FT-450D WSTJ-X Config

Setting up WSJT-X can be be a struggle if all the hardware and settings do not align. Based on a question by a reader a quick post on what has been working for me.


  • Avoid Prolific USB cables, too easy to get a clone and have issues with drivers. I am very happy with the Gearmo adapter, while it is a few bucks more than a plain cable the diagnostic LED’s are a wonderful aid. You will also need a straight Female to Female cable to convert the connector gender to what the radio and the USB cable need.
  • If you can solder make up your own audio cables, no need to lay out $$$ for a ham marketed external sound card. This is not hard to do, make your own.

Shopping list.

FT450D Settings

  1. CAT RTS Disable
  2. CAT TOT 10
  3. CAT Rate 38400

WSJT-X Setup

Your serial port # may vary from my environment. Once you mimic the settings below, pressing the “Test CAT” should get you a “Green” success.

I use an external USB sound card as I detailed in a separate posting.

Do it yourself Yaesu FT-450D Digital interface

The audio settings are simple to config chose the Microphone and Speakers which are appropriate to your setup. You will need to adjust the levels on both the input and output.


On your task bar you should have a speaker icon. Right click on this and select recording or playback devices, you will need to review both.

I have selected recording and a dialog similar to below will be displayed.

Adjust the level of the device as needed to bring the levels in the desired range in WSJT-X. The WSJT-X application has controls to adjust TX and RX levels, you do not want to run those controls at either extreme. Adjust these levels to achieve that.

Also ensure that the radio sound card is not the “Default Device” or “Default Communications Device”


Until next time

73 Jay


  1. Evening Jay,

    Got everything hooked up and I am making some headway with JT65. Now I do have Rig control, receive is working fine. Under settings when I hit the Test Cat it does turn green now.

    One problem I still have, when I try to transmit I get now RF power out as shown on the FT-450 meter. Any suggestions on what that problem may be?

    I really appreciate your time Jay, you have been very helpful.

    Thank you.

    • John,

      If you hear the radio switch into TX mode with no power out your problem is in the audio path. Ensure that the proper output device is selected in WSJT-X. If the radio is not entering TX, check the radio config and ensure that PTT is set to CAT. You also have the knobs on the Signalink to worry about, be very careful not to overdrive on TX, your objective is no as in zero ALC. Set your TX power level to 30 watts or so and watch the ALC level, none is the objective.

      73, Jay

      • Hi Jay,

        I am using the Signalink Interface in my setup. When I changed the PTT Method from CAT to VOX I got RF Power out. I made my first FT8 contact this afternoon on 40 meters.

        Thank you again for your advice and hand holding through this process.

        Very 73,
        John W9QP

  2. Hi Jay,

    Just a quickie question, when using my FT450D for digital modes USB is highlighted on the radio, when transmitting it goes to USB Data then back to USB on receive. Is this the normal operation, seems to be working fine?

    Thanks again.
    John W9QP

    • John,

      Is the WSJT-X settings, radio tab ensure you have FT-450 selected as the radio, and Mode set to Data/Pkt, PTT set to CAT and the correct speed. If Mode is none then the radio will stay in whatever mode you select via the front panel. Setting to Data/PKT will put the radio in USB DATA.

      73, Jay

  3. Good afternoon, Jay. I have a FT450D and have been using SignalLink USB for a couple of years on psk with success. Although I have been licensed since 1963 I have been slow to try out other digital modes. Today I downloaded the WSJT-X software. I cannot get a “green light” on the Test CAT settings screen no matter how many combinations I try. My serial port only indicates USB and the PTT Method Port indicates only USB. Any suggestions for setting up my Yaesu FT450D with WSJT-x for use on FT8 ?

  4. Any help in getting a green light on Test CAT would be appreciated. I am using a Yaesu FT450D, Signal Link USB and for the first time FT8 software via WSJT-X. My serial and PTT method ports default to USB. Thanks in advance.

  5. Hello

    I have FT450 (not D version).I followed your recommendation about the serial to usb cable and bought it.
    I also has simple usb sound card that works fine.
    When I’m working with VOX everything functioning good.
    When I’m working with CAT and all configuration as you wrote above while transmitting the power
    Drops almost to zero.
    I didn’t changed anything in sound card configuration.
    I need the CAT to work with SPLIT (Fox/Hound) mode.
    Any Idea to solve this problem.

    ELI – 4Z5PJ

    • Eli,

      Sorry for delay I wanted to test and ensure the 1.9.1 works fine with my FT450D prior to responding. As you have not provided much detail on when you have checked I would start with the radio power setting. If yours is like the D this is in a menu setting RFPOWER. Next I would check the audio level setting in Windows for your USB soundcard and check the TX level (PWR Slider) in WJST-X. I set mine by using the tune button and then raising the level until max output is reached. I then reduce the level until I see a reduction in output power on the PO (Power Out) meter on the 450D and leave the slider in this position.

      I use have used Split and no split with success. If you roll your VFO down 500hz it will bring the Fox up into the bandpass of the 450. Likewise you will need to do the math in your head and keep your TX signal up above 1500hz assuming a 500hz offset.

      Hope this helps, Jay

      • Hello

        Thanks for your reply.I’ll try to test it like you suggested and see if it helps.
        As I wrote the problem occurs only when I’ trying to work with CAT.
        If I’m working with VOX there is no problem.

        ELI – 4Z5PJ

  6. Hi Jay

    I followed your reply and after changing configuration on the sound cards and checked DATA/PKT ,It’s
    working now and I’m enjoying every minute on FT8.
    Appriciate very mucu your help and maybe will meet on the bands sometime.

    ELI – 4Z5PJ


    je suis F4HJL Christophe
    j’ai un FT450D + SCU 17 + WJST-X et rien de fonctionne.
    Je suis perdu
    Si vous pouvez m’aider dans tous les réglages ! merci beaucoup
    73 F4HJL Christophe

    • Christophe,

      Happy to try and help you, first more detail is needed. Your note indicates you have a pile of hardware and nothing works. In order to diagnose your issue remotely I will need the history of what you have done to date and specifically what is not working. As a start please answer the following questions.

      1) Did you install the SCU17 driver prior to connecting the SCU17 to your PC?
      2) What version of WSJT-X are you using?
      3) What are your radio and audio setup in WSJT-X
      4) On the 450D, menu settings for CAT what are the values for the the three cat items CAT RTS, CAT TOT, CAT RATE.
      5) Describe what is not working audio, cat, ptt all of the above.


  8. Hello Jay
    1) SCU Driver is OK
    2) WSJT-X is 1.9.1
    3) Radio usb audio codek and audio usb codek
    4) CAT RTS = disable CAT TOT = 10 CAT RATE = 38400
    5) the audio is no good

  9. I’ve just bought my first ever amateur rig, the FT-450D. I got my callsign in November 2018. First wanderings in digital modes was with a cheap ud01un TNC and a borrowed FT-840. Everything went well. After trying the same thing with my shiny new FT-450D however, I could not get the rig into USB data mode with wsjt-x. Out of the box the data mode was stuck in LSB data. I found an answer with experimentation. Start FLdigi, get CAT serial cable connected, change the mode to USB / pkt, close FLdigi and it should be good to go in USB / data mode. What I want to know is why when selecting a mode or frequency in wsjt-x does it not change the rig into the correct SSB sideband and mode?

    • Larry,

      I need more information on your setup, need to start at square 1.

      Version of WSJT-X
      Cat cable is in place?
      WSJT-X Radio setup tab

      does test CAT work?


  10. Having a strange issue with my FT-450D and WSJT-X. When monitoring WSJT-X CQ calls etc. The rig’s AF Gain must be up to at least a 2 (as shown on HRD). So I need to hear the FT8 noise for the FT450D to be able to listen. I am using SignaLink USB along with HRD and for the most part have everything set the way it’s setup on the web page. So then I was wondering does this sound like a hardware or software issue? Or where to I start looking? Thank you in advance.

    • Steve,

      If the Signalink is connected to the data port on the rear of the radio the volume can be set to minimum. Check and ensure that WSJT-X audio input is using the Signal link and not the built in microphone on your PC. the rear output out of the 450 is not adjustable in the radios menu nor does the front panel control the levels.

      73, Jay

  11. Hello, just got an ft-450D last week and am trying to get it set up for WSJT-X FT8.. Through some googling I’ve managed to make it transmit with the data cable, but ALC is maxed out.. this should be pretty low/no ALC, yes? How do I get that level to lower?

    Rig is set up with just a data cable(no cat for now) going to a simple Easy-Digi VOX interface(basically, just isolation transformers).

    Thanks for any help,

    • Sam,

      Yes little to no ALC is the goal otherwise your signal quality will degrade and your station will splatter. To adjust TX audio level you will need to reduce the speaker level on the sound interface you are using. Which based on your description is the motherboard built in sound card on your PC. You will also want to disable all sounds by setting your sound scheme in windows to “No Sounds” otherwise you will TX whenever windows makes a sound.

      73, Jay

  12. Hi Everybody

    Before sending my FT-450AT to repair I’ll ask here about problem started on FT8 TX
    And I want to be sure if it’s rig problem or not.
    All settings I have before the problem started on WSJT-X Ver. 2.0.0 and sound card
    Did not changed.I also purchased new USB sound card connected to the data on the
    Rear of the 450AT.When TX I hear the relay but there’s no power out.Also I tried to
    Work in VOX but in this case I don’t here the relay.
    I don’t have TX problem in SSB or CW.
    Any suggetions?I’ll appericiate any help.

    ELI – 4Z5PJ

  13. Hi Jay

    OK.I sent CQ and in the headphone connected to the pc I heard sound but
    No power out on the 450.It seems I have problem in te radio.


    • Eli,

      What is your Soundcard output setting in WSJT-X? Is the interface the cable to the radio using this interface? Next in the windows sound control panel verify the level for the playback device you selected in WSJT.


  14. Hi Jay

    I have a simple soundcard connected to USB from the 6 pin connector on the radio.
    It’s configured fine in WSJT.The level of the speakers is 50.


    • Eli,

      Ok the speaker level for this USB soundcard is set at 50 and if you connect a headset you hear FT8 sounds. And the cable to the radio has not failed, I would agree indications are a problem with the rear input. Is the radio output working are you receiving and decoding traffic?


  15. Hi Jay

    Yes.I’m receiving and decoding on WSJT,but can’t TX.
    It seems I’ll sent it to lab.
    Thanks for support.


  16. Jay, thank you so much for your help on the 450D last week. I’m not sure I could have done it had it not been for your guidance. I am up and running, and a not on the radio says something like “stay away, very far away”. Thanks again for your tech help, it was a Godsend.

    Round Rock, TX

  17. Thanks loads for the help last week. Sorry TO take up your time, but not sure I could have done what you did in a month. I appreciate your time and guidance. There is now a sign on the radio saying “DO NOT TOUCH, STAY AWAY, VERY FAR AWAY”.

Leave a Reply

Your email address will not be published.


This site uses Akismet to reduce spam. Learn how your comment data is processed.