mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-05-31 22:02:49 -04:00
b0d8f5ee1f
The settings are a linear calibration correction for the rig. Calibration constants are supplied as an intercept error in Hertz and a slope error in parts per million. The correction is applied only to the final frequencies going to and from the radio. This means that any transverter offsets are not corrected. This is appropriate as each transverter will have its own error factors. Transvertor and other individual band specific errors can only be corrected by adjusting the offset for the band. Thanks to Mike W9MDB for an initial implementation of Joe K1JT's suggestion. See also the WSPR documentation for details of calculating the required calibration constants. git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5396 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
__ __ ______ _____ ________ __ __
| \ _ | \ / \ | \| \ | \ | \
| $$ / \ | $$| $$$$$$\ \$$$$$ \$$$$$$$$ | $$ | $$
| $$/ $\| $$| $$___\$$ | $$ | $$ ______ \$$\/ $$
| $$ $$$\ $$ \$$ \ __ | $$ | $$| \ >$$ $$
| $$ $$\$$\$$ _\$$$$$$\| \ | $$ | $$ \$$$$$$/ $$$$\
| $$$$ \$$$$| \__| $$| $$__| $$ | $$ | $$ \$$\
| $$$ \$$$ \$$ $$ \$$ $$ | $$ | $$ | $$
\$$ \$$ \$$$$$$ \$$$$$$ \$$ \$$ \$$
Copyright (C) 2001 - 2014 by Joe Taylor, K1JT.
WSJT-X implements JT9, a new mode designed especially for the LF, MF,
and HF bands, as well as the popular mode JT65. Both modes were
designed for making reliable, confirmed QSOs under extreme weak-signal
conditions. They use nearly identical message structure and source
encoding. JT65 was designed for EME (“moonbounce”) on the VHF/UHF
bands and has also proved very effective for worldwide QRP
communication at HF; in contrast, JT9 is optimized for HF and lower
frequencies. JT9 is about 2 dB more sensitive than JT65A while using
less than 10% of the bandwidth. World-wide QSOs are possible with
power levels of a few watts and compromise antennas. A 2 kHz slice of
spectrum is essentially full when occupied by ten JT65 signals. As
many as 100 JT9 signals can fit into the same space, without overlap.
WSJT-X offers a “bi-lingual” operating mode in which you can transmit
and receive JT65 and JT9 signals, switching between modes
automatically as needed. Displayed bandwidth can be as large as 5
kHz. If your receiver has as upper-sideband filter at least 4 kHz
wide, you can have all the typical JT65 and JT9 activity on screen at
once, available for making QSOs with a click of the mouse. Even with
standard SSB-width IF filters, switching between JT65 and JT9 modes is
quick and convenient. Be sure to read the online WSJT-X User's Guide.
Project web site:
http://www.physics.princeton.edu/pulsar/K1JT/wsjtx.html
Project mailing list (shared with other applications from the same
team):
https://groups.yahoo.com/neo/groups/wsjtgroup