Session Notes for RD0708 Prepared by D. Behrend, NVI, Inc./GSFC =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of rd0708 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 and Hobart. The latter two stations have SNRs of 25 at X and 20 at S in order to increase their number of observations. The schedule uses the 80 best geodetic sources. All stations are fully scheduled, Hobart and TIGO have a weight factor of 5. Wettzell will observe INT I07297 and join rd0708 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 RD0708 Experiment description: R&D-08 2007 Scheduler: dbb Correlator: HAYSTACK Nominal start: 2007-297-18:00:00 Nominal end: 2007-298-18:00:00 Current yyyyddd: 2007297 (2007.81) ( 14398 MJD, WED. 24OCT.) Greenwich sidereal time: 20:11: 0.00 (18: 0: 0 UT) Sun's RA and DEC: 13h 55.2m -11d 48.1 =========================================================== First observations Observation listing from file ./rd0708.skd for experiment RD0708 Source Start DURATIONS name yyddd-hhmmss Ft Ho Ny Tc Wf Wz Zc 0235+164 07297-180000| 40 40 40| 0229+131 07297-180059| 40 40| 2145+067 07297-180419| 40 40 40| 1124-186 07297-180426| 389 480 480 | ...... 3C446 07297-195253| 61 61 50 40| CTA26 07297-195607| 57 57 40| End of listing. =========================================================== Last observations Observation listing from file ./rd0708.skd for experiment RD0708 Source Start DURATIONS name yyddd-hhmmss Ft Ho Ny Tc Wf Wz Zc ...... 1519-273 07298-174823| 480 480 259 | ...... 0229+131 07298-175443| 56 45 56 40| 0059+581 07298-175732| 40 40 40 40| End of listing. =========================================================== SKED Summary from file ./rd0708.skd for experiment RD0708 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 6.8 Min = 0.0 Max = 72.0 (Baseline Ho-Tc on 1606+106) RMS = 11.2 Total time: 1438 minutes ( 24.0 hours). Key: Ft=FORTLEZA Ho=HOBART26 Ny=NYALES20 Tc=TIGO Wf=WESTFORD Wz=WETTZELL Zc=ZELENCHK Ft Ho Ny Tc Wf Wz Zc Avg % obs. time: 51 22 32 53 33 31 22 35 % cal. time: 2 2 5 2 4 4 5 3 % slew time: 30 26 21 5 16 11 52 24 % idle time: 16 49 42 39 47 52 20 38 total # scans: 180 156 395 168 323 383 397 286 # scans/hour : 8 7 16 7 13 16 17 12 Avg scan (sec): 243 124 69 271 87 70 48 129 Total GBytes: 3152 1389 1976 3273 2030 1933 1369 2160 Total GB(M5): 2801 1235 1757 2909 1804 1719 1217 1920 # of tapes : 0.1 0.1 0.1 0.1 0.1 0.1 0.1 tape change times (hhmm): Total number of tapes: 1.0 Total GBytes (M5) recorded: 13441.8 # OF OBSERVATIONS BY BASELINE | Ft Ho Ny Tc Wf Wz Zc StnTotal --------------------------------------------- Ft| 27 47 154 136 73 45 482 Ho| 78 35 29 63 108 340 Ny| 38 197 272 305 937 Tc| 132 58 29 446 Wf| 175 128 797 Wz| 306 947 Zc| 921 Number of 2-station scans: 99 Number of 3-station scans: 329 Number of 4-station scans: 159 Number of 5-station scans: 23 Number of 6-station scans: 11 Number of 7-station scans: 0 Total # of scans, observations: 621 2435 =========================================================== Recording mode Name Code GEOSX8N 8F Recording mode setup for: FORTLEZA HOBART26 NYALES20 TIGOCONC WESTFORD WETTZELL ZELENCHK 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 Ft FORTLEZA Mark5A Ho HOBART26 Mark5A Ny NYALES20 Mark5A Tc TIGOCONC Mark5A Wf WESTFORD Mark5A Wz WETTZELL Mark5A Zc ZELENCHK Mark5A =========================================================== SNR Targets Minimum SNR by baseline for multi-baseline scans X-band (margin 5) S-band (margin 3) Ft Ho Ny Tc Wf Wz Ft Ho Ny Tc Wf Wz Ho 25 Ho 20 Ny 40 25 Ny 30 20 Tc 25 25 25 Tc 20 20 20 Wf 40 25 40 25 Wf 30 20 30 20 Wz 40 25 40 25 40 Wz 30 20 30 20 30 Zc 40 25 40 25 40 40 Zc 30 20 30 20 30 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).