Table of contents
- 1. C212A Correlation Report
- 1.1. General information
- 1.2. Fringes
- 1.3. Notes
- 1.4. Post-Correlation checks
- 1.4.1. Residuals
- 1.4.2. FITS completeness (pclist)
C212A 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/oct21/feedback_oct21.asc
Fringes
| Station | Code | Fringes | Plots | Comments |
|---|---|---|---|---|
| Ef | B | yes | ||
| Pv | P | yes | ||
| On | X | yes | ||
| Ys | Y | yes | ||
| Mh | Z | yes | ||
| Br | b | yes | ||
| Fd | f | yes | ||
| La | l | yes | ||
| Nl | n | yes | ||
| Ov | o | yes | ||
| Kp | k | yes | ||
| Pt | p | yes | ||
| Mk | m | yes | ||
| Sc | s | 7mm only | ||
| Hn | h | 7mm only | ||
| Gb | G | yes | Problems with vdif thread offset | |
| Nn | N | yes | ||
| Ky | y | |||
| Ku | u | yes | ||
| Kt | t | yes |
Notes
Ky: File /data/c212a/ky/c212a_KVNYS_274071501.vdif VDIF summary failed with return value -5
Kt: File /data/c212a/kt/c212a_KVNTN_274070001.vdif VDIF summary failed with return value -5
GBT issue with RCP polarization
Issue: Strong GBT fringes in LCP found but detection in RCP (tested on scans 189 and 191).
Diagnostics: Inspection of the VDIF structure shows 8 threads as expected, however the threads with odd IDs (representing LCP channels) are offset considerably (> 150 frames). The suspicion was that RCP frames get dropped by DiFX due to these gap sizes exceeding the read buffer sizesi (even though this seems unlikely because of the even-threaded data yields fringes). To check that the RCP data in principle is OK the following tests were done:
- The v2d setup for GBT was split into two separate datastreams; one for LCP and one for RCP:
DATASTREAM GBRCP
{
file=/data/c212a/gb/C212A_GB_No0762_RCP
format=INTERLACEDVDIF/0:1:2:3/5032/2
}
DATASTREAM GBRCP
{
file=/mark6-06_fuse/1/C212A_GB_No0762
format=INTERLACEDVDIF/1:3:5:7/5032/2
}
GBT: threads are offset. Fix with vmux?
Fourfit plot with native 64MHz band stations e.g. BP show only USB channels (4 total instead of 8)
