HOLOGRAPHY

                  OBS\HOLOGRAPHY dAz dEl Length Speed Direction /ANTENNA [A1
    ... An]

         Start an holography measurement for  antennas A1 .. An.   Normally,
    only  one  antenna should be specified, but the command can also be used
    to initiate a drift to measure e.g. an  azimut  encoder.   This  command
    makes a drift in interferometric mode, centered around the specified dAz
    and dEl horizontal offsets.  Direction can be  +AZ,  -AZ,  +EL  or  -EL.
    Length  and  Speed  are  in  "  and "/sec respectively.  For example the
    following procedure could be used to make a complete 32x32 beam map :
        DEFINE INTEGER BEAM
        LET BEAM 56
        SET ANGLE SEC
        SET SUB 4
        OFFSET 0 0/HORIZON
        CALIBRATE
        START
        FOR I -16 TO 15 BY 1
            IF (MOD(I,2).EQ.0) THEN
                HOLOGRAPHY BEAM|2     I*BEAM|2 16*BEAM BEAM|8 +AZ/AN 1
            ELSE
                HOLOGRAPHY BEAM|2 (I+1)*BEAM|2 16*BEAM BEAM|8 -AZ/AN 1
            ENDIF
            OFFSET 0 0/HORIZON
            CALIBRATE
            START
        NEXT