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WSJT 4.6 User’s Guide
Copyright 2004 by Joe Taylor, K1JT
WSJT is a computer program for VHF/UHF communication using state of the art digital
techniques. It can decode signals propagated by fraction-of-a-second reflections from
meteor trails, as well as steady signals 10 to 20 dB weaker than those needed for
conventional CW or SSB.
Operating Modes
• FSK441 for high speed meteor scatter
• JT6M for meteor/ionospheric scatter on 6 meters
• JT65 for extremely weak troposcatter and EME
• EME Echo for detecting your own echoes from the moon
System Requirements
• SSB transceiver and antenna for one or more VHF/UHF bands
• Computer running Microsoft Windows
• 200 MHz or faster CPU
• 32 MB of available RAM
• Monitor with 800 x 600 or higher resolution
• Windows compatible sound card
• Computer-to-radio interface using a serial port to key your PTT line (or use VOX)
• Audio connections between transceiver and sound card
• A means for synchronizing the computer’s clock to UTC
Quick-Start Installation and Setup
1. Download WSJT from http://pulsar.princeton.edu/~joe/K1JT or the European
mirror site,
http://www.vhfdx.de.
2. Execute the downloaded file to install WSJT to a directory of your choice.
3. If you have not already done so, print a copy of this manual and keep it handy.
4. Connect appropriate interface cables between your computer and radio. (For help with
the hardware interface, refer to one of the many descriptions of other sound card modes
such as PSK31.)
5. To start the program, double-click on the desktop icon for WSJT.
6. Select Options from the Setup menu (see picture on next page) and enter your callsign,
grid locator, and UTC offset. Click Done to dismiss the Options screen.
7. Select Setup | Set COM Port and enter the number of the serial port you will use for
T/R control. Enter 0 if you will use VOX control.
8. Indicate on the Setup menu whether you wish to use the DTR or RTS line for PTT
control. (If not sure, check both.)
These settings should be adequate for learning your way around the program. If you are
new to WSJT, work through the examples at the top of page 3 and then continue reading
this manual, stopping to experiment with the program when it seems appropriate.