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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 ...
WWV Transmitter Building (2002 or earlier) WWV's 15 MHz antenna WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado.It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. [1]
The audio tones are suppressed while WWV is transmitting voice announcements: minutes 00, 08–10, 14–19, and 30. The voice announcements are rescheduled relative to WWV: Station identification is made during minutes 29 and 59 (vs. 00 and 30) GPS satellite health reports are transmitted during minutes 43 and 44 (vs. 14 and 15)
Low power digital TV stations, including translators, that still have alphanumeric call signs based on their channel number receive a "–D" suffix, as in W08EG-D. [15] The FCC makes no differentiation between translating and originating LPTV stations, thus either type of station could have an alphanumeric or a regular "-LP" or "-LD" call sign.
VLF transmissions of Morse code to ships close to U.K. in the 1980s; now used as a military high frequency radio transmitting station FTA2: Saint Assise, France: 16.9 kHz, [5] 20.9 kHz [1: La Regine (FUG) Villemagne, France: 62.6 kHz
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They use long-wave, rather than short-wave or medium-wave, because long-wave signals from the transmitter to the receiver always travel along the same direct path across the surface of the Earth, so the time delay correction for the signal travel time from the transmitting station to the receiver is always the same for any one receiving location.