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WSJT-X is a computer program used for weak-signal radio communication between amateur radio operators. The program was initially written by Joe Taylor, K1JT , but is now open source and is developed by a small team.
Each channel symbol conveys one sync bit (LSB) and one data bit (MSB). Duration of transmission is 162 × 8192 ⁄ 12000 = 110.6 s. Transmissions nominally start one second into an even UTC minute: e.g., at hh:00:01, hh:02:01, etc. Minimum S/N for reception is around –34 dB on the WSJT scale (2500 Hz reference bandwidth).
WSJT is useful for passing short messages via non-traditional radio communications methods, such as moonbounce and meteor scatter and other low signal-to-noise ratio paths. It is also useful for extremely long-distance contacts using very low power transmissions. Taylor is also the co-creator of the FT8 mode.
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]
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In a one-way time transfer system, one end transmits its current time over some communication channel to one or more receivers. [4]: 116 The receivers will, at reception, decode the message, and either just report the time, or adjust a local clock which can provide hold-over time reports in between the reception of messages. The advantage of ...
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