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</o:shapelayout></xml><![endif]--></head><body lang=PT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>FM interference to Linear Transponder Satellites<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>To an FM operator, 145.8-146.0 MHz may seem to be empty, it is not! These frequencies are used by weak signal SSB/CW satellite transponders and even a few watts of FM can cause severe interference.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Some FM operators are unaware that if they use these frequencies their local chat across town will be heard thousands of km away and, in doing so, will block the satellite.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Alexandru Csete OZ9AEC made this recording on Saturday, May 5, 2012 using the AMSAT-UK FUNcube Dongle and Gqrx SDR. It shows very strong FM transmissions on the FO-29 linear transponder which could be from Spain or Portugal. The topic appears to be chocolate. Alexandru says – If you know who these people are, be sure to send them a QSL card!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The use of FM on an SSB/CW linear transponder satellite reduces the lifetime of both the batteries and the transponder itself.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Watch FM Interference on FO-29 amateur radio satellite<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://www.youtube.com/embed/X1hIfKSIyOI?rel=0">http://www.youtube.com/embed/X1hIfKSIyOI?rel=0</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Alex OZ9AEC has previously reported interference on the HO-68 linear transponder, see<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://www.oz9aec.net/index.php/communications/401-interference-on-ho68-linear-transponder">http://www.oz9aec.net/index.php/communications/401-interference-on-ho68-linear-transponder</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>How to work the SSB amateur radio satellites<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://www.uk.amsat.org/2712">http://www.uk.amsat.org/2712</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>AMSAT-UK FUNcube Yahoo Group<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="http://groups.yahoo.com/group/FUNcube">http://groups.yahoo.com/group/FUNcube</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>