! GB GAINS FILE ! ! ! ! The file contains one group of input records for each station/band. ! There is a time range associated with each group that corresponds to a ! period during which the calibration values should have been stable. A ! new group is begun whenever there is a receiver change or some antenna ! change (such as subreflector changes) that might alter the gains. ! The values for the gains are averages of all data taken during the ! timerange. ! ! Individual "GAIN" lines can be extracted from this file and used ! for data calibration with programs ANCAL (AIPS) or CAL (Caltech). ! ! The parameters are: ! BAND Frequency band. Needed to distinguish sx. ! TIMERANG Range of times for which the parameters apply. ! (yr1,month1,day1,hour1,yr2,month2,day2,hr2). ! FREQ Frequency in MHz. ! COMMENT May contain a reason for new timerange. ! Station Name The two letter code for the station. ! GAIN A record type flag for ANCAL and CAL. ! ALTAZ Mount type for ANCAL and CAL. ! DPFU The RCP and LCP sensitivities (K/Jy). ! POLY Coefficients (up to 7) for a polynomial gain curve. ! / End of an input group. ! ! ----------------------------------------------------------------------------- ! ! BAND = '90cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 327 COMMENT = '' GB GAIN ALTAZ DPFU = 2.035, 2.035 POLY= 1.000 / !Assumes 71.3% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '90cm' TIMERANG = 2003,11,01,00, 2100,01,01,00 FREQ = 327 COMMENT = '' GB GAIN ALTAZ DPFU = 2.0 , 2.0 POLY= 1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '50cm' TIMERANG = 2003,11,01,00, 2100,01,01,00 FREQ = 600 COMMENT = '' GB GAIN ALTAZ DPFU = 2.0 , 2.0 POLY= 1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '20cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 1440 COMMENT = '' GB GAIN ALTAZ DPFU = 2.035, 2.035 POLY= 1.000 / !Assumes 71.3% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '20cm' TIMERANG = 2003,11,01,00, 2004,04,21,00 FREQ = 1440 COMMENT = '' GB GAIN ALTAZ DPFU = 2.0 , 2.0 POLY= 1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '20cm' TIMERANG = 2004,04,21,00, 2100,01,01,00 FREQ = 1440 COMMENT = '' TS = 18.5., 18.5 TCAL = 2.13, 1.13 GB GAIN ALTAZ DPFU = 1.81 , 2.06 POLY= 0.96575, 1.8256E-03, -2.4477E-05 / BAND = '18cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 1665 COMMENT = 'as per LS' GB GAIN ALTAZ DPFU = 2.035, 2.035 POLY= 1.000 / !Assumes 71.3% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '18cm' TIMERANG = 2003,11,01,00, 2100,01,01,00 FREQ = 1665 COMMENT = '' GB GAIN ALTAZ DPFU = 2.0 , 2.0 POLY= 1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '13cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 2262 COMMENT = '' GB GAIN ALTAZ DPFU = 2.035, 2.035 POLY=1.000 / !Assumes 71.3% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '13cm' TIMERANG = 2003,11,01,00, 2004,04,19,00 FREQ = 2262 COMMENT = '' GB GAIN ALTAZ DPFU = 2.0 , 2.0 POLY=1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '13cm' TIMERANG = 2004,04,19,00, 2100,01,01,00 FREQ = 2262 COMMENT = '' TS = 19.5, 19.5 TCAL = 2.15, 2.10 GB GAIN ALTAZ DPFU = 1.75 , 1.91 POLY=0.97935, 1.1154E-03, -1.7833E-05 / !LOS 08MAR05 - Corrected POLY description (had "==" instead of "=") BAND = '6cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 4998 COMMENT = '' GB GAIN ALTAZ DPFU = 2.000, 2.000 POLY=1.000 / !Assumes 70.0% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '6cm' TIMERANG = 2003,11,01,00, 2004,03,08,00 FREQ = 4998 COMMENT = '' GB GAIN ALTAZ DPFU = 1.9 , 1.9 POLY=1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '6cm' TIMERANG = 2004,03,08,00, 2100,01,01,00 FREQ = 4998 COMMENT = '' TS = 20., 20. TCAL = 3.29, 2.80 GB GAIN ALTAZ DPFU = 1.82 , 1.91 POLY=0.93999, 3.4857E-03, -5.0846E-05 / BAND = '4cm' TIMERANG = 2002,01,01,00, 2003,11,01,00 FREQ = 8418 COMMENT = '' GB GAIN ALTAZ DPFU = 2.00, 2.00 POLY=1.000 / !Assumes 70.0% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '4cm' TIMERANG = 2003,11,01,00, 2004,06,10,00 FREQ = 8418 COMMENT = '' GB GAIN ALTAZ DPFU = 1.87, 1.87 POLY=1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 BAND = '4cm' TIMERANG = 2004,06,10,00, 2100,01,01,00 FREQ = 8418 COMMENT = '' TS = 31., 32. TCAL = 3.10, 3.39 GB GAIN ALTAZ DPFU = 1.97, 2.08 POLY=0.95899, 2.6531E-03, -4.1662E-05 / BAND = '2cm' TIMERANG = 2002,01,01,00, 2004,09,25,00 FREQ =15363. COMMENT = 'New receiver' GB GAIN ALTAZ DPFU = 1.855, 1.855 POLY=1.000 / !Assumes 65.0% efficiency, est. by J.Ulvestad May24,2002 based on GBT on-line !documentation BAND = '2cm' TIMERANG = 2004,09,25,00, 2100,01,01,00 FREQ =15360. COMMENT = 'New calibration' TS = 31., 28. TCAL = 1.61, 2.75 GB GAIN ALTAZ DPFU = 1.93, 1.78 POLY=0.90235, 5.2533E-03, -7.1736E-05 / !LOS 31OCT03 - Assumes table given by F Ghigo updated Sept 2004 BAND = '1cm' TIMERANG = 2000,01,01,00, 2002,03,28,00 FREQ =22236 COMMENT = '' TS = 50, 50 TCAL = 4.5, 5.2, GB GAIN ALTAZ DPFU=1.71,1.71 POLY= 0.444, 0.0279, -3.65E-04 / ! gain curve based on March 2002 data: no FEM surface adjustments. ! this applies to all data taken befor March 2002, when there was no FEM model applied. BAND = '1cm' TIMERANG = 2002,03,28,00, 2006,12,15,00 FREQ =22236 COMMENT = '' TS = 50., 50. TCAL = 4.33, 5.21 GB GAIN ALTAZ DPFU=1.81, 1.68 POLY=0.815, 0.0097, -1.273E-04 / ! update 2008 including measurements of Dec 2005: FEM surface, no zernickes ! these apply to all data March 28 2002 to Dec 2006 ! These values are corrected for atmospheric absorption. BAND = '1cm' TIMERANG = 2006,12,15,00, 2100,01,01,00 FREQ =22236 COMMENT = '' TS = 50., 50. TCAL = 3.83, 4.97 GB GAIN ALTAZ DPFU=1.74, 1.74 POLY=0.910, 0.00434, -5.22E-05 / ! update 2008 : FEM surface, with zernickes ! these apply to all data taken since Dec 15, 2006. ! These values are corrected for atmospheric absorption. BAND = '7mm' TIMERANG = 2003,11,01,00, 2003,11,22,00 FREQ =43000 COMMENT = '' GB GAIN ALTAZ DPFU=1.0 ,1.0 POLY=1.000 / !LOS 31OCT03 - Assumes table given by F Ghigo 14/08/03 ! prior to Nov 2003, we have no idea what the gain was for 7mm BAND = '7mm' TIMERANG = 2003,11,22,00, 2005,04,11,00 FREQ =43124 COMMENT = '' TS = 55., 55. TCAL = 5.25, 6.00 GB GAIN ALTAZ DPFU=1.22 ,1.22 POLY=0.64253,0.015724, -8.7609E-05, -1.7117E-06 / !FDG update 2008 including measurements of Nov 2003: FEM surface, no zernickes !FDG Note: These values are corrected for atmospheric absorption. BAND = '7mm' TIMERANG = 2005,04,11,00, 2100,01,01,00 FREQ =43124 COMMENT = '' TS = 70., 80. TCAL = 9.37, 9.81 GB GAIN ALTAZ DPFU=1.31 ,1.25 POLY=0.7611 ,0.00985 , -1.0186E-04 / !FDG update 2008 including measurements of Apr 2005: FEM surface, with zernickes ! TCals are for beam #1 !FDG Note: These values are corrected for atmospheric absorption.