AMCT00USA 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) : Bill Bollwerk, Jim Ray (USNO) Date Prepared : 2025-11-07 Report Type : UPDATE If Update: Previous Site Log : amct_19980401.log Modified/Added Sections : 1. Site Identification of the GNSS Monument Site Name : Alternate Master Clock (timing test) Nine Character ID : AMCT00USA Monument Inscription : IERS DOMES Number : 40472S003 CDP Number : none Monument Description : no monument, GPS antenna ARP Height of the Monument : Monument Foundation : ROOF Foundation Depth : Marker Description : Date Installed : 1998-03-24T00:00Z Geologic Characteristic : Bedrock Type : Bedrock Condition : Fracture Spacing : Fault zones nearby : Distance/activity : Additional Information : The antenna is mounted on top of the roof : (flat) of Building 400 (5 stories) at Falcon : Air Force Base, outside of Colorado Springs, : Colorado. There are no nearby geodetic markers : or control points. 2. Site Location Information City or Town : Falcon Air Force Base, Colorado Springs State or Province : Colorado Country or Region : USA Tectonic Plate : NORTH AMERICAN Approximate Position (ITRF) X coordinate (m) : -1248596.2410 Y coordinate (m) : -4819429.5890 Z coordinate (m) : 3976506.9870 Latitude (N is +) : +384811.24 Longitude (E is +) : -1043128.52 Elevation (m) : 1913.1 Additional Information : 3. GNSS Receiver Information 3.1 Receiver Type : ROGUE SNR-12 Satellite System : GPS Serial Number : T247 Firmware Version : 3.2.32.1 Elevation Cutoff Setting : Date Installed : 1998-03-24T00:00Z Date Removed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : 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 NONE Serial Number : 308 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 : Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Antenna Cable Length : Date Installed : 1998-03-24T00:00Z Date Removed : (CCYY-MM-DDThh:mmZ) Additional Information : This antenna is located 28.5 inches nearly : directly north of the antenna for a TTR-4P : timing receiver. NIMA surveyed the TTR-4P : antenna location in August 1996 with the : following results: : 38 Degrees 48' 11.1860" N ( 38.803107222 N) : 104 Degrees 31' 28.5435" W (255.475404583 E) : 1911.087 m Ellipsoid Height : with a stated accuracy of +/- 30 cm (1 sigma) : in each component. The TurboRogue antenna : is mounted at the same height level on the : same T-bar as the TTR-4P antenna. : ** 2023-03-31 SLM 2.0 altered field alignment : from its original value: oriented North but not : measured 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 : EXTERNAL STEERED H-MASER Input Frequency : Effective Dates : 1998-03-24/CCYY-MM-DD Notes : reference signal from USNO Alternate Master : Clock #1, the back-up realization of UTC(USNO) : via two-way satellite time transfer; : calibration of clock offset to be established : later 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.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) 8.5.1 Other Instrumentation : The USNO Alternate Master Clock is located in : the same building as this GPS receiver. The : differential time offset between the Alternate : Master Clock and the GPS antenna will be : monitored and may be used to calibrate the : receiver clock time directly to UTC(AMC). 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 : U.S. Naval Observatory, Alternate Master Clock Preferred Abbreviation : USNO/AMC Mailing Address : 400 O'Malley Ave, Suite 44 : Falcon AFB, CO 80912-4044 Primary Contact Contact Name : Bill Bollwerk Telephone (primary) : 719-567-6740 Telephone (secondary) : 719-567-6763 Fax : E-mail : bill@tycho.usnogps.navy.mil Secondary Contact Contact Name : Paul Wheeler (USNO) Telephone (primary) : 202-762-1581 Telephone (secondary) : Fax : E-mail : paul@tsee2.usno.navy.mil Additional Information : 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 : NGS Secondary Data Center : unknown URL for More Information : Hardcopy on File Site Map : N Site Diagram : N Horizon Mask : N) Monument Description : no monument Site Pictures : N Additional Information : Regional Data Center Contact: : Linda Nussear (NOAA) : 301-713-2852 (phone) : 301-713-4475 (fax) : linda@gracie.grdl.noaa.gov Antenna Graphics with Dimensions TurboRogue: DORNE MARGOLIN T ----- / + \ <-- 0.128 L2 | + | <-- 0.110 L1 +--------------------------------------------------+ <-- 0.102 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.038 +-------------------+-------------+--------------------+ <-- 0.035 BCR | | =| | +------x------+ <-- 0.000 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