TPTCSPNT_080219 -- KA/CCB half power tracks in windy conditions.
Start block "ccbHalfPower1.sb"
-- Observing 3C454.3 aka 2253+1608 (est flux at 32GHz is 16.5 Jy)
Users astrid on Titania is not showing the gfm display,
although it appears on the operators screen.
Called in Ron G. to diagnose. He's not sure what was going on.
Restarted astrid on Titania -- now all working ok.
Set relaxed heuristics.
Scans 3-11 Did two peak/focuses - rather erratic results.
Wind alarm > 37 MPH : antenna put in survival mode.
Starting again at UT=16:15
Scans 12-16 peak/focus
Scans 17- 21 calibration at +AZ (no good)
22 = half-power track on 2253+1608 at +AZ (25 min) start=16:20:57 2008_02_19_16:20:57.fits (az=123-131, el=56-59)
23-27 peak/focus
28-32 calibration at +EL (reasonable looking cal)
33 half-power track at +EL (25 min) start=16:54:58 2008_02_19_16:54:58.fits (az=135-146, el=61-64)
queue up a final scan in +AZ offset.
34-38 peak/focus
39-43 calibration at +AZ (no good)
44 half-power at +AZ 30 minutes long, start=17:27:52 2008_02_19_17:27:52.fits (obsc_az=150-168, obsc_el=65-67)
all done at 17:58 UT
Scan 33 produced a reasonable calibration, giving a slope of 30.5 counts/arcsec.
The others didn't have sensible calibrations, but I will use 30.5 for all of them.
Table : average power levels in counts for the calibration scans.
| offset | | scans 17-21 | scans 28-32 | scans 39-43 |
| (HPBW) | | +AZ Cal | +EL | +Az again |
| 0.0 | | 198 | 461 | 235 |
| +0.4 | | 397 | 354 | 167 |
| +0.5 | | 341 | 309 | 61 |
| +0.6 | | 399 | 235 | 344 |
| +10 | | 17 | 31 | 16 |
- the Ascii dump for all 3 scans, as a gzipped tar file may be downloaded through the link at the bottom of the page: "Feb19_hptracks.tar.gz
- H.P. track scan 22, offset in AZ (25 min):
- QD and wind for scan 22: (the wind speeds are in meters/sec)
- H.P. track scan 33, offset in EL (25 min):
- QD and wind for scan 33:
- H.P. track scan 44, offset in AZ (30 min):
- QD and wind for scan 44:
-- FrankGhigo - 19 Feb 2008
Feb19_hptracks.tar.gz 
Feb19_s22.gif 
