Contacts may be made at almost any time (that is, a meteor shower is not required to be in progress) at distances of up to 1400 miles (2250 km). FSK441 is generally used on the 2-meter and 70-centimeter amateur bands. Because of the choice of character codes in the protocol, it is self-synchronizing and does not require an explicit synchronization tone. FSK441 employs multi-frequency shift keying using four tones, at a data rate of 441 baud. Such pings may be as short as a tenth of a second and carry enough information to complete at least one stage of a contact. The bursts of signal created by such trails are commonly referred to as "pings", due to their characteristic sound. : 1 FSK441 įSK441, introduced in 2001 as the first communications mode included with WSJT, is designed to support communication using streaks of radio-reflecting ions created in the ionosphere by the trails of meteors entering the Earth's atmosphere. : 17 Two other modes, WSPR and Echo are included for measuring propagation and testing moon bounce echo. Some modes have derived submodes with larger tone spacing. : 6 WSJT-X 1.8 additionally implements the "slow" JT9, FT8, and QRA64. As of WSJT10, supported fast modes are JTMS, FSK441, ISCAT, and JT6M, and the slow modes are JT65 and JT4. While fast modes send character-by-character without error correction, the slow modes aim to optimize for minimal QRO (high-power) use. WSJT's communication modes can be divided into fast and slow modes.
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The software carries a general emphasis on weak-signal operation and advanced DSP techniques however, the communication modes rely upon different ionospheric propagation modes and may be used on many different bands. As of May 2018, the latest WSJT version is WSJT10. This backwards-incompatibility includes JT64A, such that the preview release of JT64A in WSJT7 cannot communicate with the stable release of JT64A in WSJT8. As of version 8.0 (referred to as colloquially as WSJT8) the available modes changed completely such that WSJT8 now offers 5 different modes (JTMS, ISCAT, JT64A, JT8, and Echo) - none of which are back-compatible with WSJT7 or earlier releases. WSJT versions up through 7.06 r1933 (referred to as colloquially as WSJT7) and earlier were aggregations of previous versions, and as such WSJT7 contained 16 different modes (FSK441, JT6M, JT65 variants A - C, JT2, JT4 variants A - G, WSPR, and a preview of JT64A). The latest version of WSJT (not to be confused with WSJT-X) is written in Python and C, with several utilities written in Fortran. Although Joe Taylor was the original developer (and still acts as maintainer), several programmers are currently involved in writing the software. This licensing change required substantial rewrites and took several months to complete. Since 2005, the software has been released as open source software under the GNU General Public License. Communication modes have been both added and removed from the software over the course of its development. WSJT, the predecessor to WSJT-X, was originally released in 2001 and has undergone several major revisions.
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