CRO1 Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : David A. Stowers
     Date Prepared            : 30-SEP-1999
     Report Type              : UPDATE
     Prepared Using           : vi


1.   Site Identification of the GPS Monument

     Site Name                : St. Croix VLBA
     Four Character ID        : CRO1
     Monument Inscription     : St. Croix VLBA RM 1
     IERS DOMES Number        : 43201M001
     CDP Number               : JPL 4023
     Date Installed           : 16-JAN-1994 hh:mm UT
     Geologic Characteristic  : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc)
       Bedrock Type           : (IGNEOUS/METAMORPHIC/SEDIMENTARY)
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/10-50 cm/50-200 cm/over 200 cm)
       Notes                  : (multiple lines)
     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 Information

     City or Town             : Christiansted
     State or Province        :
     Country                  : U.S. Virgin Islands (USA)
     Tectonic Plate           : Caribbean
     Approximate Position
       X coordinate (m)       : 2607771.2130
       Y coordinate (m)       : -5488076.8781
       Z coordinate (m)       : 1932767.6877
       Latitude (deg)         : 17.7568
       Longitude (deg)        : -64.5843
       Elevation (m)          : -31.8280
     Additional Information   : The site is located at the NRAO VLBA facility
                              : on the northeast tip of St. Croix.


3.   GPS Receiver Information

3.1  Receiver Type            : ROGUE SNR-8000
     Serial Number            : T133
     Firmware Version         : 2.8
     Date Installed           : 16-JAN-1994 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

3.2  Receiver Type            : ROGUE SNR-8000
     Serial Number            : T356
     Firmware Version         : 3.2 link 03/09/95
     Date Installed           : 13-OCT-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

3.3  Receiver Type            : AOA SNR-8100 ACT
     Serial Number            : R141
     Firmware Version         : 3.3.32.2
     Date Installed           : 30-SEP-1999 17:00 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

3.x  Receiver Type            :
     Serial Number            :
     Firmware Version         :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


4.   GPS Antenna Information

4.1  Antenna Type             : AOAD/M_T
     Serial Number            : 133
     Antenna Height (m)       : 0.0614
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 16-JAN-1994 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

4.2  Antenna Type             : AOAD/M_T
     Serial Number            : 484
     Antenna Height (m)       : 0.0814
     Antenna Reference Point  : BPA
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 13-OCT-1995 hh:mm UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

4.x  Antenna Type             :
     Serial Number            :
     Antenna Height (m)       : (m)
     Antenna Reference Point  : (ARP/BCR/BPA)
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


5.   Local Site Ties

5.x  Monument Name            :
     Site Ref CDP Number      : (XXXX)
     Site Ref Domes Number    : (XXXXXXXXX)
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Date Measured            : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              :
       Effective Dates        : 13-OCT-1995 - dd-MMM-yyyy)
       Notes                  : (multiple lines)

6.x  Standard Type            : (H-MASER/CESIUM/QUARTZ/INTERNAL/RUBIDIUM)
       Frequency              :
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


7.   Collocation Information

7.1  Instrumentation Type     : VLBI
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

7.x  Instrumentation Type     : (DORIS/GLONASS/PRARE/SLR/VLBI)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)


8.   Meteorological Instrumentation

8.1  Humidity Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (% rel h)     : (% rel h)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.2  Pressure Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (mbar)        : (mbar)
       Height Diff to GPS (m) : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.3  Temperature Sensor Model :
       Manufacturer           :
       Data Frequency         :
       Accuracy (deg C)       : (deg C)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.4  Water Vapor Radiometer   :
       Manufacturer           :
       Distance to GPS (m)    : (m)
       Elev Diff to GPS (m)   : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.5  Other Instrumentation    : (multiple lines)


9.   On-Site, Point of Contact Agency Information

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


10.  Responsible Agency (if different from 9.)

     Agency                   : JPL
     Mailing Address          : 4800 Oak Grove Drive
                              : Pasadena, CA  91109  USA
     Primary Contact
       Contact Name           : David A. Stowers
       Telephone (primary)    : 818-354-7055
       Telephone (secondary)  :
       Fax                    : 818-393-4965
       E-mail                 : dstowers@jpl.nasa.gov
     Secondary Contact
       Contact Name           : Network Engineer/UNAVCO
       Telephone (primary)    : 303-497-8000
       Telephone (secondary)  :
       Fax                    : 303-497-8028
       E-mail                 : ruud or kfeaux @unavco.ucar.edu
     Additional Information   : Oivind Ruud (x8030) or Karl Feaux (x8037)


11.  More Information

     URL for More Information :
     Hardcopy on File
       Site Map               : x
       Site Diagram           : x
       Horizon Mask           : x
       Monument Description   : x
       Site Pictures          : x
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions


TURBOROGUE: AOAD/M_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