POTB Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Ray Baxter
     Date Prepared            : 11-Aug-1999
     Report Type              : Update
     Prepared Using           : GNU Emacs


1.   Site Identification of the GPS Monument

     Site Name                : Potrero Hills
     Four Character ID        : POTB
     Monument Inscription     : None
     IERS DOMES Number        : None
     CDP Number               : None
     Date Installed           : 10-Dec-1998 21:09 UT
     Geologic Characteristic  : BEDROCK
       Bedrock Type           : SEDIMENTARY
       Bedrock Condition      : WEATHERED
       Fracture Spacing       : 50-200 cm
       Notes                  : Threaded 5/8" rod cemented about 0.5 m deep 
                                into massive concrete missile bunker.
                                The reference is a virtual point in the 
                                center of the rod in the plane of the top of
                                a washer expoxied between two nuts.
     Additional Information   : Bay Area Regional Deformation Array


2.   Site Location Information

     City or Town             : Rural, near Fairfield
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : Pacific-North America plate boundary
     Approximate Position
       X coordinate (m)       : -2654637.8128  
       Y coordinate (m)       : -4258988.9341   
       Z coordinate (m)       :  3923161.0270
       Latitude (deg)         :  38.2026 N
       Longitude (deg)        : 121.9354 W
       Elevation (m)          :  29.6260
     Additional Information   : None


3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3
     Serial Number            : 02274
     Firmware Version         : 1F60
     Date Installed           : 10-Dec-1998 21:09 UT
     Date Removed             : 03-Aug-1999 19:58 UT
     Additional Information   : None

3.2  Receiver Type            : ASHTECH Z-XII3
     Serial Number            : 02274
     Firmware Version         : CC00
     Date Installed           : 03-Aug-1999 20:10 UT
     Date Removed             : 
     Additional Information   : None


4.   GPS Antenna Information

4.1  Antenna Type             : ASH700936C_M    NONE
     Serial Number            : 12377
     Antenna Height (m)       : 0.0409
     Antenna Reference Point  : BPA
     Degree Offset from North : 0
     Antenna Radome Type      : None
     Date Installed           : 10-Dec-1998 21:09 UT
     Date Removed             : 03-Aug-1999 19:58 UT
     Additional Information   : None

4.2  Antenna Type             : ASH700936C_M    SCIS
     Serial Number            : 12377
     Antenna Height (m)       : 0.0409
     Antenna Reference Point  : BPA
     Degree Offset from North : 0
     Antenna Radome Type      : SCIGN short Radome (00410)
     Date Installed           : 03-Aug-1999 20:10 UT
     Date Removed             : 
     Additional Information   : None


5.   Local Site Ties - None to date

6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              : 
       Effective Dates        : 
       Notes                  : None

7.   Collocation Information - None

8.   Meteorological Instrumentation - None

9.   On-Site, Point of Contact Agency Information

     Agency                   : Berkeley Seismological Laboratory
     Mailing Address          : University of California
                                Berkeley CA 94720-4760
     Primary Contact
       Contact Name           : Ray Baxter
       Telephone (primary)    : 510.642.3977
       Telephone (secondary)  : 510.643.3898
       Fax                    : 510.643.5811
       E-mail                 : bard@seismo.berkeley.edu
     Secondary Contact
       Contact Name           : Doug Neuhauser
       Telephone (primary)    : 510.642.3977
       Telephone (secondary)  : 510.642.0931
       Fax                    : 510.643.5811
       E-mail                 : bard@seismo.berkley.edu
     Additional Information   : None


10.  Responsible Agency (if different from 9.)

     Agency                   : Same as above

11.  More Information

     URL for More Information : http://www.quake.geo.berkeley.edu/bard
     Hardcopy on File
       Site Map               : No
       Site Diagram           : No
       Horizon Mask           : No
       Monument Description   : No
       Site Pictures          : No
     Additional Information   : No

     Antenna Graphics with Dimensions

            Ashtech w/Dorne-Margolin Choke Ring 

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

<--                      0.381                       -->

     NOTE: Dimensions and Offsets Presumed to be same
           as for TurboRogue DM-T (tests pending)

   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