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Hi Bernard,<br>
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That paper was specifically about DATV using the DVB-S standard with MPEG-2. At the time it was written that was state of the art. Allot has changed since then. More importantly, other than using a DVB standard, the P-4 transponder is completely different.
In theory it can be scaled to much lower bandwidth (and cost) at the expense of reducing the number of simultaneous users. That may introduce other problems like minimum symbol rate support on some commercial chip sets etc. This project is ground breaking
in the amateur community and even the commercial world is still in the early adoption phases of on board processing. Hopefully we can attract attention to our work enough to maybe get a hosted payload opportunity. It's a longshot but worth the effort.<br>
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Howie AB2S<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ground-Station <ground-station-bounces@lists.openresearch.institute> on behalf of KC9SGV via Ground-Station <ground-station@lists.openresearch.institute><br>
<b>Sent:</b> Saturday, August 24, 2019 8:49:17 AM<br>
<b>To:</b> Ground Station <ground-station@lists.openresearch.institute><br>
<b>Subject:</b> [Ground-station] DVB-S2 or -X bandwidth ?</font>
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<div class="PlainText">Hi All, <br>
Is 1 MHz wide enough for DVB-S2 transmissions ?<br>
I cannot attach a picture here, but look on page 17 of this old TAPR paper.<br>
Seems like 2 MHz is the minimum bandwidth required ?<br>
<br>
<a href="https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.tapr.org%2Fpdf%2FDCC2009-DATV-KB6CJZ-W6HHC.pdf&data=02%7C01%7C%7Cfa6788c7d5de4d541c4708d728924828%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637022481068717530&sdata=6kIEqW0sC04%2FlpA7E8cDnNqRppMjks7Jm1JLQcNO0P0%3D&reserved=0">https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.tapr.org%2Fpdf%2FDCC2009-DATV-KB6CJZ-W6HHC.pdf&data=02%7C01%7C%7Cfa6788c7d5de4d541c4708d728924828%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637022481068717530&sdata=6kIEqW0sC04%2FlpA7E8cDnNqRppMjks7Jm1JLQcNO0P0%3D&reserved=0</a><br>
<br>
Maybe only legacy ham Linear modes will be supported by our 1 MHz Rent-a- GEO effort ?<br>
<br>
Bernard,<br>
KC9SGV<br>
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Sent from my iPad<br>
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