! Example sched input for a simple VLBA observation. ! This is egvlba.key modified to use the RDBE with the ! DDC personality in the case where there are 2 RDBE's ! at a station. ! ! ========================================================== ! ================= Cover Information ==================== ! ========================================================== ! version = 1 expt = 'RDBE_DDC test' expcode = egddc2 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. ! stations_RDBE.dat now has all VLBA stations with 2 RDBEs ! There is no longer a stations_RDBE2.dat. stafile = $SCHED/catalogs/stations_RDBE.dat srcfile = $SCHED/catalogs/sources.gsfc.2015feb 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 by the DDC personality is to break ! 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 should be limited to multiples of 15.625 kHz - ! the smallest setting that has an integer number of cycles in a ! second. This can be looked at 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. ! 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 hardware. ! ! Do a 4 IF case. setini = egrdbe2.6cm / ! 512 MHz (2 Gbps band = '6cm' ! Observing band. SCHED had frequency. nchan = 8 ! Number of baseband channels. bbfilt = 64.0 ! Bandwidth per baseband channel (MHz) pol = dual ! RCP, LCP, or DUAL. bits = 2 ! Bits per sample format = 'VDIF' ! Needed for 2 RDBEs. dbe = rdbe_ddc ! Use the DDC personality of the RDBE. netside = U ! Use upper sidebands in the RDBE/DDC. ! RF = freqref + freqoff (LO will be 4100). ! freqref = 4612, 4612, 4612, 4612, 6412, 6412, 6412, 6412 ! freqoff = 192.25, 192.25, 256.25, 256.25, 196.25, 196.25, 256.25, 256.25 ! Try 6 channels to one IF pair and 2 to the other freqref = 4612, 4612, 4612, 4612, 4612, 4612, 6412, 6412 freqoff = 188.25, 188.25, 250.25, 250.25, 312.25, 312.25, 256.25, 256.25 / endset / ! The next setup is for 2 IFs, but 8 channels of 8 MHz. setini = egrdbe2.2cm / band='2cm' nchan=8 bbfilt=8.0 pol=dual bits=2 format = 'VDIF' ! Needed for 2 RDBEs. freqref = 15112.0 dbe = rdbe_ddc sideband = L netside = L freqoff = 192.25, 192.25, 200.25, 200.25, 208.25, 208.25, 216.25, 216.25 / endset / ! ========================================================== ! ================= Initial Scan Information ============= ! ========================================================== year = 2012 month = 11 day = 21 start = 10:00:00 ! ========================================================== ! ======================== 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 interal 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. stations = VLBA_SC, VLBA_HN, VLBA_NL, VLBA_FD, VLBA_LA, VLBA_PT, VLBA_KP, VLBA_OV, VLBA_BR, VLBA_MK ! A simple schedule. ! group 4 rep 2 setup = egrdbe2.6cm source='4C39.25' dwell=4:00 / rep = 1 setup = egrdbe2.6cm source='4C39.25' gap=2:20 dwell=4:00 / setup = egrdbe2.2cm gap=0:00 / setup = egrdbe2.6cm source='DA193' / setup = egrdbe2.2cm / group 2 rep 10 setup = egrdbe2.6cm source='4C39.25' / setup = egrdbe2.2cm /