mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-09-19 19:56:33 -04:00
39 lines
2.2 KiB
Plaintext
39 lines
2.2 KiB
Plaintext
|
// Status=review
|
|||
|
|
{wsjtx} 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”, and
|
|||
|
|
the “-X” suffix indicates that {wsjtx} started as an extended (and
|
|||
|
|
experimental) branch of program WSJT.
|
|||
|
|
|
|||
|
|
{wsjtx} offers two protocols or “modes,” JT9 and JT65. Both are
|
|||
|
|
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 (“moon-bounce”) on the VHF/UHF
|
|||
|
|
bands and has also proved very effective for worldwide QRP
|
|||
|
|
communication at HF. JT9 is optimized for the LF, MF, and HF bands.
|
|||
|
|
It is about 2 dB more sensitive than JT65 while using less than 10% of
|
|||
|
|
the bandwidth. Both 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. World-wide QSOs are possible
|
|||
|
|
with power levels of a few watts and compromise antennas.
|
|||
|
|
|
|||
|
|
Starting with version 1.1, {wsjtx} can display a bandpass as large as
|
|||
|
|
5 kHz and provide dual-mode reception of both JT65 and JT9 signals.
|
|||
|
|
If your receiver can be configured with at least 4 kHz bandwidth in
|
|||
|
|
USB mode, you can set your dial frequency to one of the standard JT65
|
|||
|
|
frequencies — for example, 14.076 MHz for 20 meters — and have the
|
|||
|
|
full JT65 and JT9 sub-bands displayed simultaneously on the waterfall.
|
|||
|
|
You can make QSOs in both modes using nothing more than mouse clicks.
|
|||
|
|
|
|||
|
|
Plans for future program development call for {wsjtx} and WSJT to
|
|||
|
|
merge together: {wsjtx} will gradually acquire the additional modes
|
|||
|
|
JT4, FSK441, and ISCAT that are now supported in WSJT. The entire
|
|||
|
|
WSJT-related effort is an open-source project. 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 {devsvn}, and communication among the developers takes place on the
|
|||
|
|
email reflector {devmail}.
|
|||
|
|
|