Session Notes for RD0709 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of rd0709 is to test 512 Mbps recording mode for possible usage in CONT08. The frequency setting is basically the R1 mode (256 Mbps) but using 2-bit sampling instead of 1-bit. The schedule was generated using SNRs of 40 at X-band and 30 at S-band for all stations but TIGO. TIGO has SNRs of 25 at X and 20 at S in order to increase the number of observations. TIGO was not given a higher weight in order to keep the number of single baselines with TIGO at a smaller level (TIGO may drop out of rd0709 if a needed spare part does not arrive on time). For the first 1h50m the minimum elapsed time requirement for re-using a source was removed in order to allow for scans on the three station subnet Ny-Tc-Wf while Kk and Wz observe i07332. The schedule uses the 80 best geodetic sources. All stations are fully scheduled. Kokee and Wettzell will observe INT I07332 and join rd0709 at about 1950 UT. 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 may be required. Stations must plan for disk changes by referring to the drudg listings that display the number of Gb recorded during the experiment. =========================================================== Parameter values for experiment RD0709 Experiment description: R&D-09 2007 Scheduler: dbb Correlator: HAYSTACK Nominal start: 2007-332-18:00:00 Nominal end: 2007-333-18:00:00 Current yyyyddd: 2007332 (2007.91) ( 14433 MJD, WED. 28NOV.) Greenwich sidereal time: 22:29: 0.00 (18: 0: 0 UT) Sun's RA and DEC: 16h 17.0m -21d 19.6 =========================================================== First observations Observation listing from file ./rd0709.skd for experiment RD0709 Source Start DURATIONS name yyddd-hhmmss Kk Ny Tc Wf Wz 2145+067 07332-180000| 40 43 43 | 1606+106 07332-180147| 480 480 244 | ...... 0955+476 07332-195101| 40 40 40 40| 1357+769 07332-195230| 40 40 40 40| End of listing. =========================================================== Last observations Observation listing from file ./rd0709.skd for experiment RD0709 Source Start DURATIONS name yyddd-hhmmss Kk Ny Tc Wf Wz ...... 1128+385 07333-175302| 41 52 52 | 1749+096 07333-175505| 143 164 71 164| 2209+236 07333-175837| 77 77 75| End of listing. =========================================================== SKED Summary from file ./rd0709.skd for experiment RD0709 (all scans with at least one subnet station) Average number of obs. per baseline per source(normalized by up-time) = 8.3 Min = 0.0 Max = 110.8 (Baseline Ny-Tc on 3C446 ) RMS = 11.9 Total time: 1440 minutes ( 24.0 hours). Key: Kk=KOKEE Ny=NYALES20 Tc=TIGO Wf=WESTFORD Wz=WETTZELL Kk Ny Tc Wf Wz Avg % obs. time: 47 57 24 56 49 46 % cal. time: 4 6 2 5 5 4 % slew time: 16 23 4 17 10 15 % idle time: 32 14 70 20 35 35 total # scans: 345 488 137 464 393 365 # scans/hour : 14 20 6 19 16 15 Avg scan (sec): 117 100 151 105 108 115 # data tracks: 32 32 32 32 32 # Mk5 tracks: 32 32 32 32 32 Total GBytes: 2894 3520 1492 3497 3057 2892 Total GB(M5): 2573 3129 1326 3109 2718 2571 # of tapes : 0.1 0.1 0.1 0.1 0.1 tape change times (hhmm): Total number of tapes: 0.7 Total GBytes (M5) recorded: 12854.2 # OF OBSERVATIONS BY BASELINE | Kk Ny Tc Wf Wz StnTotal ----------------------------------- Kk| 287 77 268 219 851 Ny| 70 431 383 1171 Tc| 102 37 286 Wf| 351 1152 Wz| 990 Number of 2-station scans: 66 Number of 3-station scans: 279 Number of 4-station scans: 197 Number of 5-station scans: 14 Total # of scans, observations: 556 2225 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: KOKEE NYALES20 TIGOCONC WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 506.368 Mbits 253.184 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 8.00 MHz 1 16(*2) 32 0.01 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 Kk KOKEE Mark5A Ny NYALES20 Mark5A Tc TIGOCONC Mark5A Wf WESTFORD Mark5A Wz WETTZELL Mark5A =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 3) Kk Ny Tc Wf Kk Ny Tc Wf Ny 40 Ny 30 Tc 25 25 Tc 20 20 Wf 40 40 25 Wf 30 30 20 Wz 40 40 25 40 Wz 30 30 20 30 ====================================================================== DISK MODULE CHANGES ====================================================================== This session will require 1 or 2 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 may have to change modules during this session, and plan accordingly. There are a few of things to consider: 1) It is desriable to precondition all modules ahead of time that you will use for the session. Recording often works better if the modules have been preconditioned since their last shipment. If you don't have time to precondition all the modules that are needed, plus one or two spares, please precondition as many as you can. 2) 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. Unfortunately it is not possible to predict the module change times exactly. For various reasons, a module can be finished at a different time, usually earlier than expected. As long as a module does not end a great deal earlier than expected, this should not cause a problem. 3) 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 possible after it is called for, because then a new one is available in case the module in use should end prematurely for some reason. If you have any questions, please contact Ed Himwich (Ed.Himwich@nasa.gov).