VBCA Site Information Form
     International GPS Service for Geodynamics

0.   Form

     Prepared by (full name)  : Mariano Muller
     Date Prepared            : 2006-09-25
     Report Type              : UPDATE
     If Update:
       Previous Site Log       : vbca_19990615.log
       Modified/Added Sections : 4.1, 9., 10. 

1.   Site Identification of the GPS Monument

     Site Name                : Bahia Blanca
     Four Character ID        : VBCA
     Monument Inscription     : INSTITUTO GEOGRAFICO MILITAR
     IERS DOMES Number        : 41512M001
     CDP Number               :
     Date Installed           : 06-DEC-1998
     Geologic Characteristic  :  
       Bedrock Type           : Structural granitic horst with azimuth
				110 degrees (E-W) at a depth of 1300m.
       Bedrock Condition      : This structural high is limited in the 
				South and North by 2000 m deep E-W
				oriented fractures.
       Fracture Spacing       : Lying over the bedrock a 700 m thick 
				paleozoic sediment layer is found. It is
				mainly composed by quartzite. Overlying
				this there are 600 m of tertiary 
				sediments which are almost horizontal.
				These are mainly composed by clay and 
				sandstone. The last 25 m up to the 
				surface are composed by sandy-calcareous
				and loessial quaternary sediments.
       Notes                  :
     Additional Information   : 

2.   Site Location Information

     City or Town             : Bahia Blanca
     State or Province        : Provincia de Buenos Aires
     Country                  : Argentina
     Tectonic Plate           : South America
     Approximate Position
       X coordinate (m)       : 2319240.7577
       Y coordinate (m)       :-4411743.8223
       Z coordinate (m)       :-3966484.1495
       Latitude (deg)         : 38.70 S
       Longitude (deg)        : 62.27 W
       Elevation (m)          : 59.43 m
     Additional Information   :

3.   GPS Receiver Information

3.1  Receiver Type            : LEICA SR9500
     Serial Number            : 10272
     Firmware Version         : 2.1
     Date Installed           : 06-DEC-1998 
     Date Removed             :
     Additional Information   :

3.x  Receiver Type            :
     Serial Number            :
     Firmware Version         :
     Date Installed           :
     Date Removed             :
     Additional Information   :

4.   GPS Antenna Information

4.1  Antenna Type             : LEIAT303
     Serial Number            : 2141
     Antenna Height (m)       : 1.0707m
     Antenna Reference Point  : BCR
     Degree Offset from North : 0
     Antenna Radome Type      : 
     Date Installed           : 06-DEC-1998
     Date Removed             :
     Additional Information   :

4.x  Antenna Type             :
     Serial Number            :
     Antenna Height (m)       :
     Antenna Reference Point  :
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           :
     Date Removed             :
     Additional Information   :

5.   Local Site Ties

5.1  Monument Name            : 
     Site Ref CDP Number      :
     Site Ref Domes Number    :
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 :   m
       dy (m)                 :   m
       dz (m)                 :   m
     Accuracy (mm)            :   
     Date Measured            : 
     Additional Information   :

5.2  Monument Name            : 
     Site Ref CDP Number      :
     Site Ref Domes Number    :
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 :  m
       dy (m)                 :  m
       dz (m)                 :  m
     Accuracy (mm)            :  
     Date Measured            : 
     Additional Information   :

5.x  Monument Name            : 
     Site Ref CDP Number      :
     Site Ref Domes Number    :
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : 
       dy (m)                 : 
       dz (m)                 : 
     Accuracy (mm)            : 
     Date Measured            : 
     Additional Information   :

6.   Frequency Standard

6.1  Standard Type            : 
       Frequency              :
       Effective Dates        :
       Notes                  :

6.x  Standard Type            :
       Frequency              :
       Effective Dates        :
       Notes                  :

7.   Collocation Information

7.1  Instrumentation Type     : 
       Status                 : 
       Effective Dates        : 
       Notes                  :

7.x  Instrumentation Type     : 
       Status                 : 
       Effective Dates        : 
       Notes                  :

8.   Meteorological Instrumentation

8.1  Humidity Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (% rel h)     :
       Effective Dates        :
       Notes                  :

8.2  Pressure Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (mbar)        :
       Height Diff to GPS (m) :
       Effective Dates        :
       Notes                  :

8.3  Temperature Sensor Model :
       Manufacturer           :
       Data Frequency         :
       Accuracy (deg C)       :
       Effective Dates        :
       Notes                  :

8.4  Water Vapor Radiometer   :
       Manufacturer           :
       Distance to GPS (m)    :
       Elev Diff to GPS (m)   :
       Effective Dates        :
       Notes                  :

8.5  Other Instrumentation    : 

9.   On-Site, Point of Contact Agency Information

     Agency                   : Universidad del Sur

     Mailing Address          : 

     Primary Contact Name     : Nilda C. Di Croche
       Telephone (primary)    : +54-0291-4525087
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Secondary Contact
       Contact Name           : Claudia Elizabet Bel
       Telephone (primary)    : +54-0291-4551802
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   :

10.  Responsible Agency (if different from 9.)

     Agency                   : Facultad de Ciencias Astronomicas y Geofisicas
     Mailing Address          : Observatorio La Plata, Paseo del Bosque S/N
                                c/o Universidad Nacional La Plata (UNLP)
				(1900) La Plata / Argentina
     Primary Contact
       Contact Name           : Marķa Paula Natali
       Telephone (primary)    : +54-0221-423-6593/94 int 154
       Telephone (secondary)  :
       Fax                    : 
       E-mail                 : paula@fcaglp.unlp.edu.ar
     Secondary Contact
       Contact Name           : Mariano Muller
       Telephone (primary)    : +54-0221-423-6593/94 int 154
       Telephone (secondary)  :
       Fax                    : 
       E-mail                 : mmuller@fcaglp.unlp.edu.ar
     Additional Information   : VBCA station was installed and mainteined in operation
                              : in cooperation with DGFI 

11.  More Information

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

     (insert text graphic)





                        ANTENNA DIMENSIONS
                        ------------------



          		 LEICA AT-303

                         -----
                     /     +     \                        <-- 0.0878m  L2
                    |      +      |                       <-- 0.0795m  L1
  +-----------------+-------------+------------------+
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+
+--------------------------x---------------------------+  <-- 1.0707m BCR=ARP





   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering
   TGP: Top of Ground Plane               BGP: Bottom of Ground Plane
   TPA: Top of Preamplifier               BPA: Bottom of Preamplifier
   TOP: Top of Pole