wsjt-x two instances

Two Instances of WSJT-X Running Simultaneously with Two Radios Two Antennas

In Discussion by K0PIR2 Comments


I saw Hams asking about running two instances of WSJT-X in the forums, so I thought I would try it. If you have a couple of radios and a couple of antennas it’s not hard to do and is pretty fun. I have done this on and off for a few weeks now and it’ll keep a Ham busy. In my station I am running on 20 and 40 meters with the Icom 7610 and Icom 7300. I have a 2 element 20 meter beam and a 40/80 meter inverted vee. They are both attached to the same tower.

Two Instances of WSJT-X Running Simultaneously

Is it useful? I am sure Hams can find a use for it. I do not think transmitting simultaneously (like in the video below) is acceptable in a digital (FT8) contest (check the rules).  This technique should be useful  for hunting DX and you can certainly make a lot of contacts quickly.

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It is fun, but this operation keeps me busy and is a little tiring after a while. Some Hams may like this high activity.

Two Instances of WSJT-X Software Setup

There is some instruction on the WSJT-X website.

How should I configure WSJT-X to run multiple instances?

Start WSJT-X from a command-prompt window, assigning each instance a unique identifier as in the following two-instance example. This procedure will isolate the Settings file and the writable file location for each instance of WSJT-X.

My Screen Captures

WSJT-X JT Alert and Logging

I am running JT Alert, but I did not do anything special with it. In the WSJT-X Reporting tabs you’ll see different ports. That’s all that is needed.

Start one WSJT-X, then start JT Alert. Start the other WSJT-X, then start another instance of JT Alert. It’ll do the rest.

JT Alert is logging to my HRD Logbook.  You can set up JT Alert to log to other logbooks.

I am using a USB cable for each radio.


In the second video below I am calling CQ and transmitting with both radios at the same time. This is not necessary because I can receive on one radio while transmitting with the other.  I don’t get much interference. Have a look at the videos and thanks for watching!

Thank you

Next up DM780 running digital modes.

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WSJT-X 2.0 User Guide


  1. Author

    Hi Larry, nice to hear from you and thank you for commenting here.

    My DM780 does not decode CW perfectly, but it does a pretty good job. I can fill in the missing spots myself. Mainly what I use any of my decoders for is during a CW contest or a DX station sending 30wpm+. It will decode the call sign and exchange pretty well. It gives me some reassurance that I’m getting it correct for the log.

    A good software is CWGET and another one is Fldigi. Have you tried those? Maybe trying those will give you a better idea of how good your DM780 decodes. I don’t know if the most recent DM780 decodes any better than the old free version.

    Are you using a Narrow filter for CW on the 7300?


  2. I am interested in using DM 780 for cw. I have tried it on the free HRD version, but it doesn’t decode fist cw very well. I know the fist is the primary problem, but I was wondering if maybe my rig/ computer settings might be refined to help.
    I am running on a IC 7300 using the free HRD software. If there would be an advantage to purchasing the current version of HRD, I would be open to that.
    Thanks for your help.

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