========================================================================= Information on NTP Time Servers and Radio Timecode Receivers = = This update 31 March 1991, last version 1 February 1990 = ======================================================================== General Information This file is provided for information purposes only and represents the best information available at the date posted above. It does not represent a committment to provide connectivity or time service on the part of the operators involved. Further information of a technical nature can be obtained from the ntp@trantor.umd.edu list. To subscribe to this list, contact ntp-request@trantor.umd.edu (Louie Mamakos). Alternatively, if possible, please subscribe to the USENET newsgroup comp.protocols.time.ntp which is gatewayed to the mailing list. Time Servers Following is a list of NTP primary and secondary time servers known to be connected to the Internet and may be available for external access. Each entry gives the host name, Internet address, approximate location and geographic coordinates if available, synchronization source (stratum, type of radio or satellite receiver and host type), suggested service area, access policy (as notified) and contact name and e-mail address. When more than one address is given, preference should given to each in order. All servers are equipped with uncompensated crystal- stabilized timebases, unless indicated otherwise. The contact person should always be notified upon establishment of regular operations with servers listed as open access. Note: * indicates change since the previous version of this file. Primary Servers --------------- apple.com (130.43.2.2) Location: Apple Computer, Cupertino, CA Synchronization: NTP primary (WWV clock), VAX/Unix Service area: NSFNET, BARR region, CSNET Access policy: open access Contact: Erik Fair (timekeeper@apple.com) bitsy.mit.edu (18.72.0.3) Location: MIT Information Systems, Cambridge, MA Synchronization: NTP primary (WWV clock), VAX/Unix Service area: NSFNET, NEARnet area Access policy: open access Contact: Jeff Schiller (jis@mit.edu) clepsydra.dec.com (16.1.0.4) Location: DEC Western Research Laboratory, Palo Alto, CA Synchronization: NTP primary (GOES clock), Fuzzball Service area: NSFNET, BARR region Access policy: open access Contact: Jeff Mogul (mogul@decwrl.dec.com) clock.osf.org (130.105.1.156) Location: Open Software Foundation, Boston, MA Synchronization: NTP primary (WWV clock), PMAX/Unix Service area: NSFNET, NEARnet region Access policy: open access Contact: Marcus Antonius Romanus (marcus@osf.org) Note: prior permission to access required dcn1.udel.edu (128.4.0.1)Location: University of Delaware, Newark, DE Geographic Coordinates: 39:40:49N, 75:45:6W (USGS map NAD27) Synchronization: NTP primary (WWVB clock), Fuzzball (cesium timebase) Service area: NSFNET, SURA region Access policy: open access Contact: Dave Mills (mills@udel.edu) Note: shares access with dcn5.udel.edu to a single WWVB clock dcn5.udel.edu (128.4.0.5) Location: University of Delaware, Newark, DE Geographic Coordinates: 39:40:49N, 75:45:6W (USGS map NAD27) Synchronization: NTP primary (WWVB clock), Fuzzball (OCXO timebase) Service area: NSFNET, SURA region Access policy: open access Contact: Dave Mills (mills@udel.edu) Note: shares access with dcn1.udel.edu to a single WWVB clock dcn6.udel.edu (128.4.0.6) Location: Backroom Test Facility, Newark, DE Geographic Coordinates: 39:42:0N, 75:46:55W (USGS map NAD27) Synchronization: NTP primary (WWV clock), Fuzzball (OCXO timebase) Service area: NSFNET, SURA region Access policy: development test only; not for regular access Contact: Dave Mills (mills@udel.edu) flash.bellcore.com (128.96.32.20) Location: Bell Communications Research, Morristown NJ Synchronization: NTP primary (WWVB clock), VAX/Unix Service area: JvNCnet Access policy: open access Contact: Nat Howard (timekeeper@bellcore.com) fordgw.srl.ford.com (128.5.192.1) Location: Ford Scientific Research Laboratory, Dearborn, MI Synchronization: NTP primary (GOES clock), Fuzzball Service area: NSFNET, MERIT region Access policy: closed access; for use only by prior arrangement Contact: Fred Ball (fball@smail.srl.ford.com) fuzz.sdsc.edu (132.249.16.1) Geographic Coordinates: 32:53:7N, 117:14:20W Location: SDSC Supercomputer Center, San Diego, CA Synchronization: NTP primary (WWVB clock), Fuzzball Service area: NSFNET, SDSC region Access policy: open access Contact: Gerard K. Newman (gkn@sds.sdsc.edu) hermes.chpc.utexas.edu (129.116.3.3) Location: UT SYSTEM CHPC, Austin, TX Synchronization: NTP primary (WWV clock), Convex/Unix Service area: NSFNET, THENET region Access policy: open access Contact: William L. Jones (jones@chpc.utexas.edu) hp850.mbari.org (134.89.2.200) Location: Monterey Bay Aquarium Research Institute, Pacific Grove, CA Synchronization: NTP primary (WWV clock), HP/Unix Service area: NSFNET, BARR region Access policy: closed access; for use only by prior arrangement Contact: Bob Herlien (hebo@hp850.mbari.org) ncarfuzz.ucar.edu (192.43.244.9)Location: NCAR Supercomputer Center, Boulder, CO Synchronization: NTP primary (WWVB clock), Fuzzball Service area: NSFNET, USAN region Access policy: open access Contact: Don Morris (morris@windom.ucar.edu) norad.arc.nasa.gov (192.52.195.10, 128.102.16.10) Location: NASA Ames Research Center, Moffett Field, CA Synchronization: NTP primary (WWV clock), Sun/Unix Service area: NSFNET, BARR region, NASA NSN, DOE ESNET, DDN Access policy: open access Contact: Milo Medin (medin@nsipo.arc.nasa.gov) ntps1-0.informatik.uni-erlangen.de (131.188.1.10 - subject to change USE DNS) Location: University Erlangen-Nuernberg, D-W8520 Erlangen, FRG Synchronization: NTP primary (DCF77 clock), Sun/Unix Service area: Germany/Europe Access policy: open access Contact: Frank Kardel, Rainer Pruy (time@informatik.uni-erlangen.de) otc1.psu.edu (128.118.46.3) Location: Penn State University, University Park, PA Synchronization: NTP primary (WWV clock), Sun/Unix Service area: NSFNET, PREPNET, JvNCnet Access policy: open access Contact: John Balogh (jdb@ecl.psu.edu) suzuki.ccie.utoronto.ca (128.100.49.105) Location: University of Toronto, Toronto, Ontario, Canada Synchronization: NTP primary (CHU clock), 68000 special Service area: Canada and nearby areas Access policy: open access Contact: Dennis Ferguson (dennis@gw.cice.utornoto.ca) umd1.umd.edu (128.8.10.1) Location: University of Maryland, College Park, MD Synchronization: NTP primary (WWVB clock), Fuzzball Service area: NSFNET, SURA region Access policy: open access Contact: Louie Mamakos (louie@trantor.umd.edu) timer.nta.no (128.39.1.149) Location: The Research Department of the Norwegian Telecommunications Administration (NTA-RD), Kjeller, Norway Synchronization: NTP primary, (NTP clock), Fuzzball (LORAN-C timebase) Service area: Norway Access policy: closed access; for use only by prior arrangement Contact: Terje Hammer (ham@tor.nta.no) timer.unik.no (128.39.10.149) Location: UNIK (University Department at Kjeller), Kjeller, Norway Synchronization: NTP primary, (NTP clock), Fuzzball (cecium timebase) Service area: Norway Access policy: open access Contact: Paal Spilling (paal@tor.nta.no) truechimer.cso.uiuc.edu (130.126.174.40) Location: University of Illinois, Champaign, IL Synchronization: NTP primary (WWVB clock), Fuzzball Service area: CICNET, NSFNET, NCSA region Access policy: open access, please send a message to notify. Contact: Paul Pomes (paul-pomes@uiuc.edu)Note: If BBN ever returns our 11/73 hardware, timelord will be built. vecrhc1.hpl.hp.com (15.255.60.3) Location: Hewlett-Packard Laboratorites, Bristol, UK Synchronization: NTP primary (MSF clock), HP/Unix Service area: HP corporate Access policy: closed access; for use only by prior arrangement Contact: Robert Cole (rhc@hplb.hp.com) wwvb.isi.edu (128.9.2.129) Location: USC Information Sciences Institute, Marina del Rey, CA Geographic Coordinates: 33:58:49N, 118:26:20W (USGS map NAD27) Synchronization: NTP primary (WWVB clock), Fuzzball Service area: NSFNET, Los Nettos region Access policy: open access Contact: Steve Casner (casner@isi.edu) wwvb.erg.sri.com (128.18.{3,4,5,6,200}.39) Location: SRI International, Menlo Park, CA Synchronization: NTP primary (WWVB clock) Sun/Unix Service area: NSFNET, BARR Region Access policy: open access Contact: Dave Curry (davy@erg.sri.com) Note: wwvb.erg.sri.com is a CNAME for (presently) sparkyfs.erg.sri.com Secondary Servers ----------------- augean.ua.oz.au (129.127.4.2) Location: University of Adelaide, South Australia Synchronization: NTP secondary (stratum 2), Vax-11/780/Unix Service area: AARNet Access policy: open access Contact: Tarmo Rohtla (tarmo@augean.ua.oz.au) clock.psu.edu (128.118.25.3) Location: Penn State University, University Park, PA Synchronization: NTP secondary (stratum 2), Sun/Unix Service area: PREPNET, JvNCnet, PSC region Access policy: open access Contact: John Balogh (jdb@ecl.psu.edu) * fartein.ifi.uio.no (129.240.102.2) Location: University of Oslo, Norway Geographic Coordinates: 59:56:32N, 10:43:22E Synchronization: NTP secondary (stratum 2), VAXstation/Ultrix Service area: NORDUnet Access policy: open access Contact: Anders Ellefsrud, Ole Bjorn Hessen (timekeeper@ifi.uio.no) Note: Other stratum 2 servers in the Oslo area available on request fuzz.psc.edu (192.5.146.42) Location: PSC Supercomputer Center, Pittsburgh, PA Synchronization: NTP secondary (stratum 2), Fuzzball Service area: NSFNET, PSC region Access policy: open access Contact: Eugene Hastings (hastings@morgul.psc.edu) fuzz.sura.net (192.80.214.42) Location: SURA Consortium, College Park, MD Synchronization: NTP secondary (stratum 2), Fuzzball Service area: NSFNET, SURA region Access policy: open access Contact: Dave O'Leary (oleary@umd5.umd.edu)Note: formerly known as clock.umd.edu (192.41.177.92) gazette.bcm.tmc.edu (128.249.2.2) Location: Baylor College of Medicine, Houston, Tx Synchronization: NTP secondary (stratum 2), Solbourne-OS/MP 4.0C Service area: NSFNET, SESQUI region Access policy: open access Contact: Stan Barber (sob@tmc.edu) george.jpl.nasa.gov (128.149.2.1) Location: Jet Propulsion Laboratory, Pasadena, CA Synchronization: NTP secondary (stratum 2), Sun/SunOS 4.1 Service area: NSFNET, Los Nettos region, NASA NSN Access policy: open access Contact: Steve Groom (stevo@elroy.jpl.nasa.gov) Note: select one of (george.jpl.nasa.gov, jane.jpl.nasa.gov) to equalize load gus.ecn.purdue.edu (128.46.129.79) Location: Purdue University Engineering Computer Network, West Lafayette, IN Synchronization: NTP secondary (stratum 2), Sun/Unix Service area: NSFNET, CICNET area Access policy: open access Contact: Jeff Schwab (jrs@ecn.purdue.edu) gw1.cs.ucla.edu (131.179.128.2) Location: UCLA Computer Science Department, Los Angeles, CA Geographic Coordinates: 34:04:08N, 118:26:31W Synchronization: NTP secondary (stratum 2), RT/Unix Service area: NSFNET, SDSC region Access policy: open access Contact: Rich Wales (wales@cs.ucla.edu) Note: select one of (gw1.cs.ucla.edu, gw2.cs.ucla.edu) to equalize load gw2.cs.ucla.edu (131.179.128.3) Location: UCLA Computer Science Department, Los Angeles, CA Geographic Coordinates: 34:04:08N, 118:26:31W Synchronization: NTP secondary (stratum 2), RT/Unix Service area: NSFNET, SDSC region Access policy: open access Contact: Rich Wales (wales@cs.ucla.edu) Note: select one of (gw1.cs.ucla.edu, gw2.cs.ucla.edu) to equalize load iis.ethz.ch (129.132.2.60) Location: Swiss Fed. Inst. of Technology, CH 8092 Zurich, Switzerland Geographic Coordinates: 47:23N, 8:32E Synchronization: NTP secondary (stratum 2), DS5400/Unix Service area: Switzerland/Europe Access policy: open access Contact: Peter Lamb (prl@iis.ethz.ch) jane.jpl.nasa.gov (128.149.2.7) Location: Jet Propulsion Laboratory, Pasadena, CA Synchronization: NTP secondary (stratum 2), Sun/SunOS 4.1 Service area: NSFNET, Los Nettos region, NASA NSN Access policy: open access Contact: Steve Groom (stevo@elroy.jpl.nasa.gov) Note: select one of (george.jpl.nasa.gov, jane.jpl.nasa.gov) to equalize load larry.mcrcim.mcgill.edu (132.206.1.1) Location: McGill RCIM, Montreal, QC, Canada Synchronization: NTP secondary (stratum 2), VAX-11/750/4.3BSDService area: CAnet, RISQ region Access policy: open access Contact: Mike Parker (mouse@larry.mcrcim.mcgill.edu) libra.rice.edu (128.42.1.64) Location: Rice University, Houston, TX Synchronization: NTP secondary (stratum 2), Fuzzball Service area: NSFNET, SESQUI region Access policy: open access Contact: Farrell Gerbode (gerbode@rice.edu) lilben.tn.cornell.edu (192.35.82.50) Location: Cornell University, Ithaca, NY Synchronization: NTP secondary (stratum 2), Fuzzball Service area: NSFNET, NYSER region Access policy: open access Contact: Scott Brim (swb@devvax.tn.cornell.edu) louie.udel.edu (128.175.1.3) Location: University of Delaware, Newark, DE Synchronization: NTP secondary (stratum 2), Vax-11/780/Unix Service area: NSFNET, SURA region Access policy: open access Contact: Dave Mills (mills@udel.edu) meevax.meediv.lanl.gov (192.52.70.2) Location: Los Alamos National Laboratory - Los Alamos, NM Synchronization: NTP secondary (stratum 2), VAX 6320/VMS Service area: ESNET, TECHNET area Access policy: open access Contact: Jim A. Whitfill whitfill@meediv.lanl.gov molecules.ecn.purdue.edu (128.46.129.82) Location: Purdue University Engineering Computer Network, West Lafayette, IN Synchronization: NTP secondary (stratum 2), Sun/Unix Service area: NSFNET, CICNET area Access policy: open access Contact: Jeff Schwab (jrs@ecn.purdue.edu) ncnoc.concert.net (128.109.193.1) Location: CONCERT Network NOC, Research Triangle Park, NC Synchronization: NTP secondary (stratum 2), Sun 4/65/Unix/xntp Service area: NSFNET, CONCERT region Access policy: open access Contact: Joe Ragland (jrr@concert.net) ntps2-0.informatik.uni-erlangen.de (131.188.1.45 - subject to change USE DNS) Location: University Erlangen-Nuernberg, D-W8520 Erlangen, FRG Synchronization: NTP secondary (stratum 2), Sun/Unix Service area: Germany/Europe Access policy: relatively open access (would be kind if you would ask) Contact: Frank Kardel, Rainer Pruy (time@informatik.uni-erlangen.de) ntp-0.cso.uiuc.edu (128.174.5.50) Location: Champaign, IL Synchronization: NTP secondary (stratum 2), VAX-3500/Unix Service area: CICNET, NSFNET, NCSA region Access policy: open access, please send a message to notify. Contact: Paul Pomes (paul-pomes@uiuc.edu) Note: select one of (ntp-0.cso.uiuc.edu, ntp-0.cso.uiuc.edu, ntp- 2.cso.uiuc.edu) to equalize loadNote: consult DNS to verify CNAME ntp-0.cso.uiuc.edu ntp-1.cso.uiuc.edu (128.174.5.3) Location: Champaign, IL Synchronization: NTP secondary (stratum 2), RS6000/540 Service area: CICNET, NSFNET, NCSA region Access policy: open access, please send a message to notify. Contact: Paul Pomes (paul-pomes@uiuc.edu) Note: select one of (ntp-0.cso.uiuc.edu, ntp-0.cso.uiuc.edu, ntp- 2.cso.uiuc.edu) to equalize load Note: consult DNS to verify CNAME ntp-1.cso.uiuc.edu ntp-2.cso.uiuc.edu (128.174.5.58) Location: Champaign, IL Synchronization: NTP secondary (stratum 2), VAX-3500/Unix Service area: CICNET, NSFNET, NCSA region Access policy: open access, please send a message to notify. Contact: Paul Pomes (paul-pomes@uiuc.edu) Note: select one of (ntp-0.cso.uiuc.edu, ntp-0.cso.uiuc.edu, ntp- 2.cso.uiuc.edu) to equalize load Note: consult DNS to verify CNAME ntp-2.cso.uiuc.edu polaris.llnl.gov (128.115.14.19) Location: Lawrence Livermore National Laboratory, Livermore, CA Synchronization: NTP secondary (stratum 2), Sun 3/60 Service area: BARRNet, ESNet Access policy: open access Contact: Joe Carlson (carlson@lll-winken.llnl.gov) powvax.meediv.lanl.gov (192.52.70.3) Location: Los Alamos National Laboratory, Los Alamos, NM Synchronization: NTP secondary (stratum 2), VAX 11/785/VMS Service area: ESNET, TECHNET area Access policy: open access Contact: Jim A. Whitfill whitfill@meediv.lanl.gov sirius.ucs.adelaide.edu.au (129.127.40.3) Location: University of Adelaide, South Australia Synchronization: NTP secondary (stratum 2), Sun-4/260S/Unix Service area: AARNet Access policy: open access Contact: Mark Prior (mrp@ucs.adelaide.edu.au) tick.cs.unlv.edu (131.216.16.9) Location: UNLV Computer Science Department, Las Vegas, NV Synchronization: NTP secondary (stratum 2), VAX/Unix Service area: NSFNET, SDSC region Access policy: open access Contact: Greg Wohletz Note: select one of (tick.cs.unlv.edu, tock.cs.unlv.edu) to equalize load Note: tick.cs.unlv.edu is a CNAME for (currently) elmore.cs.unlv.edu tmc.edu (128.249.1.1) Location: Baylor College of Medicine, Houston, Tx Synchronization: NTP secondary (stratum 2), Sun/SunOS 4.1 Service area: NSFNET, SESQUI region Access policy: open access Contact: Stan Barber (sob@tmc.edu) tock.cs.unlv.edu (131.216.18.4) Location: UNLV Computer Science Department, Las Vegas, NV Synchronization: NTP secondary (stratum 2), VAX/Unix Service area: NSFNET, SDSC regionAccess policy: open access Contact: Greg Wohletz Note: select one of (tick.cs.unlv.edu, tock.cs.unlv.edu) to equalize load Note: tock.cs.unlv.edu is a CNAME for (currently) little- walter.cs.unlv.edu * yoyo.aarnet.edu.au (129.127.40.4) Location: The University of Adelaide, Adelaide, South AUSTRALIA Synchronization: NTP secondary (stratum 2), Sun-3/60/Unix Service Area: AARNet Access policy: open access Contact: Mark Prior Other Servers (Fuzzball) ------------------------ dcn2.udel.edu (128.4.0.2) Location: University of Delaware, Newark, DE Synchronization: local net (stratum 2), Fuzzball Service area: closed access; sevice limited to DARTNET hosts and routers Access policy: Contact: Dave Mills (mills@udel.edu) dcn3.udel.edu (128.4.0.3) Location: University of Delaware, Newark, DE Synchronization: local net (stratum 0), Fuzzball (line-frequency clock) Service area: NSFNET, SURA region Access policy: not recommended, except for testing Contact: Dave Mills (mills@udel.edu) patch.arpa (26.6.0.2) Location: USECOM Patch Barracks, Stuttgart, West Germany Synchronization: NTP secondary (stratum 2), Fuzzball (line-frequency clock) Service area: MILNET Europe (IMP 2) Access policy: not recommended, except for testing Contact: Buzz Shaw (hshaw@dca-eur.arpa) ======================================================================== Radio timecode receivers and other sources of synchronization Following is a list of radio timecode receivers currently on the market. These devices are attached via a serial asynchronous line, which is used to send poll messages and receive responses in the following example formats: Spectracom clock: q ddd hh:mm:ss tz=zz (22 chars) Truetime clock: ddd:hh:mm:ssq (13 chars) Heath clock: hh:mm:ss.f dd/mm/yr (23 chars) PST clock: hh:mm:ss.fff yy/dd/mm/ddd status (49 chars) These formats are exhibited for example only. In some clocks an extensive repitoire of commands and formats are available. In the Fuzzball implementation the Spectracom and PST clocks are polled, which return the time-code string shown, while the other clocks run continuously. In the Truetime clock the start bit of the last represents on-time, while in the other clocks the first represents on-time. In the time code ddd is day of year, hh:mm:ss is time of day, f is fractions of seconds, and dd/mm/yr is conventional (US) date. In the Spectracom clock, q is " " for in-synch or "?" for off-synch and zz is the time zone (always 00 for UT). In the Truetime clock, q is aprecision estimate in milliseconds and coded as follows: "?" +-500 msec, "#" +-50 msec, "*" +-5 msec, "." +-1 msec, less than 1 msec. In the Heath clock, the hh:mm:ss.f field is displayed as 0?:??:??.? before synch is first established and hh:mm:ss.? once synch is established and then lost again. Model 2201 GPS Receiver Mainframe with Optional RS232 I/O Interface (incl. antenna) ($12,240) Austron, Inc. P.O. Box 14766 Austin, TX 78761 (512) 251-2313 This is a UHF receiver and decoder for satellites of the Global Positioning System. It provides complete decoding of the navigation message, together with an accuracy of 100 ns relative to UTC(GPS). Model GPS-DC GPS Synchronized Clock MK III (incl. antenna) ($9,750) True Time Division, Kinemetrics 3243 Santa Rosa Avenue, Santa Rosa, CA 95407 (707) 528-1230 This is a UHF receiver and decoder for satellites of the Global Positioning System. This product replaces the original Model GPS-DC GPS Synchronized Clock, which sold for $12,500. True Time decoder formats are supported in the Fuzzball operating system. Model 468-DC GOES Satellite Synchronized Clock (incl. antenna) ($5,800) True Time Division, Kinemetrics 3243 Santa Rosa Avenue, Santa Rosa, CA 95407 (707) 528-1230 This is a UHF receiver and decoder for the GOES satellite. True Time decoder formats are supported in the Fuzzball operating system. Model NETCLOCK/2 Computer Clock (incl. 8208 antenna ($1,550) Spectracom Corporation 101 Despatch Drive East Rochester, NY 14445 (716) 381-4827 This is a LF receiver and decoder for the WWVB station. It is supported in the Fuzzball operating system. This product replaces the Model 8170 WWVB Synchronized Clock, which sold for $2,500. For expected accuracies less than +-2 ms, a special 1-pps on-time signal produced by the clock must be used to fine-tune the indication. Model 60-DC WWVB Synchronized Clock (incl. antenna) ($2,500) True Time Division, Kinemetrics 3243 Santa Rosa Avenue, Santa Rosa, CA 95407 (707) 528-1230 This is a LF receiver and decoder for the WWVB station. True Time decoder formats are supported in the Fuzzball operating system. Model LF-DC MSF/DCF77 Synchronized Clock (incl. antenna) ($2,350) True Time Division, Kinemetrics 3243 Santa Rosa Avenue, Santa Rosa, CA 95407 (707) 528-1230 This is a LF receiver and decoder for the MSF station (Rugby, UK) and DCF77 station (Mainflingen, Germany). True Time decoder formats are supported in the Fuzzball operating system. Model OM-DC OMEGA Synchronized Clock (incl. antenna and preamp) ($3,475) True Time Division, Kinemetrics 3243 Santa Rosa Avenue, Santa Rosa, CA 95407 (707) 528-1230 This is a VLF receiver and decoder for the OMEGA stations. True Time decoder formats are supported in the Fuzzball operating system. Model 1020 Integrated Time Source ($1,500) Traconex (Robert Young) 1140 N. Kramer Blvd., Unit G Aneheim, CA 92806 (714) 632-9510 This is an HF receiver and decoder for the WWV/WWVH stations. A Unix driver is included in the NTP daemon ntpd; however, Version 4.01 of the clock firmware is required. It is supported in the Fuzzball operating system. This receiver is now being marketed by the Traconex Corporation. Model GC-1000 Most Accurate Clock ($350) Heath Company Benton Harbor, MI 49022 (616) 982-3411 This is an HF receiver and decoder for the WWV/WWVH stations. It is supported (reluctantly) in the Fuzzball operating system. 8101 Automated Computer Time Service (ACTS) Time and Frequency Division, National Bureau of Standards US Department of Commerce, Gaithersburg, MD 20899 This is a package of C software for the IBM Personal Computer. It can be used to call a special NBS number using either 300-Hz or 1200-Hz modem and set the computer clock. The latest version has been adapted to run on Sun/Unix workstations. Model ? MSF Synchronized Clock ($?) European Electric Systems, Ltd. Woodham Mortimer Place, Rectory Lane Woodham Mortimer, Maldon, Essex. CM9 6SW, United Kingdom +44 24541 5785, (FAX) +44 24541 5785 This is a LF receiver for the MSF (Rugby, UK) station. It is reported they manufacture a US version for the WWVB station. Model 5061A/B Cesium Beam Standard ($38,000) Hewlett Packard, Co. 19310 Pruneridge Avenue Cupertino, CA 95014 This is a cesium-beam primary standard oscillator/clock with accuracy better than 5x10^-12 (about 200 nanoseconds per day). It produces various outputs, including a 1 pulse-per-second output which can be used to stabilize frequency and provide accurate time when used in conjunction with a timecode receiver. It is supported in the Fuzzball operating system. Model 5065A Rubidium Frequency Standard ($33,000)Hewlett Packard, Co. 19310 Pruneridge Avenue Cupertino, CA 95014 This is a rubidium-vapor resonance cell secondary standard oscillator/clock with stability better than 1x10^-11 (about one microsecond per day). It produces various outputs, including a 1 pulse-per-second output which can be used to stabilize frequency and provide accurate time when used in conjunction with a timecode receiver. It is supported in the Fuzzball operating system. Model 105B Quartz Oscillator ($7,500) Hewlett Packard, Co. 19310 Pruneridge Avenue Cupertino, CA 95014 This is an oven-stabilized quartz oscillator with stability better than 5x10^-10 (about 50 microsecond per day). It produces various outputs which can be used to stabilize frequency in a timekeeping system using the NTP local-clock algorithms. Model 2000 LORAN-C Timing Receiver ($20,000) Austron Corp., Austin TX This is a LORAN-C receiver which produces various outputs, including a 1 pulse-per-second output which can be used to stabilize frequency and provide accurate time when used in conjunction with a timecode receiver. It is supported in the Fuzzball operating system. ======================================================================== Timecode transmitters, frequencies and geographic coordinates Call Location Frequencies Coordinates ------------------------------------------------------------------------ WWV Ft. Collins, CO 2.5, 5, 10, 15, 20 MHz 40:40:49.0N 105:02:27.0W WWVB Ft. Collins, CO 60 kHz 40:40:28.3N 105:02:39.5W WWVL Ft. Collins, CO 20 kHz (silent key) 40:40:51.3N 105:03:00.0W WWVH Kauai, HI 2.5, 5, 10, 15 MHz 21:59:26.0N 159:46:00.0W CHU Ottawa, CA 3330, 7335, 14670 45:18N 75:45N DCF77 Mainflingen, DE 77.5 kHz 50:01N 9:00E MSF Rugby, UK 60 kHz 52:22N 1:11W Oddball coordinates (note that one second of latitude is about 31 meters) Newark Hall 39:40:40N, 75:44:57W (survey NAD27) Evans Hall 39:40:49N, 75:45:6W (USGS map NAD27) Christiana Commons 39:41:26N, 75:45:23W (survey NAD27) Backroom 39:42:00N, 75:46:55W (USGS map NAD27) Marina del Rey, CA 33:58:49N, 118:26:20W Control Point NAD27 39:40:48 NAD83 39:40:48.39725 75:45:05 75:45:03.76078 Great-circle distance and bearing computation #define R 6371.2 /* radius of the Earth (km) */ #define PI 3.141592653589 /* the real thing */ #define D2R PI/180 /* degrees to radians */ #define VOFL 2.9979250e8 /* velocity of light (m/s)*/#define hF 320 /* nominal height of F layer (km) */ #define MINBETA 5.*D2R /* min elevation angle (rad) */ double lat1; /* transmitter latitude (deg N) */ double lon1; /* transmitter longitude (deg W) */ double lat2; /* receiver latitude (deg N) */ double lon2; /* receiver longitude (deg W) */ double d; /* great-circle distance (rad) */ double theta; /* hour angle (rad) */ int hop; /* number of ray hops */ double beta; /* elevation angle (rad) */ double delay; /* path delay (ms) */ double dhop; /* hop angle/2 (rad) */ lat1 = lat1*D2R; lon1 = lon1*D2R; lat2 = lat2*D2R; lon2 = lon2*D2R; theta = lon2-lon1; if (theta >= PI) theta = theta-2*PI; if (theta <= -PI) theta = theta+2*PI; d = acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(theta)); if (d < 0) d = PI+d; hop = d/(2*acos(R/(R+hF))); beta = 0; while (beta < MINBETA) { hop = hop+1; dhop = d/(hop*2); beta = atan((cos(dhop)-R/(R+hF))/sin(dhop)); } delay = 2*hop*sin(dhop)*(R+hF)/cos(beta)/VOFL*1e6; Dave sends