From vlbi@asi.it Tue Jul 13 15:16 MES 1999 Received: from geo.mt.asi.it by kuestner.geod.uni-bonn.de with SMTP (1.37.109.6/16.2) id AA19187; Tue, 13 Jul 99 15:16:21 +0200 Return-Path: Received: from pcvlbi.mt.asi.it by geo.mt.asi.it with SMTP (1.40.112.8/16.2) id AA165571360; Tue, 13 Jul 1999 15:09:20 +0200 Message-Id: <000701becd32$65ec5ac0$0dea6ac0@mt.asi.it> Reply-To: "VLBI - ASI/CGS Matera" From: "VLBI - ASI/CGS Matera" To: "Leonid Petrov" References: <199907121506.RAA02950@hp835.mt.asi.it> Subject: R: Spurs at MATERA at 8512.99MHz Date: Tue, 13 Jul 1999 15:19:54 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-Msmail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2014.211 X-Mimeole: Produced By Microsoft MimeOLE V5.00.2014.211 Status: R -----Messaggio Originale----- Da: Leonid Petrov A: Cc: ; ; ; ; Data invio: domenica 11 luglio 1999 17.29 Oggetto: Spurs at MATERA at 8512.99MHz > Dear Dave, > > I don't know why but somehow a fancy came to my head and I looked at plots > of normalized amplitude of phase calibration signal versus its phase for ca062 > experiment ($99MAY18XA). I have to confess that I found very strong spurious > signals at MATERA at the channel #4, frequency 8512.99 MHz. I've put them in > Web and you can get a chance to look at them also: > > http://giub.geod.uni-bonn.de/Mitarbeiter/petrov_docs/discussion/matera.html > > I cannot say that I get pleasure in seeing this picture, I would prefer > to have a strait line there. My interpretation is that the amplitude of > spurious signal jumped during the session. It is not difficult even to detect > when. I didn't notice anything worth to report at other frequencies. > > Being curious, I looked at the next experiment ca063: $99JUN01XA which was > released last week. Spurious signal remained! But picture became more > complicated. Two, three different spurs? The same spur but with different > amplitude? > > What will we do with this plague? > > Leonid > 11-JUL-99 17:28:35 > > Dear Leonid In reference to yuor msg. we checked the interference at channel 4,frequency 8512.99 Mhz.Infact there is a strong interference at IF2 when the antenna has a position Azi=190 ELE=10 that is trasfered to IF1, due to the coupling factor of our Down Converter. REGARDS VLBI TEAM