Session Notes for RD0705 Prepared by A. Bertarini, Univ of Bonn =========================================================== PURPOSE AND GENERAL NOTES =========================================================== The purpose of RD0705 is to determine the effects of polarization leakage in the receivers on the geodetic VLBI measurables. Geodesy observes only right circular polarization, but there is an unavoidable leakage coming from the left circular polarization, which is frequency dependent. The leakage is expected to degrade the geodetic baseline length measurement. RD0705 is designed to measure the leakage at each station involved, sweeping the whole 720 MHz bandwidth in X-band and 140 MHz bandwidth at S-band with 8 MHz and 5 MHz steps, respectively. Leakage is detected by cross-correlation between right-hand circular polarization (RCP) at one antenna and left-hand circular polarization (LCP) at the other antenna. Geodetic stations mostly have only RCP, but measurements of the leakage for these stations are still possible if the antenna at the other end of the baseline has dual-polarization receivers. To obtain the most complete coverage possible of the front-end RF bandwidth, we switch in frequency to obtain a polarization leakage measurement every 8 MHz (5 MHz) with some gaps due to patching constraints at the stations with Mark IV terminals (see also the Special Instructions at the end of these notes). Wettzell will observe INT I07192 and join RD0705 as soon as possible. =========================================================== Parameter values for experiment RD0705 Experiment description: Effects on the geodetic-VLBI measurables due to polarization leakage in Scheduler: A. Bertarini Correlator: BONN Nominal start: 2007-192-19:00:00 Nominal end: 2007-193-18:00:00 Current yyyyddd: 2007192 (2007.53) ( 14293 MJD, WED. 11JUL.) Greenwich sidereal time: 14:17: 0.00 (19: 0: 0 UT) Sun's RA and DEC: 7h 22.7m 22d 4.6 =========================================================== First observations Observation listing from file ./rd0705.skd for experiment RD0705 Source Start DURATIONS name yyddd-hhmmss Pt Kp La Br Fd Sc Nl Ov Mk Hn Mc Nt On Wz Kk Ft Ma Wf Eb OQ208 07192-190000| 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220| OQ208 07192-190421| 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220| OQ208 07192-190842| 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220| ...... OQ208 07192-191724| 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220| ...... 1357+769 07192-200515| 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220 220| ...... 1357+769 07192-201818| 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41 41| End of listing. =========================================================== Last observations Observation listing from file ./rd0705.skd for experiment RD0705 Source Start DURATIONS name yyddd-hhmmss Pt Kp La Br Fd Sc Nl Ov Mk Hn Mc Nt On Wz Kk Ft Ma Wf Eb ...... OJ287 07193-172247| 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200| 0016+731 07193-172648| 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200| ...... 0016+731 07193-173851| 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200| End of listing. =========================================================== SKED Summary from file ./rd0705.skd for experiment RD0705 (all scans with at least one subnet station) Calculating rise/set times for source 1 2 3 4 5 6 7 8 9 10... done. Average number of obs. per baseline per source (normalized by up-time) = 50.7 Min = 0.0 Max = 267.0 (Baseline Ov-Eb on OQ208 ) RMS = 43.3 Total time: 1362 minutes ( 22.7 hours). Key: Pt=VLBA_PT Kp=VLBA_KP La=VLBA_LA Br=VLBA_BR Fd=VLBA_FD Sc=VLBA_SC Nl=VLBA_NL Ov=VLBA_OV Mk=VLBA_MK Hn=VLBA_HN Mc=MEDICINA Nt=NOTO On=ONSALA60 Wz=WETTZELL Kk=KOKEE Ft=FORTLEZA Ma=MATERA Wf=WESTFORD Eb=EB_VLBA Pt Kp La Br Fd Sc Nl Ov Mk Hn Mc Nt On Wz Kk Ft Ma Wf Eb Avg % obs. time: 92 91 92 92 92 91 92 89 88 92 92 90 93 93 88 61 93 92 93 90 % cal. time: 4 4 4 4 4 4 4 4 3 4 4 3 4 4 3 3 4 4 4 4 % slew time: 6 5 6 5 6 6 6 5 3 6 7 6 2 1 2 4 2 3 12 5 % idle time: -2 -1 -2 -1 -2 -1 -2 0 5 -2 -2 0 0 1 6 31 1 0 -8 1 total # scans: 337 335 337 337 337 320 337 330 255 337 303 285 319 311 255 208 294 336 307 309 # scans/hour : 15 15 15 15 15 14 15 15 11 15 13 13 14 14 11 9 13 15 14 14 Avg scan (sec): 223 222 223 223 223 232 223 221 282 223 248 258 237 244 283 239 258 224 246 238 Total GBytes: 3570 3539 3570 3570 3570 3448 3570 3477 2649 3570 3049 2807 3285 3158 2649 2429 2924 3563 3095 3236 Total GB(M5): 3173 3145 3173 3173 3173 3065 3173 3090 2354 3173 2710 2495 2920 2807 2354 2160 2599 3167 2751 2877 # of tapes : 337.0335.0337.0337.0337.0320.0337.0330.0255.0337.0303.0285.0319.0311.0255.0208.0294.0336.0307.0 tape change times (hhmm): Total number of tapes: ***** Total GBytes (M5) recorded: 54659.0 # OF OBSERVATIONS BY BASELINE | Pt Kp La Br Fd Sc Nl Ov Mk Hn Mc Nt On Wz Kk Ft Ma Wf Eb StnTotal --------------------------------------------------------------------------------------------------------- Pt| 335 337 337 337 320 337 330 255 337 303 285 319 311 255 208 294 336 307 5543 Kp| 335 335 335 318 335 330 255 335 301 283 317 309 255 206 292 334 305 5515 La| 337 337 320 337 330 255 337 303 285 319 311 255 208 294 336 307 5543 Br| 337 320 337 330 255 337 303 285 319 311 255 208 294 336 307 5543 Fd| 320 337 330 255 337 303 285 319 311 255 208 294 336 307 5543 Sc| 320 313 238 320 286 268 302 294 238 208 277 319 290 5271 Nl| 330 255 337 303 285 319 311 255 208 294 336 307 5543 Ov| 255 330 296 278 312 304 255 201 287 329 300 5440 Mk| 255 221 203 237 229 255 126 212 254 225 4240 Hn| 303 285 319 311 255 208 294 336 307 5543 Mc| 285 303 303 221 193 294 302 303 5126 Nt| 285 285 203 177 285 284 285 4831 On| 311 237 207 294 318 307 5344 Wz| 229 199 294 310 307 5240 Kk| 126 212 254 225 4240 Ft| 186 207 195 3479 Ma| 293 294 4984 Wf| 306 5526 Eb| 5184 Number of 2-station scans: 0 Number of 3-station scans: 0 Number of 4-station scans: 0 Number of 5-station scans: 0 Number of 6-station scans: 0 Number of 7-station scans: 0 Number of 8-station scans: 0 Number of 9-station scans: 0 Number of 10-station scans: 0 Number of 11-station scans: 0 Number of 12-station scans: 17 Number of 13-station scans: 1 Number of 14-station scans: 8 Number of 15-station scans: 8 Number of 16-station scans: 9 Number of 17-station scans: 99 Number of 18-station scans: 101 Number of 19-station scans: 94 Total # of scans, observations: 337 48839 =========================================================== Tape types ID Station Tape length Density Passes Pt VLBA_PT Mark5A Kp VLBA_KP Mark5A La VLBA_LA Mark5A Br VLBA_BR Mark5A Fd VLBA_FD Mark5A Sc VLBA_SC Mark5A Nl VLBA_NL Mark5A Ov VLBA_OV Mark5A Mk VLBA_MK Mark5A Hn VLBA_HN Mark5A Mc MEDICINA Mark5A Nt NOTO Mark5A On ONSALA60 Mark5A Wz WETTZELL Mark5A Kk KOKEE Mark5A Ft FORTLEZA Mark5A Ma MATERA Mark5A Wf WESTFORD Mark5A Eb EB_VLBA Mark5A ====================================================================== SPECIAL INSTRUCTIONS ====================================================================== There is NO repatching required. Please remain with your standard geodetic patching. Please ignore suggestions by the IFD procedures that tell you to change your patching. For the Mark IV stations: We use 19 frequency setups. We expect variations in the IF attenuator settings between the frequency setups. The IF attenuator settings need to be determined before the session and edited into the IFD procedures. Unfortunately, IFADJUST most likely will not work properly since we have a lot of RFI. If you need assistance for the determination, please contact Ed Himwich (Ed.Himwich@nasa.gov). The adjustment will take some time (Ed estimated up to 2 hours), so plan for an early start if possible. For antennas with no idle time prior to the start of the experiment, an adjustment window of one hour from 18:00 UT to 19:00 UT with no scheduled recording was planned in. Please ignore the level of VC04 in the setup No. 16 (ifd16) when setting the attenuators since we know that VC04 is wrongly patched in this setup, but is redundant with VC03 and fixing the patching is complicated.