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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'>We could easily unplug the x-band receiver and see if the birdie goes away. Would Monday be soon enough?<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";color:#1F497D'>Chuck<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><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> evlatests-bounces@nrao.edu [mailto:evlatests-bounces@nrao.edu] <b>On Behalf Of </b>Emmanuel Momjian<br><b>Sent:</b> Thursday, February 10, 2011 5:48 PM<br><b>To:</b> Rick Perley; evlatests@aoc.nrao.edu<br><b>Subject:</b> Re: [evlatests] 36 GHz 'RFI'<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Perhaps it is worth noting that antenna 10 had a couple of internal birdies at Ka-band, and one of them was at 36286 MHz (very close to the frequency that Rick has reported for antenna 22's birdie). See <a href="http://science.nrao.edu/evla/observing/RFI/Ka-Band.shtml">http://science.nrao.edu/evla/observing/RFI/Ka-Band.shtml</a><br><br>The problem on antenna 10 was fixed early October 2010, and I believe the cause was a faulty X-band LNA (Dan and Chuck may elaborate on the details). I am reporting this just in case the problem seen on ea22 has a similar origin to what ea10 had some months ago.<br><br>em<br><br><o:p></o:p></p><div><p class=MsoNormal>On Thu, Feb 10, 2011 at 5:32 PM, Rick Perley <<a href="mailto:rperley@nrao.edu">rperley@nrao.edu</a>> wrote:<o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'> I got some time to look more closely at the 36280 MHz 'birdie'<br>reported on yesterday.<br><br> It is only on antenna 22, in both RCP and LCP, but stronger in the<br>former. It is seen on all baselines between 22 and other antennas, but<br>on no other baselines -- even those comprising adjacent antennas. The<br>strength of the 'line' is much stronger on short baselines to 22 --<br>indicating that fringe winding is operating.<br><br> So this would presumably be an internal signal.<br><br><br>_______________________________________________<br>evlatests mailing list<br><a href="mailto:evlatests@listmgr.cv.nrao.edu">evlatests@listmgr.cv.nrao.edu</a><br><a href="http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests" target="_blank">http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>