August 1993
SPECIAL NOTE
DSS61 is still red as of 8/01/93. Present predicted date of return of service
is now day 93.238.00:00 (August 26th). There will continue to be periods of
256 bps record rate during the extended gaps caused by the loss of DSS61.
Even with the use of DSS68 (Weilheim) following testing, it will still not be
possible to perform all recording between passes at the nominal 512 bps.
Scheduled periods of 256 bps record rate will be notified via this Bulletin
Board.
1st Aug Earth pointing manoeuvre.
213.00:31-00:52 21m 256 bps data lost due to spacecraft going 2-way during
SCET playback.
2nd Aug KEP IFC.
3rd Aug KEP RAM Dump.
4th Aug BAM-I Matrix 0 command.
Earth pointing manoeuvre.
5th Aug Routine operations.
6th Aug
218.23:53 - 36m playback data lost due to spacecraft going 2-way during
219:00:29 SCET data playback via DSS43.
7th Aug Earth pointing manoeuvre.
8th Aug
220.07:27-07:42 15m bad realtime data due to TPA problems at DSS42 following
SCET bitrate change.
220.10:29-19:42 9h13m playback data lost due to DNEL3 on DOY 93.221.
SCET
9th Aug KEP IFC.
Earth pointing manoeuvre.
221.00:39-01:19 40m playback data lost due to TPA problem at DSS42.
SCET
221.05:08-05:24 16m realtime data lost due to TPA problem at DSS42 following
SCET spacecraft going 2-way.
DSS68 (Weilheim) scheduled to receive data at 1024 bps.
221.07:00:24 DNEL (Disconnect Non Essential Loads) occurred on board the
SCET spacecraft. This coincided with the beginning of the planned
routine Earth pointing manoeuvre. An estimated 30% of the
planned pulses took place before onboard reconfiguration
took place and halted the manoeuvre. The last frame of
telemetry was received at 07:01:28 SCET. Telemetry was
switched on again at 221:10:22 SCET. All experiment teams
should examine their data for any unusual behaviour in the
moments leading up to the DNEL.
The Recovery from DNEL procedure has been implemented and is
proceeding well. Individual experiment teams have been
contacted to determine the desired switch on configuration.
221.07:01-10:22 3h11m realtime data lost due to DNEL. Additional loss of
SCET recorded data as DNEL occurred during playback periods.
221.15:16 - Data at 256 bps for recording, due to lack of available
222.07:37 SCET playback periods due to DSS61 loss.
221.19:53 Experiment converter switch on.
221.20:36 HED reconfiguration completed.
221.20:39 LAN reconfiguration completed.
222.04.10 HUS reconfiguration completed.
222.05:46 GLG all heaters on.
222.08:13 STO reconfiguration completed.
10th Aug Continue DNEL recovery.
DSS68 (Weilheim) scheduled to receive data at 1024 bps.
222.15:22 - Data at 256 bps for recording, due to lack of available
223.04:19 SCET playback periods due to DSS61 loss.
223.05:59 GLG HV on.
223.05:59 SIM reconfiguration completed.
223.06:30 Earth pointing manoeuvre.
11th Aug Continue DNEL recovery.
223.22:09 Return to AOCS1.
223.22:36 GRU Switch on.
223.22:59 Return to TX2.
Earth pointing manoeuvre.
HED calibration.
12th Aug DSS68 (Weilheim) scheduled to receive data at 1024 bps.
224.01:44 BAM-I reconfiguration completed.
224.02:00 BAM-E reconfiguration completed.
224.06:11 KEP reconfiguration completed.
224.07:43 GRU reconfiguration completed.
224.06:27-06:48 20m realtime data lost due to TPA failure following bitrate
SCET change at DSS42.
13th Aug DSS68 (Weilheim) scheduled to receive data at 1024 bps.
Earth pointing manoeuvre.
225.10:29 GAS Health check.
225.05:53 BAM-E Recovery from Sleep Mode.
225.07:43 GLG reconfiguration completed.
225.15:12 - Data at 256 bps for recording, due to lack of available
226.04:47 SCET playback periods due to DSS61 loss.
225.22:55-23:15 20m 256 bps recorded data lost due to spaceraft going 2-way
SCET during playback.
14th Aug DSS68 (Weilheim) scheduled to receive data at 1024 bps.
15th Aug DSS68 (Weilheim) scheduled to receive data at 1024 bps.
Earth pointing manoeuvre.
16th Aug KEP IFC.
17th Aug HET calibration.
229.19:03-19:19 16m recorded data lost due to spaceraft going 2-way
SCET during playback.
18th Aug Earth pointing manoeuvre.
19th Aug GRU routine noise test.
20th Aug HUS Datation Test via DSS42.
21st Aug Earth pointing manoeuvre.
22nd Aug Routine operations.
234.23:19 - Period of intermittent bad data due to receiver glitches
234.23:28 SCET at DSS 42.
23rd Aug KEP IFC.
Earth pointing manoeuvre.
24th Aug Routine operations.
25th Aug HED calibration.
26th Aug Earth pointing manoeuvre.
DSS61 returns to service after bearing replacement.
27th Aug Routine operations.
28th Aug Routine operations.
29th Aug Earth pointing manoeuvre.
30th Aug KEP IFC.
First Ulysses tracking pass using DSS61 following bearing
replacement.
242.08:53-09:11 18m bad/missing realtime data due to TGC interface problems
SCET at DSS61.
31st Aug KEP RAM Dump.
Earth pointing manoeuvre.
243.06:02-06:29 27m playback data lost due to s/c going 2-way during 4K3
SCET interleaved playback.