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<DIV><FONT size=2 face=Arial><A
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<DIV><FONT size=2 face=Arial>SBS-1</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=king.robert.j@gmail.com href="mailto:king.robert.j@gmail.com">Jeff
King</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> Thursday, July 02, 2009 7:45
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [aprssig] PPM APRS</DIV>
<DIV><BR></DIV>
<DIV>Andrew:</DIV>
<DIV> </DIV>
<DIV>Do you have any good web links that explain Mode S/ADS-B, the tech specs,
formats etc?</DIV>
<DIV> </DIV>
<DIV>What kind of reciever are you using.</DIV>
<DIV> </DIV>
<DIV>Thanks</DIV>
<DIV> </DIV>
<DIV>Jeff N4864S<BR><BR></DIV>
<DIV class=gmail_quote>On Wed, Jul 1, 2009 at 5:12 PM, Andrew Rich <SPAN
dir=ltr><<A
href="mailto:vk4tec@tech-software.net">vk4tec@tech-software.net</A>></SPAN>
wrote:<BR>
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class=gmail_quote>
<DIV bgcolor="#ffffff">
<DIV><FONT size=2 face=Arial>There are heaps of cheap video tx modules
around.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Is there any reason why they can't be
PulsePositionModulated ? </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Should be enough bandwidth </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I have been looking closely at MODE S aircraft
signals - 1 MB at 8MHz bandwidth</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Sounds like a click. Sends
position</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Also been looking at AIS - 9600 self organising
GMSK. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Maybe good ole 1200 baud will be a round for a
while.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I have been using radio modules - 19k2 on air -
100 mW beef up to 30 watts.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Andrew</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2
face=Arial></FONT> </DIV></DIV><BR>_______________________________________________<BR>aprssig
mailing list<BR><A href="mailto:aprssig@tapr.org">aprssig@tapr.org</A><BR><A
href="https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig"
target=_blank>https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig</A><BR><BR></BLOCKQUOTE></DIV><BR>
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