Onsala:  Onsala has swapped polarisation
         Should run task SWPOL to swap polarisation before fringe fitting in AIPS.

         Fringes suddenly dissappear after day 142, 14h45 UT both in MK5B and VDIFF
         recording, Tsys are high, problem unidentified. Probably due to failure
         in receiver. Prior to start of GMVA run, phase-stability was an issue.
         Looks as if all data are lost during 142-14h45 -> 144-02h00

Yebes:  has recorded one polarisation (LCP) and writes this signal also to RCP 
        (the user must flag the 'wrong' polarisation; run UVFLG on RCP)

PdB:    no data due to broken 1pps cable

Due to a software problem of the DBBC2 the following stations have a V-shape in
their amplitudes which reduces the SNR: 

Effelsberg, Pico, Yebes, Metsahovi

The user will need to make a manual bandpass correction for these stations 
(adjustment of Tsys vs. IF) and/or some flagging.

Pico:  RR is about 2-3 times higher than LL, it is possible that LL is more
       affected by the DBBC2 problem than RR