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Help with using SSB Voice Caller Software and the 6400

I have my 6400 in the garage and I am on a computer in my home office. Effectively, I am operating remote from home. I use a USB headset connected to the PC as the speaker and microphone.

What I have determined so far is that DAX must be enabled in order for the Voice Caller in N3FJP to work, and it does work. It also seems that I am not able to transmit on the USB headset microphone while DAX is enabled. This means that in order to effectively use the voice caller I need to flip on DAX, activate the voice call, then flip DAX back off in order to use the microphone again.

Is there a workaround for this? It sure would be nice if MOX would just override the DAX setting when used. Is there a way to send the USB headset microphone audio directly to DAX?


  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    I am not sure if N3FJP sends the correct CAT commands to turn DAX on and off as required. N1MM does it correctly if you want to give it a try.

    Check with the author of N3FJP to send the radio the following commands to the radio.

    The key command is ZZDX1; and ZZDX0; (on and off)


    2021-01-22 09:03:05.952 COM4  [sent]: ZZTX1;   << Radio to TX
    2021-01-22 09:03:05.982 COM4  [sent]: ZZDX;    << query DX setting
    2021-01-22 09:03:05.983 COM4  [rcvd]: ZZDX0;   << answer DAX TX is off
    2021-01-22 09:03:05.988 COM4  [sent]: ZZDX1;   << turn on DAX TX
    2021-01-22 09:03:06.066 COM4  [sent]: ZZMG;    << ask Mic gain
    2021-01-22 09:03:06.068 COM4  [rcvd]: ZZMG066; << set to 66 
    2021-01-22 09:03:06.072 COM4  [sent]: ZZMG000; << set gain to Zero
    message plays
    2021-01-22 09:03:07.402 COM4  [sent]: ZZDX0;   << set TX DAX Off
    2021-01-22 09:03:07.408 COM4  [sent]: ZZMG066; << set Mic Gain to 66 
    2021-01-22 09:03:07.414 COM4  [sent]: ZZTX0;   << move to RX
  • Jeff U.
    Jeff U. Member
    Thanks, this is very helpful. I’ll follow up.

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