HRAO00ZAF Site Information Form (site log) International GNSS Service See Instructions at: ftp://igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Raz Khachikyan Date Prepared : 2018-05-03 Report Type : UPDATE If Update: Previous Site Log : hrao_20180410.log Modified/Added Sections : 3.14 1. Site Identification of the GNSS Monument Site Name : Hartebeesthoek RAO Four Character ID : HRAO Monument Inscription : (none) IERS DOMES Number : 30302M004 CDP Number : Monument Description : CEMENT FILLED STEEL PIPE/PILLAR Height of the Monument : 0.5 m Monument Foundation : CONCRETE BLOCK Foundation Depth : 36 m Marker Description : Date Installed : 1996-09-05T00:00Z Geologic Characteristic : BEDROCK Bedrock Type : IGNEOUS Bedrock Condition : JOINTED Fracture Spacing : 1-10 cm Fault zones nearby : Distance/activity : Additional Information : HRAO is located on the Pretoria Series of the : Transvaal System. Territory occupied or else : underlain by the System embraces the greater : part of the Central Transvaal. The Transvaal : System is of Precambrian age. The antenna and : buildings are situated on Ongeluk Lava : (Andesite). : Geological info from "NASA Space Geodesy : Program:Catalogue of Site Information", : Technical Memorandum 4482, March 1993, p196. : Interlocking steel rod 36 m deep grouted on : the bottom 10 m and isolated in PVC for the : next 15 meters. The antenna mount is a self- : centering adjustable mount on top of the steel : pipe (monument). 2. Site Location Information City or Town : Krugersdorp State or Province : Country : South Africa Tectonic Plate : AFRICAN Approximate Position (ITRF) X coordinate (m) : 5085352.5970 Y coordinate (m) : 2668395.9920 Z coordinate (m) : -2768731.5510 Latitude (N is +) : -255324.38 Longitude (E is +) : +0274113.13 Elevation (m,ellips.) : 1414.3 Additional Information : Latitude, Longitude and Elevation derived from : ITRF96 coordinates at epoch 1997.0, from Z. : Altamimi/IGN. : HartRAO is situated 60 km NW of Johannesburg. : HartRao is a National Research Facility which : operates within the foundation for Research : Development. : Site information from "NASA Space Geodesy : Program:Catalogue of Site Information", : Technical Memorandum 4482, March 1993, p196. 3. GNSS Receiver Information 3.1 Receiver Type : ROGUE SNR-8000 Satellite System : GPS Serial Number : T365 Firmware Version : 3.2 link 03/09/95 Elevation Cutoff Setting : 4 deg Date Installed : 1996-09-05T00:00Z Date Removed : 1998-01-14T00:00Z Temperature Stabiliz. : none Additional Information : 3.2 Receiver Type : ROGUE SNR-12 RM Satellite System : GPS Serial Number : 254 Firmware Version : 3.2.32.4 Elevation Cutoff Setting : 4 deg Date Installed : 1998-01-14T00:00Z Date Removed : 1999-05-25T12:30Z Temperature Stabiliz. : none Additional Information : replaced SNR 8 with SNR 12 3.3 Receiver Type : ROGUE SNR-12 RM Satellite System : GPS Serial Number : 254 Firmware Version : 3.2.32.8 Elevation Cutoff Setting : 4 deg Date Installed : 1999-05-25T12:30Z Date Removed : 2000-04-16T00:00Z Temperature Stabiliz. : none Additional Information : firmware upgrade 3.4 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP019990511 Firmware Version : CC00 1s soc2rnx Elevation Cutoff Setting : 4 deg Date Installed : 2000-04-26T12:30Z Date Removed : 2006-12-28T00:00Z Temperature Stabiliz. : none Additional Information : replaced SNR 12 with Z12 : samplerate - 1s : offload format - soc : conversion to 30s - soc2rnx 3.5 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR520013802 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2007-04-26T00:00Z Date Removed : 2007-12-11T16:22Z Temperature Stabiliz. : none Additional Information : 3.6 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : ZR220001909 Firmware Version : CQ00 Elevation Cutoff Setting : 4 deg Date Installed : 2008-02-14T09:00Z Date Removed : 2009-01-10T10:59Z Temperature Stabiliz. : none Additional Information : 3.7 Receiver Type : ASHTECH UZ-12 Satellite System : GPS Serial Number : UC1200345010 Firmware Version : CN00 Elevation Cutoff Setting : 4 deg Date Installed : 2009-01-15T00:00Z Date Removed : 2012-03-30T17:15Z Temperature Stabiliz. : none Additional Information : 3.8 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP00801 Firmware Version : CD00 Elevation Cutoff Setting : 4 deg Date Installed : 2012-04-12T00:00Z Date Removed : 2014-07-23T01:30Z Temperature Stabiliz. : none Additional Information : 3.9 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.5.5 Elevation Cutoff Setting : 0 deg Date Installed : 2014-07-23T01:35Z Date Removed : 2014-08-21T16:39Z Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 3.10 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.5.6 Elevation Cutoff Setting : 0 deg Date Installed : 2014-08-21T16:40Z Date Removed : 2014-10-22T22:00Z Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 3.11 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.5.7b0 Elevation Cutoff Setting : 0 deg Date Installed : 2014-10-22T22:15Z Date Removed : 2015-01-21T20:39Z Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 : SBAS off : L1 center frq set to 1573 3.12 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.5.8b0-12-52e9 Elevation Cutoff Setting : 0 deg Date Installed : 2015-01-21T20:40Z Date Removed : 2016-02-19T17:05Z Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 : SBAS off : L1 center frq set to 1573 3.13 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.6.4 Elevation Cutoff Setting : 0 deg Date Installed : 2016-02-19T17:15Z Date Removed : 2018-04-10T17:00Z Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 : SBAS off : L1 center frq set to 1573 3.14 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO Serial Number : 01707 Firmware Version : 3.7.2 Elevation Cutoff Setting : 0 deg Date Installed : 2018-04-10T17:15Z Date Removed : CCYY-MM-DDThh:mmZ Temperature Stabiliz. : none Additional Information : Receiver has board version TRE_G3TH_8 : L1 center frq set to 1573 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 NONE Serial Number : 200 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1996-09-05T00:00Z Date Removed : 1998-01-14T00:00Z Additional Information : SS6TRI monument 4.2 Antenna Type : AOAD/M_T NONE Serial Number : 201 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1998-01-14T00:00Z Date Removed : 1999-02-20T00:00Z Additional Information : SS6TRI monument 4.3 Antenna Type : AOAD/M_T NONE Serial Number : 127 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1999-02-20T00:00Z Date Removed : 1999-07-13T07:00Z Additional Information : SS6TRI monument 4.4 Antenna Type : AOAD/M_T NONE Serial Number : 201 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1999-07-13T07:00Z Date Removed : 2003-10-17T08:55Z Additional Information : SS6TRI monument 4.5 Antenna Type : AOAD/M_T NONE Serial Number : 388 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2003-10-17T09:00Z Date Removed : 2004-11-19T10:30Z Additional Information : SS6TRI monument 4.6 Antenna Type : ASH701945C_M NONE Serial Number : CR520003604 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2004-11-19T10:30Z Date Removed : 2005-04-24T00:00Z Additional Information : SS6TRI monument 4.7 Antenna Type : ASH701945C_M NONE Serial Number : CR520003601 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2005-05-03T09:00Z Date Removed : 2006-02-13T12:30Z Additional Information : SS6TRI monument 4.8 Antenna Type : ASH701945C_M NONE Serial Number : CR620012801 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2006-02-14T10:30Z Date Removed : 2006-02-21T18:00Z Additional Information : SS6TRI monument 4.9 Antenna Type : ASH701945C_M NONE Serial Number : CR519992105 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2006-02-23T00:00Z Date Removed : 2006-12-28T00:00Z Additional Information : SS6TRI monument 4.10 Antenna Type : ASH701945C_M NONE Serial Number : CR520003501 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2007-04-26T00:00Z Date Removed : 2007-12-11T16:22Z Additional Information : SS6TRI monument 4.11 Antenna Type : ASH701945E_M NONE Serial Number : CR6200610005 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2008-02-14T09:00Z Date Removed : 2012-11-04T00:00Z Additional Information : SS6TRI monument. The antenna was believed to : have failed on 2009-01-10 and was removed. : Later it was discovered the antenna was good, : so antenna 4.11 was re-installed on 2009-01-15. 4.12 Antenna Type : ASH701945E_M NONE Serial Number : CR6200610005 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2012-11-04T00:30Z Date Removed : 2013-02-21T09:30Z Additional Information : Inline amplifier removed : see section 10.2 4.13 Antenna Type : ASH701945E_M NONE Serial Number : CR6200610005 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 : 0 deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 2013-02-21T10:00Z Date Removed : CCYY-MM-DDThh:mmZ Additional Information : New inline amplifier installed : Manufacturer Raven Industries : Model Number LA-21-L1L2-N 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 5.1 Tied Marker Name : 26 m VLBI antenna Tied Marker Usage : Tied Marker CDP Number : Tied Marker DOMES Number : 30302S001 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : 90.280 dy (m) : -132.198 dz (m) : 34.658 Accuracy (mm) : 10 mm Survey method : Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : ITRF96 coordinates epoch 1997 : for HRAO and VLBI points differential : components : The SLR/VLBI/HRAO/HART/DORIS differential : components will be determined in a high : precision GPS survey later this year 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 : 1996-09-05/1998-05-05 Notes : 6.2 Standard Type : EXTERNAL H-MASER Input Frequency : 5 MHz Effective Dates : 1998-05-05/2000-04-26 Notes : 6.3 Standard Type : INTERNAL Input Frequency : Effective Dates : 2000-04-26/2000-11-15 Notes : 6.4 Standard Type : EXTERNAL H-MASER Input Frequency : 5 MHz Effective Dates : 2000-11-15/2002-05-07 Notes : 6.5 Standard Type : INTERNAL Input Frequency : Effective Dates : 2002-05-07/2003-11-17 Notes : 6.6 Standard Type : EXTERNAL H-MASER Input Frequency : 5 MHz Effective Dates : 2003-11-17/CCYY-MM-DD Notes : Oscilloquartz EFOS C maser. 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 : The VLBI telescope routinely participates in : IRIS, CORE-A and Syowa experiments 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 8.1.1 Humidity Sensor Model : Capacitance Probe Manufacturer : Paroscientific Serial Number : Data Sampling Interval : 300 sec Accuracy (% rel h) : ± 2 Aspiration : UNASPIRATED Height Diff to Ant : 10.6 m Calibration date : (CCYY-MM-DD) Effective Dates : 2005-03-24/CCYY-MM-DD Notes : MET unit is 10.6 m below GPS antenna. 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) 8.2.1 Pressure Sensor Model : Digiquartz Barometric Standard Manufacturer : Paroscientific Serial Number : Data Sampling Interval : 300 sec Accuracy : 0.1 hPa Height Diff to Ant : 10.6 m Calibration date : (CCYY-MM-DD) Effective Dates : 2005-03-24/CCYY-MM-DD Notes : MET unit is 10.6 m below GPS antenna. 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) 8.3.1 Temp. Sensor Model : Platinum Resistance Temperature Probe Manufacturer : Paroscientific Serial Number : Data Sampling Interval : 300 sec Accuracy : 0.5 deg C Aspiration : UNASPIRATED Height Diff to Ant : 10.6 m Calibration date : Effective Dates : 2005-03-24/CCYY-MM-DD Notes : MET unit is 10.6 m below GPS antenna. 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) 9.3.1 Signal Obstructions : Antenna not properly mounted Effective Dates : 2008-02-14/2009-01-15 Additional Information : A 2cm North shift was observed after the : antenna was re-installed on 2009-01-15 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 types used soc2rnx to do the : conversion to RINEX data. For ash data types : using teqc directly to do the conversion to : RINEX. 10.2 Date : 2012-11-04/2013-02-21 Event : During this time the station was without : an inline amplifier. Lack of amplifier caused : low observations and high mp1 and mp2 values. 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : Jet Propulsion Laboratory Preferred Abbreviation : JPL Mailing Address : 4800 Oak Grove Drive : Pasadena, CA : USA 91109 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@ls.unavco.org Additional Information : 12. Responsible Agency (if different from 11.) Agency : HartRAO Preferred Abbreviation : HRAO Mailing Address : PO BOX 443 : Krugersdorp : 1740 : South Africa Primary Contact Contact Name : Ludwig Combrinck Telephone (primary) : 27-12-3260742 Telephone (secondary) : Fax : 27-12-3260756 E-mail : ludwig@hartrao.ac.za Secondary Contact Contact Name : Marisa Nickola Telephone (primary) : 27-12-3260742 Telephone (secondary) : Fax : E-mail : marisa@hartrao.ac.za Additional Information : 13. More Information Primary Data Center : JPL Secondary Data Center : CDDIS URL for More Information : Hardcopy on File Site Map : Site Diagram : (Y) Horizon Mask : (Y) Monument Description : (Y) Site Pictures : (Y) Additional Information : Antenna Graphics with Dimensions ASH701945E_M +-------+ / + \ | + | +-----------------+-------------+------------------+ <-- 0.1006 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.0376 +-------------------+-------------+--------------------+ <-- 0.0346 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3794 --> 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 BAM: Bottom of antenna mount All dimensions are in meters.