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Looks ok to me.

Sorry, I can't help much more. Is the waterfall display showing anything?

Maybe time to start checking the receive signal path back from the antenna socket.

Roger

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No.

But what do you have the audio devices set as, in WSJT-X? Should be something like QDX-input, QDX-output. (Use F2 to go to settings, then the Audio tab).

Roger

But would that explain why the QDX is not hearing anything? I do have the output and input devices set in my audio settings to 100%

Wayne

Hi All,

My QMX had the short between Q103/Q104 which was discovered before powering it up.

The AOD403 was replaced as the original one fractured with modest pressure applied with the heatgun.

The QMX was powered up tonight with 7V on a current limited supply to 250mA output.??
Current draw is about 200mA when power applied without switching the unit on.? The display is blank.??
Has this happened to anyone else???

Cheers,
Glenn VK3YY.

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From page 10 of the manual:

LED flashes 2 times in quick succession, repeating every 1 second: the PC host software
application is sending audio to QDX, and QDX is detecting and measuring the incoming
audio, however the volume is too low

Roger

OK...now I am getting two flashes on the LED. I am still not getting any audio in or out, however.

Wayne

Thanks for the reply. I did forget to mention my power slider is set to max. The problem I am having is the QDX has no audio in or out. Also, I just noticed this error as I continued to troubleshoot:

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Do you have the power slider in WSJT-X set to maximum? It needs to be at max for the QDX to work.

Roger

8P6RX

I submitted a previous topic regarding the audio migration settings. That may not be the problem. I finished my QDX build and am now trying to get it to operate. It comes on just fine and I updated the firmware to 1.10. Cat control is fine, as well. The problem I am having seems to be with the audio. My QDX is not hearing anything nor does it transmit. When I place the QDX, I get just a single flash of the LED. I l found in the operations manual this means my QDX is not receiving any audio. I did check the WSJT-X settings and QDX is set as my input and output. It also appears the audio configuration on my computer (win11) shows full levels for the QDX input and output. I've changed USB cables, but that didn't fix anything. So, what is my next troubleshooting step?

Thanks,
Wayne KB4DSF

Lex,?

A relatively simple version of CAT and Audio interface bundled in one:

73

Barb WB2CBA

I finished my QDX build. After hooking up to an antenna, I am finding my QDX is not receiving nor transmitting. It seems i may have a sound card problem. I checked the audio devices and I beleive I am having an issue with the device migrating:


Any thoughts?

Thanks,
Wayne KB4DSF

Hello all.

Is there a way to simplify the OCXO adjustment if a thermometer (having a miniature probe) is available?

Is there a way to simplify the OCXO adjustment if a drift-free reference receiver (as obviously assumed) is not available?

Greetings
Jens

Hi Razvan

Thanks for your input - I meant only to rig up temporary linear supplies on my bench to check through the main-board, not as a permanent change
The plan is :

• Remove both SMPS boards
• Supply +3.3 from linear regulator and check if the CPU runs
• Replace the 3.3V SMPS/linear regulator board and supply +12V from linear supply, check CPU again
• If all good, repair or replace the 5V SMPS board

Regards
Rick

Regards
Rick

Roger, I've been through the connections with a fine tooth comb, but no harm in doing it again., but it would be nice to know if "transmit enabled" should be permanently showing, as in my case, doesn't seem right.

Paul DJ0CU?

Important note : I know Hans is a very busy man doing great stuff for us, but the idea below came to mind this morning and had to write it down.

?

Not just owning QRP-Labs rigs?I have made my fair share of digimode and CAT interfaces for my other rigs.?

But playing with my QMX for a few days new and loving the single USB cable solution, the idea came to mind that it would be great to have a single USB cable digimode / cat interface for my other rigs.

And looking at the QMX and QDX basically everything is there :

• Built-in 24-bit 48ksps USB sound card (much better than most other USB sound cards)
• Built-in USB Virtual COM Serial port for CAT control (you could have one to configure the interface and one to pass through the rig).?
• The USB could be able to power the MCU etc.

Only thing missing is some good isolation for the audio and CAT signal lines, and a connector to which these signal lines would be available to the outside world.

If it would exist, I would immediately buy a 2 for my rigs.?

Just a though. And again, see?Important note?above.

--

73 Lex PH2LB?

Short form:
- QMX ordered
- waited ( waited, waited, waited patiently)
- built, => firmware installed, => turned on, => running.

Once again confirmed, the kits from QRPlabs are great.
To fit so much RF technology into such a small space is quite a challenge.
Even for the experienced solderer.
But it is exactly as described in the assembly instructions in many places: Read carefully, some things twice, look closely with a magnifying glass, and take your time.
I took my time, but nevertheless I was done with the soldering after about 15 hours.
The installation of the firmware is really very simple. I only had to get a USB C cable.
7 Volt, 250 mA, take a deep breath and....
no smoke, no smell, everything wonderful, the little wonder box is running.
Antenna on and immediately signals on the 40m band.
Now the installation in the enclosure takes place.
Fine thing.

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Like you posted.

Thinking a bit more the things involved in Rx but not Tx are the band pass filter components L401 and it's associated capacitors and the trifilar transformer T401.

The sweeps in the diagnostics are useful to check, if they are all giving a low max value that's an indication of a lack of connection.? Check the soldering of the toroids, everywhere, it's very easy to fail to get the enamel off.? I had this and redoing the soldering fixed it.

Chris, G5CTH