WTZT 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 : 2002-08-22 Report Type : UPDATE If Update: Previous Site Log : wtzt_20020703.log Modified/Added Sections : 4.5, 4.6 1. Site Identification of the GNSS Monument Site Name : Wettzell / Germany Four Character ID : WTZT Monument Inscription : Pillar 1201 IERS DOMES Number : 14201M011 CDP Number : Monument Description : STEEL PLATE ON CONCRETE SURVEY TOWER Height of the Monument : 0.8 Monument Foundation : SCREW ANCORED TO CONCRETE SURVEY TOWER Foundation Depth : Marker Description : STEEL REFERENCE SURVEY MARKER 1201 Date Installed : 1997-02-06T00:00Z Geologic Characteristic : Bedrock Bedrock Type : Cordirit-Silimanit-Gneiss Bedrock Condition : Weathered Fracture Spacing : 50-200 cm and over 200 cm Fault zones nearby : NO Distance/activity : (multiple lines) Additional Information : A TRIMBLE 4000SSI, Four character : ID WTZT, on pillar 1201, : Domes No. 14201M011 operates : since 1997-02-06 in the : Fundamentalstation Wettzell. : The antenna is 7.5 m above : the ground. : In addition and parallel an : AOA SNR-8000 ACT or a : ROGUE SNR-8000, Four character : WTZR, IGS Fiducial Site, on : pillar 1202, Domes No. 14201M010, : an ASHTECH Z-XII3M Metronome or : an ASHTECH Z-XII3, Four character : ID WTZA, on pillar 1204, Domes No. : 14201M013, an ASHTECH Z18 GPS+GLONASS : Receiver, Four character ID WTZZ, : on pillar 1205, Domes No. 14201M014, : and a JPS LEGACY GPS+GLONASS : Receiver, Four character ID WTZJ, : on pillar 1203, Domes No. 14201M012, : are observing. : Prior we observed here in the : Fundamentalstation Wettzell with a : TI-4100, a MiniMac 2816 AT, a Rogue : SNR-800, our # 1200, Four Character : ID WETT, Domes No. 14201M009, and a : 3SNAV R101 GPS+GLONASS Receiver, : Four character ID WTZG, on pillar : 1203, Domes No. 14201M012. : Further informations and effective : dates see sections 5 and 7. 2. Site Location Information City or Town : Koetzting State or Province : Bavaria Country : Germany Tectonic Plate : Eurasian Approximate Position (ITRF) X coordinate (m) : 4075577.523 Y coordinate (m) : 931855.364 Z coordinate (m) : 4801570.238 Latitude (N is +) : +490839.12 Longitude (E is +) : +0125244.04 Elevation (m,ellips.) : 00666.0 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : TRIMBLE 4000SSI Satellite System : GPS Serial Number : 3447A08871 Firmware Version : 7.12 Elevation Cutoff Setting : 0 Date Installed : 1997-02-06T00:00Z Date Removed : 1999-04-15T09:00Z Temperature Stabiliz. : 2.0 Additional Information : 3.2 Receiver Type : TRIMBLE 4000SSI Satellite System : GPS Serial Number : 3447A08871 Firmware Version : 7.29 Elevation Cutoff Setting : 0 Date Installed : 1999-04-15T09:00Z Date Removed : 1999-10-20T00:00Z Temperature Stabiliz. : 2.0 Additional Information : 3.3 Receiver Type : TRIMBLE 4000SSI Satellite System : GPS Serial Number : 3751A21437 Firmware Version : 7.29 Elevation Cutoff Setting : 0 Date Installed : 1999-10-20T00:00Z Date Removed : 2001-01-26T08:00Z Temperature Stabiliz. : 2.0 Additional Information : 3.4 Receiver Type : TRIMBLE 4000SSI Satellite System : GPS Serial Number : 3503A09379 Firmware Version : 7.29 Elevation Cutoff Setting : 0 Date Installed : 2001-01-26T08:00Z Date Removed : 2001-05-15T10:00Z Temperature Stabiliz. : 2.0 Additional Information : 3.5 Receiver Type : TRIMBLE 4000SSI Satellite System : GPS Serial Number : 3503A09379 Firmware Version : 7.19A Elevation Cutoff Setting : 0 Date Installed : 2001-05-15T10:00Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : 2.0 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 : TRM22020.00+GP NONE Serial Number : 0220008438 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0830 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 1997-02-06T00:00Z Date Removed : 1997-12-19T08:15Z Additional Information : 4.2 Antenna Type : TRM22020.00+GP DOME Serial Number : 0220008438 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0860 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : DOME Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 1997-12-19T08:30Z Date Removed : 1998-11-04T12:40Z Additional Information : TRIMBLE 24490-00 Prod : Assy Ext Dome 4.3 Antenna Type : TRM22020.00+GP NONE Serial Number : 0220008438 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0860 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 1998-11-04T12:40Z Date Removed : 2000-01-19T14:00Z Additional Information : 4.4 Antenna Type : TRM29659.00 NONE Serial Number : 0220181795 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0850 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 2000-01-19T14:00Z Date Removed : 2002-01-23T07:45Z Additional Information : 4.5 Antenna Type : TRM29659.00 NONE Serial Number : 0220105212 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0850 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 2002-01-23T07:45Z Date Removed : 2002-08-22T10:00Z Additional Information : Antenna calibrated absolute : by GEO++ GmbH Garbsen, 18-JAN-2002. 4.6 Antenna Type : TRM29659.00 NONE Serial Number : 0220105212 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 000.0840 Marker->ARP North Ecc(m) : 000.0000 Marker->ARP East Ecc(m) : 000.0000 Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : RG 214 Antenna Cable Length : 30 Date Installed : 2002-08-22T10:00Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : Antenna calibrated absolute : by GEO++ GmbH Garbsen, 18-JAN-2002. 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 Ref Point Tied Marker Usage : VLBI Tied Marker CDP Number : 7224 Tied Marker DOMES Number : 14201S004 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -37.731 dy (m) : -120.018 dz (m) : +59.160 Accuracy (mm) : 1 Survey method : TRIANGULATION Date Measured : 1995-02-13T15:00Z Additional Information : 5.2 Tied Marker Name : SLR WLRS Tied Marker Usage : SLR Tied Marker CDP Number : 8834 Tied Marker DOMES Number : 14201S018 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : -0.757 dy (m) : -69.820 dz (m) : +13.360 Accuracy (mm) : 1 Survey method : TRIANGULATION Date Measured : 1995-02-13T15:00Z Additional Information : 5.3 Tied Marker Name : TIGO VLBI Tied Marker Usage : VLBI Tied Marker CDP Number : 759324012 Tied Marker DOMES Number : 14201S100 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : 5.4 Tied Marker Name : TIGO SLR Tied Marker Usage : SLR Tied Marker CDP Number : 75947901 Tied Marker DOMES Number : 14201M200 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : 5.5 Tied Marker Name : 1200 ROGUE SNR-800 = WETT Tied Marker Usage : GPS Tied Marker CDP Number : Tied Marker DOMES Number : 14201M009 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : +0.966 dy (m) : -2.601 dz (m) : -0.163 Accuracy (mm) : 1 Survey method : TRIANGULATION Date Measured : 1995-02-13T15:00Z Additional Information : 5.6 Tied Marker Name : 1202 AOA SNR-8000 ACT = WTZR Tied Marker Usage : GPS Tied Marker CDP Number : Tied Marker DOMES Number : 14201M010 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : +3.071 dy (m) : -1.620 dz (m) : -2.157 Accuracy (mm) : 1 Survey method : TRIANGULATION Date Measured : 1995-02-13T15:00Z Additional Information : 5.7 Tied Marker Name : 1203 JPS LEGACY = WTZJ Tied Marker Usage : GPS+GLONASS Tied Marker CDP Number : Tied Marker DOMES Number : 14201M012 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : 5.8 Tied Marker Name : 1204 ASHTECH Z-XII3T = WTZA Tied Marker Usage : GPS Tied Marker CDP Number : Tied Marker DOMES Number : 14201M013 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : 5.9 Tied Marker Name : 1205 ASHTECH Z18 = WTZZ Tied Marker Usage : GPS+GLONASS Tied Marker CDP Number : Tied Marker DOMES Number : 14201M014 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : Survey method : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc) Date Measured : (CCYY-MM-DDThh:mmZ) Additional Information : 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 : 1997-02-06/CCYY-MM-DD Notes : 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 : SLR WLRS 8834 Status : PERMANENT Effective Dates : 1988-01-01/CCYY-MM-DD Notes : 7.2 Instrumentation Type : SLR 7834 Status : PERMANENT Effective Dates : 1977-01-01/1991-01-01 Notes : 7.3 Instrumentation Type : SLR MTLRS 1 Status : MOBILE Effective Dates : 1984-01-01/1997-01-01 Notes : 7.4 Instrumentation Type : VLBI 7224 Status : PERMANENT Effective Dates : 1983-01-01/CCYY-MM-DD Notes : 7.5 Instrumentation Type : LLR WLRS Status : PERMANENT Effective Dates : 1991-01-01/CCYY-MM-DD Notes : 7.6 Instrumentation Type : TIGO VLBI Status : PERMANENT / MOBIL Effective Dates : 1997-01-01/2001-12-01 Notes : TIGO Transportable Integrated : Geodetic Observatory 7.7 Instrumentation Type : TIGO SLR Status : PERMANENT / MOBIL Effective Dates : 1997-01-01/2001-12-01 Notes : TIGO Transportable Integrated : Geodetic Observatory 7.8 Instrumentation Type : PRARE Status : PERMANENT Effective Dates : 1994-01-01/CCYY-MM-DD Notes : 7.9 Instrumentation Type : Super Conducting Gravimeter Status : PERMANENT Effective Dates : 1989-01-01/CCYY-MM-DD Notes : 7.10 Instrumentation Type : Very Broad Band Seismograph Status : PERMANENT Effective Dates : 1991-01-01/CCYY-MM-DD Notes : 7.11 Instrumentation Type : Transit NNSS-DMA Doppler Status : PERMANENT Effective Dates : 1984-01-01/1993-01-01 Notes : 7.12 Instrumentation Type : TI-4100 GPS Status : PERMANENT Effective Dates : 1987-11-12/1989-07-27 Notes : CIGNET GPS Station 7.13 Instrumentation Type : MiniMac 2816 AT GPS Status : PERMANENT Effective Dates : 1989-05-23/1991-07-23 Notes : CIGNET GPS Station 7.14 Instrumentation Type : ROGUE SNR-800 GPS WETT # 1200 Status : PERMANENT Effective Dates : 1991-07-23/1997-02-02 Notes : CIGNET / CORE / IGS Station 7.15 Instrumentation Type : AOA SNR-8000 ACT GPS WTZR # 1202 Status : PERMANENT Effective Dates : 1995-02-09/CCYY-MM-DD Notes : IGS Fiducial Station 7.16 Instrumentation Type : 3SNAV R101 OLD GPS+GLONASS WTZG # 1203 Status : PERMANENT Effective Dates : 1998-10-14/1999-09-04 Notes : 7.17 Instrumentation Type : ASHTECH Z-XII3T GPS WTZA # 1204 Status : PERMANENT Effective Dates : 1997-11-25/CCYY-MM-DD Notes : 7.18 Instrumentation Type : ASHTECH Z18 GPS+GLONASS WTZZ # 1205 Status : PERMANENT Effective Dates : 1999-02-01/CCYY-MM-DD Notes : 7.19 Instrumentation Type : JPS LEGACY GPS+GLONASS WTZJ # 1203 Status : PERMANENT Effective Dates : 2001-07-03/CCYY-MM-DD Notes : 7.20 Instrumentation Type : Ringlaser - Gyroscope Status : PERMANENT Effective Dates : 2001-09-01/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 8.1.1 Humidity Sensor Model : 809 Manufacturer : Lamprecht, Goettingen Serial Number : Data Sampling Interval : 900 Accuracy (% rel h) : 1.5 Aspiration : PERNIX element Height Diff to Ant : 0 Calibration date : (CCYY-MM-DD) Effective Dates : 1987-01-01/CCYY-MM-DD Notes : Meteorological data Site WTZR 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 : DIGIQUARZ MODEL 740 Manufacturer : Parascientific Inc. Serial Number : Data Sampling Interval : 900 Accuracy : 0.1 Height Diff to Ant : 10.5 Calibration date : (CCYY-MM-DD) Effective Dates : 1987-01-01/CCYY-MM-DD Notes : Meteorological data Site WTZR. : The Pressure Sensor is : 10.5 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 : 809 Manufacturer : Lamprecht, Goettingen Serial Number : Data Sampling Interval : 900 Accuracy : 0.3 Aspiration : PLATINUM PROBE Height Diff to Ant : 0 Calibration date : (CCYY-MM-DD) Effective Dates : 1987-01-01/CCYY-MM-DD Notes : Meteorological data Site WTZR 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) 8.4.1 Water Vapor Radiometer : CTGR129502 Manufacturer : Captec, Bern / ETH, Zuerich Serial Number : Distance to Antenna : 27 Height Diff to Ant : 1 Calibration date : (CCYY-MM-DD) Effective Dates : 1997-04-01/CCYY-MM-DD Notes : 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) 8.5.1 Other Instrumentation : 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 : Fundamentalstation Wettzell Preferred Abbreviation : BKG Mailing Address : Bundesamt fuer Kartographie : und Geodaesie : Fundamentalstation Wettzell : D-93444 Koetzting : Germany Primary Contact Contact Name : Dr. Wolfgang Schlueter Telephone (primary) : (0049)-9941-603107 Telephone (secondary) : (0049)-9941-6030 Fax : (0049)-9941-603222 E-mail : schlueter@wettzell.ifag.de Secondary Contact Contact Name : Rudi Stoeger Telephone (primary) : (0049)-9941-603114 Telephone (secondary) : (0049)-9941-6030 Fax : (0049)-9941-603222 E-mail : schlueter@wettzell.ifag.de Additional Information : Klaus Roettcher : (0049-9941-603115) : roettcher@wettzell.ifag.de : Uwe Hessels : (0049)-9941-603204 : hessels@wettzell.ifag.de 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 : IGN URL for More Information : www.ifag.de, www.wettzell.ifag.de Hardcopy on File Site Map : (Y or URL) Site Diagram : Y Horizon Mask : Y Monument Description : Y Site Pictures : Y Additional Information : (multiple lines) Antenna Graphics with Dimensions TRM22020.00+GP From 1997-02-06 until 1997-12-19 without DOME From 1997-12-19 until 1998-11-04 with TRIMBLE 24490-00 Prod Assy Ext DOME From 1998-11-04 until 2000-01-19 without DOME ----+---- <-- 0.0751 L1 / + \ <-- 0.0692 L2 ++----------------+-----------------+-----------------++ <-- 0.0591 TGP ++---------------+-------------------+----------------++ <-- 0.0556 BGP | | | | | | +------x------+ <-- 0.000 ARP=BPA <-- 0.467 --> NOTCHES <-- 0.483 --> EDGE TRM29659.00 From 2000-01-19 ----- / + \ <-- 0.128 L2 | + | <-- 0.110 L1 +--------------------------------------------------+ <-- 0.102 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | =| | +------x------+ <-- 0.000 BPA=ARP <-- 0.381 --> 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