Network Station Configuration File International VLBI Service Refer to the instructions in the file ftp://ivscc.gsfc.nasa.gov/config/instructions.txt for how to fill out and submit this form. 990624 nrv Form version 0.5 990702 nrv Form version 0.6 990713 nrv Form version 0.7 991020 nrv Form version 0.8 0. Form Prepared by (full name) : Michael A. Poirier Date prepared : 2000-04-15 Report type : new 1. Site identification Site name : Westford Antenna Site Site 8-letter code : WESTFORD Site 2-letter code(s) : Wf IERS DOMES number : 40440S003 CDP occupation code : 72097301 CDP monument number : 41 Surveyed into national network? : yes IGS station code : WES2 ILRS station name : Additional information : 2. Site information 2.1 Site location information City or Town : Westford State or Province : Massachusetts Country : U.S.A. Tectonic plate : North American Approximate position X coordinate (m) : 1492206.5970 Y coordinate (m) :-4458130.5170 Z coordinate (m) : 4296015.5320 Latitude (deg) : 42.613 N Longitude (deg) : 71.494 W Elevation (m) : 87.77 Source of position : GPS Additional information : 2.2 Site local survey network information Number of reference markers : 3 Type of marker : Ground Marker, Brass Disc Frequency of surveying : Surveying method : directions, distances, levelling, and GPS Survey instruments used : theodolite, EDM, and GPS receivers Accuracy : +/- 2 mm Survey performed by : Allied Signal Technical Service Corp Survey documentation : ATSC February 1997 report Most recent survey date : 1999-03-26 Results provided to IERS: Yes Results provided to CDDIS: Yes Person responsible : Jim Long, ATSC Additional information : 2.3 Site descriptive information Electronic file available at IVSCC: (Please upload these files to ftp://ivscc.gsfc.nasa.gov/incoming and send e-mail to ivscc@ivscc.gsfc.nasa.gov telling the names.) ns is for Network Stations (don't change) Xy is station 2-letter code sm, sd, hm, md, sp indicate the type of file (don't change) NN are numbers, 01 is the first such file, 02 the second, etc. .type is the file type, .ps for PostScript, .jpg for JPEG, etc. Site map : nsXysmNN.type Site diagram : nsXysmNN.type Horizon mask diagram : nsXysmNN.type Monument description : nsXysmNN.type Site photographs : nsXysmNN.type URLs for reference Site map : Site diagram : Horizon mask : Monument description : Site photographs : Additional information : 3. Antenna information Diameter (m) : 18.3 Axis type : AZEL Axis offset (m) : 0.318 Slew rate first axis : 200 Slew rate second axis : 120 Limit stops first axis : 90,470 Limit stops second axis : 88,4 Horizon mask data : 0 5/15 5/16 6/25 6/26 8/60 8/61 5/ 75 5/76 6.5/85 6.5/86 5/95 5/96 6.5/ 105 6.5/106 5/115 5/116 4/360 4 Occupation dates : 1981-04-17 to present (VLBI use) Additional information : Antenna constructed mid-1961 for Project WEST FORD by Lincoln Laboratory 4. Receiver information Feed location : prime focus Feed type : NASA/CDP prime-focus X 1st-stage amplifier : cooled HEMT X bandwidth (MHz) : 800 X Tsys at zenith (K) : 50 X SEFD (Jy) : 1400 X aperture efficiency : 0.40 X LO frequencies (MHz) : 8080 S 1st-stage amplifier : cooled HEMT S bandwidth (MHz) : 240 S Tsys at zenith (K) : 70 S SEFD (Jy) : 1400 S aperture efficiency : 0.55 S LO frequencies (MHz) : 2020 Phase calibrator type : NASA/CDP with 5 MHz input and temperature controller Additional information : 5. Cables between receiver and back end Length of cable run : 75 m X band cable type : RG214 X band freq. bandpass : 100-900 MHz S band cable type : RG214 S band freq. bandpass : 190-430 MHz LO ref signal cable type: RG214 LO ref signal freq. : 5 MHz Phase cal ref signal cable type: RG214 Phase cal ref signal freq. : 5 MHz Cable meas. system type : MarkIII cable cal Additional information : 6. Data acquisition system information 6.1 Video/baseband converter set (group each set of up to 16 mixers with similar characteristics) Type of converters : MarkIV Number of mixers : 14 Sidebands available : U&L Number of mixers with the following filters in all sideband outputs: 2 MHz : 14 4 MHz : 14 8 MHz : 14 16 MHz : 14 32 MHz : 0 Additional information : 6.1.x (add sections for each additional video/baseband converter set) 6.2 Formatter Formatter type : MarkIV Serial number or rack ID: 07 rack ID Additional information : 6.2.x (add sections for each additional formatter) 6.3 Decoder Decode type : MarkIV Additional information : SN 0919 6.3.x (add sections for each additional decoder) 6.4 IF distribution IF distributor type : MarkIII/IV+IF3 Additional information : 6.4.x (add sections for each additional IF distribution) 6.5 Up/down converters X up/down converter freq.: 500.1 MHz down (IF3) S up/down converter freq.: Additional information : 6.5.x (add sections for each additional converter) 6.6 Other rack equipment : Additional information : 6.6.x (add lines or sections for other types of rack equipment) 6.7 Recorders Recorder type : MarkIV Number of recorders : 1 Tape type : thin Additional information : 6.7.x (add sections for each recorder type) 6.8 Data Acquisition System Configuration Types Supported (list only those that are actually usable) 6.8.1 Configuration 1 : (list elements from section 6 that : make a usable configuration) : : 6.1.1 14 MarkIV video converters : 6.2 MarkIV formatter : 6.3 MarkIV decoder : 6.4 MarkIII/IV+IF3 : 6.5 X-Band 500.1 MHz downconverter : 6.7 MarkIV recorder 6.8.x (list additional configurations) 7 Meteorological instrumentation 7.1 Humidity sensor Manufacturer : Vaisala Model : hmp233b1b02de12c1a Accuracy : Effective dates : 1998-10 to present Additional information : NOAA supplied instruments. Data available on cddisa.gsfc.nasa.gov/ pub/gps/gpsdata/00170/met 7.2 Pressure sensor Manufacturer : Vaisala Model : ptb220aab1a1 Accuracy : Effective dates : 1998-10 to present Height relative to VLBI : Additional information : same as above 7.3 Temperature sensor Manufacturer : Vaisala Model : hmp233b1b02de12c1a Accuracy : Effective dates : 1998-10 to present Additional information : same as above 8. Time and frequency standards 8.1 Standard type : H-maser Installed dates : 1990-06-06 to 2000-02-10 /2000-02-10 to present Manufacturer : APL/APL (NASA) Model number or ID : NR3/NR4 Additional information : 8.x (add more sections for each standard) 9. Auxilliary equipment information Type of equipment : GPS timing receiver Installed dates : 1999-09-14 to present Manufacturer : CNS Clock (TAC) Model number or ID : SN 801038 Additional information : PC for CNS clock tied into NR4 Maser for additional timing data. Connected to network for auto downloads of data. 9.x (add sections for additional auxilliary equipment) 10. Co-location information 10.1 Instrument type : GPS Instrument name : turbo rouge Status : Permanent Effective dates : 1993-02-08 to present Included in local survey: yes Additional information : 10.x (add sections for each type) 11. Field System computer information System vendor : SWT CPU : PII CPU speed : 200 MHz Memory : 64 Mbytes sdram Disk : (2) 4.3 Gbytes Linux release : 9.4.12 Internet connection : Direct Antenna interface type : RS-232 Serial Spare FS computer? : no 12. Known RFI sources 12.1 Center frequency : 2220 MHz (5th harmonic of 440 MHz radar from antenna 750 m distant) Approximate bandwidth : 10 MHz Approximate az/el range : All Additional informaiton : RFI level is up to 20% of Tsys in band, depending on direction; radar is in operation roughly 10% of the time. 12.x (add sections for multiple RFI sources and frequencies) 13. On-site contact information Agency : MIT Haystack Observatory Shipping address : Westford Antenna Site Bldg. 4 Postal address : Off Route 40, Westford, MA 01886 URL of site web page : www.haystack.mit.edu On-site Friend of VLBI Name : Michael A. Poirier Telephone (primary) : 781-981-5554 Telephone (alternate) : 781-981-5556 Fax : 781-981-0515 E-mail : map@haystack.mit.edu On-site VLBI operations room Telephone (primary) : 781-981-5554 Telephone (alternate) : 781-981-5556 Fax : 781-981-0515 E-mail : Other on-site contact Name : Brian Corey Telephone (primary) : 781-981-5417 Telephone (alternate) : 781-981-5407 Fax : 781-981-0590 E-mail : bec@haystack.mit.edu Additional information : 14. Responsible agency (if different from on-site information) Agency : NASA Shipping address : Code 920.1, Building 33, Room G224 Postal address : Goddard Space Flight Center, Greenbelt, MD URL of agency web page : lupus.gsfc.nasa.gov Primary administrative agency contact: Contact person : William Wildes Telephone (primary) : 301-614-5967 Telephone (alternate) : Fax : 301-614-5970 E-mail : wtw@wildbill.gsfc.nasa.gov Alternate agency contact Contact person : John Bosworth Telephone (primary) : 301-614-5969 Telephone (alternate) : Fax : 301-614-5970 E-mail : jmb@ltpmail.gsfc.nasa.gov Additional information : 15. More information Additional information :