ACYA Site Information
     IGEF-UNAM Instituto de Geofisica. 
     Department of Seismology  

0.   Form

     Prepared by (full name)  : Jose Antonio Santiago Santiago
     Date Prepared            : 2023-01-04
     Report Type              : Correction to Antenna type (standard name)
     Prepared Using           : 


1.   Site Identification of the GPS Monument

     Site Name                : ACAPULCO CLUB DE YATES
     Four Character ID        : ACYA
     Monument Inscription     : 
     IERS DOMES Number        : Leica, no # 
     CDP Number               : (XXXX)               :
     Monument Description     : STEEL ROD
       Height of the Monument : (m)
       Monument Foundation    : ROOF
       Foundation Depth       : (m)
     Marker Description       : (CHISELLED CROSS/DIVOT/BRASS NAIL/etc)
     Date Installed           : 11-JAN-2004 01:00 UT
     Geologic Characteristic  : TIDE GAUGE CONCREET ROOF
      Bedrock Type            : Granitic boulders 
      Bedrock Condition       : 
      Fracture Spacing        : 
     Notes                    : 
     Additional Information   : IGEF-UNAM Instituto de Geofisica. 
                              : Department of Seismology  
                              : Monument is stainless steel rod
                              : Fixed antenna height is 2.935 m wrt benchmark #1214
                               
                             
2.   Site Location Information

     City or Town             : ACAPULCO
     State or Province        : Guerrero
     Country                  : Mexico
     Tectonic Plate           : NA
     Approximate Position     
       X coordinate (m)       : -1050181.3759 
       Y coordinate (m)       : -6015418.3398  
       Z coordinate (m)       :  1835676.1269
       Latitude (deg)         : 16° 50' 16.68873" N ( 16.837969)
       Longitude (deg)        : 99° 54' 10.74170" W (-99.902983)
       Elevation (m)          : -5.9479 m Ell. Height
     Additional Information   : Located in the Yacht Club of Acapulco
                              : at the end of the peers on the top of the 
                              : UNAM tide gauge station 
                              : Coordinate system used is (WGS84).


3.   GPS Receiver Information

3.1  Receiver Type            : LEICA SR520
     Serial Number            : 20146 (82140-R4)
     Firmware Version         : 4.01 (v4.20)
     Date Installed           : 11-JAN-2004 01:00 UT
     Date Removed             : 21-JAN-2004
     Additional Information   : Antenna cable ~10m
    			      : 256MB Memory 

3.2  Receiver Type            : LEICA RS500
     Serial Number            : 82140
     Firmware Version         : 4.20
     Date Installed           : 21-JAN-2004
     Date Removed             : 25-oct-2006
     Satellite System         : GPS
     Temperature Stabiliz.    : none
     Additional Information   :

3.3  Receiver Type            : LEICA GRX1200
     Serial Number            : 459894
     Firmware Version         : 4.03
     Date Installed           : 25-oct-2006
     Date Removed             : 
     Satellite System         : GPS
     Temperature Stabiliz.    : none
     Additional Information   :


3.x  Receiver Type            : 
     Serial Number            : 
     Firmware Version         : 
     Date Installed           : 
     Date Removed             :
     Satellite System         : (GPS/GLONASS/GPS+GLONASS)
     Temperature Stabiliz.    : (none or tolerance in degrees C)
     Additional Information   :


4.   GPS Antenna Information

4.1  Antenna Type             : LEIAT504
     Serial Number            : 310
     Antenna Height (m)       : 2.9005 over the BM 1214
     Antenna Reference Point  : BASE
     Degree Offset from North : 0
     Antenna Radome Type      : LEICA dome
     Date Installed           : 11-JAN-2004
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Antenna height is measured from the
                              : lower surface of the antenna base (BPA) to the 
                              : benchmark # 1214 (located ~2m to the left from the 
                              : left front corner of the tide gauge building)
                              : 
                              : The height of Benchmark # 1214 to the water level 
                              : was ~0.85m at 19:25 UT 12-06-2004. Tide gauge reading
                              : 5.3 f

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)


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Input Frequency        :
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

6.x  Standard Type            : (INTERNAL or EXTERNAL H-MASER/CESIUM/etc)
       Input Frequency        : (if external)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)


11.   On-Site, Point of Contact Agency Information

     Agency                   : Departamento de Sismologia
     Mailing Address          : Instituto de Geofisica - UNAM
                              : Universidad Nacional Autonoma de Mexico 
                              : Coyoacan, 04510 Mexico, D.F.
     Primary Contact          
       Contact Name           : Dr. Vladimir Kostoglodov
       Telephone (primary)    : 5622-4138 ext. 35
       Telephone (secondary)  : 5622-4127
       Fax                    : 5616-2547
       E-mail                 : vladi@servidor.unam.mx
     Secondary Contact        
       Contact Name           : Jose Antonio Santiago Santiago
       Telephone (primary)    : 5622-4126 ext. 23
       Telephone (secondary)  : 5622-4127
       Fax                    : 5616-2547
       E-mail                 : santiago@geofisica.unam.mx
     Additional Information   : santiago@ssn.ssn.unam.mx



11.  More Information

     URL for More Information : http://tlacaelel.igeofcu.unam.mx/~vladimir/gpsred/gpsred.html
     Hardcopy on File
       Site Map               : (Y)
       Site Diagram           : (Y)
       Horizon Mask           : (Y)
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (Y)


     Antenna Graphics with Dimensions
	
LEIAT504
L1/L2 Dorne Margolin antenna with chokerings
(designed after DORNE MARGOLIN T) 
                       +-------+                          <-- 0.1393
                     /     +     \                        <-- 0.1282 L2
                    |      +      |                       <-- 0.1093 L1
  +-----------------+-------------+------------------+    <-- 0.1020 TCR
  |                                                  | 
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.0380
+-------------------+-------------+--------------------+  <-- 0.1020 BCR
                    |             |
                    |             |
                    +------x------+                       <-- 0.000  BPA=ARP

<--                      0.3794                      -->


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