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QMX and SDR++ on GNU/Linux
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Hi, I tried to use QMX as SDR receiver, however it shows up as Audio ALSA or PulseAudio server of which neither I use. Has anyone recorded steps how to set this up with something like GQRC or less buggy than SDR++ software? There are so many issues with SDR++ I don't know where to begin with. Digital interface seems to be showing up in Helvum and Gnome settings so it's probably something with the SDR app itself ? Secondly, it works as audio with ALSA but sounds terrible. Is it because it's not really using IQ which I enabled in software? By the way enabling or disabling that on QMX does not change anything to visible devices in dmesg. Is that expected? Regards |
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I can't fully answer your question, since I don't currently have a linux box set up for use with my QMX - but regarding the last part of your question on the I/Q mode:? The QMX gives (and uses internally) true I/Q data.? I have used it with two different Windows SDR apps, and the audio produced sounds great in SSB, Digital, and CW.? So there must be some issue with your particular setup if you are getting terrible audio.
Stan KC7XE |
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If anyone has a good guide on how to set it up with SDR++ that would be awesome On Thu, Dec 26, 2024, 12:29?PM Stan Dye via <standye=[email protected]> wrote:
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So what I did I downloaded nightly build of SDR++, enabled IQ in the QMX submenu of Digi interface (but enabling disabling didnt make any difference) and selected Audio source in the SDR++. However for me there is only ALSA and PulseAudio option to choose from, I use neither of these (it's a PipeWire system) and on the YouTube this showed up for someone who got it working properly as Digital Sound Interface 2 - QMX, that's not the case for me. Is there any way to check that it's SDR++ fault and not QMX fault? Also I would really love to see this working with some other SDR software like GQRX which has less bugs. Help apprechiated.
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If you're familiar with the Python programming language, you might try tinkering with some
programs I wrote a couple of years ago for the QDX.? I haven't built my QMX+ yet, so I don't
know for a fact that the software will work with the QMX.? In any case, it consists of two
Python scripts, one which just directly streams the QDX's internal SDR to Linux and the
other which provides a UI to set the frequency, sideband, and volume.? It's available
at .
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I'd be interested to know if it works with the QMX.
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Cheers -
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Bruce K1FFX
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Yes, I tried that and different orders as well. dmesg shows [ ? ?8.418077] usbcore: registered new interface driver snd-usb-audio ... [ ? 45.132326] usb 1-4: USB disconnect, device number 4 [ ? 46.522527] usb 1-4: new full-speed USB device number 10 using xhci_hcd [ ? 46.665037] usb 1-4: New USB device found, idVendor=0483, idProduct=a34c, bcdDevice= 1.00 [ ? 46.665040] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ ? 46.665041] usb 1-4: Product: QMX Transceiver [ ? 46.665042] usb 1-4: Manufacturer: QRP Labs [ ? 46.667477] cdc_acm 1-4:1.0: ttyACM0: USB ACM device lsusb shows Bus 001 Device 010: ID 0483:a34c STMicroelectronics QMX Transceiver Changing in QMX->Digi Interface->IQ from Enabled to Disabled or other way around does not change anything when it comes to devices in dmesg or lsusb. I think it's seen as an Audio device and not a digital audio interface and this is a problem. This video shows? that it should show up as Digital Audio Interface, which is not the case for me. Am I correct about this ? My audio quality or waterfall is nowhere near the look on that Youtube video. On Thu, Dec 26, 2024 at 10:54?PM Stan Dye via <standye=[email protected]> wrote:
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