! Example sched input for a simple VLBA observation using ! the DDC personality of the RDBE. ! ! A couple of capabilities such as setting freq in the schedule ! are demonstrated/tested. ! ! Some modifications for the freq setting. Sept. 30, 2013 RCW ! ! ========================================================== ! ================= Cover Information ==================== ! ========================================================== ! version = 1 expt = 'RDBE_DDC test' expcode = egddc piname = 'Craig Walker' address1 = 'National Radio Astronomy Observatory' address2 = 'P. O. Box O' address3 = 'Socorro, New Mexico, 87801' address4 = ' U.S.A. ' phone = '505 835 7247 ' obsphone = '505 835 7247 ' email = cwalker@nrao.edu fax = '505 835 7027 ' obsmode = '6cm 128-4-2 ' obstype = VLBA note1 = ' ' ! ========================================================== ! ============== Correlator Information ================== ! ========================================================== correl = Socorro coravg = 4 corchan = 128 cornant = 10 corpol = on corwtfn = uniform corsrcs = standard cortape = FTP corship1 = 'Craig Walker' corship2 = 'P. O. Box O' corship3 = 'Socorro NM 87801' ! ========================================================== ! ================== Program control ===================== ! ========================================================== ! Normally SCHED will not overwrite preexisting files. ! If you want this protection, comment this following line. overwrit sumitem = el1, az1, disk, tpstart ! ========================================================== ! ======= Standard Source and Station Catalogs ============ ! ========================================================== ! These are sched defaults so they are not really needed. stafile = $SCHED/catalogs/stations_RDBE.dat srcfile = $SCHED/catalogs/sources.vlba freqfile = $SCHED/catalogs/freq_RDBE.dat ! ========================================================== ! ======================= Setup file ===================== ! ========================================================== ! ! The DDC personality in the RDBE allows far more tuning ! flexibility then the PFB personality. But there are ! restrictions on the actual frequencies that can be chosen. ! ! ! The first processing step breaks the 512 MHz wide IF (512 ! to 1024 MHz) into three blocks (512-640, 640-896, and ! 896-1024 MHz). From there, frequency shifting and filtering ! happens within one of those blocks. We call the boundaries ! between the blocks crossover freqencies. They are fixed and ! a single output baseband channel cannot get good data from ! both sides of one. SCHED will warn of attempts to do so. ! ! The DDC can set frequencies that are multiples of 1024 MHz (the ! sample rate) divided by powers of 2. The finest setting is ! 0.0596046 Hz. But any frequency that does not have an integer ! number of cycles in one second can cause big problems with ! carrying phase over various events like frequency switches. ! So the settings must be limited to multiples of 15.625 kHz - ! the smallest setting that has an integer number of cycles in a ! second. Such frequencies can be described as N*125 kHz + 0, ! 15.625, 31.250, 46.875, 62.500, 78.125, 93.750, or 109.375 kHz. ! Sched will not accept settings that are not multiples of ! 15.625 kHz. ! Sched will also warn of settings that are not multiples of 250 ! kHz which is the smallest value that is an even multiple of ! 10 kHz. It is wise to stick to multiples of 250 kHz to assure ! that there are no single precision variables that overflow ! somewhere in the processing chain (SCHED is ok - all double ! precision for frequencies). ! Note that any crd files (old system) written for some of these ! DDC frequency settings will have BBC frequencies rounded to the ! nearest 10 kHz as required by the old BBC hardware. ! setini = egvlba.6cm / band = '6cm' ! Observing band. SCHED had frequency. nchan = 4 ! Number of baseband channels. bbfilt = 64.0 ! Bandwidth per baseband channel (MHz) pol = rcp ! RCP, LCP, or DUAL. bits = 2 ! Bits per sample dbe = rdbe_ddc ! Use the DDC personality of the RDBE. netside = L ! Use lower sidebands in the RDBE/DDC. freqref = 4612.0 ! RF = freqref + freqoff (LO will be 4100). freqoff = (128.0-.25), 192.25, 256.25, 320.25 / ! That first value was designed to put the LO just below the ! crossover, but with an offset appropriate for pulse cal ! detection. If a value above 128 had been chosen with the ! lower sideband, the signal would have been taken from the ! wrong pfb filter band. / endset / setini = egvlba.2cm / band='2cm' nchan=4 bbfilt=8.0 pol=LCP bits=2 freqref = 15112.0 dbe = rdbe_ddc sideband = L netside = L freqoff = 192.25, 256.25, 320.25, (384.0-.25) / endset / setini = egddc.7mm / band='7mm' nchan=4 bbfilt=8.0 pol=DUAL bits=2 freqref = 42912.0 dbe = rdbe_ddc sideband = U netside = U freqoff = 192.0, 192.0, 384.0, 384.0 / endset / setini = egddc.90cm / band='90cm' nchan=4 bbfilt=8.0 pol=DUAL bits=2 freqref = 0.0 dbe = rdbe_ddc sideband = U netside = U freqoff = 312.250, 312.250, 320.250, 320.250 / endset / ! ========================================================== ! ================= Initial Scan Information ============= ! ========================================================== year = 1995 month = 7 day = 5 start = 16:00:00 ! ========================================================== ! ======================== The Scans ===================== ! ========================================================== ! This file accumulates uv coverage in 4 bands. ! In the process, it tests the on-line setting of IF, LO, etc ! switches by exercizing the various special cases: ! Receiver has an internal mix (1cm, 7mm, 3mm) ! IF converter has internal filters (6cm new, 2cm) ! IF converter has an optional narrow filter (50cm) ! Also test normal case. ! When not using DWELL, leave time for long slews with GAP. ! Allow a readback test occasionally. ! Only things that change need to be specified. ! First scan - generic 6cm. MK is not up at the start. stations = VLBA_SC, VLBA_HN, VLBA_NL, VLBA_FD, VLBA_LA, VLBA_PT, VLBA_KP, VLBA_OV, VLBA_BR group 4 rep 2 setup = egvlba.6cm source='4C39.25' dwell=4:00 / ! Second scan - 2cm scan. Use freq to test the ability ! to handle lots of digits in the frequency as required for ! fine tuning the DDC. Note, when using freq or bw, it is ! best to either set all channels or only one every time ! each command is given to avoid unexpected behavior with ! the defaults. Note that the last channel would go to the ! wrong side of a crossover if 0.25 were added. setup = egvlba.2cm freq = 15304.015625, 15368.015625, 15432.25, (15496-0.25) / ! Revert to setup values for the frequencies (do all used channels). freq = 0,0,0,0 ! Third and fourth scans pick up the other frequencies. setup = egddc.90cm / setup = egddc.7mm / ! This scan for a readback. Needs 2:20 because of PRESTART rep = 1 setup = egvlba.6cm source='4C39.25' gap=2:20 dwell=4:00 / setup = egvlba.2cm gap=0:00 / ! Loop around all the bands. group 4 rep 5 setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / ! Pick up MK and do some more looping. stations = VLBA_SC, VLBA_HN, VLBA_NL, VLBA_FD, VLBA_LA, VLBA_PT, VLBA_KP, VLBA_OV, VLBA_BR, VLBA_MK ! For one of the following scans, try the label SCANTAG group 28 rep 2 setup = egvlba.6cm source='DA193' gap=4:00 dwell=4:00 / setup = egvlba.2cm gap=0 / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm source='4C39.25' / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / group 28 rep 1 setup = egvlba.6cm source='OQ208' gap=4:00 dwell=4:00 / setup = egvlba.2cm gap=0 / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm source='4C39.25' / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm / setup = egvlba.6cm / setup = egvlba.2cm / setup = egddc.90cm / setup = egddc.7mm /