Proj: TBASE_071108 C-band commissioning. Weather: clear; T=-4C Scans Source Proc Comments ------------ ---------- -------- ------------------------------------------------------------ 1-4 0542+4951 Peak LPCs (0.061,0.027); Tsys=16K 5 " Focus Offset = -28.202mm. Old DFC = -13.354mm. New LFC = -14.848mm. 6-25 3C147 OffOn Configure with line4 (4 windows at 9 GHz); 2min integrations We get IF level of 1V on source and 0.5 V off source. 3C147 is about 7 Jy or 14 K; iftarget = 1 26-9 " " Same setup except set iftarget = 3 30-3 " " Same setup except set iftarget = 3; swap CM2 and CM4 34-7 " " Same setup except set iftarget = 3; swap ACS-J3 and ACS-J7 Did not re-balance No change in spectra. It appears that the difference in structure between different ACS bands arises in the Spectrometer. Mabye this is indeed the offset problem that Toney M. has suggested. 38-9 Abort 40-43 3C147 OffOn Configure with line8 (8 spwin; BW=50MHz; freq=5140MHz; 9-level) Looks pretty good. 44-47 " " Configure with line8 (8 spwin; BW=50MHz; freq=5140MHz; 3-level) Looks pretty good. The 50 MHz BW data looked good with no major offsets. Go back to 800 MHz BW. 48-51 " " Configure with line4 (4 spwin; BW=800MHz; freq=5000MHz) 52-5 " " Only change LO1 by 20 MHz (rest = 5020 MHz) No configure; no balance. 56-9 " " Only change LO2 by 20 MHz for CM2/6 and CM4/8 LO2 was changed from 12300 MHz to 12320 MHz Much of the structure does not move when LO1 or LO2 are changed. Switch to X-band for a quick look. 60-63 0542+4951 Peak LPCs (0.025,0.094); Tsys = 24K 64 " Focus Offset = -20.863mm. Old DFC = -19.922mm. New LFC = -0.942mm. 65-8 3C147 OffOn Configure with line 69-80 off_3C147 OffOn Same setup on cold sky.