Notes for RD0402 NRV 040414 ====================================================================== SPECIAL NOTES ====================================================================== This is the second geodetic session recording at 1 Gbit/s. All stations must select Mark 5 in drudg Option 11 and record on Mark 5 modules. Due to the high data rate, this session will record on multiple disk modules. Please see the DISK MODULE CHANGES section below. This schedule was made with a minimum SNR at both bands of 70 in order to provide a set of data that can be used to evaluate the possibility of resolving phase delay ambiguities on all baselines. The achieved SNRs are shown in the SNR MINIMUM AND ACTUAL section below. Stations must run the giga-bit test procedures to ensure you are ready to observe. Please see the TESTING AND SETUP section below. If you have done ANY observing since the previous Gbit session (e.g. rd0401) then you must re-run these test procedures. The S-band frequency sequence is different from the standard one because the channels would otherwise overlap due to the 16 MHz channel bandwidths. Please see the RECORDING MODE section below. ====================================================================== SESSION INFO ====================================================================== Parameter values for experiment RD0402 Experiment description: R&D-2 Scheduler: nrv Correlator: HAYSTACK Nominal start: 2004-112-18:00:00 Nominal end: 2004-113-18:00:00 Schedule file: ./rd0402.skd Process ID: 10021 sked version: 2004Apr07 Printer commands: lj, ljp Current yyyyddd: 2004113 (2004.31)( 13118 MJD, THUR 22APR.) Greenwich sidereal time: 7:51:50.00 (17:47:21 UT) Sun's RA and DEC: 2h 2.9m 12d 29.2 ====================================================================== STATIONS ====================================================================== ID STATION Band SEFD Band SEFD DAT name ID Rack Recorder K Kk KOKEE X 900. S 750. KO-VLBA 102 VLBA4 VLBA4 N Ny NYALES20 X 900. S 1200. RICHMOND 66 Mark4 Mark4 E Wf WESTFORD X 1500. S 1400. WESTFORD 07 Mark4 Mark4 V Wz WETTZELL X 750. S 1115. WETTZELL 33 Mark4 Mark4 ====================================================================== OBSERVATION SUMMARY ====================================================================== SKED Summary from file ./rd0402.skd for experiment RD0402 (all scans with at least one subnet station) Average number of obs. per baseline per source (normalized by up-time) = 13.3 Min = .0 Max = 135.0 (Baseline Ny-Wz on 1741-038) RMS = 17.3 Total time: 1429 minutes ( 23.8 hours). Key: Kk=KOKEE Ny=NYALES20 Wf=WESTFORD Wz=WETTZELL Kk Ny Wf Wz Avg % obs. time: 21 43 26 35 31 % cal. time: 2 6 3 5 4 % slew time: 12 27 17 14 17 % idle time: 63 22 52 44 45 total # scans: 256 531 338 431 389 # scans/hour : 10 22 14 18 16.2 Avg scan (sec): 70 70 66 70 69 Total GB(M5): 2305 4800 2893 3865 3466 Total GBytes (M5) recorded: 13865.6 # OF OBSERVATIONS BY BASELINE | Kk Ny Wf Wz StnTotal ------------------------------ Kk|256 174 161 67 402 Ny| 531 215 390 779 Wf| 338 177 553 Wz| 431 634 Number of 2-station scans: 440 Number of 3-station scans: 180 Number of 4-station scans: 34 Total # of scans, observations: 654 1184 ====================================================================== RECORDING MODE ====================================================================== Name Code GEOSX8F 8F Recording mode setup for: KOKEE NYALES20 WESTFORD WETTZELL Mode Tot.Rate Tot.BandW #chan #bits Barrel Mk341:2 1024.000 Mbits 512.000 MHz 14 2 NONE Chan.BW #Subpasses Tracks(*fan) Tot.tracks Speed 16.00 MHz 1 16(*2) 32 320.00 X-band spanned bw= 720.0 MHz rms spanned bw= 280.4 MHz S-band spanned bw= 125.0 MHz rms spanned bw= 50.7 MHz Effective number of channels recorded per sub-pass X S Total 19.780 11.868 32.000 Chan# Skyfreq BBC# 1 8212.99 1 2 8252.99 2 3 8352.99 3 4 8512.99 4 5 8732.99 5 6 8852.99 6 7 8912.99 7 8 8932.99 8 9 2213.99 9 10 2243.99 10 11 2288.99 11 12 2303.99 12 13 2358.99 13 14 2383.99 14 ====================================================================== SNR MINIMUM AND ACTUAL ====================================================================== Minimum SNR by baseline for multi-baseline scans X-band (margin 0) S-band (margin 0) Kk Ny Wf Kk Ny Wf Ny 70 Ny 70 Wf 70 70 Wf 70 70 Wz 70 70 70 Wz 70 70 70 SKED Summary from file ./rd0402.skd for experiment RD0402 (all scans with at least one subnet station) SNR histogram Distribution of X-band SNRs, for each baseline SNR: 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 >> Kk-Ny: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 4 3 152 Kk-Wf: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 30 20 6 105 Kk-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11 0 0 56 Ny-Wf: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 23 5 2 185 Ny-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17 15 16 342 Wf-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20 1 3 153 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 116 45 30 993 Total number of obs: 1184 Average SNR: 177.1 Median SNR bin: 90 Distribution of S-band SNRs, for each baseline SNR: 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 >> Kk-Ny: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 82 36 8 48 Kk-Wf: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 75 11 4 71 Kk-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 1 0 9 Ny-Wf: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 116 2 20 77 Ny-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 222 18 23 127 Wf-Wz: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 99 14 12 52 Total 0 0 0 0 0 0 0 0 0 0 0 0 0 0 651 82 67 384 Total number of obs: 1184 Average SNR: 87.0 Median SNR bin: 75 ====================================================================== 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 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).