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     SITE INFORMATION FORM
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0. Form

        Prepared by (full name): Keith F. Stark
        Date                   : 31-Oct-1995
        Report type            : Update
          (NEW or UPDATE)

1. Site Identification of the GPS monument

        Site Name              : St. Croix VLBA
        4 char ID              : CRO1
        Monument Inscription   : St. Croix VLBA RM 1
        IERS DOMES Number      : 43201M001 (Liu, 22 May 96)
        CDP Number             : JPL 4023
        Date                   : 1994
        Additional information : The monument is a 0.457m diameter stainless
                                 steel plate set in a 0.762m diameter concrete
                                 monolith that projects 0.635m above grade. The
                                 monument is located approximately 82m
                                 northwest of the 25m VLBA antenna.


2. Site Location

        City                   : Christiansted
        Country                : United States Virgin Islands (USA)
        Tectonic Plate         : Caribbean
        Additional information : The site is located at the NRAO VLBA facility
                                 on the northeast tip of St. Croix.


3. GPS Receiver

A)      Type                   : TurboRogue SNR-8000
        Serial Number          : T-133
        Firmware Version       : 2.8
        Date                   : 16-Jan-1994

B)      Type                   : TurboRogue SNR-8000
        Serial Number          : T356
        Firmware Version       : 3.2 link 03/09/95
        Date                   : 13-Oct-1995


4. GPS Antenna

A)      Type                   : Dorn-Margolin T
        Serial Number          : 133
        Date                   : 16-Jan-1994

        Vertical Antenna Height: 6.14 cm
        Antenna Reference Point: bottom of pre-amp
        Date                   : 16-Jan-1994

B)      Type                   : Dorn-Margolin T
        Serial Number          : 484
        Date                   : 13-Oct-1995

        Vertical Antenna Height: ?.?? cm (probably 6.14cm)
        Antenna Reference Point: bottom of pre-amp
        Date                   : 13-Oct-1995


5. Local Site Ties

Monument        CDP    DOMES              Components      Accuracy Date
Name          Number  Number       dX       dY      dZ     mm yy-mm-dd
............  ....... ........   ........ ........ ........ .. .. .. ..
............  ....... ........   ........ ........ ........ .. .. .. ..
............  ....... ........   ........ ........ ........ .. .. .. ..

Differential coordinates from the GPS monument to the reference and
other monuments. The components are parallel to the XYZ-axes of the
global geocentric reference system ITRF (WGS-84).

Site ties currently not available.

"Accuracy" is estimated accuracy of local survey (millimeters).


6. Frequency standard

        H-maser /   /   Cesium /   /    Quartz /   /     Internal / x /
        Other (specify)        :
        Date                   : 13-Oct-1995

        (Mark with 'X')


7. Collocation

        SLR    /   /    VLBI  /x /     DORIS  /  /     PRARE    /  /


        Other GEOPHYSICAL Instrumentation (specify)        :

        Other (specify)        :

        (Mark with 'P' for permanent, 'M' for mobile collocation)


8. On-site, Point of Contact Agency Information

        Agency                 : National Radio Astronomy Observatory (NRAO)
        Contact                : John Williams/Ronald Lindsey
        Address                : NRAO St. Croix VLBA Station
                                 P.O. Box 24878
                                 Gallows Bay Station, Christiansted
                                 St. Croix, USVI  00824-0878
        Telephone              : (809) 773-4448
        E-mail                 : vlbasc@vlbacc.nrao.edu
        Fax                    :


9. Responsible Operations Agency
   (if different from item 8)

        Agency                 : JPL
        Contact                : Keith F. Stark
        Address                : 4800 Oak Grove Drive
                               : Pasadena, CA
        Telephone              : 818-354-5922
        E-mail                 : stark@logos.jpl.nasa.gov
        Fax                    : 818-393-4965


10. Please insert here the character graphics corresponding to the
antenna type.


             TurboRogue: DORNE MARGOLIN T

                         -----
                     /     +     \                        <-- 0.128  L2
                    |      +      |                       <-- 0.110  L1
  +--------------------------------------------------+    <-- 0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.038
+-------------------+-------------+--------------------+  <-- 0.035  BCR
                    |             |
                   =|             |
                    +------x------+                       <-- 0.000  ARP

<--                      0.381                       -->


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering


11. Hard copy information

    Please mark 'X' if on file or date expected to be available.

        Site Map               : x
        Site Diagram           : x
        Horizon Mask           : 1994
        Monument description   : x
        Site pictures          : x