n21dk01

Data Status

Production Correlation Status

Yebes

• 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.
• 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

Effelsberg

• 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

KVN Yonsei, Ulsan, Tamna

• Table of clock offsets, sign for VEX same as in table
• Table of most recently determined site positions
• H-maser rates not available, assuming 0 us/s for Yonsei and Tamna, same 0 us/s for Ulsan but high residual rate 20 mHz and used VEX Ku -0.8e-12 s/s
• Tie of KVN to Ef+Ys : shift KVN VEX clocks by -2.83 us from kvn a priori values

DiFX

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

• Modes 'kband' and 'qband' in Observed VEX are are dual band at KVN, single band at Ef: would end up with FITS with KVN+Ef KQ+K for mode 'kband', and FITS with KVN+Ef KQ+Q and mode 'qband', i.e., KVN KQ in both FITS files (data duplication).
• 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 an e.g nominally K-band -only list of freqIds refers to some Q-band recorded channels as well and misses some K-band recorded channels.
   
• 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

Effelsberg file list splitting by band, example for Epoch G:

vsum -s /data/n21dk01g/Ef/*.m5a > filelist.ef
rm -f filelist.ef.k filelist.ef.q
for scanNr in `vexpeek -s n21dk01g.vex.obs | grep kband | grep EF | cut -c 3-6`; do
    echo "grep kband 01g_ef_no$scanNr"
    grep "01g_ef_no$scanNr" filelist.ef >> filelist.ef.k
done
for scanNr in `vexpeek -s n21dk01g.vex.obs | grep qband | grep EF | cut -c 3-6`; do
    echo "grep qband 01g_ef_no$scanNr"
    grep "01g_ef_no$scanNr" filelist.ef >> filelist.ef.q
done