Message-ID: <45744D6E.5000309@nrao.edu>
Date: Mon, 04 Dec 2006 11:31:42 -0500
From: Frank Ghigo <fghigo@nrao.edu>
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To: mbieten@yorku.ca
CC: bartel@yorku.ca, mrupen@nrao.edu, Walter Brisken
 <wbrisken@nrao.edu>,
        VLB operators <vlbaops@aoc.nrao.edu>,
        "analysts@aoc.nrao.edu"
 <analysts@aoc.nrao.edu>,
        GBT operations <gbtops@gb.nrao.edu>,
        gbtobssum
 <gbtobssum@donar.cv.nrao.edu>
Subject: project BB228 at Green Bank
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The VLBI project BB228A was observed with the GBT
at 8.4 GHz.   There were some difficulties starting up.
The clock on the VLBA station computer jumped forward
by 4 minutes for no apparent reason.  The operator set the
clock to the correct time at 19:42 UT.  This means there
will be an ambiguous time range in the data from
the start of the run to about 19:46.  Hence probably best
not to use any data prior to about 19:46.

There was also a problem getting good power levels into
VLBA_DAR input D.  This was apparently due to some
problem with either optical driver 6 or optical receiver 6.
The operator put OD6 into the bad devices file,
and when we patched around it and used OD5 instead,
the power levels were good.
So all data should be good after about 19:52 UT.

Tsys was about 36-40K;   phase cals were 1.5-2%.
Weather was cloudy and cold.

Disk packs NRAO-165 and HART-024 are being
shipped to Socorro today.
Note that NRAO-165 has projects BB209C and
the first part of BB228A.  HART-024 has the
remainder of BB228A.

-- frank