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jeremy, you should check for continuity between IC2 Pins 2,3,4,5,6 & 27 to LCD pins 11,12,13,14,6 & 4 respectively.? If any are missing check soldering on the LCD, IC2 socket, and pins and sockets on the connectors between the main board and the display board. Those board interconnections are where most of the soldering issues occur. Good luck ... Ron

Angelo,

There are a number of different factories that produce microphones for Baofengs.? I have bought 6 of them so far and everyone is made differently. I had one that didn't work at all on the QMX, so I got the mic element from DigiKey that Hans mentioned on the QRP Labs website, and replaced the one in the Baofeng mic with it. I found that another Baofeng mic worked just as well as that mic element from DigiKey. I did have to cut off the connector and rewire a new stereo connector, so the ring to ground is the mic connection, and the tip to ground is the PTT connection. I just isolated the speaker wires and I'm not using the speaker. It is only 8 ohms anyway and the QMXs work better with at least 32 ohms.

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73, Dan - W2DLC

I haven't changed anything from the defaults that were in the firmware when Hans sent it out. It seems to work well with my mic just as it was.

Hi Sameer,

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You can use portaudio for streaming IQ samples from QMX on macOS. Just use homebrew to install it. I used portaudio to implement an extio shim layer for N1MM Logger+ on Windows. The portaudio code in it would work on macOS as well.

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73 Zhenxing N6HAN

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If you configure your QMX to IQ output then the I and Q channels are output in the QMX sound card to your computer via the USB connection.

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Personally I use GNU Radio Companion to build signal processing pipelines to play with the output ? ; all the building blocks are there and numerous output GUIs etc.? You can also pipe it into SDR received software.

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73 Simon G0FOZ

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Further to Stan's comments, The items that I repeatedly access are the Tune function and the CW filter bandwidth. It would be great to have quick access to these. Also to be able to change band down one (or more) without scrolling up through all of the bands, particularly on QMX+ Not urgent, but aspirational for the future.

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I just had a great time with my QMX+ while on holiday on Mallorca. Many thanks Hans, and team, for such a fun radio!

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73

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Ellis

GM4GZW

I would love to be able to receive IQ signals stream from USB on my Mac to a file handle in C where I can try all the DSP techniques.

Coding is nonissue but Don’t know how to get that first step working to get the stream of bytes/ints

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ANy help is appreciated?

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73s,
AA6ST
Sameer

WSJTX via cat, win 11 latest, using single or two ports (putty on 2nd cat mon) does not matter. Turned off USB power management on all "hubs" in Device manager no change. Repeatable.

I am using a Retevis HK008 that I was using for TruSDX previously. It has an integrated speaker that sounds very good.

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I had to cut and rewire the plug. I don't know how good it sounds on the air, but I made already a bunch of ssb contacts with 5w and no one complained about the audio.

Erik, what mic Gain and Compression settings seem to work best???

-Bill

The Four State QRP Group tuner (by David Cripe NM0S) works very well when I need it.

YES, it is a kit, and YES, I'm old too. Yet it was a very easy build.

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72 de N4REE, Bob Easton - QRP CW forever

I think it's a good recommendation.
The new release 1_01_004 works perfectly for me on Windows 11 Pro.
The USB audio is very limited. I fix this with the "Voice-Meter" program, which allows me to increase the USB volume by approximately 5 to 10 dB.

Thanks?

Miguel EC7ZV

Hello! Just wanted to describe the situation with my QMX. I've installed the latest beta 04.

?1. Win 10 laptop has found three COM ports without problem. WJST-X and JS8-Call work fine. WinLink/VARA works OK except one problem: during TX QMX receive very low audio signal via USB cable. So it doesn't transmit any material signal. That is why I have to use speakerphone in VARA soundcard settings for output signal instead. Then everything is OK.?

2. Win 8 tablet with 8" screen. Had to install STM driver and manually "show" to the system where to find drivers for all three COM ports and all three QMX devices that the system saw at the beginning. After that it started to see three new COM ports and one audio device named QMX. Exactly as it is with Win 10 laptop. So I was sure that now everything should be OK. BUT it is not. WJST-X and JS8-Call doesn't work. No CAT control. In spite of the fact that all settings are exactly the same as for Win 10. WinLink/Vara works but with slightly different settings than Win 10 laptop. And it has the same problem with very low audio signal via USB cable. So I use speakerphone in VARA soundcard settings for output signal as well. But at least WinLink works...

Hans, is it possible to make some audio input signal (through USB cable) regulation in menu? In future firmware updates? Or may be you can reproduce this problem with input signal strength and find the solution?

Thanks!

Sergey

UB3AZK

Menu

hardware tests

Swr tune

One more press for go. Puts out the tune carrier for i think 30 seconds.

Roger

Get

I use the same LDG817. I use swr tune mode on my QMX+, and push and hold the tune button on the LDG until the red light goes out, then release. (I.e. a full tune from scratch every time). Works fine.

73

Roger

8P6RX

Get

On Thu, Apr 24, 2025 at 10:42 AM, Richard Dyer wrote:

I have windows 11 fw004 and everything is working great except about every 10 minutes Win11 drops all three com ports like clockwork.

I'm seeing this as well, just connecting the terminal and leaving it passive is enough to generate this.? My system details:

Edition ? ?Windows 11 Home
Version ? ?24H2
Installed on ? ??15/?02/?2025
OS build ? ?26100.3775
Experience ? ?Windows Feature Experience Pack 1000.26100.66.0

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Hope this helps,

Chris, G5CTH

So this indicates the LCD is receiving nothing at start up

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Unsoldered /shorted ?connections, ?CPU absent, CPU wrong way round, pins folded underneath etc are all worth checking?

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Have you read the troubleshooting guide on the units webpages ??

Photo of the QMX working ZL from VK3.

I've put a bolt on battery box and speaker amplifier on the QMX.? It screws on to the extrusion where the end plate was.

Glenn VK3YY.