TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

EVN Amplitude Calibration

Jun Yang, JIVE

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

Timely delivery of results Timely delivery can significantly speed up the

correlation, post review, and pipeline processes and make more disk packs be available in the upcoming session.

Automatically uploading log files and gps data are very welcome.

Feedbacks, rxg, antab and uvflg files should be delivered within 2 weeks after the end of a session.

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

K-Band EVN Observations Three Russian QUASAR stations will be available. Tr and Ur will get K-band receivers in the next year. Hh is expected to participate in the EVN observation again in the

upcoming Spring.

Current status

Amplitude calibration at 22 GHz does not look as good as at low frequencies.

Opacity-free gain curve is not available at Nt, Ys, Ro, Jb, & Cm.

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

Low correlation amplitude in some BBCs* Nt: 0.75x lower in BBC 1/IF2 in N09M2

Ftp-test fringes to Ef in sick BBC1/USB (left) and healthy BBC3/USB (midle). Right: plot of calibrated amplitude and phase against frequency channelBackground ： auto-correlation plot of BBC1/USB. Note the left unusual spike.

BBC1 BBC3BBC1 BBC3

Sampler: -- - + ++ Sampler: -- - + ++BBC1/LSB (%) 9.8  42.5 12.2  35.5 BBC3/LSB (%) 14.6  35.4 14.3  35.7BBC1/USB (%) 0.0  76.5  1.7  21.8 BBC3/USB (%) 13.6  36.0 14.0  36.4

More: BBC1 in N09M1, BBC7 in N09L3, …

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

BBC1/USB BBC1 BBC3

* Jb: 0.7x lower in BBC3 in N09M2

The self-calibration solution of JbIF median med.err stderr med.err-(med-1) ndataL1 0.9441 0.0559 0.00359 0.0000 107 L2 0.9305 0.0695 0.00344 0.0000 107 L3 1.1715 0.1715 0.00454 0.0000 107 L4 1.2282 0.2282 0.00473 0.0000 107

BBC3/LSB

Here, sampler distribution did not look too bad.

More: BBC 3 in N09L2, N09C2, F09M1, N09L3, …

Standard plots

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

* Tr: 0.6x lower in BBC 4 & 6 in N09L2

BBC (RCP) 1 3 5 7

BBC (LCP) 2 4 6 8

Auto-correlation plots. Terrible wide-band RFI. Not seen in N09L3.

SNR of the ftp-test fringes to Ef

RR (BBC 1,3, 5, 7) 109 106 108 92

LL (BBC 2,4, 6, 8) 103 57 67 104

BBCs did not work properly due to this RFI.

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

More EVN stations* Ur: Low correlation amplitude in LL 7&8 (BBC 7) in the 6 cm

Gbps experiments of Session 2/2009.

* Sh: Low correlation amplitude and clearly S-shape phase bandpass in IF 5-8 (BBC 5-8) in the 6cm Gbps experiments of Session 2/2009.

* Tr: Large error in IF 7&8 (1691 & 1706 MHz) in session 2/2009, which was probably caused by RFI in the 18cm experiments.

We should pay attention to the BBCs with low (<0.8x) correlation amplitude in the ftp-fringe tests.

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

Calibration Accuracy

Numbers here are the median absolute error in the antenna gain amplitude.

This number will be approx half the error in the SEFD and is the same that you see in AIPS gain plots. The number in brackets after each entry is the number of experiments that were used to determine the median error for that entry.

On & Nt: Calibration was improved at 6 cm.

Jb & Cm: keep the status for at least 6 sessions.

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

Session 3/2008 Session 1-2/2008, & 3/2007

Station 6cm 18cm 6GHzCm 0.48(7) 0.13(6)Ef 0.06(8) 0.05(11) 0.04(6)Hh 0.17(6) 0.07(6) 0.04(2)Jb 0.13(8) 0.10(11) 0.06(6)Mc 0.07(10) 0.09(12) 0.06(6)Nt 0.09(10) 0.08(8) 0.04(6)On 0.11(8) 0.06(12) 0.07(6)Sh 0.07(2) 0.08(4)Tr 0.23(9) 0.09(11) 0.15(2)Ur 0.08(5) 0.08(7)Wb 0.05(10) 0.07(12) 0.10(6)Ar 0.08(2)

One years ago

TOG Meeting – Bonn, December 4, 2009 Jun Yang, JIVE

ANTABFS script

New feature Create antabfs files from the FS log file of MK5B station (e.g. Ys).

Further development Support 80 Hz radiometry.

Suggestions?