mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-16 09:01:59 -05:00
1995d762bb
Version information and more in the Windows resources for main
applications, installer and un-installer.
Update CMake policies for new project() command, and DEB
dependency changes
Support older libgfortran packages, and other Linux package
dependencies.
Use new project description file in Debian packaging.
Linux packaging dependency adjustments for Debian style packages,
including a machine readable Debian copyright format, project
description in separate file for CPack compatibility, and use for
DEB packaging.
Configure check for need to link libm Standard C Math Library.
CMake compatibility for <3.17.
68 lines
4.1 KiB
Plaintext
68 lines
4.1 KiB
Plaintext
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 `(W)eak (S)ignal communication by K1(JT),`
|
||
while the suffix `-X` indicates that WSJT-X started as an extended and
|
||
experimental branch of the program WSJT.
|
||
.
|
||
WSJT-X Version 2.0 offers twelve different protocols or modes: FST4,
|
||
FST4W, FT4, FT8, JT4, JT9, JT65, QRA64, ISCAT, MSK144, WSPR, and Echo.
|
||
The first eight are designed for making reliable QSOs under extreme
|
||
weak-signal conditions. They use nearly identical message structure
|
||
and source encoding. JT65 and QRA64 were designed for EME
|
||
(`moonbounce`) on the VHF/UHF bands and have also proven very
|
||
effective for worldwide QRP communication on the HF bands. QRA64 has
|
||
a number of advantages over JT65, including better performance on the
|
||
very weakest signals. We imagine that over time it may replace JT65
|
||
for EME use. JT9 was originally designed for the LF, MF, and lower HF
|
||
bands. Its submode JT9A is 2 dB more sensitive than JT65 while using
|
||
less than 10% of the bandwidth. FST4, and its quasi-beacon companion
|
||
mode FST4W (see below), are designed for LF and MF and offer
|
||
significant advantages over JT9 and WSPR on those bands. JT4 offers a
|
||
wide variety of tone spacings and has proven highly effective for EME
|
||
on microwave bands up to 24 GHz. These four `slow` 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. FT8 is operationally similar but four times faster
|
||
(15-second T/R sequences) and less sensitive by a few dB. On the HF
|
||
bands, world-wide QSOs are possible with any of these modes using
|
||
power levels of a few watts (or even milliwatts) 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.
|
||
.
|
||
ISCAT, MSK144, and optionally submodes JT9E-H are `fast` protocols
|
||
designed to take advantage of brief signal enhancements from ionized
|
||
meteor trails, aircraft scatter, and other types of scatter
|
||
propagation. These modes use timed sequences of 5, 10, 15, or 30 s
|
||
duration. User messages are transmitted repeatedly at high rate (up
|
||
to 250 characters per second, for MSK144) to make good use of the
|
||
shortest meteor-trail reflections or `pings`. ISCAT uses free-form
|
||
messages up to 28 characters long, while MSK144 uses the same
|
||
structured messages as the slow modes and optionally an abbreviated
|
||
format with hashed callsigns.
|
||
.
|
||
WSPR (pronounced `whisper`) stands for (W)eak (S)ignal (P)ropagation
|
||
(R)eporter. 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 reception reports to a
|
||
central database called wsprnet that provides a mapping facility,
|
||
archival storage, and many other features. WSPR has a new companion
|
||
FST4W which has a similar message content but offers up to 30 minute
|
||
transmission periods for greater sensitivity on LF and MF.
|
||
.
|
||
Echo mode allows you to detect and measure your own station's echoes
|
||
from the moon, even if they are far below the audible threshold.
|
||
.
|
||
WSJT-X provides spectral displays for receiver passbands as wide as 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.
|
||
.
|
||
Be sure to read the online WSJT-X User's Guide.
|