PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = "MEX-M-MRS-1/2/3-EXT2-2515-V1.0" STANDARD_DATA_PRODUCT_ID = ENB PRODUCER_ID = "SUE" PRODUCT_ID = "M00SUE0L1A_ENB_102241358_00.TXT" PRODUCT_CREATION_TIME = 2012-10-11T09:44:24.000 INSTRUMENT_HOST_ID = "MEX" OBJECT = TEXT PUBLICATION_DATE = 2011-03-10 NOTE = "MEX SUE Experimenter Notes" END_OBJECT = TEXT END From gene.goltz@jpl.nasa.gov Thu Aug 12 13:20:37 2010 Return-Path: Received: from mail.jpl.nasa.gov (smtp.jpl.nasa.gov [128.149.139.109]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7CKKbT07185 for ; Thu, 12 Aug 2010 13:20:37 -0700 (PDT) Received: from ggoltz-xp.jpl.nasa.gov (ggoltz-2k.jpl.nasa.gov [137.78.78.47]) by smtp.jpl.nasa.gov (Switch-3.4.3/Switch-3.4.3) with ESMTP id o7CKKZ9Z007013 (using TLSv1/SSLv3 with cipher DHE-RSA-AES256-SHA (256 bits) verified NO); Thu, 12 Aug 2010 13:20:36 -0700 Message-Id: <6.2.5.6.2.20100812125519.02091428@jpl.nasa.gov> X-Mailer: QUALCOMM Windows Eudora Version 6.2.5.6 Date: Thu, 12 Aug 2010 13:20:33 -0700 To: Dick Simpson 650-723-3525 From: Gene Goltz Subject: MEX 2010-224 Bistatic Radar, 25 kHz Data Cc: Sami Asmar , Daniel.S.Kahan@jpl.nasa.gov Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1271217797==.ALT" X-Source-IP: ggoltz-2k.jpl.nasa.gov [137.78.78.47] X-Source-Sender: gene.goltz@jpl.nasa.gov X-AUTH: Authorized Content-Length: 3137 Status: RO --=====================_1271217797==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Dick, A MEX Bistatic Radar Experiment on DOY 2010-224 was conducted at DSS-63. RSR open-loop data were recorded and played back as follows: - X-band RCP, 1-way - RSR2B3 - 25 kHz, 16 bits - 13:58:00 - 15:20:00 - 16:03:00 - 16:43:00 - 16:43:00 - 17:20:00 - 17:20:00 - 18:25:00 and: - S-band RCP, 1-way - RSR2A3 - 25 kHz, 16 bits - 13:58:00 - 15:20:00 - 16:03:00 - 16:43:00 - 16:43:00 - 17:20:00 - 17:20:00 - 18:25:00 plus: - X-band LCP, 1-way - RSR1B3 - 25 kHz, 16 bits - 13:58:00 - 15:20:00 - 16:03:00 - 16:43:00 - 16:43:00 - 17:20:00 - 17:20:00 - 18:25:00 and: - S-band LCP, 1-way - RSR1A3 - 25 kHz, 16 bits - 13:58:00 - 15:20:00 - 16:03:00 - 16:43:00 - 16:43:00 - 17:20:00 - 17:20:00 - 18:25:00 These data should now be available in your MEX directory on rsops2. The 100 kHz data will be played back later today. - Regards, Gene & Danny From gene.goltz@jpl.nasa.gov Thu Aug 12 14:20:53 2010 Return-Path: Received: from mail.jpl.nasa.gov (mailhost.jpl.nasa.gov [128.149.139.106]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7CLKrT07644 for ; Thu, 12 Aug 2010 14:20:53 -0700 (PDT) Received: from ggoltz-xp.jpl.nasa.gov (ggoltz-2k.jpl.nasa.gov [137.78.78.47]) by smtp.jpl.nasa.gov (Switch-3.4.3/Switch-3.4.3) with ESMTP id o7CLKpAn022555 (using TLSv1/SSLv3 with cipher DHE-RSA-AES256-SHA (256 bits) verified NO); Thu, 12 Aug 2010 14:20:52 -0700 Message-Id: <6.2.5.6.2.20100812132038.020a8050@jpl.nasa.gov> X-Mailer: QUALCOMM Windows Eudora Version 6.2.5.6 Date: Thu, 12 Aug 2010 14:20:49 -0700 To: Dick Simpson 650-723-3525 From: Gene Goltz Subject: MEX 2010-224 Bistatic Radar, 100 kHz Data Cc: Sami Asmar , Daniel.S.Kahan@jpl.nasa.gov Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1274834032==.ALT" X-Source-IP: ggoltz-2k.jpl.nasa.gov [137.78.78.47] X-Source-Sender: gene.goltz@jpl.nasa.gov X-AUTH: Authorized Content-Length: 2402 Status: RO --=====================_1274834032==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Dick, A MEX Bistatic Radar Experiment on DOY 2010-224 was conducted at DSS-63. RSR open-loop data were recorded and played back as follows: - X-band RCP, 1-way - RSR2B4 - 100 kHz, 16 bits - 16:43:00 - 17:00:00 - 17:00:00 - 17:20:00 and: - S-band RCP, 1-way - RSR2A4 - 100 kHz, 16 bits - 16:43:00 - 17:00:00 - 17:00:00 - 17:20:00 plus: - X-band LCP, 1-way - RSR1B4 - 100 kHz, 16 bits - 16:43:00 - 17:00:00 - 17:00:00 - 17:20:00 and: - S-band LCP, 1-way - RSR1A4 - 100 kHz, 16 bits - 16:43:00 - 17:00:00 - 17:00:00 - 17:20:00 These data should now be available in your MEX directory on rsops2. - Regards, Gene & Danny From gene.goltz@jpl.nasa.gov Thu Aug 12 11:49:28 2010 Return-Path: Received: from mail.jpl.nasa.gov (smtp.jpl.nasa.gov [128.149.139.106]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7CInST05139 for ; Thu, 12 Aug 2010 11:49:28 -0700 (PDT) Received: from ggoltz-xp.jpl.nasa.gov (ggoltz-2k.jpl.nasa.gov [137.78.78.47]) by smtp.jpl.nasa.gov (Switch-3.4.3/Switch-3.4.3) with ESMTP id o7CInQlm022925 (using TLSv1/SSLv3 with cipher DHE-RSA-AES256-SHA (256 bits) verified NO); Thu, 12 Aug 2010 11:49:26 -0700 Message-Id: <6.2.5.6.2.20100812060025.02091440@jpl.nasa.gov> X-Mailer: QUALCOMM Windows Eudora Version 6.2.5.6 Date: Thu, 12 Aug 2010 11:49:26 -0700 To: Dick Simpson 650-723-3525 From: Gene Goltz Subject: MEX 2010-224 BSR Ops Log Cc: Sami Asmar , Daniel.S.Kahan@jpl.nasa.gov, Jesse.Velasco@jpl.nasa.gov Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=====================_1265748063==_" X-Source-IP: ggoltz-2k.jpl.nasa.gov [137.78.78.47] X-Source-Sender: gene.goltz@jpl.nasa.gov X-AUTH: Authorized Content-Length: 123646 Status: R --=====================_1265748063==_ Content-Type: text/plain; charset="us-ascii"; format=flowed Dick, Attached please find the operations log for the MEX Bistatic Radar (BSR) experiment that was conducted on 12 August (DOY 224) at DSS- 63. This experiment went well, with strong X-band echoes returned (and weaker S-band); LCP signals stronger than RCP for both bands, slowly transitioning to RCP & LCP about equal around 17:18. There was one problem encountered during this activity: when the S-band signal was aquired, it was determined that the maser was not tuned properly. At approximately 15:15 (between the pre-cal and the 1st mini-cal) the station performed a retune. This resulted in a much stonger S-RCP signal. We then increased the ATT setting from 15.0 to 31.5 on the RSR, to bring ADC Amplitutde closer to the expected value (-20.3). This problem is documented in DR# M105891. - Gene & Danny --=====================_1265748063==_ Content-Type: application/octet-stream; name="MEX_BSR_20100812_D63.xls"; x-mac-type="584C5334"; x-mac-creator="5843454C" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="MEX_BSR_20100812_D63.xls" 0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAACAAAAAQAAAAAAAAAA EAAAMgAAAAEAAAD+////AAAAAAAAAAA0AAAA//////////////////////////////////////// ... From rsimpson Thu Aug 12 12:36:37 2010 Return-Path: Received: (from rsimpson@localhost) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) id o7CJaa905568; Thu, 12 Aug 2010 12:36:36 -0700 (PDT) Date: Thu, 12 Aug 2010 12:36:36 -0700 (PDT) From: Dick Simpson 650-723-3525 Message-Id: <201008121936.o7CJaa905568@magellan.stanford.edu> To: gene.goltz@jpl.nasa.gov Subject: Re: MEX 2010-224 BSR Ops Log Cc: Daniel.S.Kahan@jpl.nasa.gov, Jesse.Velasco@jpl.nasa.gov, rsimpson, sami.asmar@jpl.nasa.gov Content-Length: 487 Status: RO >This experiment went well ... Thanks, Gene, Danny, and Jesse. This will be the last BSR for a while. Your conscientious attention to the work has made this a very satisfying experience. > ... it was determined that the maser was not tuned properly ... IT will be interesting to see whether this change results in more 'normal' appearances for Mars. I'm not sure we have enough puzzle pieces to draw conclusions, but it's worth trying. Many thanks again. Dick From wilson.chen@dsn.nasa.gov Mon Aug 16 09:52:55 2010 Return-Path: Received: from DSNOAM-MM.jpl.nasa.gov (dsnoam-mm.jpl.nasa.gov [128.149.207.83]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7GGqsT08846 for ; Mon, 16 Aug 2010 09:52:54 -0700 (PDT) Received: from dsnoamex1.jpl.nasa.gov (Not Verified[128.149.207.88]) by DSNOAM-MM.jpl.nasa.gov with MailMarshal (v6,7,2,8378) id ; Mon, 16 Aug 2010 09:54:50 -0700 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CB3D63.BE07DED8" Subject: 41 RMDC Radio Science Delivery X-MimeOLE: Produced By Microsoft Exchange V6.5 Date: Mon, 16 Aug 2010 09:54:50 -0700 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: 41 RMDC Radio Science Delivery Thread-Index: AcoMpLwnrYVmBHKJRlGFcNvJk8Md9ACM2+0gAMn6QCABPE/UIADtPmwgAY88RiAAPLpgIADCFpkgAgKgSyABUk9qIADKO0YgAJV+dCAAyZUkIACXzZAgAMjmliAAlnc8IAEpvWMgAZUNMSAA/FRsgANZkSbwFZk3A8AAPvo8EAElYx/gAA1xqkACS28twABsUvDgASLqWcADW5/H4AD4mFDAAPzSn2AAZoCu0AEqgyiQASu42i References: To: Cc: "!DL-DSN-RMDC" Content-Length: 10603 Status: RO This is a multi-part message in MIME format. ------_=_NextPart_001_01CB3D63.BE07DED8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable The following files have been processed and delivered to: OSCARX://ftp/ras/sc41/odfs/10224O224_63X_1s.SC041 OSCARX://ftp/ras/sc41/odfs/10224O224_63S_1s.SC041 OSCARX://ftp/ras/sc41/odfs/10227O227_15X_1s.SC041 OSCARX://ftp/ras/sc41/odfs/10227O227_15S_1s.SC041 Regards, Wilson Chen RMDC Analyst E-mail - wilson.chen@dsn.nasa.gov Office - 626-305-6269 Cell - 626-552-8281 This document has been reveiwed for export control and, does NOT contain controlled technical data. From jesse.velasco@dsn.nasa.gov Tue Aug 24 10:33:03 2010 Return-Path: Received: from DSNOAM-MM.jpl.nasa.gov (dsnoam-mm.jpl.nasa.gov [128.149.207.83]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7OHX3T10089 for ; Tue, 24 Aug 2010 10:33:03 -0700 (PDT) Received: from dsnoamex1.jpl.nasa.gov (Not Verified[128.149.207.88]) by DSNOAM-MM.jpl.nasa.gov with MailMarshal (v6,7,2,8378) id ; Tue, 24 Aug 2010 10:35:04 -0700 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CB43B2.AF629C0C" Subject: MEX BSR DR DOY 224 OVER DSS-63 Date: Tue, 24 Aug 2010 10:34:57 -0700 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: MEX BSR DR DOY 224 OVER DSS-63 Thread-Index: ActDsqt7WXDwnngzTCmmTYprGriM1A== From: "Velasco, Jesse" To: Cc: "!DL-DSN-MPSETD" Content-Length: 7511 Status: RO This is a multi-part message in MIME format. ------_=_NextPart_001_01CB43B2.AF629C0C Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dick, I'm going to open a DR to document the high SNT on the SRCP and want to provide our OEs (operational Engineers) with all the necessary information. I have the following questions: 1. Was the SRCP 30K jump experienced throughout the BSR activity? 2. What was the elevation during the SRCP SNT jump? 3. Was the SLCP SNT stable? 4. Can you provide us with the Y-factors? 5. What was the weather conditions during this BSR. Thanks Jesse From rsimpson Tue Aug 24 15:33:29 2010 Return-Path: Received: (from rsimpson@localhost) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) id o7OMXSe11951; Tue, 24 Aug 2010 15:33:28 -0700 (PDT) Date: Tue, 24 Aug 2010 15:33:28 -0700 (PDT) From: Dick Simpson 650-723-3525 Message-Id: <201008242233.o7OMXSe11951@magellan.stanford.edu> To: jesse.velasco@dsn.nasa.gov, rsimpson Subject: Re: MEX BSR DR DOY 224 OVER DSS-63 Content-Length: 1832 Status: R >I'm going to open a DR to document the high SNT on the SRCP and want to >provide our OEs (operational Engineers) with all the necessary >information. I have the following questions: >1. Was the SRCP 30K jump experienced throughout the BSR activity? The entire pre-cal was useless because the maser was not tuned. S-RCP Tsys = 28.05K during the post-cal. During the track, Tsys increased from 29.93K to 30.01K (before and after the surface observations). There was no 'jump'; S-RCP Tsys was high from beginning to end. >2. What was the elevation during the SRCP SNT jump? Elevation angles ranged from about 46.6 deg at BOT (15:25) to 35.8 deg at EOT (17:47). >3. Was the SLCP SNT stable? S-LCP seemed very stable. >4. Can you provide us with the Y-factors? DOY 224: Post-cal Y-factor for S-RCP was 10.3 dB with S1=21.44C DOY 184: Pre-cal Y-factor for S-RCP was 10.3 dB with S1=20.88C Post-cal Y-factor for S-RCP was 10.3 dB with S1=19.44C Last normal S-RCP Y-Factor at DSS 63 DOY 170: Post-cal Y-factor for S-RCP was 11.4 dB with S1=18.3C Last S-RCP Y-factor at another complex (DSS 43) DOY 218: Pre-cal Y-factor for S-RCP was 11.8 dB with S1=21.12C Post-cal Y-factor for S-RCP was 11.7 dB with S1=19.2C As you can see, the S-RCP Y-factor degraded by 1.1 dB between day 170 and day 184. On day 224, it was the same as on 184. Compared with DSS 43, even the nominal DSS 63 Y-factor is a little worse. >5. What was the weather conditions during this BSR. DOY 224: T=30C, H=30%, sky=clear DOY 184: clear to partly cloudy DOY 170: clear to partly cloudy DOY 218 at DSS 43: clear to scattered clouds I don't think weather (or elevation angle) is contributing to the S-RCP degradation. Let me know if you need more. Thanks, Dick From gene.goltz@jpl.nasa.gov Wed Aug 25 06:46:59 2010 Return-Path: Received: from mail.jpl.nasa.gov (smtp.jpl.nasa.gov [128.149.139.105]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7PDkwT22142 for ; Wed, 25 Aug 2010 06:46:59 -0700 (PDT) Received: from ggoltz-xp.jpl.nasa.gov (ggoltz-2k.jpl.nasa.gov [137.78.78.47]) by smtp.jpl.nasa.gov (Switch-3.4.3/Switch-3.4.3) with ESMTP id o7PDkvux024728 (using TLSv1/SSLv3 with cipher DHE-RSA-AES256-SHA (256 bits) verified NO); Wed, 25 Aug 2010 06:46:57 -0700 Message-Id: <6.2.5.6.2.20100825062453.0200baa8@jpl.nasa.gov> X-Mailer: QUALCOMM Windows Eudora Version 6.2.5.6 Date: Wed, 25 Aug 2010 06:46:57 -0700 To: Dick Simpson 650-723-3525 From: Gene Goltz Subject: DSS-63 S-band RCP Tsys Issue Cc: Padma.Varanasi@jpl.nasa.gov, Scott.L.Riley@jpl.nasa.gov, Jesse.Velasco@jpl.nasa.gov, Daniel.S.Kahan@jpl.nasa.gov Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Source-IP: ggoltz-2k.jpl.nasa.gov [137.78.78.47] X-Source-Sender: gene.goltz@jpl.nasa.gov X-AUTH: Authorized Content-Length: 531 Status: O Dick, The Cassini Radio Science experiment schedule shows an occultation support on DOY 245 (Thursday, 02 September) that has DSS-63 S-band RCP and LCP (1-way) from 11:30 to 16:30 UTC. This might be an op- portunity to check the S-RCP Tsys issue we observed during the MEX BSR on DOY 232. But, since it's a rings occultation, it is likely that the S-LCP 2.5 dB "dropout" issue/fix cannot be checked. What can we do on our side to assist the DSN with the investigation and resolution of this Tsys problem? - Regards, Gene From rsimpson Wed Aug 25 12:33:06 2010 Return-Path: Received: (from rsimpson@localhost) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) id o7PJX6Z22181; Wed, 25 Aug 2010 12:33:06 -0700 (PDT) Date: Wed, 25 Aug 2010 12:33:06 -0700 (PDT) From: Dick Simpson 650-723-3525 Message-Id: <201008251933.o7PJX6Z22181@magellan.stanford.edu> To: gene.goltz@jpl.nasa.gov Subject: Re: DSS-63 S-band RCP Tsys Issue Cc: Daniel.S.Kahan@jpl.nasa.gov, Jesse.Velasco@jpl.nasa.gov, Padma.Varanasi@jpl.nasa.gov, Scott.L.Riley@jpl.nasa.go, rsimpson Content-Length: 1892 >The Cassini Radio Science experiment schedule shows an occultation >support on DOY 245 (Thursday, 02 September) that has DSS-63 S-band >RCP and LCP (1-way) from 11:30 to 16:30 UTC. This might be an op- >portunity to check the S-RCP Tsys issue we observed during the MEX >BSR on DOY 232. But, since it's a rings occultation, it is likely >that the S-LCP 2.5 dB "dropout" issue/fix cannot be checked. What >can we do on our side to assist the DSN with the investigation and >resolution of this Tsys problem? Not sure I fully understand the DSS 63 configuration planned for DOY 245. If S-LCP will be recorded, you should look for 2.5 dB drops any time during the recording. These typically occur over 3-7 minutes, so they are easy to see. Both noise and spacecraft signals go down, then recover. Our MEX BSR experience is that these occurred most often when the elevation angle was 44-47 deg. So looking at S-LCP data collected in that elevation angle range would be the most interesting. But, as noted above, these drops are note subtle. And, they MAY occur at other elevation angles (we have a couple candidates when the 70-m was moving to or at stow). The S-RCP Tsys problem is easiest to see in Y-factors measured during pre- and post-cal. If the S-RCP Y-factor is 10.3 dB with the ambient load, then the maser performance is degraded. If the S-RCP Y-factor is more like 11.3 dB, then the maser is working the way I ewould expect. It appears the S-RCP Y-factor changed between the BSRs of 170 and 184. On both 184 and 224 it was degraded. For comparison, the Y-factor at DSS 43 on 218 was 11.7-11.8. The station probably check Y-factors during every pre- and post-cal. This is not special for radio science passes. We make our pre- and post-cal very elaborate; but a very basic pre- and post-cal should include Y-factors. From aseel.anabtawi@jpl.nasa.gov Wed Aug 25 14:03:45 2010 Return-Path: Received: from mail.jpl.nasa.gov (mailhost.jpl.nasa.gov [128.149.139.105]) by magellan.stanford.edu (8.11.7p3+Sun/8.11.7) with ESMTP id o7PL3jT22941 for ; Wed, 25 Aug 2010 14:03:45 -0700 (PDT) Received: from mail.jpl.nasa.gov (altvirehtstap01.jpl.nasa.gov [128.149.137.72]) by smtp.jpl.nasa.gov (Switch-3.4.3/Switch-3.4.3) with ESMTP id o7PL3k7f009767 (using TLSv1/SSLv3 with cipher RC4-MD5 (128 bits) verified FAIL) for ; Wed, 25 Aug 2010 14:03:46 -0700 Received: from ALTPHYEMBEVSP40.RES.AD.JPL ([128.149.137.87]) by ALTVIREHTSTAP01.RES.AD.JPL ([128.149.137.72]) with mapi; Wed, 25 Aug 2010 14:03:46 -0700 Content-Type: multipart/mixed; boundary="_000_D5C40BEFB1971440A1386910E522444009043B81ALTPHYEMBEVSP40_" From: "Anabtawi, Aseel (332K)" To: "Simpson, Richard A (6520-Affiliate)" , "Kahan, Daniel S (332K)" CC: "Goltz, Gene L (332K)" Date: Wed, 25 Aug 2010 14:03:45 -0700 Subject: RE: DSS-63 S-band RCP Tsys Issue Thread-Topic: DSS-63 S-band RCP Tsys Issue Thread-Index: ActEl3bXSu9N/hhZT3SQ8MHuPWQkaQAAVbLg Message-ID: References: <201008252052.o7PKqcA22824@magellan.stanford.edu> In-Reply-To: <201008252052.o7PKqcA22824@magellan.stanford.edu> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US MIME-Version: 1.0 X-Source-IP: altvirehtstap01.jpl.nasa.gov [128.149.137.72] X-Source-Sender: aseel.anabtawi@jpl.nasa.gov X-AUTH: Authorized Content-Length: 8619 Status: O --_000_D5C40BEFB1971440A1386910E522444009043B81ALTPHYEMBEVSP40_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks so much, Dick. I too don't think that a spacecraft signal is require= d to tune the S-Maser. I'll check with the NOPEs. I, and the Cassini RSS team, thank you :) =20 -----Original Message----- From: Dick Simpson 650-723-3525 [mailto:rsimpson@magellan.stanford.edu]=20 Sent: Wednesday, August 25, 2010 1:53 PM To: Kahan, Daniel S (332K) Cc: Anabtawi, Aseel (332K); Goltz, Gene L (332K) Subject: RE: DSS-63 S-band RCP Tsys Issue >Do you see any problem with asking the NOPEs/station about fine-tuning=20 >the Mase (this was done rather quickly during the BSR) when S-Band comes o= n, or otherwise >tinkering with S-Band during this track? We figure this shouldn't affect X= -Band =20 >or telemetry, only a slight risk to losing S-Band during MEX gravity,=20 >but also a chance to improve it. This sounds like an excellent idea. It's possible that the S-RCP maser h= as simply been out of tune since approximately DOY 180. However, retuning t= he maser at the beginning of BSR 224 only returned its performance to the 18= 4 level (Y-factor ~ 10.3 dB). So even though it may have been done quickly= , I'm guessing there's something else behind the remaining 1 dB loss in performance. I doubt that a proper tuning of the maser requires a spacecraft signal; b= ut that's something for the receiver engineers to answer. For a real-time adjustment, it's probably easier for an operator to watch the spacecraft peak. Except that it's Saturday, a day time pass might be easier to get = SPC 60 receiver engineers involved. Tuning the S-Band maser shouldn't affect X-Band or telemetry. I agree th= at there is a small risk to S-Band tracking; but the chance to improve S-RCP performance outweighs that risk in my book. And, if the retuning or othe= r tweaking can be done before tracking begins, the payoff-to-risk ratio is hgher still. --_000_D5C40BEFB1971440A1386910E522444009043B81ALTPHYEMBEVSP40_ Content-Disposition: attachment; filename="winmail.dat" Content-Transfer-Encoding: base64 Content-Type: application/ms-tnef; name="winmail.dat" eJ8+IhQKAQaQCAAEAAAAAAABAAEAAQeQBgAIAAAA5AQAAAAAAADoAAEJgAEAIQAAADczREE1QzY1 NTRDMUE1NEY4RkEwNjcwQUFGNUVFQTEyAFYHAQ2ABAACAAAAAgACAAEFgAMADgAAANoHCAAZABUA AwAtAAMASgEBIIADAA4AAADaBwgAGQAVAAMALQADAEoBAQiABwAYAAAASVBNLk1pY3Jvc29mdCBN YWlsLk5vdGUAMQgBBIABACEAAABSRTogRFNTLTYzIFMtYmFuZCBSQ1AgVHN5cyBJc3N1ZQCnCQED kAYASBEAADwAAAACAX8AAQAAAEYAAAA8RDVDNDBCRUZCMTk3MTQ0MEExMzg2OTEwRTUyMjQ0NDAw OTA0M0I4MUBBTFRQSFlFTUJFVlNQNDAuUkVTLkFELkpQTD4AAAACAQkQAQAAAC4GAAAqBgAAbgkA AExaRnWJmM2/YQAKZmJpZAQAAGNjwHBnMTI1MgD+A0PwdGV4dAH3AqQD4wIABGNoCsBzZXQwIO8H bQKDAFARTTIKgAa0AoCWfQqACMg7CWIxOQ7AvwnDFnIKMhZxAoAVYioJsHMJ8ASQYXQFsg5QA2Bz 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650-723-3525 Message-Id: <201008252136.o7PLa7L23065@magellan.stanford.edu> To: aseel.anabtawi@jpl.nasa.gov Subject: RE: DSS-63 S-band RCP Tsys Issue Cc: daniel.s.kahan@jpl.nasa.gov, gene.l.goltz@jpl.nasa.gov, rsimpson Content-Length: 326 >Thanks so much, Dick. I too don't think that a spacecraft signal is required >to tune the S-Maser. I'll check with the NOPEs. It's only a dB; but it could be something that will degrade further. To the extent that MEX can improve CASSINI's science, we are more than happy to share experiences. Best wishes, Dick