>The dual launch announced earlier is
over. The final summary page is now on my website
at:<BR><BR> <A class=moz-txt-link-rfc2396E
href="http://wa8lmf.net/LiveTrack>"><http://wa8lmf.net/LiveTrack></A><BR><BR>Major
APRS-IS issues were evident <BR><BR></FONT>
<P><FONT face=Verdana>The actual downlink for APRS data from the balloons to
the ground was on a private channel, that was then retransmitted on the usual
144.39 frequency to find it's way to igates and the APRS-IS </FONT><FONT
face=Verdana>(APRS Internet System)</FONT><FONT face=Verdana>.</FONT></P>
<P><FONT face=Verdana>Tracking of these launches were marred by
severely-delayed packets being injected into the APRS-IS. This causes
more recently reported data to be superseded by older data. The result is
tracks that "hyper-jump" forward-backward-forward-backward.
In the case of aerial vehicles like balloon, they also bounce up and
down in altitude. (Note the "grass" of vertical jumps on the
AE0SS-11 vertical profile graph, and the hiccups on both
profiles.) </FONT> </P>
<P><FONT face=Verdana>Delays in passing packets from the TNC to the attached
computer is a known bug in KPC3+ TNCs operated in KISS mode connected to a
computer. The problem appears randomly after several days or weeks of
operation, and can be cleared by issuing the RESET command to the TNC or by
cycling it's power OFF and then back ON. This problem primarily
affects home digi/igate stations, since they typically use a
computer-based setup. It does not affect KPC3+ TNCs operating in
stand-alone mode, as would be the case with most remotely located
digipeaters. </FONT></P>
<P><FONT face=Verdana>Further, these launches were marred by
one or more TNCs at digipeater or igate sites operating in PASSALL mode
(a.k.a. "junque" mode). Numerous posits with impossible values were passed
including elevations hundreds of feet below sea level, wild
hyper-jumps 100s of miles at right-angles to the track path, and multiple
corrupted versions of the two balloons' callsigns.</FONT></P>
<P><FONT face=Verdana>The tracks were further confused by the balloon trackers
apparently being powered up (for a test??) on the south side of the Denver
metro area, before being taken to the launch site. Or were these posits sent
before the GPS receivers achieved lock at the launch site?<BR></FONT></P>
<P><FONT face=Verdana><BR></FONT></P>
<HR SIZE=2 width="100%">
<BR>--<BR><BR>Stephen H. Smith wa8lmf (at) aol.com
<BR>EchoLink Node: WA8LMF or
14400 [Think bottom of the 2M
band]<BR>Skype: WA8LMF<BR>Home
Page: <A
class=moz-txt-link-freetext
href="http://wa8lmf.net">http://wa8lmf.net</A><BR><BR>===== Vista &
Win7 Install Issues for UI-View and Precision Mapping
=====<BR> <A class=moz-txt-link-freetext
href="http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7">http://wa8lmf.net/aprs/UIview_Notes.htm#VistaWin7</A><BR><BR>***
HF APRS over PSK63 ***<BR> <A class=moz-txt-link-freetext
href="http://wa8lmf.net/APRS_PSK63/index.htm">http://wa8lmf.net/APRS_PSK63/index.htm</A><BR><BR>"APRS
101" Explanation of APRS Path Selection & Digipeating <BR> <A
class=moz-txt-link-freetext
href="http://wa8lmf.net/DigiPaths">http://wa8lmf.net/DigiPaths</A>
<BR><BR><BR>
<P><FONT face=Verdana><BR></FONT></P><BR>
<P>
<HR>
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