GENERAL
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.
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POSSM_AUTOCORR
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.
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VPLOT_UNCAL
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.
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POSSM_UNCAL
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).
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POSSM_CPOL
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TSYS
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GAIN
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
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FRING_PHAS
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FRING_DELAY
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FRING_RATE
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BANDPASS
Bandpass edges were flagged. Nt had a dip in the middle of each channel.
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VPLOT_CAL
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POSSM_CAL
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.
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CALIB_PHAS1
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CALIB_AMP2
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.
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SENS
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.
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CLPHS
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VPLOT_MODEL
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UVCOV
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UVPLT
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ICLN
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