! ========================================================== ! ========== Example keyin format file for a ============= ! ========== Phase-referenced EVN experiment ============= ! ========== (strong source - 128 Mb/s) ============= ! ========================================================== ! ========================================================== ! ================= Cover Information ==================== ! ========================================================== version = 1 expt = 'Phase-referencing of my favourite strong source' expcode = 'EO999' obstype = 'VLBI' piname = 'A.N. Observer' address1 = 'An Institute' address2 = 'A Street' address3 = 'A Town' address4 = 'A Country' phone = '555 1000' obsphone = '555 1000' email = 'anobserver@institute.country' fax = '555 1001' obsmode = 'Phase-referencing of a source at 18cm (128 Mb/s)' note1 = 'Place additional information here (note2-4 available)' ! ========================================================== ! ============== Correlator Information ================== ! ========================================================== correl = 'JIVE' coravg = 2 corchan = 16 cornant = 8 corpol = 'off' corwtfn = 'uniform' corsrcs = 'from schedule' cortape = 'DAT' corship1 = 'An Institute' corship2 = 'A Street' corship3 = 'A Country' cornote1 = 'Place special requirements here (cornote2-4 available)' ! ========================================================== ! ================== Program control ===================== ! ========================================================== ! Allow SCHED to overwrite existing files overwrit ! Show start elevation and time on source before scan start ! (or how late antennas are on source): ! sumitem = el1, early ! Might prefer to print start and end elevation, time on source ! and slew time in summary file ! !sumitem = el1, el2, dwell, slew ! ========================================================== ! =================== Station Catalog ==================== ! ========================================================== ! Get stations from the DEFAULT catalog stafile = $SCHED/catalogs/stations.dat ! List stations stations = JODRELL1,WSTRBORK,EFLSBERG,ONSALA85,MEDICINA,TORUN, SHANGHAI,URUMQI ! ========================================================== ! =================== Source Catalog ===================== ! ========================================================== ! Get source coordinates for fringe finders, phase-reference ! source, etc, from the DEFAULT catalog ! Standard source catalogs are sources.gsfc and sources.rfc. ! This schedule uses some aliases only in sources.gsfc. srcfile = '$SCHED/catalogs/sources.gsfc' ! But my favourite strong, polarised source isn't in the DEFAULT ! catalog so I shall specify that separately srccat / source='B0218+357' ra=02:21:5.6376 dec=35:56:13.8437 equinox='j2000' / endcat / ! ========================================================== ! ==================== Setup Information =================== ! ========================================================== ! Get frequency information from the DEFAULT catalog freqfile = '$SCHED/catalogs/freq.dat' ! Construct frequency setup ! 4 8-MHz channels, 2-bit sampling and dual polarisation => 128 Mb/s setinit='eo999.18cm' / band='18cm' nchan=4 bbfilter=8 bits=2 pol='dual' pcal='1MHz' barrel=roll_off / endset / ! ========================================================== ! ================= Initial Scan Information ============= ! ========================================================== year=2012 month=12 day=25 start=11:00:00 ! Define the Setup to use for the observations ! ========================================================== ! ======================== The Scans ===================== ! ========================================================== ! ! PHASE REFERENCING is used in this example ! With this low sampling rate and bright target, phase referencing here ! would be useful to obtain absolute position information rather than ! help to detect the source ! ! ! Notes on sources relevant to Polarisation Calibration ! 3C84 - a bright UNPOLARISED source which can be used to ! solve for the instrumental polarisation (D-terms) and the ! RCP/LCP delay difference. The scans cover a wide range ! in parallactic angle - essential for accurate calibration. ! J0521+16 (3C138) - polarisation position angle calibrator. ! This source is monitored regularly at the VLA so that ! its true position angle of the polarisation is known ! => http://www.vla.nrao.edu/astro/calib/polar/ ! Other similar sources can be found in the URL above ! Three scans are used so as to produce an adequate map. ! ! ! AMPLITUDE CALIBRATION - Tsys MEASUREMENTS ! ! For amplitude calibration purposes, at MkIV EVN stations it ! is recommended to insert regular gaps for Tsys calibration ! approximately every 15 minutes. ! The telescopes must be on source by the start of the scan ! after the gap in order to make a valid Tsys calibration. ! ! Here a gap is inserted almost every phase-reference cycle. ! ! NOTE the use of DWELL for all calibrators to ensure that all ! telescopes are ON source before the measurement of Tsys ! and the use of DUR for the phase-reference steps ! ! ! The phase reference cycles are at least 10 minutes long as ! this is the minimum time required by Jb1 (Lovell telescope) ! slewing limitations. ! Should you wish to have a faster cycle (eg for higher frequencies) ! use Jb2 (the mark2 telescope) or you have to omit some of the source ! changes with the Jb1 (Lovell) telescope. An example can be found in ! example -- eg1024.key -- ! ! ! First scan on the phase-calibrator. source='J0204+3649' dur=00:02:00 gap=00:00:00 setup='eo999.18cm'/ ! Cycle the next 2 scans 3 times group 2 repeat 3 source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / ! Cycle the next 2 scans 3 times group 2 repeat 3 source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / ! Includes D-term calibrator and Pol. position angle calibrator source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / source='3C84' dwell=00:08:00 / ! include observations of a fringe-finder (0234+285) ! and a bright unresolved source for amplitude calibration purposes ! (J0205+3212) source '0234+285' dwell=00:08:00 gap=00:01:10 / source 'J0205+3212' dwell=00:08:00 gap=00:01:10 / source='J0204+3649' dwell=00:02:00 gap=00:01:00 / ! Cycle the next 2 scans 6 times group 2 repeat 6 source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / ! Includes D-term calibrator source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / source='3C84' dwell=00:08:00 / source='J0204+3649' dwell=00:02:00 gap=00:01:00 / ! Cycle the next 2 scans 6 times group 2 repeat 6 ! Larger gap because Ur slower slew close to zenith ! source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:50 / ! include observations of a fringe-finder (0234+285) ! and a bright unresolved source for amplitude calibration purposes ! (J0205+3212) source '0234+285' dwell=00:08:00 gap=00:01:10 / source 'J0205+3212' dwell=00:08:00 gap=00:01:10 / source='J0204+3649' dwell=00:02:00 gap=00:01:00 / group 2 repeat 8 source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / ! Includes D-term calibrator source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:40 / source='3C84' dwell=00:08:00 / source='J0521+16' dwell=00:08:00 / source='J0204+3649' dwell=00:02:00 / group 2 repeat 8 ! larger gaps for Tsys calibration ! (large telescope slewing times get longer at higher elevations ! ==> gap increased to 70s) source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / ! include observations of a fringe-finder (DA193) ! a bright unresolved source for amplitude calibration purposes ! (J0205+3212) and a polarization position angle calibrator source 'DA193' dwell=00:08:00 / source 'J0205+3212' dwell=00:08:00 / source='J0521+16' dwell=00:08:00 / source='J0204+3649' dwell=00:02:00 gap=00:00:50 / group 2 repeat 2 source='B0218+357' dur=00:07:10 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / ! Includes D-term calibrator source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / source='3C84' dwell=00:08:00 / source='J0204+3649' dwell=00:02:00 gap=00:01:10 / group 2 repeat 2 source='B0218+357' dur=00:07:00 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / group 4 repeat 2 ! larger gaps for Tsys calibration ! (large telescope slewing times get longer at higher elevations ! ==> gap increased to 70s) source='B0218+357' dur=00:06:50 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / source='B0218+357' dur=00:08:00 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / ! Includes D-term calibrator source='B0218+357' dur=00:07:20 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:01:10 / source='3C84' dwell=00:08:00 / source='J0204+3649' dwell=00:02:00 gap=00:01:10 / group 4 repeat 2 ! larger gaps for Tsys calibration ! (slewing times becoming shorter again) ! ==> gap decreased to 50s) source='B0218+357' dur=00:06:50 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:50 / source='B0218+357' dur=00:08:00 gap=00:00:00 / source='J0204+3649' dur=00:02:00 gap=00:00:50 / source 'J0205+3212' dwell=00:08:00 gap=00:01:10 / source='J0521+16' dwell=00:08:00 / ! ========================================================== ! ====================== End of keyin file =============== ! ==========================================================