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

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

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I'm an Amateur Radio enthusiast. I love the hobby and experimenting with radios, antennas and software. On my YouTube channel I upload videos on the Icom 7300 and Icom 7610 along with Ham radio software programs. I hope to inspire people to try new things in Amateur Radio.

8 Responses

  1. blank Larry Miles, N9AJI says:

    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.

  2. blank K0PIR says:

    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?


  3. blank Andy K5PO says:

    Are you running bandpass filters to avoid intermod in the two radios while operating simultaneously?

  4. blank K0PIR says:

    Hi Andy, nice to hear from you and thank you for the question here. Actually no I wasn’t using a bandpass filter. My filter on the radio was set to the widest 3.6k on both radios. AGC fast (not off), noise blanker and noise reduction off and running 20 or 30W. I could see a little distortion in the waterfall down the band, but not enough to interfere making contacts. I wasn’t using a lot of power and as I mentioned the 20m antenna is a two element tri-bander and the 40m antenna is an inverted V. They are both on the same tower. Just seems to work good and surprised me a little too. Sure kept me hopping! Thanks again Andy hope to hear you on their best 73!

    P.S. Maybe it’s just the Icom radios 🙂

  5. blank George says:

    I just got my 7610
    There seems to be a lot of floor noise in the 7610?
    With no NR, ATT, or NB, SSB OR SSB DATA 1 and the AF gain at 12 and vol at 12’o clock. It is a loud QRM hiss.
    My old FT 990 was quite the opposite, almost silent.
    Is this due to the SDR technology, or maybe an issue with the 7610.
    The noise reduction and filtration works great, but I would think a loud floor without an antenna attached would not be what you need?

    Thanks as always

  6. blank K0PIR says:

    Hi George,

    Nice to hear from you and thank you for commenting here.

    That’s very interesting and a very good question. I have not heard anything about that. I have tried it on both of my Icom radios and it is about the same hiss. Not very loud to me. You could go over to the Icom 7610 forum and see if the Hams there have an idea for you.

    Rich, K0PIR

  7. blank Tim says:

    I did this, but ran into a problem. I use HRD to control both radios and interface to WSJT-X. However, after I opened the second WSJT-X, it overwrote the settings on the first instance, from COM9 to COM4. So, I had both instances listening to the same radio on the same com port. How can I get around this

    • blank K0PIR says:

      Hi Tim,
      It’s nice to hear from you, I hope all is well where you are.
      Did you set up the Shortcuts properly?
      Other than that, I did not attempt using HRD for the radio in WSJTX. I used the Icom 7300 and Icom 7610 for the radios in WSJTX.
      It’s trial and error, hi hi.
      Take care, best 73 and good DX!

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