EVN Network Monitoring Experiment (NME) Pipeline Feedback
Last updated: Tue Jul 20 12:32:36 CEST 2004
zparagi@jive.nl
General Comments.
(
Brief data summary
and
scan listing
)
C-band NME observed on 20 May 2004 (session 2/2004). This experiment was
recorded at 256 Mbps using 2-bit sampling which resulted in 32 MHz bandwidth
in each polarization. Van-Vleck correction was not applied to the data.
Shanghai and Torun observed on tape, all others on disk. In Cm there
were fringes only in channels L2-3 and R2-3 due to the microwave link
limitations. Sh had no RCP receiver. Ur could not join the experiment (and most
of the session session) due to a receiver upgrade. In Jb the MarkII telescope
was used.
There were five sources, two-two were observed in
phase-reference mode: 3C273B - 1222+037 (1.8 deg. separation), and 3C345 -
1633+382 (2.3 deg. separation). The reference-target cycle time was 6.5
minutes.
The ratio of the expected to the observed number of good
visibilities is estimated as ERI=ERI*=1.0 (Ef=1.0, Mc=1.0, Jb=1.0, Wb=1.0,
On=1.0, Nt=1.0, Sh=0.5/0.5 (only LCP expected; ~20 minutes gap on VPLOT due to
sources below horizon), Hh=1.0, Tr=1.0, Cm=0.5/0.5 (only ~14 MHz/polarization)).
Plots of the autocorrelations
.
Comments.
Plots of the uncalibrated amplitude and phase against time
.
Comments.
Sources were clearly detected on all baselines. Apparent amplitude variation is due to source switching.
Plots of the uncalibrated amplitude and phase against frequency
channel
.
Comments.
Good data in all channels where expected.
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel
.
Comments.
Westerbork polarization leakage seems to be high. Compare
POSSM_UNCAL/POSSM_CPOL plots on OQ208 (unpolarized source).
TSYS against time
.
Comments.
Apparent quick changes in Tsys was due to quick switching between very bright targets.
Telescope sensitivities
from the a priori TSYS and Gain curves (the square of this
number gives the antenna noise (SEFD) in Jy - the smaller the better).
Comments.
Jb seems to be more sensitive than expected (SEFD=320 Jy). See the EVN Status Table).
Fringe-fit phase solutions
(including Parallactic Angle correction).
Comments.
Fringe-fit delay solutions
.
Comments.
Fringe-fit rate solutions
.
Comments.
Telescope bandpasses
.
Comments.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Some large phase differences seen, especially in the first phase-reference pair, and on the longest baselines.
Calibrated amplitude and phase against frequency channel
.
Comments.
Naturally weighted dirty map produced before self-cal of:
3C273B:
postscript
, or
FITS
.
1222+037:
postscript
, or
FITS
.
3C345:
postscript
, or
FITS
.
1633+382:
postscript
, or
FITS
.
OQ208:
postscript
, or
FITS
.
Comments.
Uniformly weighted dirty map produced before self-cal of:
3C273B:
postscript
, or
FITS
.
1222+037:
postscript
, or
FITS
.
3C345:
postscript
, or
FITS
.
1633+382:
postscript
, or
FITS
.
OQ208:
postscript
, or
FITS
.
Comments.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273B.
1222+037. (not available)
3C345. (not available)
1633+382. (not available)
OQ208. (not available)
Comments.
Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273B:
postscript
, or
text file
.
1222+037: postscript (not available)
, or text file
(not available)
.
3C345: postscript (not available)
, or text file
(not available)
.
1633+382: postscript (not available)
, or text file
(not available)
.
OQ208: postscript (not available)
, or text file
(not available)
.
Comments.
Corrections are in general small. Onsala has some high corrections (up to a factor of 2 in Tsys).
Telescope sensitivities
(the total AMP gain applied during
both a priori and self calibration; the square of this number gives the antenna
noise (SEFD) in Jy).
Comments.
Jb seems to be more sensitive than expected (SEFD=320 Jy). See the EVN Status Table).
Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C273B
.
1222+037
.
3C345
.
1633+382
.
OQ208
.
Comments.
Calibrated visibilities and the source model of:
3C273B
.
1222+037
.
3C345
.
1633+382
.
OQ208
.
Comments.
Calibrated visibilities against u,v distance for:
3C273B.
postscript
, or
png (smaller)
1222+037.
postscript
, or
png (smaller)
3C345.
postscript
, or
png (smaller)
1633+382.
postscript
, or
png (smaller)
OQ208.
postscript
, or
png (smaller)
Comments.
u,v coverage for:
3C273B.
postscript
, or
png (smaller)
1222+037.
postscript
, or
png (smaller)
3C345.
postscript
, or
png (smaller)
1633+382.
postscript
, or
png (smaller)
OQ208.
postscript
, or
png (smaller)
Comments.
3C273B:
postscript
, or
FITS
.
1222+037:
postscript
, or
FITS
.
3C345:
postscript
, or
FITS
.
1633+382:
postscript
, or
FITS
.
OQ208:
postscript
, or
FITS
.
Comments.