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When I power up my low-band QMX, put it into DiGi mode, then start WSJT-X in FT8 mode, I get tons of decodes.

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If I then enable transmit, it will transmit with about 3.5 watts on 20m and my signal, as reported by pskreporter.info, covers the entire United States (at least today).

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However, after that first transmission my decodes stop.? Even though the QMX is still in DiGi mode, I can no longer hear FT8 stations.?

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If I then put the QMX into USB mode then I can hear lots of FT8 stations and decoding resumes, but as soon as WSJT transmits it puts the QMX back into DiGi mode, I can no longer hear FT8 stations, and the decoding stops.? My transmitted signal continues to be heard throughout the United States.

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Any suggestions as to what I'm doing wrong?

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Best,

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Jim / K8DDV

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I have not experienced this. Thats a strange one!

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Have you tried a ferrite bead on your USB cable or a different mfger cable? I have a ferrite clip on bead on my cable as a preventative measure.

Good suggestion, but after replacing the USB cable with one that has two ferrites, I see the same behavior.

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I'm running Windows 10 and I just noticed that the sound card shows as a QDX, not a QMX.? For those of you on Windows, does yours show QDX or QMX?? I have a few QDXs and have used them on this PC before, but why it still says QDX I have no idea and non idea how to get it to show QMX.? Checking w/Grok ...

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Jim / K8DDV

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It's fixed!

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First, the problem with the QMX driver not showing up.? I was able to get the QMX to show under Soundcard Input and Output devices by:

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1. Turn of QMX.

2. Go to Device Manager and removing the QDX driver.

3. Power up the QMX and Windows automatically found it.

4. Go back into WSJT-X, go into Settings, Audio, and there are the QMX drivers.

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But I still had the the problem where decoding after transmitting no longer works.??

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I fixed it by going into WSJT-X, Settings, Radio tab, and set Mode to "None" (I had it as "Data").? Perhaps Hans should add on page 85 of the QMX manual something to the effect of:

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"Set Mode to “None” to avoid WSJT-X trying to keep changing your mode to SSB (USB); you need to use DiGi mode for WSJT-X (pure FSK modes)."

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Oh, wait, it's already there :-)

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RTFM.??

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Jim

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Jim-

I had the same problem with my QMX+.? It would receive FT8 signals (in digi mode), but as soon as WSJT-x sent any CAT command (such as transmitting or even changing bands) the decodes stopped and the waterfall was quiet.? If I switched to CW mode, it would decode again.? Along the way I discovered that I could get it to decode in digi mode again simply by entering and exiting the QMX menu.

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The problem turned out to be a setting in WSJT-x.? In the "Radio" tab, set "Mode" to "None"; mine was set to "Data/Pkt."? Don't let WSJT-x change the radio's mode; set it to digi yourself using the QMX's controls.??

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After making that change, it's working great- no problems making FT8 contacts or switching between bands.

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One other point that I've discovered; only power up the QMX AFTER WSJT-x has been started.? Otherwise, the QMX goes into "terminal mode" (or whatever it's called), and it won't communicate with WSJT-x.? But if you power up the QMX while WSJT-x is running, it WSJT-x will connect to the QMX and you won't get those annoying "reconfigure" errors.

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Larry

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On Wed, May 7, 2025 at 01:30 PM, Larry- WA2VKG wrote:

In the "Radio" tab, set "Mode" to "None"; mine was set to "Data/Pkt."? Don't let WSJT-x change the radio's mode; set it to digi yourself using the QMX's controls.??

Larry is correct.

This is the answer.

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WSJT-x (actually hamlib) does not use the mode commands correctly for QMX, and for some reason sends a 'lower-sideband digital' code to QMX if you set the mode to "Data/Pkt".? It also uses the vfo a/b incorrectly for split mode.? (I think these are carry-overs from the Kenwood protocol from which the QMX commands were implemented).

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So until this is fixed, you must set the WSJT-X radio "Mode" and "Split" to "none", as illustrated in the QMX operation guide.

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Stan KC7XE

Stan

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