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Hello, I just built a QMX+, the controls on the device work, but I couldn't test it fully because I don't have an HF antenna in my workshop. When I wanted to test it by connecting it to my computer, I found that the USB connection doesn't work, when I plug in the cable my computer doesn't react at all, there is no warning like "device unknown", it's as if the cable was never plugged in. Then I started searching the group posts and double-checked the items I wrote below,

- I am sure that the cable I am using is suitable for data transmission
- It was written that the smd mount USB-c connector sometimes has soldering errors, I made sure it was soldered correctly,
- I have checked the 2 lines coming out of the USB-c connector and going to the microcontroller and they look healthy,

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I am using windows 11 operating system, I don't have access to an older version of windows or linux distro for now but I will try them.

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Many thanks in advance for your help on the subject.
TA2KTK - Tayfun

Tayfun,

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Often Windows will not make a sound at all when you plug in the QMX+ correctly, because it uses the same USB virtual serial port we use on other devices, and it already has the driver installed and ready.

Follow this procedure, starting with your QMX+ not plugged in to the computer:

1) In Windows 11, bring up "Device Manager" (right-click on the windows start icon, and there is a selection for it).? In Device Manager, if there is a selection for "Ports (COM & LPT)", expand it and see what devices are present.? If there is no such selection, it's ok, you don't have any currently active.

2) Now with QMX+ power off, plug in the USB data cable to QMX+ and PC.

3) Now power on the QMX+ while watching the Device Manager window.

A new device should appear within a few seconds under "Ports (COM & LPT)", and if that ports selection wasn't there before, it should appear with one entry.

This new entry is your QMX+ - note the com port number it is using so you can use it with PuTTY or TeraTerm or whatever terminal emulator you will use.

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A key here is that QMX+ only initializes its USB port when it powers on, and only IF it sees that the cable is plugged in.? So you need to power it on, or power-cycle it AFTER you plug in the cable in order for the computer to recognize it.

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I hope this helps.? There is not a lot that can go wrong in the QMX+ hardware, since there isn't much, as you have seen.? Just a couple of wires and resistors, leading into processor pins.? So usually it is something related to the connection or startup procedure.? Win11 has all the necessary drivers pre-installed, so it should be ready to go unless you have done some specific driver unloading.

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Stan KC7XE

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An update, as always I think the problem is the simplest one, I have type-c to type-c cables, I couldn't get any response from any type-c port of the computer I was using, then I tried the type-a ports on my motherboard using a type-c to type-a converter, I could only get response from the usb2.0 usb port, it shows the device for 2-3 seconds, but then it keeps beeping as "unknown device", the solution is to buy a relatively older type-c to type-a cable and try the usb2.0 ports again, if not, try again on an older generation computer, try and try and try... I guess that's the fun of it :)

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I'll write again with the latest situation, 73.

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TA2KTK - Tayfun

Yup, never been able to use straight c to c... I think it's missing a resistor to tell the computer to just treat it like a basic USB device. Whenever I have used it on my USB c laptop I have had to use an OTG adapter and a USB c to USB a cable.

On Tue, Jan 7, 2025 at 07:34 PM, Sean [AK6BM] wrote:

never been able to use straight c to c... I think it's missing a resistor to tell the computer to just treat it like a basic USB device

This was a problem with the early QMX boards, as you say missing resistors.? It was fixed in later QMX board versions and the QMX+ and by a number of people who fitted the resistors.? When you do that you can use USB C to C cables.

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The OP says QMX+ so this isn't the problem for him.

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Chris, G5CTH

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Hello again, last time I thought that the problem might be in the new generation cables with PD support, so I bought 3 different brands of type-C to type-A cables with data transfer feature and working in USB2 standard, when I plugged in the first cable, the device connected and when it showed as Com-3 I thought the problem was solved, but while browsing the hardware monitor, the breaks started again, the same problem with all 3 cables...

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I decided to renew the soldering of the smd USB C connector on the board, which I had already checked by checking for short circuits (those who make this decision know that the moment your hands shake is the moment you are finished...). With all prayers I was able to re-solder it without any problem, and bingo! For now the problem seems to be solved, I have been testing for 2-3 hours and so far so good.

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Now that we've identified the problem, it's time to go back and test other cables and USB ports, all the cables I had worked on all ports, type-C, A... If you are experiencing similar symptoms I hope these articles will help you... Sincerely 73.

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TA2KTK - Tayfun