<p dir="ltr">Agreed. From what I have read d-star is a lot like the UDP network protocol where it is transmit and forget there is no handshaking / error correction built in. It is up to the application developer to handle error correction and the d-rats package does perform some level of error correction.</p>
<p dir="ltr">Dan Metcalf - KB3UUN.</p>
<div class="gmail_quote">On Sep 20, 2013 3:54 PM, "John Davis" <<a href="mailto:jdavis@gtworks.com">jdavis@gtworks.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My understanding is that the low speed data channel does NOT have error correction, however, D-RATS offers Error correction in Message and File Transfer modes
where it is most important.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">John WB4QDX<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> <a href="mailto:drats_users-bounces@intrepid.danplanet.com" target="_blank">drats_users-bounces@intrepid.danplanet.com</a> [mailto:<a href="mailto:drats_users-bounces@intrepid.danplanet.com" target="_blank">drats_users-bounces@intrepid.danplanet.com</a>]
<b>On Behalf Of </b>Dave Welker<br>
<b>Sent:</b> Friday, September 20, 2013 3:19 PM<br>
<b>To:</b> D-Rats Mailing List<br>
<b>Subject:</b> [drats_users] ERROR Correction in slow speed data<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">Hello all,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">Can anyone confirm if the D-RATS slow speed data has FEC (Forward Error Correction) built in now or not?</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">I understand that D-STAR voice does have error correction built in. I've checked on the D-RATS home page/documentation</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">which is a August 2009 reference.</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">This is what I found in this document Under users manual/files: Is this still current information?</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px">
<strong><span style="font-family:"Verdana","sans-serif";color:#666666">Unlike the D-STAR DV Voice Channel, which has error correction built into the protocol, the Data Sub-channel has no error correction.
</span></strong><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666"><u></u><u></u></span></p>
<p style="margin:0in;margin-bottom:.0001pt;line-height:11.25pt;background:white;word-spacing:0px">
<span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666"> <u></u><u></u></span></p>
<p style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px">
<strong><span style="font-family:"Verdana","sans-serif";color:#666666">This makes the transfer of data across D-STAR a lot more dependant on a good radio path being established between the two locations wishing to
</span></strong><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666"><u></u><u></u></span></p>
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<span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666"> <u></u><u></u></span></p>
<p style="margin:0in;margin-bottom:.0001pt;background:white;word-spacing:0px">
<strong><span style="font-family:"Verdana","sans-serif";color:#666666">exchange data. D-RATS includes the ability to test connectivity between two locations</span></strong><strong><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666">.</span></strong><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666"><u></u><u></u></span></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">Thanks in advance</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">regards</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">Dave</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">W2SRP</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">Goals are where we want to be;<br>
Objectives are the steps to get there.</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Century Gothic","sans-serif"">There are 2 rules to success in life:<br>
1. Don't tell people everything you know.</span><u></u><u></u></p>
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