VLBI Schedule Cover Letter


                              Stations: Bo,On,Mh,PV,Ha,Qu,KP,Ov,Sest


      Code: 3MM94A              Title:Global 3mm VLBI campaign, Dec.94, part A


      P.I.: T.P. Krichbaum

      e-mail: p459kri@mpifr-bonn.mpg.de

      Telephone:49-228-525-295 before observations, telescope: 49-2257-301-15

      UT Time and Date(s) of Observations:

       Dec.2 (336), 14h00 UT - Dec.5 (339), 11h00 UT 
       Ovro: Dec.3 (337), 12h45 UT - Dec.,5 (339), 00h50 UT


      Receiver setup: Frequency _86 GHz_   Standard ___  Non-standard _X_

                      If non-standard, record  _86188.99__  to _86300.99__  MHz with
                      _112_ MHz converted to DC; Polarization _LCP__

      !!!!!!          KittPeak/Ovro: 86212.99 -> 86268.99, 56 MHz (use 7 odd VC's) 

      Recording system: _MK3, mode A, double speed, (KittPeak, Ovro: mode B, double speed) 

      Schedule is available in machine readable form:

                       _X___ on aspen.aoc.nrao.edu _in directory DEC94_
                       _X___ on astbo1 _in directory_ DEC94_
                       _____ on tape, shipped on ___________________ (date)
                       _____ on floppy, shipped on _________________ (date)
                       _X__ other: will be sent via E-mail

      Ship tapes to:
                       _____ VLBA processor at AOC
                       __X__ Bonn processor
                       _____ Haystack processor
                       _____ Caltech processor


 Send logs to : T.P. Krichbaum  
 Max-Planck-Institut fuer Radioastronomie
 Auf dem Huegel 69
 D-53121 Bonn 
 Germany 

      INTERNET: p459kri@mpifr-bonn.mpg.de 

!!!!!!!!!!!!!!!!!!!!!!!!!!
 IMPORTANT: PLEASE CHECK your Video Converter setting since the values for your total LO
 as given in the $CODES section may be incorrect.
!!!!!!!!!!!!!!!!!!!!!!!!!!

 CALIBRATION: Tsys should be measured before and after each VLBI scan (within POSTOB AND PREOB)
 If this is not possible for you, please do regular Tsys measurements preferably BEFORE VLBI scans.

 If possible, please provide ANTENNA TEMPERATURE measurements and atmospheric OPACITY measurements

 Please send us an elevation dependent antenna GAIN CURVE and a value for its peak (e.g. in K/Jy).


!!!!!!!!!!!!!!!!!!!!!!!!!!
 PHASECAL: For all VLBI scans except for the SgrA* observations the PHASECAL should be switched ON.
 To allow for special spectral line calibration on SGRA, you need to switch the Phasecal OFF
 (repeat off) during all VXSGR/SGRA scans. Please DO NOT FORGET to switch PHASECAL ON after 
 VXSGR/SGRA observations are done ! Sorry that can not be automatized and needs your assistance.
!!!!!!!!!!!!!!!!!!!!!!!!!!