Session Notes for RD0706 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of rd0706 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 25 at X-band and 20 at S-band (identical to CONT05 SNRs), and it uses the 80 best geodetic sources. All stations are fully scheduled. Wettzell will observe INT I07220 and join rd0706 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 RD0706 Experiment description: R&D-06 2007 Scheduler: dbb Correlator: HAYSTACK Nominal start: 2007-220-18:00:00 Nominal end: 2007-221-18:00:00 Current yyyyddd: 2007220 (2007.60) ( 14321 MJD, WED. 8AUG.) Greenwich sidereal time: 15: 7: 0.00 (18: 0: 0 UT) Sun's RA and DEC: 9h 13.1m 16d 5.7 =========================================================== First observations Observation listing from file ./rd0706.skd for experiment RD0706 Source Start DURATIONS name yyddd-hhmmss Mc Ny Sv Wf Wz 1606+106 07220-180000| 40 40 40 40 | 4C39.25 07220-180338| 40 40 40 40 | ...... 3C371 07220-195042| 40 49 40 49 46| 1606+106 07220-195438| 40 40 40 40 40| End of listing. =========================================================== Last observations Observation listing from file ./rd0706.skd for experiment RD0706 Source Start DURATIONS name yyddd-hhmmss Mc Ny Sv Wf Wz ...... 0059+581 07221-175527| 40 40 40 40 40| 1803+784 07221-175804| 40 40 40 40 40| End of listing. =========================================================== SKED Summary from file ./rd0706.skd for experiment RD0706 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 10.1 Min = 0.0 Max = 118.8 (Baseline Ny-Wf on 1606+106) RMS = 11.9 Total time: 1439 minutes ( 24.0 hours). Key: Mc=MEDICINA Ny=NYALES20 Sv=SVETLOE Wf=WESTFORD Wz=WETTZELL Mc Ny Sv Wf Wz Avg % obs. time: 26 28 25 23 26 26 % cal. time: 7 7 6 5 6 6 % slew time: 36 24 62 17 10 30 % idle time: 30 41 6 53 57 38 total # scans: 562 567 537 462 534 532 # scans/hour : 23 24 22 19 22 22 Avg scan (sec): 40 43 40 44 43 41 Total GBytes: 1622 1736 1556 1448 1640 1600 Total GB(M5): 1441 1543 1383 1287 1458 1422 # 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: 7112.3 # OF OBSERVATIONS BY BASELINE | Mc Ny Sv Wf Wz StnTotal ----------------------------------- Mc| 546 519 443 523 2031 Ny| 534 451 519 2050 Sv| 419 492 1964 Wf| 422 1735 Wz| 1956 Number of 2-station scans: 7 Number of 3-station scans: 29 Number of 4-station scans: 174 Number of 5-station scans: 373 Total # of scans, observations: 583 4868 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: MEDICINA NYALES20 SVETLOE 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 Mc MEDICINA Mark5A Ny NYALES20 Mark5A Sv SVETLOE 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) Mc Ny Sv Wf Mc Ny Sv Wf Ny 25 Ny 20 Sv 25 25 Sv 20 20 Wf 25 25 25 Wf 20 20 20 Wz 25 25 25 25 Wz 20 20 20 20 ====================================================================== 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 (weh@ivscc.gsfc.nasa.gov).