DHLG Site Information Form
     International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Jeff Behr
     Date Prepared            : 04-FEB-1997
     Report Type              : UPDATE
     Prepared Using           :


1.   Site Identification of the GPS Monument

     Site Name                : Durmid Hill PGGA
     Four Character ID        : DHLG
     Monument Inscription     : None
     IERS DOMES Number        : (XXXXXXXXX)
     CDP Number               : Not yet available
     Date Installed           : 24-APR-1996 02:50 UT
     Geologic Characteristic  : SEDIMENTARY ROCK
       Bedrock Type           : SANDSTONE/MUDSTONE
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/10-50 cm/50-200 cm/over 200 cm)
       Notes                  : (multiple lines)
     Additional Information   : Monument type - Driven Rod Quincunx
                              : Stainless steel 3/4" rods driven to refusal (at
                              : ~24'depth) and welded together approximately
                              : 1.5 m above ground surface. The station mark is
                              : a hole drilled into the side of the vertical
                              : stainless steel rod, between the rod weld point
                              : and the antenna adaptor.
                              : Station is colocated with the south end vault
                              : of the Durmid Hill Laser strainmeter operated
                              : by Frank Wyatt and Duncan Agnew, IGPP, SIO.
                              : Information on the Quincunx monument and the
                              : Durmid Hill strainmeter are located on the
                              : web at http://www-pfo.ucsd.edu


2.   Site Location Information

     City or Town             : Durmid Hill
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : North American/Pacific Plate Boundary
     Approximate Position
       X coordinate (m)       : -2319120.7869
       Y coordinate (m)       : -4799881.2570
       Z coordinate (m)       :  3490071.5368
       Latitude (deg)         :  33.2129 N
       Longitude (deg)        : 115.7881 W
       Elevation (m)          : 6371638.7717
     Additional Information   : Coordinates taken from Rinex file header,
                              : converted to WGS84


3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH LP Z-XII 700845-10D
     Serial Number            : LP 01378
     Firmware Version         : 1E86-1D01
     Date Installed           : 24-APR-1996 02:50 UT
     Date Removed             : 23-JAN-1997 05:00 UT
     Additional Information   : (multiple lines)

3.2  Receiver Type            : ASHTECH LP Z-XII 700845-10D
     Serial Number            : LP 01389
     Firmware Version         : 1E95-1D01
     Date Installed           : 23-JAN-1997 05:10 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Firmware upgrade, receiver swap

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             : ASHTECH Choke Ring 700936
     Serial Number            : 12656
     Antenna Height (m)       : 0.1214
     Antenna Reference Point  : ARP
     Degree Offset from North : Antenna Alligned to True N
     Antenna Radome Type      : ASHTECH Choke Ring Radome
     Date Installed           : 24-APR-1996 02:50 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        : 24-APR-1996 - 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.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                   : SOPAC, Scripps Institution of Oceanography
     Mailing Address          : IGPP, MS 0225
                              : UC, San Diego
                              : 9500 Gilman Drive
                              : La Jolla, CA 92093
     Primary Contact
       Contact Name           : Jeff Behr
       Telephone (primary)    : 619-534-8487
       Telephone (secondary)  : 619-534-7692
       Fax                    : 619-534-9873
       E-mail                 : behr@pgga.ucsd.edu
     Secondary Contact
       Contact Name           : Frank Wyatt/Duncan Agnew
       Telephone (primary)    : 619-534-2411
       Telephone (secondary)  : 619-534-0229
       Fax                    : 619-534-9873
       E-mail                 : wyatt@ramsden.ucsd.edu
     Additional Information   : (multiple lines)


10.  Responsible Agency (if different from 9.)

     Agency                   : (multiple lines)
     Mailing Address          : (multiple lines)
     Primary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)


11.  More Information

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


     ASHTECH w/DORNE MARGOLIN Choke Ring (& Radome)

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