Session Notes for RD0707 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of rd0707 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 20 at X and 15 at S in order to increase the number of observations with TIGO. The schedule uses the 80 best geodetic sources. All stations are fully scheduled, TIGO has a weight factor of 5. Wettzell will observe INT I07255 and join rd0707 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 RD0707 Experiment description: R&D-07 2007 Scheduler: dbb Correlator: HAYSTACK Nominal start: 2007-255-18:00:00 Nominal end: 2007-256-18:00:00 Current yyyyddd: 2007255 (2007.70) ( 14356 MJD, WED. 12SEP.) Greenwich sidereal time: 17:25: 0.00 (18: 0: 0 UT) Sun's RA and DEC: 11h 21.8m 4d 7.2 =========================================================== First observations Observation listing from file ./rd0707.skd for experiment RD0707 Source Start DURATIONS name yyddd-hhmmss Hh Ny On Tc Wf Wz OJ287 07255-180000| 133 133 109 | 1334-127 07255-180301| 102 115 115 | ...... 1357+769 07255-195004| 78 99 99 73| 2145+067 07255-195337| 40 40 40 40| End of listing. =========================================================== Last observations Observation listing from file ./rd0707.skd for experiment RD0707 Source Start DURATIONS name yyddd-hhmmss Hh Ny On Tc Wf Wz ...... OJ287 07256-172404| 132 132 110 | ...... 1958-179 07256-175621| 42 42 40| 1803+784 07256-175843| 40 70 70 40| End of listing. =========================================================== SKED Summary from file ./rd0707.skd for experiment RD0707 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 8.5 Min = 0.0 Max = 188.9 (Baseline Ny-Wf on 1749+096) RMS = 13.9 Total time: 1440 minutes ( 24.0 hours). Key: Hh=HARTRAO Ny=NYALES20 On=ONSALA60 Tc=TIGO Wf=WESTFORD Wz=WETTZELL Hh Ny On Tc Wf Wz Avg % obs. time: 15 35 52 24 34 32 32 % cal. time: 2 5 6 1 4 5 4 % slew time: 34 25 30 2 19 16 22 % idle time: 47 34 11 71 41 46 42 total # scans: 170 456 495 108 359 467 342 # scans/hour : 7 19 21 5 15 19 14 Avg scan (sec): 77 66 90 191 82 59 94 Total GBytes: 945 2169 3214 1488 2131 1989 1989 Total GB(M5): 840 1928 2857 1323 1894 1768 1768 # of tapes : 0.1 0.1 0.1 0.1 0.1 0.1 tape change times (hhmm): Total number of tapes: 0.9 Total GBytes (M5) recorded: 10609.7 # OF OBSERVATIONS BY BASELINE | Hh Ny On Tc Wf Wz StnTotal ---------------------------------------- Hh| 86 141 57 90 143 517 Ny| 418 57 307 382 1250 On| 72 302 452 1385 Tc| 97 71 354 Wf| 277 1073 Wz| 1325 Number of 2-station scans: 46 Number of 3-station scans: 188 Number of 4-station scans: 237 Number of 5-station scans: 83 Number of 6-station scans: 6 Total # of scans, observations: 560 2952 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: HARTRAO NYALES20 ONSALA60 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 Hh HARTRAO Mark5A Ny NYALES20 Mark5A On ONSALA60 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) Hh Ny On Tc Wf Hh Ny On Tc Wf Ny 40 Ny 30 On 40 40 On 30 30 Tc 20 20 20 Tc 15 15 15 Wf 40 40 40 20 Wf 30 30 30 15 Wz 40 40 40 20 40 Wz 30 30 30 15 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).