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</o:shapelayout></xml><![endif]--></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'>While I think this would work fine in a suburban environment (good outdoor antennas, etc.), Dstar is a bit challenging here in the city (multipath, intermod hell). None of the users we have can hear each other, and most do not have external antennas. But we could probably place a mobile at a repeater site and buy some more feed line and another antenna. I think we will try this as soon as 4G launches and the repeater is moved. Although, to me it just seems to be much more simple if a piece of software on the existing repeater gateway could handle it.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Gary KB2BSL<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>The Staten Island Digital Group<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>WG2MSK repeater</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> drats_users-bounces@intrepid.danplanet.com [mailto:drats_users-bounces@intrepid.danplanet.com] <b>On Behalf Of </b>David Swartz<br><b>Sent:</b> Wednesday, August 11, 2010 1:53 PM<br><b>To:</b> drats_users@intrepid.danplanet.com<br><b>Subject:</b> Re: [drats_users] drats_users Digest, Vol 24, Issue 9<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue'>This is a reply to Mike's suggestion about a separate mobile radio to enable the Ratflector on the repeater. </span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue'>We decided to run a separate mobile radio connected to the ratflector on the repeaters frequency to accomplish what he proposed. However we do not run the mobile collocated with the repeater to reduce the potential of RF interference to the repeaters receiver.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'><new paradigm></span> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue'>The obvious architecture for D-Rats/Ratflectors is to have a number of nodes in the field consisting of a simple mobile radio with attached computer connected to the Internet. This network of Ratflectors are then connected to a central regional aggregating Ratflector that has a static known IP address. Internet connected users connect to this central ratflector. The field stations (nodes) announce their availability and frequency by beaconing their presence as a position report. As you travel through an area you connect to this self advertising network of participating stations. If all of these nodes are interconnected then it doesn't matter which node you enter the system at, your transmission will be repeated by all. </span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'>If the node changes IP address it doesn't matter since the Internet connected stations don't connect to it directly. It is the node owners responsibility to maintain the connection to the aggregating ratflector with the static address. Since the nodes all self announce their presence administration is minimal. Unlike existing packet digipeating performance is maintained since each station has only one rf hop with the Internet providing the backbone.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'>Contention with voice users can be minimal because the nodes do not have to operate using the local repeater. The deployment cost is significantly less than building a full repeater system just to transfer data. </span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'>If five hams get together they can build a node with a minimal individual financial outlay and bring D-Rats coverage to their area.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'></new paradigm> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:blue'> </span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'>- Dave Swartz</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'> Repeater Operations</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:blue'> Federal Way Amateur Radio Club.</span><o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div></div></body></html>