Table of contents
- 1. F202A Correlation Report
- 1.1. General information
- 1.2. Fringes
- 1.3. Notes
F202A Correlation Report
General information
- Session info: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/
- Station feedback: http://www3.mpifr-bonn.mpg.de/div/vlbi/globalmm/sessions/oct20/feedback_oct20.asc
Two frequency modes were tested in this experiment. The first 6 scans utilized a special 88 GHz frequency setup since it is used in one of the experiments in this session. Starting from the scan 7 normal 3mm 86GHz frequency setup was used.
Fringes
| Station | Code | Fringes | Plots | Comments |
|---|---|---|---|---|
| Ef | B | yes | 88 GHz: 86 GHz: to On: to Ys:
| Windy and cloudy. Strong wind gusts are a problem for the pointing, |
| On | X | yes | 88 GHz: 86 GHz: f202a_No0008_3C345_BX_RR.pdf
| Сloudy. Tsys* ~ 280 K. The dedicated 3mm receiver is offline due to some problems, instead used 4mm receiver that covers up to 89GHz. It takes ~4 min for it to change LO. Some problems were expected due to this, but the fringe test seems OK. |
| Ys | Y | yes | Very low power from the receiver in the 88 GHz part. Tsys calibration was not working properly. No fringes in 88 GHz part. In 86 GHz part fringes of the same strength in cross pols as in parallel pols, i. e. apparent linear polarization. Reason was quickly found, quarter-wave plates not installed. Fixed before the science part of the session. | |
| Mh | Z | yes | 88 GHz | Cloudy. |
| Pv | P | yes | 86 GHz, a scan from c202a: __________________________________ | Clear sky, but very unstable atmosphere. No fringes found in the whole f202a. The reason was apparently the wrongly set clock, possibly for one second, although correlations with +/-1 sec offsets also did not produce fringes, After the clock reset data from a c202a scan were transferred to confirm EfPv fringes, and they were successfully found, see plots. |
