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WWV, WWVH, and WWVB NIST Special Publication 250-67 NIST Time and Frequency Radio Stations: WWV, WWVH, and WWVB Glenn K. Nelson Michael A. Lombardi Dean T. Okayama NIST Special Publication 250-67 NIST Time and Frequency Radio Stations: WWV, WWVH, and WWVB Glenn K. Nelson Michael A. Lombardi Dean T. Okayama Time and Frequency Division Physics Laboratory National Institute of Standards and Technology 325 Broadway Boulder, Colorado 80305 January 2005 U.S. Department of Commerce Carlos M. Gutierrez, Secretary Technology Administration Phillip J. Bond, Under Secretary for Technology National Institute of Standards and Technology Hratch G. Semerjian., Director Certain commercial entities, equipment, or materials may be identified in this document in order to describe a 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 250-67 Natl. Inst. Stand. Technol. Spec. Publ. 250-67, 160 pages (January 2005) CODEN: NSPUE2 Contents Contents Introduction vii Acknowledgements viii Chapter 1. History and Physical Description 1 A. History of NIST Radio Stations 1 1. History of WWV 1 2. History of WWVH 6 3. History of WWVB 8 B. Physical Description of NIST Radio Station Facilities 10 1. WWV Facilities 10 a) WWV and WWVB Land 10 b) WWV Buildings 13 c) WWV Transmitters 15 d) WWV Antennas and Transmission Lines 16 e) WWV Back-Up Generator 21 f) WWV Time and Frequency Equipment 22 g) Other Equipment (Satellite Systems) 22 2. WWVB Facilities 23 a) WWVB Land 23 b) WWVB Buildings 23 c) WWVB Transmitters 24 d) WWVB Antennas 26 e) WWVB Back-Up Generator 29 f) WWVB Time and Frequency Equipment 30 3. WWVH Facilities 31 a) WWVH Land 31 b) WWVH Buildings 32 c) WWVH Transmitters 33 d) WWVH Antennas 33 e) WWVH Back-Up Generator 35 f) WWVH Time and Frequency Equipment 37 C. Organizational Control of NIST Radio Stations 38 Chapter 2. Technical Description 39 A. How the NIST Radio Stations Work 39 B. Technical Description of WWV 40 1. Timing system 40 2. Broadcast Format 41 iii Remote Frequency Calibrations: The NIST Frequency Measurement and Analysis Service a) Standard Carrier Frequencies 43 b) Voice Time Announcements 43 c) Standard Time Intervals 44 d) Standard Audio Frequencies 45 e) UT1 Corrections 46 f) 100 Hz Time Code 46 g) Official Announcements 48 h) Modulations Levels and Spectrum Allocation 50 i) WWV Signal Monitoring 51 3. Frequencies and Power Levels 52 4. WWV Antennas 54 5. WWV and WWVB Broadcast Monitoring and Alarm Systems 55 6. Commercial Electrical Power Monitoring 58 7. UPS Monitors 58 C. Technical Description of WWVB 59 1. Standard Carrier Frequency and Phase Signature 59 2. Time Code and Time Code Generators 59 3. Frequency and Power Level 62 4. Modes of Operation 62 5. Broadcast Control 63 6. RF Switch Matrix 64 7. Control Console 64 8. Automatic Tuning 64 9. Transmitters 64 10. Helix Houses 65 11. Antennas 68 12. Monitoring and Alarm Systems 69 D. Technical Description of WWVH 70 1. Timing System 70 2. Broadcast Format 71 a) Standard Carrier Frequencies 72 b) Voice Time Announcements 72 c) Standard Time Intervals 73 d) Standard Audio Frequencies 73 e) UT1 Corrections 74 f) 100 Hz Time Code 74 g) Official Announcements 75 h) Modulation Levels and Spectrum Allocation 75 i) WWVH Signal Monitoring 76 3. Frequencies and Power Levels 76 4. WWVH Antennas 77 5. WWVH Broadcast Monitoring and Alarm Systems 79 6. Commercial Electrical Power Monitoring 80 7. UPS Monitors 81 iv Contents E. Telephone Time-of-Day Service 81 1. WWV Telephone Time-of-Day Service 81 2. WWVH Telephone Time-of-Day Service 82 Chapter 3. Operational Procedures 83 A. Hardware Maintenance 83 1. Transmitters and Broadcast Equipment 83 2. Timing Equipment 84 B. Facilities Maintenance 84 C. Scheduled Tasks 85 1. WWV Task Lists 85 2. WWVB Task Lists 87 3. WWVH Task Lists 89 D. Repairs and Service of Equipment 93 1. Facility Service and Repairs at WWV and WWVB 93 2. Facility Service and Repairs at WWVH 93 3. Mission-Specific Service and Repairs at the Radio Stations 94 4. Spare Parts 94 5. Ongoing Tasks 94 E. Failure Modes 95 1. WWV/WWVH Failure Modes 95 a) Timing Failures 95 b) Broadcast Failures 95 c) Other Equipment Failure Modes 96 2. WWVB Failure Modes 97 a) Timing Failures 97 b) Broadcast Failures 97 c) Other Equipment Failure Modes 98 F. Quality Control of Broadcast Information 98 1. Timing Control 98 2. Frequency Control 99 G. Recordkeeping 99 1. Operational Recordkeeping 99 2. Equipment Records 100 3. Other Records 101 4. Software 101 5. Data Backup Procedures 101 H. Physical Security 102 1. Physical Security of WWV and WWVB 102 2. Physical Security of WWVH 102 Chapter 4. Customers 103 A. Estimated Number of Customers 103 1. Estimated Number of Customers for WWV/WWVH 103 v Remote Frequency Calibrations: The NIST Frequency Measurement and Analysis Service 2. Estimated Number of Customers for WWVB 104 3. Estimated Num. of Customers for the Telephone Time-of-Day Service 105 B. Coverage Area for Radio Broadcasts 105 1. Coverage Area for WWV 106 2. Coverage Area for WWVH 107 3. Coverage Area for WWVB 109 a) The Effect of Receiver Sensitivity on Coverage Area Size 111 b) Field Strength Readings (Radial Measurements) 113 c) Monitoring Field Strength in Near Real-Time 115 C. How the NIST Radio Stations are Used by their Customers 115 1. WWV/WWVH Customers 115 a) Time Customers 116 b) Frequency Customers 118 c) Voice Announcement Customers (Non-Timing) 119 2. WWVB Customers 120 a) Time Customers 120 b) Frequency Customers 121 D. Customer Interaction and Support 122 1. Distribution of Information about the NIST Radio Stations 122 a) Web Site 122 b) Publications 122 c) Technical support (e-mail, phone, and postal mail) 124 d) HF Station Voice Announcements 124 Chapter 5. Measurement Uncertainties 125 A. Frequency Uncertainty of Transmitted Radio Signals 125 1. Transmitted Frequency Uncertainty of WWV and WWVB 125 a) The Method Used to Control the Station Clock Frequency 126 2. Transmitted Frequency Uncertainty of WWVH 130 B. Time Uncertainty of Transmitted Radio Signals 132 1. Transmitted Time Uncertainty of WWV and WWVH 133 2. Transmitted Time Uncertainty of WWVB 134 C. Frequency Uncertainty of Received Radio Signals 137 1. Received Frequency Uncertainty of WWV and WWVH 137 2. Received Frequency Uncertainty of WWVB 138 D. Time Uncertainty of Received Radio Signals 142 1. Received Time Uncertainty of WWV and WWVH 142 2. Received Time Uncertainty of WWVB 143 E. Time Uncertainty of Telephone Time-of-Day Service 143 F. Summary of Measurement Uncertainties 145 G. Establishing Traceability to UTC(NIST) 146 References 147 vi Introduction Introduction The National Institute of Standards and Technology (NIST) provides standard time and frequency information through three radio broadcast stations that are routinely used by millions of customers. The stations, WWV and WWVB, located near Fort Collins, Colorado, and WWVH, located on the island of Kauai in Hawaii, are the only radio stations located in the United States whose sole purposes are to distribute standard time and frequency information. This document was written in support of the NIST quality system. It provides a comprehensive look at the NIST time and frequency radio stations. It provides a physical and technical description of each station, and describes how the stations are operated by NIST. It also examines how the stations are used by their customers, and estimates the measurement uncertainties of the radio signals, both as transmitted by NIST and as received by customers. vii NIST Time and Frequency Radio Stations: WWV, WWVH, and WWVB Acknowledgements The authors thank and acknowledge the radio station staff members who help perform the tasks described in these pages, and who contributed to the information contained in this document, including: Matt Deutch, Douglas Sutton, Bill Yates, and Judy Folley of WWV/WWVB, and Edward Pagaduan, Dean Takamatsu, Adele Ochinang, and Don Patterson (now retired from NIST) of WWVH. We also thank the current and former Time and Frequency Services group leaders, John Lowe and Wayne Hanson (now retired from NIST), for their editorial review of the document; Victor Zhang of NIST for his work with the common-view GPS systems used to synchronize the station clocks to UTC(NIST); and Andrew Novick of NIST, who provided the cover art and several of the technical illustrations. And finally, a special thank you is due to Peder Hansen of the Space and Naval Warfare Systems Center, who has made large contributions to the current design of WWVB, and whose technical reports proved to be extremely valuable to the authors while creating this document. viii Chapter 1 - History and Physical Description Chapter 1 History and Physical Description This chapter includes the history of NIST radio stations WWV, WWVB, and WWVB, and then provides a complete physical description of each station’s facilities. It also describes the organizational control of the NIST radio stations. A. History of NIST Radio Stations 1. History of WWV WWV has a long and storied history that dates back to the early days of radio broadcasting. The National Institute of Standards and Technology (NIST) has been involved with radio and radio frequency research almost from its founding in 1901. Scientists at the National Bureau of Standards (NBS), as it was then known, began research in radio frequency propagation as early as 1905. During World War I, NBS had established its Radio Section, which worked closely with the military to research and develop radio techniques for defense and navigation.
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