EVN Network Monitoring Experiment (NME) Pipeline Feedback
Pipeline feedback for experiment N03L3_1.
If you have any comments on this experiment please email
the
address below.
Last updated: Mon Dec 15 10:45:19 CET 2003
zparagi@jive.nl
|
General Comments.
(
Brief data summary and
scan listing.)
L-band NME observed on 7-8 November 2003 (session 3/2003). This experiment was recorded at 256 Mbps. Effelsberg and Westerbork used Mk5. In the second scan the Westerbork data were transfered to JIVE and recorded there on Mk5. Noto, Medicina, and Onsala recorded on Mk5 and tape. Cambridge did not participate. In Torun the recorder was broken. Noto also sent disk pack but the tape was processed (because tape was used in the session). Tracks 2 and 3 were dead, two channels had to be flagged. This affected all experiments. The first scan was scheduled for Arecibo. Urumqi, Shanghai and Hartebeesthoek could not see the source. Shanghai finished the observations one hour earlier because all sources were below the horizon. This is a preliminary pipeline processed with Tcal information from session 2/2003. Please send new rxg files to JIVE.
The ratio of expected to the observed number of visibilities is estimated as ERI = 0.560 (Ar=1 (1/13), Ef=1, Mc=1, Jb=1, Wb=1, On=1, Nt=0.75, Ur=0.75 (12/13), Sh=1 (10/13), Hh=1 (12/13), Tr=0, Cm=0). Some stations observed only in part of the experiment, which is also indicated. The data losses were all due to technical problems. Leaving out telescopes that did not participate in the observations at all (Tr,Cm), the ERI would have been 0.895.
Plots of the autocorrelations.
Comments.
Ef: some weak RFI
Mc: strong RFI near 1651 MHz (LCP+RCP), weaker RFI near 1638 MHz (RCP) and near 1646 MHz (LCP+RCP)
Nt: two channels missing because of two dead tracks.
On: the autocorrelation amplitude is very low due to not ideal sampler statistics. Probably the whole session was affected. Some RFI.
Sh: Strong RFI at 1636.803 MHz in RCP only.
Ur: BBC2 and 4 have low autocorrelation amplitude, due to not ideal sampler statistics. Some RFI.
Hh: Strong RFI at 1643.053 MHz in both LCP and RCP.
Plots of the uncalibrated amplitude and phase against time.
Comments.
Nt: R1 and R3 missing due to the dead tracks, see note above.
Ur: R2 and R4 are the channels with bad sampler statistics, see note above.
Plots of the uncalibrated amplitude and phase against frequency
channel.
Comments.
Nt: R1 and R3 missing due to the dead tracks, see note above. The bandpass was far from ideal.
Ur: R2 and R4 are affected by bad sampler statistics, see note above.
Hh: L3/R3 have low amplitude, probably due to the reduced sensitivity because of the strong RFI (seen in autocorrelation).
The uncalibrated amplitude and phase of the crosshand
correlations against frequency channel.
Comments.
TSYS against time.
Comments.
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.
Mc: R3 and 4 were a bit less sensitive than expected (SEFD=600 Jy, see the EVN Status Tables). This might be caused by the RFI seen in autocorrelation.
Ur: RCP much less sensitive than expected (SEFD=240 Jy)
Sh: RCP less sensitive than LCP, known receiver problem
Fringe-fit phase solutions (including Parallactic Angle
correction).
Comments.
Fringe-fit delay solutions.
Comments.
Fringe-fit rate solutions.
Comments.
Telescope bandpasses.
Comments.
Bandpass edges were flagged. Nt had a dip in the middle of each channel.
Calibrated amplitude and phase against time
(a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Calibrated amplitude and phase against frequency channel.
Comments.
Jb: channels 3L/4L (especially the former one) had lower amplitude signal. These correspond to BBC3 lower and upper sidebands.
Nt: the bandpass was variable! It was good in 2020+121, 3C84 and DA193 scans - these were used for BPASS calibration. Other sources show uncalibrated bandpasses, which makes the calibration unreliable.
Naturally weighted dirty map produced before self-cal of:
DA193.
3C84.
J0310+3814.
J0518+3306.
J0607+4739.
2029+121.
Comments.
Uniformly weighted dirty map produced before self-cal of:
DA193.
3C84.
J0310+3814.
J0518+3306.
J0607+4739.
2029+121.
Comments.
Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Comments.
Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
Also available as a text file.
Comments.
Jb: Channels 3L/4L had high corrections (a factor of 1.60/1.25 in Tsys). See note on low amplitude from BBC3 above.
Nt: very large corrections (up to a factor of 6-7 in Tsys). All channels were much less sensitive than expected.
Ur: large corrections in all channels. These correspond to factors of 0.3-2 in Tsys.
Sh: RCP was less sensitive due to a receiver problem.
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.
Mc: R3 and 4 were a bit less sensitive than expected.
Ur: RCP low sensitivity (mentioned above) corrected for by Tsys.
Nt: seems to be much less sensitive than expected.
Sh: RCP less sensitive than LCP, known receiver problem.
Residual closure phase (visibility closure phase with model closure phase subtracted) for:
DA193.
3C84.
J0310+3814.
J0518+3306.
J0607+4739.
2029+121.
Comments.
Calibrated visibilities and the source model of:
DA193.
3C84.
J0310+3814.
J0518+3306.
J0607+4739.
2029+121.
Comments.
Calibrated visibilities against u,v distance for:
DA193. postscript , png (smaller)
3C84. postscript , png (smaller)
J0310+3814. postscript , png (smaller)
J0518+3306. postscript , png (smaller)
J0607+4739. postscript , png (smaller)
2029+121. postscript , png (smaller)
Comments.
u,v coverage for:
DA193
postscript, png (smaller)
3C84
postscript, png (smaller)
J0310+3814
postscript, png (smaller)
J0518+3306
postscript, png (smaller)
J0607+4739
postscript, png (smaller)
2029+121
postscript, png (smaller)
Comments.
Crude map of DA193 from the pipeline.
Crude map of 3C84 from the pipeline.
Crude map of J0310+3814 from the pipeline.
Crude map of J0518+3306 from the pipeline.
Crude map of J0607+4739 from the pipeline.
Crude map of 2029+121 from the pipeline.
Comments.