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A Century of WWV
Volume 124, Article No. 124025 (2019) https://doi.org/10.6028/jres.124.025 Journal of Research of the National Institute of Standards and Technology A Century of WWV Glenn K. Nelson National Institute of Standards and Technology, Radio Station WWV, Fort Collins, CO 80524, USA [email protected] WWV was established as a radio station on October 1, 1919, with the issuance of the call letters by the U.S. Department of Commerce. This paper will observe the upcoming 100th anniversary of that event by exploring the events leading to the founding of WWV, the various early experiments and broadcasts, its official debut as a service of the National Bureau of Standards, and its role in frequency and time dissemination over the past century. Key words: broadcasting; frequency; radio; standards; time. Accepted: September 6, 2019 Published: September 24, 2019 https://doi.org/10.6028/jres.124.025 1. Introduction WWV is the high-frequency radio broadcast service that disseminates time and frequency information from the National Institute of Standards and Technology (NIST), part of the U.S. Department of Commerce. WWV has been performing this service since the early 1920s, and, in 2019, it is celebrating the 100th anniversary of the issuance of its call sign. 2. Radio Pioneers Other radio transmissions predate WWV by decades. Guglielmo Marconi and others were conducting radio research in the late 1890s, and in 1901, Marconi claimed to have received a message sent across the Atlantic Ocean, the letter “S” in telegraphic code [1]. Radio was called “wireless telegraphy” in those days and was, if not commonplace, viewed as an emerging technology. -
NIST Time and Frequency Services (NIST Special Publication 432)
Time & Freq Sp Publication A 2/13/02 5:24 PM Page 1 NIST Special Publication 432, 2002 Edition NIST Time and Frequency Services Michael A. Lombardi Time & Freq Sp Publication A 2/13/02 5:24 PM Page 2 Time & Freq Sp Publication A 4/22/03 1:32 PM Page 3 NIST Special Publication 432 (Minor text revisions made in April 2003) NIST Time and Frequency Services Michael A. Lombardi Time and Frequency Division Physics Laboratory (Supersedes NIST Special Publication 432, dated June 1991) January 2002 U.S. DEPARTMENT OF COMMERCE Donald L. Evans, Secretary TECHNOLOGY ADMINISTRATION Phillip J. Bond, Under Secretary for Technology NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY Arden L. Bement, Jr., Director Time & Freq Sp Publication A 2/13/02 5:24 PM Page 4 Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY SPECIAL PUBLICATION 432 (SUPERSEDES NIST SPECIAL PUBLICATION 432, DATED JUNE 1991) NATL. INST.STAND.TECHNOL. SPEC. PUBL. 432, 76 PAGES (JANUARY 2002) CODEN: NSPUE2 U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 2002 For sale by the Superintendent of Documents, U.S. Government Printing Office Website: bookstore.gpo.gov Phone: (202) 512-1800 Fax: (202) -
KHF 950/990 HF Communications Transceiver PILOT’S GUIDE and DIRECTORY of HF SERVICES
KHF 950/990 HF Communications Transceiver PILOT’S GUIDE AND DIRECTORY OF HF SERVICES A Table of Contents INTRODUCTION KHF 950/990 COMMUNICATIONS TRANSCEIVER . .I SECTION I CHARACTERISTICS OF HF SSB WITH ALE . .1-1 ACRONYMS AND DEFINITIONS . .1-1 REFERENCES . .1-1 HF SSB COMMUNICATIONS . .1-1 FREQUENCY . .1-2 SKYWAVE PROPAGATION . .1-3 WHY SINGLE SIDEBAND IS IMPORTANT . .1-9 AMPLITUDE MODULATION (AM) . .1-9 SINGLE SIDEBAND OPERATION . .1-10 SINGLE SIDEBAND (SSB) . .1-10 SUPPRESSED CARRIER VS. REDUCED CARRIER . .1-10 SIMPLEX & SEMI-DUPLEX OPERATION . .1-11 AUTOMATIC LINK ESTABLISHMENT (ALE) . .1-11 FUNCTIONS OF HF RADIO AUTOMATION . .1-11 ALE ASSURES BEST COMM LINK AUTOMATICALLY . .1-12 SECTION II KHF 950/990 SYSTEM DESCRIPTION. .2-1 KCU 1051 CONTROL DISPLAY UNIT . .2-1 KFS 594 CONTROL DISPLAY UNIT . .2-3 KCU 951 CONTROL DISPLAY UNIT . .2-5 KHF 950 REMOTE UNITS . .2-6 KAC 952 POWER AMPLIFIER/ANT COUPLER .2-6 KTR 953 RECEIVER/EXITER . .2-7 ADDITIONAL KHF 950 INSTALLATION OPTIONS .2-8 SINGLE KHF 950 SYSTEM CONFIGURATION .2-9 KHF 990 REMOTE UNITS . .2-10 KAC 992 PROBE/ANTENNA COUPLER . .2-10 KTR 993 RECEIVER/EXITER . .2-11 SINGLE KHF 990 SYSTEM CONFIGURATION . .2-12 Rev. 0 Dec/96 KHF 950/990 Pilots Guide Toc-1 Table of Contents SECTION III OPERATING THE KHF 950/990 . .3-1 KHF 950/990 GENERAL OPERATING INFORMATION . .3-1 PREFLIGHT INSPECTION . .3-1 ANTENNA TUNING . .3-2 FAULT INDICATION . .3-2 TUNING FAULTS . .3-3 KHF 950/990 CONTROLS-GENERAL . .3-3 KCU 1051 CONTROL DISPLAY UNIT OPERATION . -
Time Signal Stations 1By Michael A
122 Time Signal Stations 1By Michael A. Lombardi I occasionally talk to people who can’t believe that some radio stations exist solely to transmit accurate time. While they wouldn’t poke fun at the Weather Channel or even a radio station that plays nothing but Garth Brooks records (imagine that), people often make jokes about time signal stations. They’ll ask “Doesn’t the programming get a little boring?” or “How does the announcer stay awake?” There have even been parodies of time signal stations. A recent Internet spoof of WWV contained zingers like “we’ll be back with the time on WWV in just a minute, but first, here’s another minute”. An episode of the animated Power Puff Girls joined in the fun with a skit featuring a TV announcer named Sonny Dial who does promos for upcoming time announcements -- “Welcome to the Time Channel where we give you up-to- the-minute time, twenty-four hours a day. Up next, the current time!” Of course, after the laughter dies down, we all realize the importance of keeping accurate time. We live in the era of Internet FAQs [frequently asked questions], but the most frequently asked question in the real world is still “What time is it?” You might be surprised to learn that time signal stations have been answering this question for more than 100 years, making the transmission of time one of radio’s first applications, and still one of the most important. Today, you can buy inexpensive radio controlled clocks that never need to be set, and some of us wear them on our wrists. -
STANDARD FREQUENCIES and TIME SIGNALS (Question ITU-R 106/7) (1992-1994-1995) Rec
Rec. ITU-R TF.768-2 1 SYSTEMS FOR DISSEMINATION AND COMPARISON RECOMMENDATION ITU-R TF.768-2 STANDARD FREQUENCIES AND TIME SIGNALS (Question ITU-R 106/7) (1992-1994-1995) Rec. ITU-R TF.768-2 The ITU Radiocommunication Assembly, considering a) the continuing need in all parts of the world for readily available standard frequency and time reference signals that are internationally coordinated; b) the advantages offered by radio broadcasts of standard time and frequency signals in terms of wide coverage, ease and reliability of reception, achievable level of accuracy as received, and the wide availability of relatively inexpensive receiving equipment; c) that Article 33 of the Radio Regulations (RR) is considering the coordination of the establishment and operation of services of standard-frequency and time-signal dissemination on a worldwide basis; d) that a number of stations are now regularly emitting standard frequencies and time signals in the bands allocated by this Conference and that additional stations provide similar services using other frequency bands; e) that these services operate in accordance with Recommendation ITU-R TF.460 which establishes the internationally coordinated UTC time system; f) that other broadcasts exist which, although designed primarily for other functions such as navigation or communications, emit highly stabilized carrier frequencies and/or precise time signals that can be very useful in time and frequency applications, recommends 1 that, for applications requiring stable and accurate time and frequency reference signals that are traceable to the internationally coordinated UTC system, serious consideration be given to the use of one or more of the broadcast services listed and described in Annex 1; 2 that administrations responsible for the various broadcast services included in Annex 2 make every effort to update the information given whenever changes occur. -
What Time I T
Does Anybody Really What Time It Is? 24/7/365, Here's How Time Got On Your Best Side By Michael A. Lombardi ccasionally I'll talk to people who known to most radio buffs. He used a can't believe that some radio sta- spark-gap transmitter to successfully 0tions exist solely to transmit accu- send radio signals over a distance of more rate time. While they wouldn't poke fun than one mile in 1895. By 1899 he had at the Weather Channel or even a radio transmitted signals across the English station that plays nothing but Garth Channel, and sent signals across the Brooks records (imagine that), people Atlantic Ocean in 1901. often make jokes about time signal sta- Surprisingly, in the midst of Marconi's tions. They'll ask "Doesn't the program- early work, before any radio stations exist- ming get a little boring?'or "How does ed, or before the public even completely the announcer stay awake?'There have believed his results, a proposal was made even been parodies of time signal sta- to use the new wireless medium to broad- tions. A recent Internet spoof of WWV cast time. In November 1898. an optical containedzingers like "we'll be back with instrument maker and inventor named Sir the time on WWV in just a minute, but Howard Grubb addressed the Royal first, here's another minute." Dublin Society and proposed the concept An episode of the animated Powerpuff of a radio controlled clock. After many Girls joined in the fun with a skit featur- years of working with astronomical obser- ing a TV announcer named Sonnv Dial L, vatories. -
Time and Frequency Users' Manual
,>'.)*• r>rJfl HKra mitt* >\ « i If I * I IT I . Ip I * .aference nbs Publi- cations / % ^m \ NBS TECHNICAL NOTE 695 U.S. DEPARTMENT OF COMMERCE/National Bureau of Standards Time and Frequency Users' Manual 100 .U5753 No. 695 1977 NATIONAL BUREAU OF STANDARDS 1 The National Bureau of Standards was established by an act of Congress March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, a technical (3) basis for equity in trade, and (4) technical services to pro- mote public safety. The Bureau consists of the Institute for Basic Standards, the Institute for Materials Research the Institute for Applied Technology, the Institute for Computer Sciences and Technology, the Office for Information Programs, and the Office of Experimental Technology Incentives Program. THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consist- ent system of physical measurement; coordinates that system with measurement systems of other nations; and furnishes essen- tial services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce. The Institute consists of the Office of Measurement Services, and the following center and divisions: Applied Mathematics -
Radiorama N.58.Pdf
Panorama radiofonico internazionale n. 58 Dal 1982 dalla parte del Radioascolto Rivista telematica edita in proprio dall'AIR Associazione Italiana Radioascolto c.p. 1338 - 10100 Torino AD www.air-radio.it lll’angolo delle QSL storiche … radiorama PANORAMA RADIOFONICO INTERNAZIONALE organo ufficiale dell’A.I.R. Associazione Italiana Radioascolto recapito editoriale: radiorama - C. P. 1338 - 10100 TORINO AD e-mail: [email protected] AIR - radiorama - Responsabile Organo Ufficiale: Giancarlo VENTURI - Responsabile impaginazione radiorama: Bruno PECOLATTO - Responsabile Blog AIR-radiorama: i singoli Autori - Responsabile sito web: Emanuele PELICIOLI ------------------------------------------------- Il presente numero di radiorama e' pubblicato in rete in proprio dall'AIR Associazione Italiana Radioascolto, tramite il server Aruba con sede in località Palazzetto, 4 - 52011 Bibbiena Stazione (AR). Non costituisce testata giornalistica, non ha carattere periodico ed è aggiornato secondo la disponibilità e la reperibilità dei materiali. Pertanto, non può essere considerato in alcun modo un prodotto editoriale ai sensi della L. n. 62 del 7.03.2001. La responsabilità di quanto pubblicato è esclusivamente dei singoli Autori. L'AIR-Associazione Italiana Radioascolto, costituita con atto notarile nel 1982, ha attuale sede legale presso il Presidente p.t. avv. Giancarlo Venturi, viale M.F. Nobiliore, 43 - 00175 Roma SR1 EUROPAWELLE SAAR 1421kHz, GERMANIA (anni ‘80) RUBRICHE : Pirate News - Eventi Collabora con noi, invia i tuoi articoli come da protocollo. Il Mondo in Cuffia - Scala parlante e-mail: [email protected] Grazie e buona lettura !!!! Vita associativa - Attività Locale Segreteria, Casella Postale 1338 10100 Torino A.D. radiorama on web - numero 58 e-mail: [email protected] ------------------------ [email protected] Rassegna stampa – Giampiero Bernardini SOMMARIO e-mail: [email protected] ------------------------ In copertina : "Musica a richiesta - Radio Trst", opera di Vilma Coti (cortesia Rubrica FM – Giampiero Bernardini Dorigo Valdi). -
Nbs Technical Note 674 National Bureau of Standards
NBS TECHNICAL NOTE 674 NATIONAL BUREAU OF STANDARDS The National Bureau of Standards' was established by an act of Congress March 3, ,1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau consists of the Institute for Basic Standards, the Institute for Materials Research, the Institute for Applied Technology, the Institute for Computer Sciences and Technology, and the Office for Information Programs. THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consistent system of physical measurement; coordinates that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce. The Institute consists of the Office of Measurement Services, the Office of Radiation Measurement and the following Center and divisions: Applied Mathematics - Electricity - Mechanics - Heat - Optical Physics - Center for Radiation Research: Nuclear Sciences; Applied Radiation - Laboratory Astrophysics * - Cryogenics ' - Electromagnetics - Time and Frequency *. THE INSTITUTE FOR MATERIALS RESEARCH conducts materials research leading to improved methods of measurement, standards, and data on the properties of well-characterized materials needed by industry, commerce, educational institutions, and Government; provides advisory and research services to other Government agencies; and develops, produces, and distributes standard reference materials. -
Time and Frequency Users Manual
A 11 10 3 07512T o NBS SPECIAL PUBLICATION 559 J U.S. DEPARTMENT OF COMMERCE / National Bureau of Standards Time and Frequency Users' Manual NATIONAL BUREAU OF STANDARDS The National Bureau of Standards' was established by an act of Congress on March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau's technical work is per- formed by the National Measurement Laboratory, the National Engineering Laboratory, and the Institute for Computer Sciences and Technology THE NATIONAL MEASUREMENT LABORATORY provides the national system of physical and chemical and materials measurement; coordinates the system with measurement systems of other nations and furnishes essential services leading to accurate and uniform physical and chemical measurement throughout the Nation's scientific community, industry, and commerce; conducts materials research leading to improved methods of measurement, standards, and data on the properties of materials needed by industry, commerce, educational institutions, and Government; provides advisory and research services to other Government agencies; develops, produces, and distributes Standard Reference Materials; and provides -
Wwvb Time Code
Time & Freq Sp Publication A 2/13/02 5:24 PM Page 1 NIST Special Publication 432, 2002 Edition NIST Time and Frequency Services Michael A. Lombardi Time & Freq Sp Publication A 4/22/03 1:32 PM Page 3 NIST Special Publication 432 (Minor text revisions made in April 2003) NIST Time and Frequency Services Michael A. Lombardi Time and Frequency Division Physics Laboratory (Supersedes NIST Special Publication 432, dated June 1991) January 2002 U.S. DEPARTMENT OF COMMERCE Donald L. Evans, Secretary TECHNOLOGY ADMINISTRATION Phillip J. Bond, Under Secretary for Technology NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY Arden L. Bement, Jr., Director Time & Freq Sp Publication A 2/13/02 5:24 PM Page 4 Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY SPECIAL PUBLICATION 432 (SUPERSEDES NIST SPECIAL PUBLICATION 432, DATED JUNE 1991) NATL. INST.STAND.TECHNOL. SPEC. PUBL. 432, 76 PAGES (JANUARY 2002) CODEN: NSPUE2 U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 2002 For sale by the Superintendent of Documents, U.S. Government Printing Office Website: bookstore.gpo.gov Phone: (202) 512-1800 Fax: (202) 512-2250 Mail: Stop SSOP,Washington, DC 20402-0001 -
Measurements of Propagation Delays Between WWV/WWVH and Anchorage, Alaska Whitham D
Measurements of Propagation Delays Between WWV/WWVH and Anchorage, Alaska Whitham D. Reeve 1. Introduction The measurements described here show that the propagation delays between WWV or WWVH time service broadcast stations and a receiver in Anchorage, Alaska are discernible in an audio recording. The propagation delays are on the order of 13 to 15 ms. These measurements are an initial step toward determining the time resolution that might be attainable while analyzing audio recordings of Jupiter s-bursts and other high frequency radio phenomena. It is noted that measuring easily recognizable audio tones (as in this paper) are presumably much easier than measuring noise-like extraterrestrial radio emissions. As described in detail below, post-processing measurements with sub-millisecond resolution can be achieved when the received signal voltage amplitudes are roughly > 6 dB above background noise. At lower voltage signal-to-noise ratios, the ability to recognize the start and end intervals of the WWV/WWVH tones is degraded but measurements with millisecond resolution are still possible. Summary of measurement results: Measurement Measured value Remarks Soundcard timing accuracy +10 ppm measured over 0.2 to 3 minute intervals using PPS Excess propagation delay 0 to +4 ms Referred to calculated delay PPS interval 1.000 010 s Typical PPS pulse width 100 ms Measured between leading to trailing edges Resolution 1 μs Waveform displayed in Goldwave audio software WWV or WWVH second tock width 5 to 8 ms Transmitted width is 5 ms WWV or WWVH minute tone width 800.3 to 800.4 ms Transmitted width is 800 ms 2.