PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2007-07-31 NOTE = " E-mail and other messages concerning MGS Radio Science on or about 2002/275." END_OBJECT = TEXT END From aseel@airmail.fltops.jpl.nasa.gov Wed Oct 2 16:27:10 2002 Received: from thorn.fltops.jpl.nasa.gov (thorn.fltops.jpl.nasa.gov [137.228.90.10]) by magellan.stanford.edu (8.11.6/8.11.6) with SMTP id g92DKq416535; Wed, 2 Oct 2002 06:20:52 -0700 (PDT) Received: by thorn.fltops.jpl.nasa.gov; id GAA17842; Wed, 2 Oct 2002 06:21:09 -0700 Received: from airmail1.fltops.jpl.nasa.gov(137.228.96.26) by thorn.fltops.jpl.nasa.gov via smap (V4.2) id xma017778; Wed, 2 Oct 02 06:20:19 -0700 Received: from rsops2.fltops.jpl.nasa.gov (rsops2.fltops.jpl.nasa.gov [137.228.136.22]) by airmail1.fltops.jpl.nasa.gov (Postfix) with ESMTP id DDBEA15D2; Wed, 2 Oct 2002 06:19:21 -0700 (PDT) Received: (from aseel@localhost) by rsops2.fltops.jpl.nasa.gov (8.10.2+Sun/8.10.2) id g92DK4g11118; Wed, 2 Oct 2002 13:20:04 GMT Date: Wed, 2 Oct 2002 13:20:04 GMT From: aseel anabtawi Message-Id: <200210021320.g92DK4g11118@rsops2.fltops.jpl.nasa.gov> Content-Type: text To: undisclosed-recipients:;;@fltops.jpl.nasa.gov Content-Length: 912 DSS: 65 RSR: RSR2A Subchannel: 1 Orbit Number: 15944 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-06:10:00 End Record: 2002/275-06:20:00 DSS: 65 RSR: RSR2A Subchannel: 1 Orbit Number: 15945 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-08:07:00 End Record: 2002/275-08:17:00 DSS: 65 RSR: RSR2A Subchannel: 1 Orbit Number: 15946 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-10:05:00 End Record: 2002/275-10:15:00 DSS: 65 RSR: RSR2A Subchannel: 1 Orbit Number: 15947 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-12:03:00 End Record: 2002/275-12:13:00 -------------------------------------------------------------------------- From aseel@airmail.fltops.jpl.nasa.gov Thu Oct 3 01:57:21 2002 Received: from thorn.fltops.jpl.nasa.gov (thorn.fltops.jpl.nasa.gov [137.228.90.10]) by magellan.stanford.edu (8.11.6/8.11.6) with SMTP id g9300q403018; Wed, 2 Oct 2002 17:00:52 -0700 (PDT) Received: by thorn.fltops.jpl.nasa.gov; id RAA22468; Wed, 2 Oct 2002 17:01:10 -0700 Received: from airmail1.fltops.jpl.nasa.gov(137.228.96.26) by thorn.fltops.jpl.nasa.gov via smap (V4.2) id xma022434; Wed, 2 Oct 02 17:00:15 -0700 Received: from rsops2.fltops.jpl.nasa.gov (rsops2.fltops.jpl.nasa.gov [137.228.136.22]) by airmail1.fltops.jpl.nasa.gov (Postfix) with ESMTP id 1757F15D2; Wed, 2 Oct 2002 16:59:16 -0700 (PDT) Received: (from aseel@localhost) by rsops2.fltops.jpl.nasa.gov (8.10.2+Sun/8.10.2) id g93000V11675; Thu, 3 Oct 2002 00:00:00 GMT Date: Thu, 3 Oct 2002 00:00:00 GMT From: aseel anabtawi Message-Id: <200210030000.g93000V11675@rsops2.fltops.jpl.nasa.gov> Content-Type: text To: undisclosed-recipients:;;@fltops.jpl.nasa.gov Content-Length: 1368 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15948 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-14:00:00 End Record: 2002/275-14:10:00 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15949 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-15:58:00 End Record: 2002/275-16:08:00 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15950 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-17:56:00 End Record: 2002/275-18:06:00 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15951 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-19:53:00 End Record: 2002/275-20:03:00 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15952 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-21:51:00 End Record: 2002/275-22:01:00 DSS: 15 RSR: RSR2A Subchannel: 1 Orbit Number: 15953 Occultation Sense: i SOE: mm214c.09.tsoe Ground Mode: 1 Uplink Station: -- Sampling Rate: 2K Bit Resolution: 16 Begin Record: 2002/275-23:49:00 End Record: 2002/275-23:59:00 -------------------------------------------------------------------------- From aseel@godzilla.jpl.nasa.gov Tue Oct 8 16:14:38 2002 Received: from godzilla.jpl.nasa.gov (godzilla.jpl.nasa.gov [137.78.78.95]) by magellan.stanford.edu (8.11.6/8.11.6) with ESMTP id g98NEa429661; Tue, 8 Oct 2002 16:14:37 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by godzilla.jpl.nasa.gov (8.9.3/8.9.3) with SMTP id QAA04347; Tue, 8 Oct 2002 16:14:36 -0700 (PDT) Message-Id: <200210082314.QAA04347@godzilla.jpl.nasa.gov> Date: Tue, 8 Oct 2002 16:14:36 -0700 (PDT) From: Aseel Anabtawi Reply-To: Aseel Anabtawi Subject: Modulation at SPC-10 To: rsimpson@magellan.stanford.edu, joe@nova.stanford.edu, kusza@magellan.stanford.edu Cc: SAbbate@jftl.jpl.nasa.gov MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: X6wBp/66aLyTLB6QrzuTEA== X-Mailer: dtmail 1.2.1 CDE Version 1.2.1 SunOS 5.6 sun4u sparc Content-Length: 1928 Status: RO Hello, The anomalies shown below were listed in recent health reports. How serious is this modulation? Should we ask the station to investigate? Regards, Aseel Data from occultation 15972i collected at DSS 15 (start time 2002/277- 13:05:00) have a +/-0.2 dB 7 second modulation on the free space carrier amplitude for most of the time before ingress. Data collected from DSS 15, occultation 15948i (start time 2002/275-14:00:00) had +/-1 dB sinusoidal modulation on the free-space carrier amplitude with period of ~10 seconds. The modulation was present before telemetry turned off but not noticeable in the noise level after ingress. amplitude over the course of the measurement, with +/-0.3 dB random fluctuations. Data collected from DSS 15 occultation 15924e (start time 2002/273- 13:42:00) had +/-0.7 dB sinusoidal modulation of the carrier amplitude with period of about 10 seconds. There was no modulation of the noise level either before or after the carrier appeared. Data collected from DSS 15 occultation 15924i (start time 2002/273- 14:56:00) may have very small-amplitude modulation of the carrier level (amplitude ~0.1 dB) with a similar ~10 s period. The first measurement collected at DSS 15 (occultation 15936i, start time 2002/274-14:28:00) had +/-0.2 dB modulation on the free-space carrier amplitude with period of about 5 seconds. The first measurement collected on day 272 at DSS 15 (occultaion 15911i, start time 2002/272-13:26:00) had max SNR levels about 1 dB lower than expected. In addition there was a +/-0.5 dB sinusoidal modulation on the free-space carrier amplitude, with period of about 10 seconds. There was no modulation on the carrier before telemetry was turned off or on the noise level. The last measurement collected on day 272 at DSS 15 (occultation 15915i, start time 2002/272-21:16:00) had a +0.5 dB ramp in the free-space carrier -------------------------------------------------------------------------- From rsimpson@magellan.stanford.edu Wed Oct 9 14:54:06 2002 Received: (from rsimpson@localhost) by magellan.stanford.edu (8.11.6/8.11.6) id g99Ls5e07915; Wed, 9 Oct 2002 14:54:05 -0700 (PDT) Date: Wed, 9 Oct 2002 14:54:05 -0700 (PDT) From: Dick Simpson 723-3525 Message-Id: <200210092154.g99Ls5e07915@magellan.stanford.edu> To: aseel@godzilla.jpl.nasa.gov, joe@nova.stanford.edu, kusza@magellan.stanford.edu, rsimpson@magellan.stanford.edu Subject: Re: Modulation at SPC-10 Cc: SAbbate@jftl.jpl.nasa.gov Content-Length: 1461 Status: R >15972i 2002/277-13:05:00 >15948i 2002/275-14:00:00 >15924e 2002/273-13:42:00 >15924i 2002/273-14:56:00 >15936i 2002/274-14:28:00 >15911i 2002/272-13:26:00 All of these were early in the pass; in only one case was there an earlier occultation without a problem reported. And in that case I looked up the plot and it DOES show modulation; it just wasn't reported because the modulation on the second occultation was much worse. The behavior would be consistent with erratic tracking of the ground antenna (overlapping coverage from DSS 65 in some of the cases shows no modulation). I thought about CONSCAN; I see MSPA (and therefore possible unexpected CONSCAN?) only on the DSN schedule for day 274. >The anomalies shown below were listed in recent health reports. >How serious is this modulation? Should we ask the station to >investigate? I think it's serious enough to look into. If you want the plots, they are on magellan:/users/z00/BRO; or I can send you hard copies. >The last measurement collected on day 272 at DSS 15 (occultation 15915i, >start time 2002/272-21:16:00) had a +0.5 dB ramp in the free-space >carrier. This is presumably something different. Including it will only confuse matters. Let's concentrate on the quasi-sinusoidal modulation. Thanks for picking up this pattern. With Kerri in and out, I've not been following this closely enough to notice; and she may not have been either. Dick -------------------------------------------------------------------------- From joe@nova.stanford.edu Tue Oct 29 21:14:11 2002 Received: from nova.Stanford.EDU (nova [171.64.90.123]) by magellan.stanford.edu (8.11.6/8.11.6) with ESMTP id g9U5EAs15508 for ; Tue, 29 Oct 2002 21:14:10 -0800 (PST) Received: from neptune.Stanford.EDU (neptune.Stanford.EDU [171.64.90.149]) by nova.Stanford.EDU (8.9.3/8.9.3) with ESMTP id VAA06533; Tue, 29 Oct 2002 21:14:14 -0800 (PST) Received: from neptune.Stanford.EDU (joe@localhost) by neptune.Stanford.EDU (8.11.6/8.11.6) with ESMTP id g9U5ED505231; Tue, 29 Oct 2002 21:14:13 -0800 (PST) Message-Id: <200210300514.g9U5ED505231@neptune.Stanford.EDU> X-Authentication-Warning: neptune.Stanford.EDU: joe owned process doing -bs X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 From: Joe Twicken To: hinson@nova.stanford.edu, joe@nova.stanford.edu, rsimpson@nova.stanford.edu Subject: Re: RSR Notice: /users/z08/procRSR/23021840 In-reply-to: Your message of "Tue, 29 Oct 2002 11:06:25 PST." <200210291906.g9TJ6Px27963@magellan.stanford.edu> References: <200210291906.g9TJ6Px27963@magellan.stanford.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 29 Oct 2002 21:14:12 -0800 Content-Length: 1317 Status: RO (1) The 22751756.RSR recording is slightly clipped (2) There was no HGA motion compensation for these recordings >22750610.RSR p 65XR1IRXN101 65XR1IC1XX01 65XR1IF1S101 65XR1IS1T101 65XR1IS1T201 65XR1IS1T301 65XR1IS1T401 65XR1IS1T501 >22750807.RSR p 65XR1IRXN101 65XR1IC1XX01 65XR1IF1S101 65XR1IS1T101 65XR1IS1T201 65XR1IS1T301 65XR1IS1T401 65XR1IS1T501 >22751005.RSR p 65XR1IRXN101 65XR1IC1XX01 65XR1IF1S101 65XR1IS1T101 65XR1IS1T201 65XR1IS1T301 65XR1IS1T401 65XR1IS1T501 >22751203.RSR p 65XR1IRXN101 65XR1IC1XX01 65XR1IF1S101 65XR1IS1T101 65XR1IS1T201 65XR1IS1T301 65XR1IS1T401 65XR1IS1T501 >22751400.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 >22751558.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 >22751756.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 >22751953.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 >22752151.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 >22752349.RSR p 15XR1IRXN101 15XR1IC1XX01 15XR1IF1S101 15XR1IS1T101 15XR1IS1T201 15XR1IS1T301 15XR1IS1T401 15XR1IS1T501 -------------------------------------------------------------------------- From aseel@godzilla.jpl.nasa.gov Tue Oct 22 11:44:54 2002 Received: from godzilla.jpl.nasa.gov (godzilla.jpl.nasa.gov [137.78.78.95]) by magellan.stanford.edu (8.11.6/8.11.6) with ESMTP id g9MIios20624; Tue, 22 Oct 2002 11:44:50 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by godzilla.jpl.nasa.gov (8.9.3/8.9.3) with SMTP id LAA22725; Tue, 22 Oct 2002 11:44:49 -0700 (PDT) Message-Id: <200210221844.LAA22725@godzilla.jpl.nasa.gov> Date: Tue, 22 Oct 2002 11:44:49 -0700 (PDT) From: Aseel Anabtawi Reply-To: Aseel Anabtawi Subject: Response From SPC-10 To: rsimpson@magellan.stanford.edu, joe@nova.stanford.edu, kusza@magellan.stanford.edu MIME-Version: 1.0 Content-Type: MULTIPART/mixed; BOUNDARY=Convocation_of_Eagles_593_000 X-Mailer: dtmail 1.2.1 CDE Version 1.2.1 SunOS 5.6 sun4u sparc Content-Length: 530625 Status: O --Convocation_of_Eagles_593_000 Content-Type: TEXT/plain; charset=us-ascii Content-MD5: uCiHkgzY9rETAee+b4nRIg== Hello, Two emails are attached below. They are from SPC-10 in response to our request to investigate the modulation anomaly. Regards, Aseel ------------- Begin Forwarded Message ------------- -------------------------------------------------------------------------- From: "Abbate, Salvatore F" To: "Anabtawi, Aseel" Subject: FW: MGS Radio Science Anomalies at SPC-10 Date: Tue, 22 Oct 2002 09:24:08 -0700 MIME-Version: 1.0 Hi Aseel FYI Sal -----Original Message----- From: Bracamonte, Larry H Sent: Friday, October 18, 2002 12:29 PM To: Abbate, Salvatore F Subject: RE: MGS Radio Science Anomalies at SPC-10 Sal, Mike Wert provided a utility program to assist in fault isolation. The intermittent variations are believed to be caused by antenna pointing problems. Bob Haroldsson intends to work on it during the next available maintenance period, Thursday October 24th. ------------- End Forwarded Message ------------- ------------- Begin Forwarded Message ------------- -------------------------------------------------------------------------- From: "Abbate, Salvatore F" To: "Anabtawi, Aseel" Subject: FW: Gain Variation During Recent DSS15 MGS Occultation Radio Scie nce Date: Wed, 16 Oct 2002 09:05:20 -0700 Hi Aseel Problem may be in the antenna Sal > -----Original Message----- > From: Wert, Michael > Sent: Tuesday, October 15, 2002 8:07 PM > To: Bracamonte, Larry H > Cc: Abbate, Salvatore F; Almassy, William T; Haroldsson, Robert; Hurley, > Dale R > Subject: Gain Variation During Recent DSS15 MGS Occultation Radio > Science > > Larry, > > After your call today I extracted the NMC logs for two of the passes you > said had seen gain variations as large as 1 dB (p-p). Although the APA > only reports encoder readings every 5 minutes, I believe I was still able > to identify the cause of large pointing fluctuations that correlate with > times you reported as having problems. Please refer to the first two > figures in the attached Excel spreadsheet: > <> > The elevation servo error has large "excursions" near 1400 on 02/275 > (October 2) and 1510 on 02/277 (October 4). The yellow squares at the top > of each chart show where the ASC reported in the log that the elevation > encoder reading was invalid. The tolerance for declaring the reading > invalid is when the encoder is more than a "settable" value from an > estimated reading; the normal, default tolerance is set to 0.050 degrees. > Note that there are times -- particularly 277/15:13:00 -- where a reading > appears to be invalid but may have been wrong by less than 0.05 degrees > and was not alarmed by the ASC. The red triangles at the top of each > chart show where the ASC reported that enough encoder validity problems > were detected consecutively that it was using the estimator for antenna > elevation position instead of the encoder. > The third figure shows the elevations at which the elevation problems > occurred. > > When the encoder problems are occurring, they are appearing in the log at > multiples of 24 second intervals. The elevation rate near the problems is > about 1 deg per 5 minutes. The problem appears to repeat with clocking > through the 2^(-14) bit of the encoder -- the 0.088 deg bit. Since the > elevation transducer itself produces a binary output, I cannot discern > whether the problem is in the transducer, the data converter, or the > parallel input card in the ASC computer itself. Bob Haroldsson will need > to isolate the problem further. > > As I mentioned on the phone, the antenna encoder readings are available as > serial ASCII data on the line between the ACS and the APA. A passive, > monitor-only (i.e. only connect the RD and SG pins to a PC), computer can > record the encoder at one reading per second. Any ASCII logging program > can be used. To log the data in a more easily recoverable format, the > following DOS-compatible program can be used: > <> > > Regards, > > Michael Wert, Supervisor > Antenna Controls Group > CSOC Hardware Engineering > JPL / DSN Site (626)584-4687 > > > > > From jtwicken@stanford.edu Thu May 1 20:55:18 2003 Received: from nova.Stanford.EDU (IDENT:nZ+0BRpYrBZ7j59/7mZxNuhDIQTMFiUE@nova [171.64.90.123]) by magellan.stanford.edu (8.11.6/8.11.6) with ESMTP id h423tId09026 for ; Thu, 1 May 2003 20:55:18 -0700 (PDT) Received: from neptune.Stanford.EDU (neptune.Stanford.EDU [171.64.90.149]) by nova.Stanford.EDU (8.12.8/8.12.8) with ESMTP id h423sSb7015407; Thu, 1 May 2003 20:54:48 -0700 Received: from neptune.Stanford.EDU (joe@localhost) by neptune.Stanford.EDU (8.11.6/8.11.6) with ESMTP id h423s2l04262; Thu, 1 May 2003 20:54:12 -0700 (PDT) Message-Id: <200305020354.h423s2l04262@neptune.Stanford.EDU> X-Authentication-Warning: neptune.Stanford.EDU: joe owned process doing -bs X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 From: Joe Twicken To: hinson@nova.stanford.edu, joe@nova.stanford.edu, rsimpson@nova.stanford.edu Subject: Re: RSR Notice: /users/z18/procRSR/31211629 In-reply-to: Your message of "Thu, 01 May 2003 09:56:07 PDT." <200305011656.h41Gu7T19817@magellan.stanford.edu> References: <200305011656.h41Gu7T19817@magellan.stanford.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 01 May 2003 20:54:02 -0700 Content-Length: 1358 Status: RO (1) Reprocessed with Goddard trajectory (2) The 22751756.RSR recording is slightly clipped (3) There was no HGA motion compensation for these recordings >22750610.RSR p 65XR1IRXN102 65XR1IC1XX02 65XR1IF1S102 65XR1IS1T102 65XR1IS1T202 65XR1IS1T302 65XR1IS1T402 65XR1IS1T502 >22750807.RSR p 65XR1IRXN102 65XR1IC1XX02 65XR1IF1S102 65XR1IS1T102 65XR1IS1T202 65XR1IS1T302 65XR1IS1T402 65XR1IS1T502 >22751005.RSR p 65XR1IRXN102 65XR1IC1XX02 65XR1IF1S102 65XR1IS1T102 65XR1IS1T202 65XR1IS1T302 65XR1IS1T402 65XR1IS1T502 >22751203.RSR p 65XR1IRXN102 65XR1IC1XX02 65XR1IF1S102 65XR1IS1T102 65XR1IS1T202 65XR1IS1T302 65XR1IS1T402 65XR1IS1T502 >22751400.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502 >22751558.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502 >22751756.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502 >22751953.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502 >22752151.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502 >22752349.RSR p 15XR1IRXN102 15XR1IC1XX02 15XR1IF1S102 15XR1IS1T102 15XR1IS1T202 15XR1IS1T302 15XR1IS1T402 15XR1IS1T502