Subject: CB801 correlator report
From: Brian Corey <[email-masked]>
To: [email-masked] (IVS Mail)
Cc: [email-masked]
Date: Fri, 19 May 2000 18:05:34 EDT

CB801             #2834 tar-save has been created
2000 Jan 12-13    Processing factor = ??
DOY 012-013       95% have fourfit Quality Codes of 5-9.

Kokee:      Manual phase cal.

Ny Alesund: Phase cal phases were much more stable than in CB406
               a month earlier.
   
Urumqi:     Extremely weak phase cal at both S and X -- fringed with
              manual phases.
            Fringes in S channel 4 disappeared during scan 013-0222 due
              to problems with VC12 and did not return.  Channel 4 was
              deleted in fringing after 013-0222.
            The formatter clock jumped by about 0.2 us around 013-0230,
              and then returned to near its original value around
              013-0600.

Yebes:      First of two data tapes was lost in shipping, so only scans
              from 013-0527 on were correlated.
            No fringes or phase cal in S channel 3 before 013-1224.
              Fringed S-band without channel 3 up to 013-1224, with all
              6 channels after then.
            Scans between 013-1050 and 013-1132 lost due to antenna
              problem.

   QC=5-9
KC   99%    C - Seshan
KN   99%    K - Kokee Park
KU   97%    N - NRAO20
NO   96%    O - Ny Alesund
SN   97%    S - Noto
SY   92%    U - Urumqi
            Y - Yebes
-----------------------------------------------------------------------------

CB801 (2000 January 12-13)
==========================

Correlator notes:

Manual phase cal for Kokee and Urumqi, normal phase cal for others.

Urumqi: Weak phase cal, with unstable phases, in all channels.
Fringes in S channel 4 disappear during scan 013-0222.  Fringe S-band
data before then with all 6 channels, after then with 5.

Yebes: First of 2 tapes never arrived at Haystack.
Fringes in S channel 3 are missing at the start of the second tape,
but come in at 013-1224.  Fringe S-band data with 5 channels before
then, 6 after then.

Because of the S-band comings and goings and the inability to specify
time ranges within mk4fit control files (as of April 25), must use
three different control files to fringe the full set of data.

Production pass fringed on doy 118.
Cleanup pass fringed on doy 129.
One E code fixed on doy 130.
Refringed all scans with mismatched FRTs on doy 140.

Used the following fourfit control files:
                                                time range
  /correlator/data/2834/cf_2834_part1    012-1830 through 013-0229 
  /correlator/data/2834/cf_2834_part2    013-0230 through 013-1221
  /correlator/data/2834/cf_2834_part3    013-1224 through 013-1827 

Created type-2 export list by
1) deleting data with channel 1 pcal amp < .01 for stations fringed
  with normal phase cal;
2) selecting data with best QC fringed before doy 140;
3) selecting data with best QC fringed on doy 140;
4) merging data sets 2 and 3, and eliminating any duplicates by
  selecting the data with the later procdate.

Ny Alesund:  With the exception of scan 013-0034, Ny Alesund's phase
cal phase was stable (unlike the case in CB406), as indicated by
X-band pcal amplitudes that were constant to 10-15% pk-pk.

Yebes:  X-band pcal phase varies by 10-20 deg quasi-sinusoidally on
1-minute time scales. In scan 013-1344, X pcal phase changed by ~180 deg
in 1 minute, which is by far the largest variation at Yebes in the whole
experiment.

****************************************************************************

Station Mail:

****************************************************************************

From: [email-masked] (Kokee Park Geophysical Observatory)
To: [email-masked]
Subject: CB801 start at Kokee

Kokee started Core-B801 normally.

First source was 1044+719 at 012/1830z

Formatter minus GPS= 0.0 usec at 012/1823z  

Tape head humidity was 31% at start.

First parity check was good.

System checks are as follows:
                                          
SEFD          SOURCE      AZ/EL     WEATHER        OFFSET
826/748        cygnus-a  54/24     partly cloudy  0.017/0.000

Since the last Core-B support, the following changes have been
made in the equipment:
     Power supplies were swapped between the az encoder and CCU.
     4 dB of attenuation was removed from the S-band RHC input at
the optics box in the receiver.
     The met sensor was changed.  Temp readings are now more
stable.  Humidity readings are still invalid.

From: Ny-Aalesund <[email-masked]>
Subject: CB801 started at Ny Alesund
To: [email-masked]
Date: Wed, 12 Jan 2000 20:03:28 MET
 
Hi folks,
CB801 has started at Ny Alesund, the first source was 1044+719
Weather at the start of the experiment was overcast.
 
At the start of the experiment the timing was:

Maser after fts8400 by 7.93 usec
Maser after Tac by 7.59 usec
Maser ahead of formatter by 139.5 nsec
Tac ahead of formatter by 7.76 usec

Pointing data.
Source       AZ/EL          AZ/EL offset          SEFD X/S
Taurus-a   129/29.3         0.0017/-0.0023    810+-2/1389+-9.5
Cygnus-a   284/38.9        -0.0017/0.00011    775+-3.3/1390+-58

Zenith tsys X band (IF1)/(IF3) 53/55   S band (IF2) 44

Best regards,
David, Ny Alesund VLBI team.
--
Ny-Alesund Geodetiske Observatorium	Ny-Alesund Geodetic Observatory
Statens kartverk			Norwegian Mapping Authority
Boks 13					Box 13
N-9173 Ny-Alesund, Svalbard		N-9173 Ny-Alesund, Svalbard
NORWAY					NORWAY

Tlf:  7902 7010				Phone: +47 7902 7010
Faks: 7902 7148				Fax:   +47 7902 7148

From [email-masked] Thu Jan 13 13:00:40 EST 2000
From: GB Interferometer Operations <[email-masked]>
To: [email-masked]
Subject: CB801-end

CB801

All sources were not observed for CB801.  We broke out of CB801 to do the
intensive I00013 at 1640 UT.  We will not return to CB801.

Tape SVLB0188,86F1 will be shipped Friday January 14, 2000 via FEDEX to
Haystack.

  **** We have 6 small thin tapes and 12 large thin tapes. ****
  **** We have 6 medium thin tape for weekends. ****

Maser ahead of TAC by 281 nanosec.
TAC ahead of Formatter by 255 nanosec.
 
GB OPS

Date: Thu, 13 Jan 2000 19:21:13 +0100
From: Francisco Colomer <[email-masked]>
Organization: Observatorio Astronomico Nacional
To: [email-masked]
Subject: cb801 at Yebes

OAN-Yebes participated in CB801 without major trouble.
Tapes sent to Haystack. Log at CDDISA tomorrow.

    Paco Colomer
    VLBI Coordinator

From [email-masked] Thu Jan 13 14:36:46 EST 2000
From: [email-masked] (Kokee Park Geophysical Observatory)
To: [email-masked]
Subject: CB801 finish at Kokee

Kokee completed Core-B801 on schedule.

Weather was cloudy and overcast during the day and clear at night.

Formatter minus GPS =  0.0 usec at 013/1820z                

The following tape will go out 13 Jan,  Fedex AWB#812090323209 :
     OVLB0020

Tape head humidity at completion:  29%         

Tapes remaining:    17

Experiment went well; parity errors good.

From [email-masked] Thu Jan 13 15:07:04 EST 2000
From: Ny-Aalesund <[email-masked]>
Subject: CB801 ended in Ny-Alesund
To: [email-masked]
Date: Thu, 13 Jan 2000 21:03:18 MET

CB801 ended in Ny-Alesund

Weather conditions: At the end of the experiment the sky was mostly clear. 

Notes:
The command: setcl offset was run at 06:02:15.

At the end of the experiment the timing was:
Maser after GPS (FTS8400) by 7.820 usecs.
Maser after TAC by 7.53 usecs.
Maser before formatter by 139 ns.
TAC before Formatter by 7.67 usecs.

Pointing:
Source      Az/El   Az-/El-offsets   SEFD x-band/s-band
Taurusa     139/31  0.002/0.002      802+-2/1422+-28
Cygnusa     297/36  -0.002/-0.003    762+-15/1322+-29
Casa        259/63  -0.002/-0.003    837+-21/1225+-39

Zenith tsys 
IF1/IF3   54/57 
IF2       37

Best regards,
Helge,
Ny-Alesund Vlbi-team.

Ny-Alesund Geodetiske Observatorium	Ny-Alesund Geodetic Observatory
Statens kartverk			Norwegian Mapping Authority
Boks 13					Box 13
N-9173 Ny-Alesund, Svalbard		N-9173 Ny-Alesund, Svalbard
NORWAY					NORWAY

Tlf:  7902 7010				Phone: +47 7902 7010
Faks: 7902 7148				Fax:   +47 7902 7148

From: Gino Tuccari <[email-masked]>
Date: Thu, 13 Jan 2000 21:00:44 +0100 (MET)
To: [email-masked]
Subject: cb801 in Noto

Noto station completed CB801. During the experiment weather
has been pretty bad. Strong interferences in S band.

G. Tuccari

To: [email-masked]
Cc: [email-masked], [email-masked]
Subject: problems to upload log file 
Date: Tue, 18 Jan 100 14:54:31 +0100

We have problems to upload the log file for experiment CB801
at Yebes (cb801yb.log) at the cddisa computer; the "vlbigeo"
account we always use is not allowed conection.

Please give instructions.

	VLBI team at Yebes

-------------------------------------
| Observatorio Astronomico Nacional |
| Apartado 1143                     |
| E-28800 Alcala de Henares         |
| Spain                             |
| Phone: +34-91-885-5060 and 61     |
| Fax:   +34-91-885-5062            |
| OAN VLBI account: [email-masked]     |
| WWW: http://www.oan.es/           |
-------------------------------------