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33
NEWS
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Copyright 2001 - 2015 by Joe Taylor, K1JT.
WSJT-X v1.6.0 Release Notice
============================
New Features
------------
WSPR mode, including coordinated automatic band-hopping and a new
two-pass decoder that can decode overlapping signals.
EME-motivated features including JT4 (submodes A-G), Echo mode, and
automatic Doppler tracking. The JT4 decoder is more sensitive than
that in the latest WSJT, and message averaging is fully automated.
(Note that submodes JT65B and JT65C are also present in Version 1.6,
but the high-sensitivity decoder required for EME with JT65 is not yet
included.)
Tools for accurate frequency calibration of your radio, so you can be
always on-frequency to within about 1 Hz.
Mode-specific standard working frequencies accessible from the
drop-down band selector.
Maintenance
-----------
A number of corrections to the Hamlib library, fixing balky
rig-control features. A few unreliable features peculiar to
particular radios have been removed.
WSJT-X v1.5.0 Release Notice
============================

74
README
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Copyright (C) 2001 - 2015 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 is a computer program designed to facilitate basic amateur
radio communication using very weak signals. The first four letters in
the program name stand for “Weak Signal communication by K1JT,” while
the suffix “-X” indicates that WSJT-X started as an extended (and
experimental) branch of the program WSJT.
WSJT-X Version 1.6 offers five protocols or “modes”: JT4, JT9, JT65
WSPR, and Echo. The first three are designed for making reliable 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 proven very effective
for worldwide QRP communication on the HF bands. JT9 is optimized for
the LF, MF, and lower HF bands. It is 2 dB more sensitive than JT65
while using less than 10% of the bandwidth. JT4 offers a wide variety
of tone spacings and has proved very effective for EME on microwave
bands up to 24 GHz. All three of these modes use one-minute timed
sequences of alternating transmission and reception, so a minimal QSO
takes four to six minutes — two or three transmissions by each
station, one sending in odd UTC minutes and the other even. On the HF
bands, world-wide QSOs are possible using power levels of a few watts
and compromise antennas. On VHF bands and higher, QSOs are possible
(by EME and other propagation types) at signal levels 10 to 15 dB
below those required for CW.
WSPR (pronounced “whisper”) stands for Weak Signal Propagation
Reporter. The WSPR protocol was designed for probing potential
propagation paths using low-power transmissions. WSPR messages
normally carry the transmitting station’s callsign, grid locator, and
transmitter power in dBm, and they can be decoded at signal-to-noise
ratios as low as -28 dB in a 2500 Hz bandwidth. WSPR users with
internet access can automatically upload their reception reports to a
central database called {wsprnet} that provides a mapping facility,
archival storage, and many other features.
Echo mode allows you to detect and measure your own lunar echoes, even
if they are far below the audible threshold.
WSJT-X provides spectral displays for passbands up to 5 kHz, flexible
rig control for nearly all modern radios used by amateurs, and a wide
variety of special aids such as automatic Doppler tracking for EME
QSOs and Echo testing. The program runs equally well on Windows,
Macintosh, and Linux systems, and installation packages are available
for all three platforms.
WSJT-X is an open-source project released under the GPL license (See
COPYING). If you have programming or documentation skills or would
like to contribute to the project in other ways, please make your
interests known to the development team. The project’s source-code
repository can be found at https://sourceforge.net/projects/wsjt, and
most communication among the developers takes place on the email
reflector https://sourceforge.net/p/wsjt/mailman. User-level
questions and answers, and general communication among users is found
on the https://groups.yahoo.com/neo/groups/wsjtgroup/info email
reflector.
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: