PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1999-03-23 NOTE = " E-mail and other messages concerning MGS Radio Science on or about 1997/120." END_OBJECT = TEXT END From john@snug.jpl.nasa.gov Fri May 16 13:41:22 1997 Received: (from john@localhost) by snug.jpl.nasa.gov (8.6.10/8.6.6) id NAA20306; Fri, 16 May 1997 13:41:30 -0700 Date: Fri, 16 May 1997 13:41:30 -0700 From: John Armstrong Message-Id: <199705162041.NAA20306@snug.jpl.nasa.gov> To: rsimpson@magellan.stanford.edu, trish@rodan.jpl.nasa.gov Subject: funny MGS stuff Cc: john@snug.jpl.nasa.gov Status: RO Dear Dick and Trish, I just faxed (to you, Dick) and sent (to you, Trish) some funny looking data taken on MGS (DOY 120 over DSS65). The data show strong periodicities in the amplitude and phase. (The sampling here is 0.5 sec with about a 1 sec time constant on the PLL...aliasing is a possibility.) The RF spectra show funny stuff (low level) off to the side of the carrier and apparently tracking it. (To Dick: Trish and I are putting together a list of funny-stuff-observed, but I thought you might be interested in *this* one--it is "strange in a different way.") Best, John --------------------------------------------------------------------- From trish@rodan.jpl.nasa.gov Wed Jul 9 15:55:49 1997 Received: from rodan.Jpl.Nasa.Gov (rodan.jpl.nasa.gov [128.149.43.24]) by magellan.Stanford.EDU (8.8.5/8.8.3) with ESMTP id PAA06358 for ; Wed, 9 Jul 1997 15:55:49 -0700 (PDT) Received: from 128.149.43.27 (trish-mac.jpl.nasa.gov [128.149.43.27]) by rodan.Jpl.Nasa.Gov (8.8.5/8.6.6) with SMTP id PAA08765; Wed, 9 Jul 1997 15:56:07 -0700 (PDT) Message-Id: <199707092256.PAA08765@rodan.Jpl.Nasa.Gov> Date: 09 Jul 97 15:56:52 -0700 From: Trish Priest Subject: FWD: DSS65 MGS Gravity wave experiment To: John Armstrong , Richard Simpson , Len Tyler X-Mailer: QuickMail Pro 1.0.2d1 X-Priority: 3 Reply-To: Trish Priest Content-Type: text/plain; charset="iso-8859-1" Content-Length: 1507 Status: R Hello, This is a reply to Sal Abbate's question about the periodicity in the GWE data from DSS 65. Dick, please let me know if you see similar periodicity in one-way data from DSS 65. -Trish -------------------------------------- Date: 7/2/97 8:49 AM From: Salvatore F Abbate Sal, Jesus Calvo, Station Analyst, has been reviewing the data plots provided by you on 6-4-97, on the MGS RS gravity wave experiment, together with some antenna engineers. There seems to be a strong correlation between the sinusoidal pattern present in your data plots with some non linearity present at least in the antenna azimuth drive system. Lack of antenna time for testing and troubleshooting makes this analysis enters the waiting queue. If you deem that this phenomenon worths priority attention please try to obtain antenna time, otherwise we would have to use the pool of station maintenance time. We will pursue the anomaly and future findings will be sent to you. Regards, Agustin ---------------------------------- Forwarded ---------------------------------- From: Agustin Chamarro at JPL-MDSCC Date: 7/2/97 12:34PM To: Salvatore F Abbate at JPL-B507 *cc: Jose Urech *cc: Angel Martin *cc: Ramon Robles at MADPO *cc: Jose L Alonso at MADPO *cc: Jesus Gimeno at MADPO Subject: DSS65 MGS Gravity wave experiment ------------------------------------------------------------------------ From rsimpson Wed Jul 9 17:05:56 1997 Received: (from rsimpson@localhost) by magellan.Stanford.EDU (8.8.5/8.8.3) id RAA06992; Wed, 9 Jul 1997 17:05:35 -0700 (PDT) Date: Wed, 9 Jul 1997 17:05:35 -0700 (PDT) From: Dick Simpson 723-3525 Message-Id: <199707100005.RAA06992@magellan.Stanford.EDU> To: john@oberon.jpl.nasa.gov, len@nova.Stanford.EDU, rsimpson@magellan.stanford.edu, trish@rodan.jpl.nasa.gov Subject: Re: FWD: DSS65 MGS Gravity wave experiment Content-Length: 454 Status: R During our single run yesterday there were amplitude fluctations at two scales. At time scales of minutes there was a 0.1 dB peak-to-peak variation. At time scales of seconds, there were fluctuations of a few hundredths of a dB. In both cases, what I see looks random -- there nothing as dramtic as what John found on 97/120. I've not looked at amplitude variations on time scales of less than 1 second, nor have we looked at frequency residuals yet.