PDS_VERSION_ID        = PDS3
RECORD_TYPE           = STREAM
OBJECT                = TEXT
 PUBLICATION_DATE     = 2007-07-27
 NOTE                 = " E-mail and other messages
                          concerning MGS Radio Science on
                          or about 1998/059."
END_OBJECT            = TEXT
END


From trish@rodan.jpl.nasa.gov Sat Feb 28 03:33:47 1998
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Date: 28 Feb 98 03:35:25 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Occultation #48
To: David Hinson <hinson@nimbus.Stanford.EDU>,
        Richard Simpson <rsimpson@magellan.stanford.edu>,
        Joe Twicken <joe@neptune.Stanford.EDU>,
        Len Tyler <len@nova.Stanford.EDU>
CC: Salvadore Abbate <Salvatore.F.Abbate@jpl.nasa.gov>,
        Sami Asmar <Sami.W.Asmar@jpl.nasa.gov>,
        Jennifer Caetta <caetta@biollante.jpl.nasa.gov>,
        Paula Eshe <Paula.M.Eshe@jpl.nasa.gov>
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Hello,

Occultation #48 went well, although it was slightly unusual.  Since this
was the "second prime" orbit in the sequence, the signal disappeared 1
minute 10 seconds after it was expected to disappear according to the
SOE.  The updated OPTG file was correct.  Since the timing error was
less than 225 seconds, a new sequence was not generated.

When the signal appeared, it was not centered.  A frequency offset of 100
Hz was entered at 10:22:09.  This was unexpected.  New OPTG file and SPK
files are produced even if the sequence is not updated.  The latest SPK
file was used to create the predicts; however, a 1 minute 10 second
offset in the predicts is approximately 100 Hz.

Record Times: 059-10:19:00 to 059-10:38:00
One-way Times:  059-10:19:42 to 059-10:37:31
Expected Surface Begin:  059-10:32:31 (soe)  10:33:41 (optg)
Expected Eclipse:  059-10:30:37 (soe)  10:32:35 (optg)
SNT:  31.00

SPK:  spk_i_980226_OD151_161_V1
SOE:  p151a.01.soe  (same as last occultation)
Script:  98059.65.a151.scr

There was one attenutation change at 10:21:05.

The next occultation occurs at 5:18 PM PST Saturday.

-Trish

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From rsimpson Sat Feb 28 19:55:19 1998
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From: Dick Simpson 723-3525 <rsimpson>
Message-Id: <199803010355.TAA02463@magellan.Stanford.EDU>
To: Jennifer.L.Caetta@jpl.nasa.gov, Patricia.Priest@jpl.nasa.gov,
        Paula.M.Eshe@jpl.nasa.gov, Salvatore.F.Abbate@jpl.nasa.gov,
        Sami.W.Asmar@jpl.nasa.gov, hinson@nimbus.Stanford.EDU,
        joe@neptune.Stanford.EDU, len@nova.Stanford.EDU,
        rsimpson@magellan.stanford.edu
Subject: Re: Occultation #49
Content-Length: 685
Status: R

Weekend crew doing a good job.

Re ephemeris error on Occn #48:  Since we're recording with 2500 Hz
bandwidth, I wouldn't worry if the signal is off by a couple hundred
Hz.  In this case, it was off by 100 Hz, then drifted another 150 Hz
before the occultation; but all was well within the passband, and we
can take out the errors in software here.  There's a certain amount
of judgment here (and hindsight is often useful when regrouping from
bad decisions).  But I wouldn't bother with frequency offsets if it
looks as though the signal will stay within the central 50% of the
passband during the recording interval.  Others may choose to voice
contrary opinions ...

Thanks again.

-------------------------------------------------------------------
From hinson@nimbus.Stanford.EDU Sun Mar  1 11:11:21 1998
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Subject: Re: Occultation #49
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I fully agree with your statements about the 100 Hz offset.

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From trish@rodan.jpl.nasa.gov Sun Mar  1 19:27:49 1998
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Date: 01 Mar 98 19:29:30 -0800
From: Trish Priest <trish@rodan.jpl.nasa.gov>
Subject: Offset in #48
To: Sami Asmar <Sami.W.Asmar@jpl.nasa.gov>,
        Jennifer Caetta <caetta@biollante.jpl.nasa.gov>,
        Paula Eshe <Paula.M.Eshe@jpl.nasa.gov>,
        David Hinson <hinson@nimbus.Stanford.EDU>,
        Richard Simpson <rsimpson@magellan.stanford.edu>,
        Joe Twicken <joe@neptune.Stanford.EDU>,
        Len Tyler <len@nova.Stanford.EDU>
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Hello,

The morning after Occultation #48, a second version of the SPK file was
released.  Apparently there was an error in the reconstructed periapsis
data -- which is why the signal was not centered.

I believe this means that unless there is a problem with the SPK file
again, we shouldn't have to enter frequency offsets.

-Trish

-----------------------------------------------------------------------
From joe@nova.Stanford.EDU Mon Mar  2 10:26:32 1998
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From: Joe Twicken <joe@nova.Stanford.EDU>
To: hinson@nova.Stanford.EDU, rsimpson@nova.Stanford.EDU,
        joe@nova.Stanford.EDU, stoumpis@leland.stanford.edu
Subject: RE: ODR Notice: /users/z11/procODR/80611818
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Note that this ODR suffers from the infamous sawtooth problem.

On 02-Mar-98 Joe Twicken 723-3597 wrote:
> 80591022.ODR p 65XRXIR1R201 65XRXIC1XX01 65XR1IF1S101 65XR1IS1T101