CRO100VIR Site Information Form (site log) International GNSS Service See Instructions at: https://files.igs.org/pub/station/general/sitelog_instr_v2.0.txt 0. Form Prepared by (full name) : Tatevik Shakhbandaryan Date Prepared : 2023-03-05 Report Type : UPDATE If Update: Previous Site Log : cro1_20210805.log Modified/Added Sections : 3.16,3.17 1. Site Identification of the GNSS Monument Site Name : St. Croix VLBA Nine Character ID : CRO100VIR Monument Inscription : St. Croix VLBA RM 1 IERS DOMES Number : 43201M001 CDP Number : 4023 Monument Description : PILLAR Height of the Monument : 0.635 m Monument Foundation : Foundation Depth : Marker Description : Stainless steel plate Date Installed : 1994-01-16T00:00Z Geologic Characteristic : Bedrock Type : Bedrock Condition : Fracture Spacing : Fault zones nearby : Distance/activity : Additional Information : (multiple lines) : The monument is a 0.457m diameter stainless : steel plate set in a 0.762m diameter : monolith that projects 0.635m above grade. : Antenna is mounted and secured in a stainless : steel ring assembly secured to the concrete : monolith. : The monument is located approximately 82m : northwest of the 25m VLBA antenna. 2. Site Location Information City or Town : Christiansted State or Province : Country or Region : VIR Tectonic Plate : CARIBBEAN Approximate Position (ITRF) X coordinate (m) : 2607771.4940 Y coordinate (m) : -5488076.9970 Z coordinate (m) : 1932768.0602 Latitude (N is +) : +174524.84 Longitude (E is +) : -0643503.55 Elevation (m,ellips.) : -31.5 Additional Information : The site is located at the NRAO VLBA : on the northeast tip of St. Croix. 3. GNSS Receiver Information 3.1 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T133 Firmware Version : 2.8 Elevation Cutoff Setting : 4 deg Date Installed : 1994-01-16T00:00Z Date Removed : 1995-10-13T00:00Z Temperature Stabiliz. : none Additional Information : 3.2 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T356 Firmware Version : 3.2 link 03/09/95 Elevation Cutoff Setting : 4 deg Date Installed : 1995-10-13T00:00Z Date Removed : 1999-09-30T17:00Z Temperature Stabiliz. : none Additional Information : 3.3 Receiver Type : AOA SNR-8100 ACT Satellite System : GPS Serial Number : R141 Firmware Version : 3.3.32.2 Elevation Cutoff Setting : 4 deg Date Installed : 1999-09-30T17:00Z Date Removed : 2000-04-14T00:00Z Temperature Stabiliz. : none Additional Information : 3.4 Receiver Type : AOA SNR-8100 ACT Satellite System : GPS Serial Number : R141 Firmware Version : 3.3.32.2 1s soc2rnx Elevation Cutoff Setting : 4 deg Date Installed : 2000-04-14T00:00Z Date Removed : 2000-11-14T00:00Z Temperature Stabiliz. : none Additional Information : samplerate - 1s : offload format - soc : conversion to 30s - soc2rnx 3.5 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP020003804 Firmware Version : CDOO 1s soc2rnx Elevation Cutoff Setting : 4 deg Date Installed : 2000-11-14T00:00Z Date Removed : 2001-05-25T00:00Z Temperature Stabiliz. : none Additional Information : samplerate - 1s : offload format - soc : conversion to 30s - soc2rnx 3.6 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP020004507 Firmware Version : CD00-1D02 Elevation Cutoff Setting : 4 deg Date Installed : 2001-05-25T00:00Z Date Removed : 2005-01-19T00:00Z Temperature Stabiliz. : none Additional Information : 3.7 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP03460 Firmware Version : CD00-1D02 Elevation Cutoff Setting : 4 deg Date Installed : 2005-08-04T00:00Z Date Removed : 2006-02-22T17:30Z Temperature Stabiliz. : none Additional Information : 3.8 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200345005 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2006-02-24T00:00Z Date Removed : 2010-07-07T23:00Z Temperature Stabiliz. : none Additional Information : 3.9 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : IR2200722005 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2010-07-08T00:00Z Date Removed : 2018-03-02T00:00Z Temperature Stabiliz. : none Additional Information : NEW ACROSSER PC,APC 750XL UPS, : 2X1 POWERED SPLITTER : RCVR UV# 71315 3.10 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL Serial Number : 02460 Firmware Version : 3.6.7 Elevation Cutoff Setting : 0 deg Date Installed : 2018-03-02T00:00Z Date Removed : 2018-08-29T19:02Z Temperature Stabiliz. : Additional Information : POWERED SPLITTER REMOVED 3.11 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS Serial Number : 02460 Firmware Version : 3.7.2 Elevation Cutoff Setting : 0 deg Date Installed : 2018-08-29T19:04Z Date Removed : 2019-05-06T04:40Z Temperature Stabiliz. : Additional Information : 3.12 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS Serial Number : 02460 Firmware Version : 3.7.6 Elevation Cutoff Setting : 0 deg Date Installed : 2019-05-06T04:40Z Date Removed : 2020-03-20T23:34Z Temperature Stabiliz. : Additional Information : 3.13 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+QZSS Serial Number : 02460 Firmware Version : 3.7.9 Elevation Cutoff Setting : 0 deg Date Installed : 2020-03-20T23:34Z Date Removed : 2021-01-29T01:00Z Temperature Stabiliz. : Additional Information : 3.14 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS Serial Number : 02460 Firmware Version : 3.7.9 Elevation Cutoff Setting : 0 deg Date Installed : 2021-01-29T01:00Z Date Removed : 2021-03-08T22:18Z Temperature Stabiliz. : Additional Information : 3.15 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS Serial Number : 02460 Firmware Version : 4.0.02 Elevation Cutoff Setting : 0 deg Date Installed : 2021-03-08T22:18Z Date Removed : 2021-03-12T17:00Z Temperature Stabiliz. : Additional Information : 3.16 Receiver Type : SEPT POLARX5TR Satellite System : GPS+GLO+GAL+BDS Serial Number : 3222540 Firmware Version : 5.4.0 Elevation Cutoff Setting : 0 deg Date Installed : 2021-03-12T17:00Z Date Removed : 2023-02-28T05:01Z Temperature Stabiliz. : none Additional Information : 3.17 Receiver Type : SEPT POLARX5TR Satellite System : GPS+GLO+GAL+BDS Serial Number : 3222540 Firmware Version : 5.5.0 Elevation Cutoff Setting : 0 deg Date Installed : 2023-02-28T05:01Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : none Additional Information : 3.x Receiver Type : (A20, from rcvr_ant.tab; see instructions) Satellite System : (GPS+GLO+GAL+BDS+QZSS+SBAS) Serial Number : (A20, but note the first A5 is used in SINEX) Firmware Version : (A11) Elevation Cutoff Setting : (deg) Date Installed : (CCYY-MM-DDThh:mmZ) Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : (none or tolerance in degrees C) Additional Information : (multiple lines) 4. GNSS Antenna Information 4.1 Antenna Type : AOAD/M_T JPLA Serial Number : 133 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0614 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : JPLA Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1994-01-16T00:00Z Date Removed : 1995-10-13T00:00Z Additional Information : 4.2 Antenna Type : AOAD/M_T JPLA Serial Number : 484 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0814 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : JPLA Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1995-10-13T00:00Z Date Removed : 2005-01-19T00:00Z Additional Information : changed "BPA" to "ARP" here : as they are the same in this case 4.3 Antenna Type : ASH701945G_M JPLA Serial Number : CR5200404026 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0814 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : JPLA Radome Serial Number : Antenna Cable Type : Andrews LMR600 Antenna Cable Length : 100 m Date Installed : 2005-08-04T00:00Z Date Removed : 2011-04-01T13:00Z Additional Information : 4.4 Antenna Type : ASH701945G_M NONE Serial Number : CR5200404026 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0814 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : LMR600 Antenna Cable Length : 100 m Date Installed : 2011-04-01T13:10Z Date Removed : 2011-06-24T18:40Z Additional Information : Radome Removed 4.5 Antenna Type : ASH701945G_M JPLA Serial Number : CR5200404026 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0814 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : Antenna Radome Type : JPLA Radome Serial Number : Antenna Cable Type : LMR600 Antenna Cable Length : 100 m Date Installed : 2011-06-24T21:15Z Date Removed : 2015-09-24T16:00Z Additional Information : Radome re-installed 4.6 Antenna Type : JAVRINGANT_DM SCIS Serial Number : 00843 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.6435 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : SCIS Radome Serial Number : 0784 Antenna Cable Type : Times Microwave LMR600 Antenna Cable Length : 100 m Date Installed : 2015-09-24T17:00Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : Additional stainless steel hardware was : added to the ring assembly. The antenna : height was increased by .56212 m from .08176 m. : The original spike in the mount was remeasured : to : be .08176, not .0814 mm in height. 4.x Antenna Type : (A20, from rcvr_ant.tab; see instructions) Serial Number : (A*, but note the first A5 is used in SINEX) Antenna Reference Point : (BPA/BCR/XXX from "antenna.gra"; see instr.) Marker->ARP Up Ecc. (m) : (F8.4) Marker->ARP North Ecc(m) : (F8.4) Marker->ARP East Ecc(m) : (F8.4) Alignment from True N : (deg; + is clockwise/east) Antenna Radome Type : (A4 from rcvr_ant.tab; see instructions) Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : (CCYY-MM-DDThh:mmZ) Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : (multiple lines) 5. Surveyed Local Ties 5.x Tied Marker Name : Tied Marker Usage : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc) Tied Marker CDP Number : (A4) Tied Marker DOMES Number : (A9) Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : (m) dy (m) : (m) dz (m) : (m) Accuracy (mm) : (mm) Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : (multiple lines) 6. Frequency Standard 6.1 Standard Type : INTERNAL Input Frequency : Effective Dates : 1995-10-13/1999-10-08 Notes : 6.2 Standard Type : EXTERNAL H-MASER Input Frequency : 5.0 MHz Effective Dates : 1999-10-08/2000-11-14 Notes : 6.3 Standard Type : EXTERNAL H-MASER Input Frequency : 5.0 MHz Effective Dates : 2000-11-14/2002-09-06 Notes : z12 clock steering off 6.4 Standard Type : INTERNAL Input Frequency : Effective Dates : 2002-09-06/2005-01-19 Notes : z12 clock steering on 6.5 Standard Type : EXTERNAL H-MASER Input Frequency : 5.0 MHz Effective Dates : 2005-08-04/2006-02-23 Notes : 5 dB attenuator inline w/ H-Maser cable 6.6 Standard Type : EXTERNAL H-MASER Input Frequency : 5.0 MHz Effective Dates : 2006-02-24/2010-07-07 Notes : 25 dB attenuator inline w/ H-Maser cable 6.7 Standard Type : INTERNAL Input Frequency : Effective Dates : 2010-07-08/2010-07-14 Notes : 25 dB ATTENUATOR REMOVED, : NEW 10 db ATTENUATOR INSTALLED : BNC CABLES REPLACED 6.8 Standard Type : INTERNAL Input Frequency : Effective Dates : 2010-07-14/2010-07-19 Notes : 10 db ATTENUATOR REMOVED 2010-07-14T13:03Z 6.9 Standard Type : EXTERNAL H-MASER Input Frequency : 5.0 MHz Effective Dates : 2010-07-19/2017-09-05 Notes : 6.10 Standard Type : INTERNAL Input Frequency : Effective Dates : 2017-09-05/2018-03-02 Notes : Locals put the Maser in a sleep mode in : preparation of Hurricane Irma (Category 5 : storm). 6.11 Standard Type : EXTERNAL - H-MASER Input Frequency : 1.0 MHz Effective Dates : 2018-03-02/2018-03-02 Notes : Effective End Date is guesstimate. Based on : current (2019-04-08) CRO1 frequency source of : internal clock. : ** 2023-03-31 SLM 2.0 altered field : input_frequency from its original value: 1Hz 6.12 Standard Type : INTERNAL Input Frequency : Effective Dates : 2018-03-02/2021-03-12 Notes : Effective Start Date is guesstimate. Based on : current (2019-04-08) CRO1 frequency source of : internal clock. 6.13 Standard Type : EXTERNAL H-MASER Input Frequency : 10.0 MHz Effective Dates : 2021-03-12/CCYY-MM-DD Notes : 1 PPS signal also provided by H-Maser to rx. 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) 7. Collocation Information 7.1 Instrumentation Type : VLBI Status : PERMANENT Effective Dates : CCYY-MM-DD/CCYY-MM-DD Notes : 7.x Instrumentation Type : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc) Status : (PERMANENT/MOBILE) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8. Meteorological Instrumentation 8.1.x Humidity Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy (% rel h) : (% rel h) Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.2.x Pressure Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy : (hPa) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.3.x Temp. Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy : (deg C) Aspiration : (UNASPIRATED/NATURAL/FAN/etc) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.4.x Water Vapor Radiometer : Manufacturer : Serial Number : Distance to Antenna : (m) Height Diff to Ant : (m) Calibration date : (CCYY-MM-DD) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Notes : (multiple lines) 8.5.x Other Instrumentation : (multiple lines) 9. Local Ongoing Conditions Possibly Affecting Computed Position 9.1.x Radio Interferences : (TV/CELL PHONE ANTENNA/RADAR/etc) Observed Degradations : (SN RATIO/DATA GAPS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.2.x Multipath Sources : (METAL ROOF/DOME/VLBI ANTENNA/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 9.3.x Signal Obstructions : (TREES/BUILDINGS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 10. Local Episodic Effects Possibly Affecting Data Quality 10.1 Date : 2012-02-03/2012-02-03 Event : Transitioned from .soc to .ash data types. For : soc data typed used soc2rnx to do the : conversion to RINEX data. For ash data types : using teqc directly to do the conversion to : RINEX. 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : National Radio Astronomy Observatory (NRAO) Preferred Abbreviation : 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 : Pete Allen/Greg Worrell Telephone (primary) : (340) 773-4448 Telephone (secondary) : Fax : E-mail : scvlba@aoc.nrao.edu Secondary Contact Contact Name : Paul Rhodes Telephone (primary) : Telephone (secondary) : Fax : E-mail : prhodes@aoc.nrao.edu Additional Information : 12. Responsible Agency (if different from 11.) Agency : Jet Propulsion Laboratory Preferred Abbreviation : 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 : UNAVCO Network Engineer Telephone (primary) : 303-381-7500 Telephone (secondary) : Fax : 303-381-7451 E-mail : ggn-ops@postal.unavco.org Additional Information : 13. More Information Primary Data Center : JPL Secondary Data Center : CDDIS URL for More Information : Hardcopy on File Site Map : Y Site Diagram : Y Horizon Mask : N Monument Description : Y Site Pictures : Y Additional Information : Antenna Graphics with Dimensions JAVRINGANT_DM --------- / \ | | +-------------------------------------------------+ <-- 0.1015 TCR | | | | | | | | +-+-------------------------------------------------+-+ <-- 0.0379 +-------------------+-------------+-------------------+ <-- 0.0345 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP NOM=NRP <-- 0.3800 --> ARP: Antenna Reference Point L1 : L1 Phase Center L2 : L2 Phase Center TCR: Top of Chokering BCR: Bottom of Chokering BPA: Bottom of Preamplifier All dimensions are in meters.