FFMJ Site Information Form (site log) International GNSS Service See Instructions at: https://files.igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : GREF Operator (operator.gref@bkg.bund.de) Date Prepared : 2024-02-15 Report Type : UPDATE If Update: Previous Site Log : ffmj_20230427.log Modified/Added Sections : 2, 3.18, 3.19, 8.1.1, 8.1.2, 8.2.1, 8.3.2, : 8.3.1, 13 1. Site Identification of the GNSS Monument Site Name : Frankfurt / Main Four Character ID : FFMJ Monument Inscription : IERS DOMES Number : 14279M001 CDP Number : (A4) Monument Description : aluminium mast-Platform on the roof Height of the Monument : (m) Monument Foundation : Aluminium-Mast fastened on vertical Foundation Depth : (m) Marker Description : SURVEY MARKER BOLT ON ALUMINIUM-MAST Date Installed : 2002-02-18T12:00Z Geologic Characteristic : (BEDROCK/CLAY/CONGLOMERATE/GRAVEL/SAND/etc) Bedrock Type : (IGNEOUS/METAMORPHIC/SEDIMENTARY) Bedrock Condition : (FRESH/JOINTED/WEATHERED) Fracture Spacing : (0 cm/1-10 cm/11-50 cm/51-200 cm/over 200 cm) Fault zones nearby : (YES/NO/Name of the zone) Distance/activity : (multiple lines) Additional Information : The system is installed on the roof of the : BKG building at Frankfurt. : Antenna mounted with a special screw : adapter on the mast. 2. Site Location Information City or Town : Frankfurt / Main State or Province : Hessen Country : Germany Tectonic Plate : EURASIAN Approximate Position (ITRF) X coordinate (m) : 4053455.700 Y coordinate (m) : 617729.900 Z coordinate (m) : 4869395.900 Latitude (N is +) : +500526.09 Longitude (E is +) : +0083953.89 Elevation (m,ellips.) : 178.3 Additional Information : (multiple lines) 3. GNSS Receiver Information 3.1 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : E_GGD_2/2.2 Elevation Cutoff Setting : 5 deg Date Installed : 2002-02-18T12:00Z Date Removed : 2002-10-09T12:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.2 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : E_GGD_2/2.2p2 Elevation Cutoff Setting : 5 deg Date Installed : 2002-10-09T12:00Z Date Removed : 2003-11-17T12:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.3 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : E_GGD_2/2.3p3 Elevation Cutoff Setting : 5 deg Date Installed : 2003-11-17T12:00Z Date Removed : 2006-11-15T12:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.4 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : E_GGD_2/2.5p2 Elevation Cutoff Setting : 5 deg Date Installed : 2006-11-15T12:00Z Date Removed : 2007-06-01T08:00Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.5 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : 2.6.0 APR,18,2007 Elevation Cutoff Setting : 0 deg Date Installed : 2007-06-01T08:00Z Date Removed : 2008-01-25T10:45Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.6 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AGBV83QBWN4 Firmware Version : 2.6.1 JAN,10,2008 Elevation Cutoff Setting : 0 deg Date Installed : 2008-01-25T10:45Z Date Removed : 2012-09-21T07:50Z Temperature Stabiliz. : none Additional Information : (multiple lines) 3.7 Receiver Type : JPS LEGACY Satellite System : GPS+GLO Serial Number : AFP2LB8MMM8 Firmware Version : 3.4 DEC,12,2009 p2 Elevation Cutoff Setting : 0 deg Date Installed : 2012-09-21T08:10Z Date Removed : 2014-04-02T10:30Z Temperature Stabiliz. : none Additional Information : Additional Number : LE5787 on the : type level 3.8 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO+GAL+SBAS Serial Number : 01587 Firmware Version : 3.5.5 MAR,03,2014 Elevation Cutoff Setting : 0 deg Date Installed : 2014-04-02T11:30Z Date Removed : 2016-08-08T12:30Z Temperature Stabiliz. : none Additional Information : Board Id : 03VCFXT1UPXR123OK1AUP94U5M 3.9 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 01587 Firmware Version : 3.6.6 APR,27,2016 Elevation Cutoff Setting : 0 deg Date Installed : 2016-08-08T12:30Z Date Removed : 2017-06-01T12:00Z Temperature Stabiliz. : none Additional Information : Board Id : 03VCFXT1UPXR123OK1AUP94U5M 3.10 Receiver Type : JAVAD TRE_G3TH DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 01587 Firmware Version : 3.7.1 APR,04,2017 Elevation Cutoff Setting : 0 deg Date Installed : 2017-06-01T12:00Z Date Removed : 2019-01-16T10:00Z Temperature Stabiliz. : none Additional Information : Board Id : 03VCFXT1UPXR123OK1AUP94U5M 3.11 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 3.7.5 DEC,06,2018 Elevation Cutoff Setting : 0 deg Date Installed : 2019-01-16T10:00Z Date Removed : 2019-01-29T12:20Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.12 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 3.7.5p1 JAN,23,2019 Elevation Cutoff Setting : 0 deg Date Installed : 2019-01-29T12:30Z Date Removed : 2019-05-17T10:15Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.13 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 3.7.6 APR,08,2019 Elevation Cutoff Setting : 0 deg Date Installed : 2019-05-17T10:15Z Date Removed : 2020-03-12T09:25Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.14 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 3.7.9 DEC,30,2019 Elevation Cutoff Setting : 0 deg Date Installed : 2020-03-12T09:35Z Date Removed : 2020-11-05T09:50Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.15 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 3.7.10 Oct,22,2020 Elevation Cutoff Setting : 0 deg Date Installed : 2020-11-05T09:50Z Date Removed : 2021-08-31T08:40Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.16 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 4.1.03-210713 Elevation Cutoff Setting : 0 deg Date Installed : 2021-08-31T08:40Z Date Removed : 2022-03-03T06:19Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.17 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 4.1.04-211206 Elevation Cutoff Setting : 0 deg Date Installed : 2022-03-03T06:19Z Date Removed : 2023-02-08T09:08Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.18 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 4.1.06-221128 Elevation Cutoff Setting : 0 deg Date Installed : 2023-02-08T09:08Z Date Removed : 2024-02-15T07:46Z Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.19 Receiver Type : JAVAD TRE_3 DELTA Satellite System : GPS+GLO+GAL+BDS+SBAS Serial Number : 02884 Firmware Version : 4.3.00-231129 Elevation Cutoff Setting : 0 deg Date Installed : 2024-02-15T07:46Z Date Removed : CCYY-MM-DDThh:mmZ Temperature Stabiliz. : none Additional Information : Board Id : 1I3W3LQ8D2UY90QDSPVJA2QGHS 3.x Receiver Type : (A20, from rcvr_ant.tab; see instructions) Satellite System : (GPS+GLO+GAL+BDS+QZSS+IRNSS+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 : JPSREGANT_SD_E2 NONE Serial Number : RA0294 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0000 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 : Aircom plus Antenna Cable Length : 65 m Date Installed : 2002-02-18T12:00Z Date Removed : 2005-05-19T08:00Z Additional Information : Antenna type listed in this section retro- : actively changed from JPSREGANT_SD_E to : JPSREGANT_SD_E2 starting with log file : ffmj_20121007.log. See IGSMAIL-6662 and : IGSMAIL-6663 for details. 4.2 Antenna Type : TPSCR3_GGD CONE Serial Number : 217-0111 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0000 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : CONE Radome Serial Number : Antenna Cable Type : Aircom plus Antenna Cable Length : 65 m Date Installed : 2005-05-19T08:00Z Date Removed : 2008-02-20T11:00Z Additional Information : (multiple lines) 4.3 Antenna Type : TPSCR3_GGD CONE Serial Number : 217-0111 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0450 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : CONE Radome Serial Number : Antenna Cable Type : Aircom plus Antenna Cable Length : 65 m Date Installed : 2008-02-20T11:00Z Date Removed : 2011-02-08T10:00Z Additional Information : (multiple lines) 4.4 Antenna Type : LEIAR25.R4 LEIT Serial Number : 10231013 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0450 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : LEIT Radome Serial Number : Antenna Cable Type : Aircom plus Antenna Cable Length : 65 m Date Installed : 2011-02-08T10:30Z Date Removed : 2019-01-16T10:14Z Additional Information : Antenna individual : calibrated absolute at Geo++ 4.5 Antenna Type : LEIAR25.R3 LEIT Serial Number : 10020025 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0450 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : LEIT Radome Serial Number : Antenna Cable Type : Aircom plus Antenna Cable Length : 65 m Date Installed : 2019-01-16T10:14Z Date Removed : 2019-09-04T10:53Z Additional Information : Antenna individual calibrated absolute by : Uni Bonn and GEO++ 4.6 Antenna Type : LEIAR25.R3 LEIT Serial Number : 09050002 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0450 Marker->ARP North Ecc(m) : 0.0000 Marker->ARP East Ecc(m) : 0.0000 Alignment from True N : 0 deg Antenna Radome Type : LEIT Radome Serial Number : Antenna Cable Type : Aircom plus Antenna Cable Length : 65 m Date Installed : 2019-09-04T10:53Z Date Removed : CCYY-MM-DDThh:mmZ Additional Information : Antenna individual calibrated absolutely by : : GEO++ - ROBOT 2010-07-01 : : UNI BONN - CHAMBER 2010-08-06 : : Senatsverwaltung Berlin - ROBOT 2019-06-19 : : UNI BONN - CHAMBER 2019-07-19 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 : (if external) Effective Dates : 2002-02-18/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) 7. Collocation Information 7.1 Instrumentation Type : GNSS FFMJ01DEU Status : PERMANENT Effective Dates : 2016-07-30/CCYY-MM-DD Notes : Secondary Receiver at the same antenna. : More information and data available on : request. 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 : PTU200 Manufacturer : Vaisala Oyi Serial Number : W5110012 Data Sampling Interval : 10 sec Accuracy (% rel h) : 2 % rel h Aspiration : HUMICAP 180 CAPACITIVY THIN FILM POLYMER Height Diff to Ant : -0.5 m Calibration date : (CCYY-MM-DD) Effective Dates : 2002-02-18/2011-02-08 Notes : The Humidity Sensor is 0.1m : below the antenna 8.1.2 Humidity Sensor Model : HMP45A-P Manufacturer : Vaisala Serial Number : W5040005 Data Sampling Interval : 10 sec Accuracy (% rel h) : 2 % rel h Aspiration : HUMICAP 180 CAPACITIVY THIN FILM POLYMER Height Diff to Ant : -0.6 m Calibration date : 2010-10-27 Effective Dates : 2011-02-08/CCYY-MM-DD Notes : The Humidity Sensor is 0.6 m : below the 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 : PTU200 Manufacturer : Vaisala Serial Number : W5110012 Data Sampling Interval : 10 sec Accuracy : 0.1 hPa Height Diff to Ant : -0.6 m Calibration date : (CCYY-MM-DD) Effective Dates : 2002-02-18/CCYY-MM-DD Notes : The Pressure Sensor is 0.6 m : below the 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 : PTU200 Manufacturer : Vaisala Oyi Serial Number : W5110012 Data Sampling Interval : 10 sec Accuracy : 0.2 deg C Aspiration : PLATINUM PROBE Height Diff to Ant : -0.5 m Calibration date : (CCYY-MM-DD) Effective Dates : 2002-02-18/2011-02-08 Notes : The Temperature Sensor is : 0.1 m below the antenna 8.3.2 Temp. Sensor Model : HMP45A-P Manufacturer : Vaisala Serial Number : W5040005 Data Sampling Interval : 10 sec Accuracy : 0.2 deg C Aspiration : RESISTIVE PLATINUM PROBE Height Diff to Ant : -0.6 m Calibration date : 2010-10-27 Effective Dates : 2011-02-08/CCYY-MM-DD Notes : The Temperature Sensor is : 0.6 m below the 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.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.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 : Department of Geodaesie Preferred Abbreviation : BKG Mailing Address : Richard-Strauss-Allee 11 : D-60598 Frankfurt a.M. : Germany Primary Contact Contact Name : GREF Operator Telephone (primary) : +49 341 5634410 Telephone (secondary) : +49 341 5634432 Fax : +49 341 5634415 E-mail : operator.gref@bkg.bund.de Secondary Contact Contact Name : BKG GNSS Data Center Telephone (primary) : +49 69 6333274 Telephone (secondary) : +49 69 63331 Fax : +49 69 6333425 E-mail : bkg-gdc@bkg.bund.de Additional Information : (multiple lines) 12. Responsible Agency (if different from 11.) Agency : (multiple lines) Preferred Abbreviation : (A10) 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) 13. More Information Primary Data Center : BKG Secondary Data Center : BEV URL for More Information : https://gref.bkg.bund.de Hardcopy on File Site Map : (Y or URL) Site Diagram : (Y or URL) Horizon Mask : (Y or URL) Monument Description : (Y or URL) Site Pictures : Y Additional Information : (multiple lines) Antenna Graphics with Dimensions Javad Positioning Systems: REGANT - SD +-------------------------+ <---------- Plastic Housing for / ------------------- \ Antenna/Choke Ring / / \ \ +---------+ | + | +---------+ <-- 0.1060 L1 | +-------------------------------------------------+ | <-- TCR / | | \ | | | | | | | | | | | | \+-----------------------------------------------------+/ |+-----------------------------------------------------+| <-- BCR \______________ | | ______________/ \ | | / \+---------x---------+/ <-- 0.0000 ARP=BPA TPSCR3_GGD --------- / + \ <-- 0.104 = L2 | + | <-- 0.081 = L1 +--------------------------------------------------+ <-- 0.071 = TCR | | | | | | | | +-----------------+-------------+------------------+ <-- 0.003 = BCR +-----x-----+ <-- 0.000 BPA=ARP <-- 0.326 --> LEIAR25.R4 +-------+ <-- 0.1995 / \ +---+-------------+---+ <-- 0.1606 TCR | | |---------------------------| |---------------------------------| |---------------------------------------| +---------------------------------------------+ | | | | +-+---------------------------------------------+-+ +-----------------+-------------+-----------------+ <-- 0.0320 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3802 --> LEIAR25.R3 +-------+ <-- 0.1995 / \ +---+-------------+---+ <-- 0.1606 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 BOP: Bottom of Pole All dimensions are in meters.