Session Notes for RD0604 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of rd0604 is to continue the series of Gb/s tests. This session has all stations fully scheduled. The schedule uses 80 sources as the previously scheduled sessions rd0601 through rd0603. Wettzell and Kokee will observe INT I06179 and join rd0604 at about 1950 UT. This schedule was generated using ultra-high minimum SNRs of 80 at X-band and 60 at S-band. An extra 3 seconds is added at the start of each scan for correlator synchronization. These extra seconds are not included in the calculation of the scan SNR. This session must be recorded on Mk5 disks. Multiple disk modules will be required. Stations must plan for disk changes by referring to the drudg listings that display the number of Gb recorded during the experiment. Refer to the last sections of these notes for reminders about testing and setup for the Gb/s recording mode. Testing prior to the experiment is essential for success. =========================================================== Parameter values for experiment RD0604 Experiment description: R&D-04 2006 Scheduler: dbb Correlator: HAYSTACK Nominal start: 2006-179-18:00:00 Nominal end: 2006-180-18:00:00 Current yyyyddd: 2006179 (2006.49) ( 13915 MJD, WED. 28JUN.) Greenwich sidereal time: 12:26:45.00 (18: 0: 0 UT) Sun's RA and DEC: 6h 30.0m 23d 15.5 =========================================================== First observations Observation listing from file ./rd0604.skd for experiment RD0604 Source Start DURATIONS name yyddd-hhmmss Ap Kk Ny On Wf Wz 4C39.25 06179-180000| 40 40 40 40 | 0059+581 06179-180206| 63 140 140 | 0552+398 06179-180918| 40 40 40 40 | 1739+522 06179-181218| 40 84 84 | 1053+815 06179-181610| 62 149 327 327 | 1300+580 06179-182218| 48 245 245 | ...... 2136+141 06179-194640| 51 51 | 1124-186 06179-194702| 40 40 | 1034-293 06179-194941| 40 40 | 0642+449 06179-195129| 76 87 139 139 67| OQ208 06179-195526| 48 152 368 368 161| 0235+164 06179-195950| 40 40 | 1351-018 06179-200235| 81 239 239 169| End of listing. =========================================================== Last observations Observation listing from file ./rd0604.skd for experiment RD0604 Source Start DURATIONS name yyddd-hhmmss Ap Kk Ny On Wf Wz 0749+540 06180-172558| 56 245 277 302 302| 0602+673 06180-173130| 57 279 222 279| 0804+499 06180-173648| 40 318 131 318 163 200| 0642+449 06180-174236| 75 82 131 131 60| 1044+719 06180-174553| 40 58 78 78 53| 0955+476 06180-174920| 40 64 121 121 56| 1606+106 06180-175302| 97 97 74| End of listing. =========================================================== SKED Summary from file ./rd0604.skd for experiment RD0604 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 4.7 Min = .0 Max = 68.6 (Baseline Ap-Wz on 0454-234) RMS = 6.6 Total time: 1435 minutes ( 23.9 hours). Key: Ap=ALGOPARK Kk=KOKEE Ny=NYALES20 On=ONSALA60 Wf=WESTFORD Wz=WETTZELL Ap Kk Ny On Wf Wz Avg % obs. time: 15 30 41 52 41 38 36 % cal. time: 3 2 4 4 3 3 3 % slew time: 65 6 18 21 12 10 23 % idle time: 16 61 36 23 43 48 38 total # scans: 237 164 335 310 260 296 267 # scans/hour : 9.9 6.9 14.0 13.0 10.9 12.4 11.2 Avg scan (sec): 55 156 105 144 135 110 117 Total GBytes: 1865 3686 5045 6435 5072 4668 4462 Total GB(M5): 1658 3276 4484 5720 4508 4150 3966 # of tapes : .1 .1 .1 .1 .1 .1 tape change times (hhmm): Total number of tapes: .9 Total GBytes (M5) recorded: 23795.3 # OF OBSERVATIONS BY BASELINE | Ap Kk Ny On Wf Wz StnTotal -------------------------------------- Ap|237 105 202 173 193 168 841 Kk| 164 140 104 106 107 562 Ny| 335 287 227 271 1127 On| 310 209 276 1049 Wf| 260 196 931 Wz| 296 1018 Number of 2-station scans: 62 Number of 3-station scans: 70 Number of 4-station scans: 82 Number of 5-station scans: 140 Number of 6-station scans: 40 Total # of scans, observations: 394 2764 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: ALGOPARK KOKEE NYALES20 ONSALA60 WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 1012.736 Mbits 506.368 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 16.00 MHz 1 16(*2) 32 1.80 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 140.0 MHz rms spanned bw= 50.9 MHz Effective number of channels recorded per sub-pass X S Total 19.780 11.868 31.648 =========================================================== Tape types ID Station Tape length Density Passes Ap ALGOPARK Mark5A Kk KOKEE Mark5A Ny NYALES20 Mark5A On ONSALA60 Mark5A Wf WESTFORD Mark5A Wz WETTZELL Mark5A =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Ap Kk Ny On Wf Ap Kk Ny On Wf Kk 80 Kk 60 Ny 80 80 Ny 60 60 On 80 80 80 On 60 60 60 Wf 80 80 80 80 Wf 60 60 60 60 Wz 80 80 80 80 80 Wz 60 60 60 60 60 ====================================================================== TESTING AND SETUP ====================================================================== This session requires 4 ribbon cables between the Formatter and the Mark 5 Recorder. If one of these cables is missing, the correlator will not be able to read any of the data. Mark 4 stations should run ftp://web.haystack.edu/pub/mark5/SNAP/chk1024.snp with ftp://web.haystack.edu/pub/mark5/SNAP/chk1024.prc VLBA4 stations such as Kokee Park, should run ftp://web.haystack.edu/pub/mark5/SNAP/vchk1024.snp and ftp://web.haystack.edu/pub/mark5/SNAP/vchk1024.prc Send a copy of the log to dsmythe@haystack.mit.edu, or put a copy in the misc directory on cddisa, with a follow-up e-mail to dsmythe. Do not touch any of the cables between the Formatter and the Mark 5 Recorder after this test has been run without any errors. ====================================================================== DISK MODULE CHANGES ====================================================================== This session will require 2, 3 or 4 disk modules, depending on the sizes that you have available at your station. DRUDG does not know the sizes, so it shows an ever-increasing GByte count. Please be aware that you will have to change modules several times during this session, and plan accordingly. There are several things to consider: 1) Mark module change times. Select the modules you will use for this session, note their sizes, and then mark by hand the places in the schedule where a module change will be necessary, and which bank will need to be changed. You can use the drudg Option 5 listing for this purpose. 2) Change modules promptly. When a module is full, the FS will automatically switch to the next one and put up a notice that you should change the old one. It is good practice to change the module as soon as it's called for, because then you are ready to record on the new one. 3) Create prompt window. The notice to change the disk module will scroll off the screen pretty quickly and you might miss it. It is possible, using the fs.prompt program, to create a prompt window on the screen with a message that you should replace the module. The window will stay there until you dismiss it by clicking on "continue". It is possible to do this so that the schedule will not be blocked while the window is displayed. To do this, edit your "change_pack" procedure and insert the following line as the first line: sy=fs.prompt "change disk module that is not selected" & The use of the "&" at the end is of the line is crucial to making sure that the schedule is not blocked. Please make sure you enter the line exactly as shown (you can adjust the message inside the quotes). One thing to be aware of is that the prompt will not tell you which module to change, so you must be careful to select the right one, i.e., the one that is not currently selected. If you have any questions, please contact Ed Himwich (weh@ivscc.gsfc.nasa.gov).