n21dk01

Version as of 22:01, 3 Nov 2024

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n21dk01 Correlation Report

what	date
Effelsberg transfer Epochs G and H complete, remainder postponed due EVN Session 2 VLBI (27 May-17 Jun)	20.05.2021
Yebes transfer Epochs G, H, I, J, E complete	11.06.2021
Effelsberg transfer Epochs I, J, E, K, L completed	23.06.2021
Fringes Ef-Ys K-band and Ef-Ys Q-band, epoch G	10.06.2021
KVN started data transfer	16.06.2021
KVN ongoing transfers... 16.08.2021 still transferring...	(not complete)
Epoch G full correlation K+Q v1 finished	15.08.2021
Epoch I full correlation K+Q running...	16.08.2021
Released (difxexport) version 1 of epoch G and epoch I.	17.08.2021

Data transfer status

Ep	DOY	Ef 2021	Ys	Kt	Ku	Ky
G	124	20.5. ok	8.6. ok	22.7. ok	10.7. ok	1.7.
H	127	19.5. ok	29.5. ok	25.7. ok	-not started-	23.7.
I	141	20.6. ok	5.6. ok	5.8. ok	4.8. ok	3.8.
J	141	21.6. ok	8.6. ok	-not started-	-not started-	ongoing (13.8.)
E	142	20.6. ok	11.6. ok	1.8. ok	29.7. ok	28.7.
K	143	23.6. ok	(not observed)	-not started-	-not started-	-not started-
L	143	23.6. ok	(not observed)	-not started-	-not started-	-not started-

Ep	DOY	Production Correlation	Diagnostics	Notes
G	124	15.8.2021, version 1	Residuals pdf, ...	Ulsan high residual rate (~20 mHz); no H-maser rate info
H	127
I	1411	16.8.2021, version 1	Residuals pdf, ...	Ulsan high residual rate (~20 mHz); no H-maser rate info
J	141
E	142
K	143
L	143

J. Gonzales: rate 1.17e-13 s/s, offsets in logs named n1k01?ys.log on vlbeer.
Did not observe K and L due to heavy rain and broken shutter.
Transferred the data of G, H, I, J, E.
VEX freq block sidebands UUUU UUUU LLLL LLLL rather than the default UL UL ... from SCHED
Epoch E: scan No0003 (142-0814) file empty or not recorded

U. Bach, etransferred epochs G & H. Pending transfer of the remaining epochs.
Offset +19.3 usec in G
Logs named ndk01g, ndk01h, and later n1k01i, n1k01j, n1k01k, n1k01l, n1k01e on vlbeer.
H-maser rate same as in GMVA f211a, i.e., 2.05e-13 s/s.
VEX freq block sidebands UUUU LLLL rather than the default UL UL ... from SCHED.
Epoch G: wind and bad weather, first part ot track unusable, not on source until ~18:30 UT

Special setup for correlation, because Effelsberg does not have simultaneous K and Q capability.

Initial attempt using v2d "freqIds=..." and a K-band and a separate Q-band v2d file was only partially successful. Issue: any change in array composition (e.g., telescope recorded data in one scan, in another one not) jumbles the DiFX .input FREQ table frequency IDs and the nominally K-band freqIds list refers to some Q-band recorded channels as well.
Production approach uses VEX file where Ef has been made dual K&Q, a v2d file with two Datastreams for Ef (one K, one Q), and a bit of scripting to separate the Ef filelist into two lists one with K-band and the other with Q-band VDIF files
Zoom bands of 64 MHz added into to KVN 2ch x 512 MHz to match Ef Ys 64 MHz wide channels in USB/LSB
Zoom bands added also to Ef Ys 64 MHz LSB channels in order to flip these into USB and produce all-USB visibility data; avoids HOPS fourfit issues with mixed USB-LSB visibilities