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National Time and Signal; Wixom, Michigan (1877–Present)(Introduces the world's first pneumatically controlled master clock system.) New England Clock Company; New Haven, Connecticut (1959–2000) New Haven Clock Company; New Haven, Connecticut (1853–1959) Parker & Whipple; Meriden, Connecticut (1795–1868)
The National Research Council Time Signal was Canada's longest running radio program, begun 5 November 1939 until its final broadcast on 9 October 2023. [1] Broadcast daily shortly before 13:00 Eastern Time across the CBC Radio One network, it lasted between 15 and 60 seconds, ending exactly at 13:00. [ 2 ]
In March 2001, the Observatory was renamed to National Time Service Center of the Chinese Academy of Sciences. [1] NTSC includes short-wave and long-wave standard time and frequency radio stations. And in 2007, low-frequency time signal station began trial broadcasting from Shangqiu. [2]
A standard frequency and time signal service is a station that operates on or immediately adjacent to 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and 25 MHz, as specified by Article 5 of the ITU Radio Regulations (edition 2012). [2]
A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. Church bells or voices announcing hours of prayer gave way to automatically operated chimes on public clocks ; however, audible signals (even signal guns) have limited range.
CHU is the call sign of a shortwave time signal radio station operated by the Institute for National Measurement Standards of the National Research Council. [1] CHU's signal is used for continuous dissemination of official Canadian government time signals , derived from atomic clocks .
WWVB's Colorado location makes the signal weakest on the U.S. east coast, where urban density also produces considerable interference. In 2009, NIST raised the possibility of adding a second time code transmitter, on the east coast, to improve signal reception there and provide a certain amount of robustness to the overall system should weather or other causes render one transmitter site ...
American Signal Corporation (ASC) is an outdoor warning siren and mass notification company in the United States. ASC was founded in 1873 as Biersach and Niedermeyer (B&N) . After performing poorly, the company reformed as Alerting Communicators of America (ACA) in 1968, and expanded the line of warning systems they produced.