OHI3 Site Information Form International GPS Service See Instructions at: ftp://igscb.jpl.nasa.gov/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Rudi Stoeger Date Prepared : 2010-01-26 Report Type : UPDATE If Update: Previous Site Log : ohi3_20091126.log Modified/Added Sections : 4.1, 4.2, 13 1. Site Identification of the GNSS Monument Site Name : O'Higgins / Antarctica Four Character ID : OHI3 Monument Inscription : Pillar K3 IERS DOMES Number : 66008M006 CDP Number : Monument Description : PILLAR Height of the Monument : 1.4 Monument Foundation : CONCRETE PILLAR BOLTED ON BEDROCK Foundation Depth : 0.5 Marker Description : SURVEY MARKER WITH THREAD Date Installed : 2002-02-07T00:00Z Geologic Characteristic : Bedrock Bedrock Type : Metamorphic Bedrock Condition : Weathered Fracture Spacing : 50-200 cm Fault zones nearby : (YES/NO/Name of the zone) Distance/activity : (multiple lines) Additional Information : Predominant rocks at the station : O'Higgins are quartz-bearing black, : grey and reddish brown : low-metamorphic clay slates and : phylitte slates of the Trinity : Peninsula Formation. They are very : brittle, fine-laminated in the mm- : and cm-range and incline with about : 60 to 80 degrees to NW. : Because of these characteristics : and the high clay mineral content : and the expansive force resulting : from this the slates are highly : susceptible to weathering and mostly : covered by detrital layers. Only : tectonicly less stressed parts and : parts resistant to weathering stick : out from these detrital masses. These : have a linear geometry and show strong : cleavings. The instrusions of 0.5m to : 1.5m thick vein rocks, which pass : through the slates, are significantly : younger. The pillar with the antenna : is bolted into one of these veins, : which are very resistant to weathering. : An ASHTECH Z18 GPS+GLONASS operated : from 2001-02-09 until 2003-01-27 at : the ERS/VLBI-Station GARS O'Higgins / : Antarctica with the four character ID : OHIZ, DOMES Number 66008M004. : Because of the expansion and of : construction works in the Chilenean : Antarctic Base the antenna : for the GPS+GLONASS Permanent Tracking : Station OHIZ was moved to another : pillar K3, DOMES Number 66008M006. : Number 66008M005, 2003-02-06, : new four character ID OHI3. : In addition and parallel also a : ROGUE SNR-8000 / ACT SNR-8000 ACT : operated from 1995-02-14 until : 2002-02-20 at the ERS/VLBI- Station : GARS O'Higgins / Antarctica with the : four character ID OHIG, on pillar K5, : DOMES Number 66008M001. : Because of the expansion and of : construction works in the Chilenean : Antarctic Base the antenna for the : GPS Permanent Tracking Station OHIG : was moved to another pillar K6, DOMES : Number 66008M005, 2002-02-14, : new four charcater ID OHI2. : For collocation we observed from : 2002-02-14 until 2002-02-20 with two : AOA SNR-8000 ACT at OHIG and OHI2, : and also with the Ashtech Z-18 OHIZ. : 2002-02-14 OHI2 installed. : 2002-02-16 DOME removed in OHIG. : 2002-02-19 DOME installed in OHI2. : 2002-02-20 OHIG removed. : 2003-01-27 OHIZ removed. : 2003-02-06 OHI3 installed. : An AOA SNR-8000 ACT observed until : 2007-11-12 at OHI2 and was replaced : with a JPS E_GGD. : From 2004-03-16 until 2009-11-24 a : JPS E_GGD or a TPS_GGD was operating : at OHI3. : Since 2009-11-24 a LEICA GRX1200GGPRO : is operating. 2. Site Location Information City or Town : O'Higgins State or Province : Country : Antarctic Peninsula Tectonic Plate : Antarctican Approximate Position (ITRF) X coordinate (m) : 1525808.90 Y coordinate (m) : -2432478.50 Z coordinate (m) : -5676166.00 Latitude (N is +) : -631915.941 Longitude (E is +) : -0575404.987 Elevation (m,ellips.) : 00032.15 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : ASHTECH Z18 Satellite System : GPS+GLONASS Serial Number : ZX199909119 Firmware Version : 0064 Elevation Cutoff Setting : 0 Date Installed : 2003-02-06T00:00Z Date Removed : 2004-03-15T00:00Z Temperature Stabiliz. : none Additional Information : New OHI3 at pillar K3 : replaced OHIZ, which operated : since 2001-02-09. 3.2 Receiver Type : JPS E_GGD Satellite System : GPS+GLONASS Serial Number : AFLQXTM48W0 Firmware Version : 2.3 Oct,17,2003 p3 Elevation Cutoff Setting : 0 Date Installed : 2004-03-16T08:00Z Date Removed : 2004-03-24T11:45Z Temperature Stabiliz. : none Additional Information : 3.3 Receiver Type : JPS E_GGD Satellite System : GPS+GLONASS Serial Number : AFLQXTM48W0 Firmware Version : 2.3 Oct,17,2003 p3 Elevation Cutoff Setting : 0 Date Installed : 2004-03-24T11:45Z Date Removed : 2006-01-18T13:00Z Temperature Stabiliz. : none Additional Information : /par/lock/notvis switched : to "on". 3.4 Receiver Type : TPS E_GGD Satellite System : GPS+GLONASS Serial Number : AFLQXTM48W0 Firmware Version : 2.5 Jun,22,2005 p1 Elevation Cutoff Setting : 0 Date Installed : 2006-01-18T13:00Z Date Removed : 2006-02-19T13:00Z Temperature Stabiliz. : none Additional Information : /par/lock/notvis switched : to "on". : The software on the computer : identified the Receiver : with the Serial Number : AFLQXTM48W0, instead of : AG8ZL5K4FLS. 3.5 Receiver Type : TPS E_GGD Satellite System : GPS+GLONASS Serial Number : AG8ZL5K4FLS Firmware Version : 2.5 Jun,22,2005 p1 Elevation Cutoff Setting : 0 Date Installed : 2006-02-19T13:00Z Date Removed : 2007-11-06T09:14Z Temperature Stabiliz. : none Additional Information : Additional number : 235-0642 on the type : level. : /par/lock/notvis switched : to "on". : No actual replacement of : the receiver. New computer : and new Unix Software : identify the true : Serial Number AG8ZL5K4FLS. 3.6 Receiver Type : TPS E_GGD Satellite System : GPS+GLONASS Serial Number : AG8ZL5K4FLS Firmware Version : 2.6.0 Apr,18,2007 Elevation Cutoff Setting : 0 Date Installed : 2007-11-06T09:15Z Date Removed : 2008-01-15T07:59Z Temperature Stabiliz. : none Additional Information : Additional number : 235-0642 on the type : level. : /par/lock/notvis switched : to "on". 3.7 Receiver Type : TPS E_GGD Satellite System : GPS+GLONASS Serial Number : AG8ZL5K4FLS Firmware Version : 2.6.1 JAN,10,2008 Elevation Cutoff Setting : 0 Date Installed : 2008-01-15T08:00Z Date Removed : 2009-11-23T01:59Z Temperature Stabiliz. : none Additional Information : Additional number : 235-0642 on the type : level. : /par/lock/notvis switched : to "on". 3.8 Receiver Type : LEICA GRX1200GGPRO Satellite System : GPS+GLONASS Serial Number : 356531 Firmware Version : 7.53/3.017 Elevation Cutoff Setting : 0 Date Installed : 2009-11-23T02:00Z 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/GLONASS/GPS+GLONASS) Serial Number : (A5) 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 : ASH701941.B SNOW Serial Number : CRL 2199911002 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0050 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : SNOW Radome Serial Number : Antenna Cable Type : RG214 Antenna Cable Length : 33 Date Installed : 2003-02-06T00:00Z Date Removed : 2010-01-22T19:44Z Additional Information : 4.2 Antenna Type : LEIAR25.R3 LEIT Serial Number : 9310010 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0505 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : LEIT Radome Serial Number : Antenna Cable Type : RG214 Antenna Cable Length : 33 Date Installed : 2010-01-22T19:45Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : 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 : VLBI Radiotelescope Tied Marker Usage : VLBI Tied Marker CDP Number : Tied Marker DOMES Number : Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -24.1229 dy (m) : -15.0651 dz (m) : 8.2146 Accuracy (mm) : 1.0 Survey method : TRIANGULATION Date Measured : 2002-02-12T00:00Z Additional Information : Differential Components from the Marker : Pillar K3 OHI3 to the Point of : Axis-Intersection in the VLBI : Radiotelescope. : dx, dy, dz = Marker Pillar K3 OHI3 minus : Axis-Intersection VLBI. 5.2 Tied Marker Name : Pillar K5 = OHIG Tied Marker Usage : GPS Tied Marker CDP Number : Tied Marker DOMES Number : 66008M001 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -63.5731 dy (m) : 2.5741 dz (m) : -20.2217 Accuracy (mm) : 1.0 Survey method : TRIANGULATION Date Measured : 2002-02-12T00:00Z Additional Information : GPS Permanent Tracking Station OHIG : at Pillar K5 from 1995-02-14 until : 2002-02-20. : Differential Components from the Marker : Pillar K3 OHI3 to the Marker Pillar K5 : OHIG. : dx, dy, dz = Marker Pillar K3 OHI3 minus : Marker Pillar K5 OHIG. 5.3 Tied Marker Name : OHIZ Tied Marker Usage : GPS+GLONASS Tied Marker CDP Number : Tied Marker DOMES Number : 66008M004 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -59.6051 dy (m) : -21.0910 dz (m) : -6.2288 Accuracy (mm) : 1.5 Survey method : TRIANGULATION Date Measured : 2002-02-12T00:00Z Additional Information : GPS+GLONASS Permanent Tracking Station : OHIZ from 2001-02-09 until 2003-01-27. : Differential Components from the Marker : Pillar K3 OHI3 to the ARP of the OHIZ : antenna, not to the OHIZ Marker. The : ARP of the OHIZ antenna was 0.1215 m : above the OHIZ Marker. : dx, dy, dz = Marker Pillar K3 OHI3 minus : ARP OHIZ antenna. 5.4 Tied Marker Name : Pillar K6 = OHI2 Tied Marker Usage : GPS+GLONASS Tied Marker CDP Number : Tied Marker DOMES Number : 66008M005 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -2.8291 dy (m) : -0.5150 dz (m) : -0.6918 Accuracy (mm) : 1.0 Survey method : TRIANGULATION Date Measured : 2002-02-12T00:00Z Additional Information : GPS Permanent Tracking Station : OHI2 at pillar K6 since 2002-02-14. : Differentiel Components from the Marker : Pillar K3 OHI3 to the Marker Pillar K6 : OHI2. : dx, dy, dz = Marker Pillar K3 OHI3 minus : Marker Pillar K6 OHI2. 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) : dy (m) : dz (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 : 2003-02-06/2009-11-26 Notes : 6.2 Standard Type : EXTERNAL CESIUM Input Frequency : 5 MHz Effective Dates : 2009-11-26/CCYY-MM-DD Notes : External input reference : oscillator. Cesium. 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 : 1995-01-01/CCYY-MM-DD Notes : 2 VLBI-measurements in campaigns : each year 7.2 Instrumentation Type : GPS ROGUE SNR-8000 / AOA SNR-8000 ACT Status : PERMANENT Effective Dates : 1995-02-14/2002-02-20 Notes : Four Character ID OHIG 7.3 Instrumentation Type : GPS+GLONASS ASHTECH Z18 Status : PERMANENT Effective Dates : 2001-02-09/2003-01-27 Notes : Four Character ID OHIZ 7.4 Instrumentation Type : GPS AOA SNR-8000 ACT Status : PERMANENT Effective Dates : 2002-02-14/2007-11-12 Notes : Four Character ID OHI2 7.5 Instrumentation Type : GPS+GLONASS JPS E_GGD Status : PERMANENT Effective Dates : 2007-11-12/CCYY-MM-DD Notes : Four Character ID OHI2 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 : MP408A Manufacturer : ROTRONIC Serial Number : Data Sampling Interval : 900 Accuracy (% rel h) : 1.5 Aspiration : CAPACITANCE PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 1995-02-14/2003-02-25 Notes : The Humidity Sensor was : 1.0 m above the antenna. : Meteorological Data are available : from OHIG until 2002-02-30, and : from OHI2 since 2002-02-14. 8.1.2 Humidity Sensor Model : HUGER-WS Manufacturer : HUGER Serial Number : Data Sampling Interval : 900 Accuracy (% rel h) : 2 Aspiration : CAPACITANCE PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-02-25/2003-11-03 Notes : The Humidity Sensor was : 1.0 m above the antenna. : Temporary replacement of : damaged MP408A Sensor. : Meteorological Data are available : from OHI2. 8.1.3 Humidity Sensor Model : MP408A Manufacturer : ROTRONIC Serial Number : Data Sampling Interval : 900 Accuracy (% rel h) : 1.5 Aspiration : CAPACITANCE PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-11-03/CCYY-MM-DD Notes : The Humidity Sensor is : 1.0 m above the antenna. : Meteorological Data are available : from OHI2. 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 : APS Manufacturer : ROESSLER + CIE Serial Number : Data Sampling Interval : 900 Accuracy : 0.1 Height Diff to Ant : 1.1 Calibration date : (CCYY-MM-DD) Effective Dates : 1995-02-14/2003-02-25 Notes : The Pressure Sensor was : 1.1 m below the antenna. : Meteorological Data are available : from OHIG until 2002-02-30, and : from OHI2 since 2002-02-14. 8.2.2 Pressure Sensor Model : HUGER-WS Manufacturer : HUGER Serial Number : Data Sampling Interval : 900 Accuracy : 1 Height Diff to Ant : 0.6 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-02-25/2003-11-03 Notes : The Pressure Sensor was : 0.6 m below the antenna. : Temporary replacement of : damaged APS Sensor. : Meteorological Data are available : from OHI2. 8.2.3 Pressure Sensor Model : APS 9215 Manufacturer : L-TEC Leibenguth Serial Number : 0538 3401A Data Sampling Interval : 900 Accuracy : 0.1 Height Diff to Ant : 1.1 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-11-03/CCYY-MM-DD Notes : The Pressure Sensor is : 1.1 m below the antenna. : Meteorological Data are available : from OHI2. 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 : MP408A Manufacturer : ROTRONIC Serial Number : Data Sampling Interval : 900 Accuracy : 0.3 Aspiration : PLATINUM PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 1995-02-14/2003-02-25 Notes : The Temperature Sensor was : 1.0 m above the antenna. : Meteorological Data are available : from OHIG until 2002-02-30, and : from OHI2 since 2002-02-14. 8.3.2 Temp. Sensor Model : HUGER-WS Manufacturer : HUGER Serial Number : Data Sampling Interval : 900 Accuracy : 0.5 Aspiration : PLATINUM PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-02-25/2003-11-03 Notes : The Temperature Sensor was : 1.0 m above the antenna. : Temporary replacement for a : damaged MP408A Sensor. : Meteorological Data are available : from OHI2. 8.3.3 Temp. Sensor Model : MP408A Manufacturer : ROTRONIC Serial Number : Data Sampling Interval : 900 Accuracy : 0.3 Aspiration : PLATINUM PROBE Height Diff to Ant : -1.0 Calibration date : (CCYY-MM-DD) Effective Dates : 2003-11-03/CCYY-MM-DD Notes : The Temperature Sensor is : 1.0 m above the antenna. : Meteorological Data are available : from OHI2. 8.3.x Temp. Sensor Model : Manufacturer : Serial Number : Data Sampling Interval : (sec) Accuracy : (hPa) 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 : 9. Local Ongoing Conditions Possibly Affecting Computed Position 9.1.x Radio Interferences : (TV/CELL PHONE ANTENNA/RADAR/etc) Observed Degredations : (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/BUILDLINGS/etc) Effective Dates : (CCYY-MM-DD/CCYY-MM-DD) Additional Information : (multiple lines) 10. Local Episodic Effects Possibly Affecting Data Quality 10.x Date : (CCYY-MM-DD/CCYY-MM-DD) Event : (TREE CLEARING/CONSTRUCTION/etc) 11. On-Site, Point of Contact Agency Information Agency : Bundesamt fuer Kartographie : und Geodaesie Preferred Abbreviation : BKG Mailing Address : Bundesamt fuer Kartographie : und Geodaesie : Aussenstelle Leipzig : Karl-Rothe-Strasse 10 - 14 : D-04105 Leipzig : Germany Primary Contact Contact Name : : Reiner Wojdziak Telephone (primary) : ++49-341-5634204 Telephone (secondary) : ++49-341-56340 Fax : ++49-341-5634415 E-mail : reiner.wojdziak@bkg.bund.de Secondary Contact Contact Name : Telephone (primary) : Telephone (secondary) : Fax : E-mail : Additional Information : all contact names at 12. 12. Responsible Agency (if different from 11.) Agency : Bundesamt fuer Kartographie : und Geodaesie : Geodetical Observatory Wettzell Preferred Abbreviation : BKG Mailing Address : Bundesamt fuer Kartographie : und Geodaesie : Geodetical Observatory Wettzell : Sackenrieder Strasse 25 : D-93444 Bad Koetzting : Germany Primary Contact Contact Name : Dr. Reiner Dassing Telephone (primary) : ++49-9941-603112 Telephone (secondary) : ++49-9941-6030 Fax : ++49-9941-603222 E-mail : reiner.dassing@bkg.bund.de Secondary Contact Contact Name : Uwe Hessels Telephone (primary) : ++49-9941-603208 Telephone (secondary) : ++49-9941-6030 Fax : ++49-9941-603222 E-mail : uwe.hessels@bkg.bund.de Additional Information : Klaus Roettcher : ++49-9941-603115 : klaus.roettcher@bkg.bund.de : Rudi Stoeger : ++49-9941-603117 : rudolf.stoeger@bkg.bund.de 13. More Information Primary Data Center : BKGI Secondary Data Center : IGN URL for More Information : www.ifag.de, www.leipzig.ifag.de Hardcopy on File Site Map : Y Site Diagram : Y Horizon Mask : Y Monument Description : Y Site Pictures : Y Additional Information : Antenna Graphics with Dimensions ASH701941.B From 2003-02-06 until 2010-01-22 +---------+ / + \ <-- 0.1267 L2 | + | <-- 0.1080 L1 +-----------------+-------------+------------------+ <-- 0.1008 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.0378 +-------------------+-------------+--------------------+ <-- 0.0348 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3794 --> LEIAR25.R3 From 2010-01-22 +-------+ <-- 0.1995 / \ +---+-------------+---+ <-- 0.1614 TCR | | |---------------------------| |---------------------------------| |---------------------------------------| +---------------------------------------------+ | | | | +-+---------------------------------------------+-+ +-----------------+-------------+-----------------+ <-- 0.0320 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3802 --> 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 All dimensions are in meters.