PDS_VERSION = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 1997-02-21 NOTE = "MGS RST Instrument Health Report HEA7052A.TXT" END_OBJECT = TEXT END Summary ======= USO readings nominal, except USO temp being affected by MOC heater GWE rehearsal data obtained, but quick-look software failed USO Test #7 data processed; only the usual problems Engineering Data ================ Engineering Data Statistical Summary from CSV2STAT: First SCET: 1997-02-20T01:25:04.722 Last SCET: 1997-02-20T23:54:52.718 CHANNL CHANNEL TITLE DN-LO DN-HI EU-LO EU-HI EU-AVG/STDEV RECDS ------ ------------- ----- ----- --------- --------- ---------/-------- ----- L-0037 MOT1_USO_ENA 0 0 4134 L-0047 MOT2_USO_ENA 1 1 4134 L-0060 TWTA1_FILMNT 0 0 4134 L-0061 TWTA1_HV 0 0 4128 L-0070 TWTA2_FILMNT 1 1 4128 L-0071 TWTA2_HV 0 0 4134 L-0080 USO_PWR 0 0 4134 L-0111 MOT1_RCV_AGC 245 255 -1.52E+02 -1.47E+02 -1.52E+02/1.08E-03 4134 L-0121 MOT2_RCV_AGC 113 255 -1.53E+02 -1.05E+02 -1.11E+02/1.31E-01 4134 L-0131 TWTA1_HLX_I 0 1 -3.84E-02 -1.85E-02 -3.83E-02/2.25E-05 4134 L-0132 TWTA1_ANOD_V 0 1 -1.00E+03 -1.00E+03 -1.00E+03/6.68E-03 517 L-0141 TWTA2_HLX_I 38 43 7.05E-01 8.05E-01 7.53E-01/2.42E-04 4134 L-0142 TWTA2_ANOD_V 59 63 -8.70E+02 -8.62E+02 -8.66E+02/6.70E-02 517 L-0200 USO_REG_V 203 205 4.06E+00 4.10E+00 4.08E+00/3.48E-04 517 L-0201 USO_OVEN_V 123 126 2.46E+00 2.52E+00 2.50E+00/3.64E-04 517 T-0302 EPC1_T 110 129 2.37E+01 3.20E+01 2.61E+01/8.24E-02 518 T-0303 EPC2_T 103 134 2.15E+01 3.50E+01 2.45E+01/1.40E-01 518 T-0310 RF_ISOLTR1_T 173 203 1.88E+01 3.07E+01 2.15E+01/4.24E-02 4130 T-0311 RF_ISOLTR2_T 161 183 2.72E+01 3.49E+01 2.89E+01/2.71E-02 4130 T-0312 TWT1_T 172 205 1.78E+01 3.10E+01 2.12E+01/1.41E-01 517 T-0313 TWT2_T 155 181 2.79E+01 3.71E+01 3.01E+01/9.33E-02 517 T-0315 USO_T 173 175 1.15E+01 1.21E+01 1.17E+01/6.76E-03 518 L-0200 remains constant at 4.08 volts. L-0201 is up 0.03 to 2.52 volts, one of the highest readings in recent weeks. T-0315 is up 1C for the second day in a row to 12.1C. The plot shows only a gradual rise during the 24 hr period, compared with the sudden rise the previous day. Carl Kloss advises that the MOC heater is on and probably that is causing the elevation seen in T-0315. Open Loop Data ============== Data Collection --------------- A rehearsal was conducted for the Gravitational Wave Experiment. We have queried for the approximately 6.5 hrs of open-loop data; the spacecraft was in two-way mode, so we do not plan extensive analysis. YYYY/DDD DSS DSP SAMP BW DSP BIT TRK REC RECS RECS FIRST START STOP RATE MODE RESN MODE LEN MSSG SNR -------- --- -------- -------- ---- ---- ---- ---- ---- ---- ----- ---- ----- 1997/051 65 20:33:00 03:00:00 200 100 1 8 2-W 566 46440 0 UNK Data Anomalies -------------- Our parsing program (the first step in our quick-look processing) fails after processing the first 4330 records from the GWE rehearsal. We are investigating. Frequency Analyses ------------------ Joe Twicken has completed analysis of the open-loop data from USO Test #7 (97/049); his report: I have processed the ODS data from 97/049. This ODS was recorded at DSS 65. The data were acquired as part of USO Test #7. The SNR was approximately 56 dB/Hz during the Test. This was the fourth USO test since the MGS HGA was deployed. The quality of the data obtained in this test was the best to date. The ODS was acquired at DSS 65 from 19:01:27 to 21:01:26 at 5000 samples per second in mode 2 (1250 12-bit samples/second for each of 4 A/D's). I believe that the ODS was retransmitted multiple times on the day of the test because there were a number of null SFDU's (SFDU headers with no ODS record attached) in the data stream. There were no missing records when the ODS was retrieved at Stanford. There were no attenuation changes or other problems with operations during the Test, either. I used the spk_c_961111-970328 SP-kernel file to steer the data. This file was created on 97/029. The POCA file was fixed with our "salvagePoca" program. Once again, no hand modification of the POCA file was required. A very brief analysis of the original POCA file indicated that there were over 150 POCA records in error. All the errors seemed to be confined to five error bursts. During the 2 hour recording there were a total of 7200 POCA records. An amplitude modulation with a period of about 8-10 minutes is evident in all the carrier amplitude estimates. Amplitude modulations have been seen in all USO Tests since the deployment of the HGA. The peak-to-peak variation during this test was on the order of 0.2 to 0.3 dB. The source of this modulation remains unknown. As in many previous tests, there were also a pair of frequency spurs at approximately 650 Hz on either side of the carrier. In this test, the level of these spurs was about 33 dB below that of the carrier. The spurs appear to drift through the spectrum along with the carrier. I estimated the USO frequency to be 8423152925.03 Hz. The best linear fit to the USO frequency since 96/323 has a slope of 0.252 Hz/day. This fit is actually quite good. The 1-sigma error between our USO frequency estimates since 96/323 and the best linear fit to them is 0.33 Hz. The Allan deviation for this recording is shown below. The SNR during the acquisition of data was approximately 56 dB/Hz. I did not compensate for the spacecraft spin cycle. Overall, this was the best Allan deviation performance of all the USO Tests. t (sec) AD ------ ---------- 0.4096 3.7005e-13 1.6384 2.2193e-13 3.2768 1.6435e-13 6.5536 1.3345e-13 26.2144 1.2377e-13 Closed Loop Data ================ We have obtained the following files: ODF: 97050C051.DAT;2