6. Operating QMX on digital modes
Operation of the QMX transceiver on digital modes is really simple. A USB-C cable is required
between the PC and the QMX. Naturally you need a power supply and the antenna connection
too.
QMX must be set to Digital mode, to be able to use the PC and QMX combination for digital
modes! Press the VOL knob to change the mode on QMX.
Drivers
The QMX audio device (USB soundcard) is standard on all PC types (Linux, Windows, Mac) and
no additional drivers are required.
For the Virtual COM serial port, no additional drivers are required for operation with most Linux
distributions, Apple Mac or MS Windows 10 or Windows 11.
For older versions of MS Windows, it may be necessary to install a driver for the serial port
because this driver is not on your computer already by default. This driver is available from the ST
Semiconductor website at https://www.st.com/en/development-tools/stsw-stm32102.html and is
applicable to 98SE, 2000, XP, Vista®, 7, and 8.x Operating Systems. There is a description for
installation on Windows 7/8 on the QRP Labs QLG2 page http://qrp-labs.com/qlg2 so if in doubt,
please check this.
Linux special note
On Linux systems, a particular problem can occur. When the QMX Virtual COM (Serial)
connection is detected, the PC thinks that a modem has been connected and starts trying to send
it Hayes AT-commands dating back to 1981, implemented on Hayes’ 300-baud modem. Yes! 40
years ago…
The Operating System attempting to send AT commands to your QMX will certainly mess
everything up. Not least because when QMX receives a carriage return character, it will enter
Terminal Applications mode; this will send all sorts of characters back to the PC (as QMX thinks it
is now talking to a terminal emulator) and it will disable CAT command processing, so your PC digi
modes software will not be able to talk to QMX. Disaster.
To fix this you need to issue the following commands to disable ModemManager:
sudo systemctl stop ModemManager
sudo systemctl disable ModemManager
sudo systemctl mask ModemManager
This will permanently stop ModemManager. If for some reason, you actually DO need
ModemManager operational, for some other reason… well there IS a way to stop it just for QMX…
but Google will be your elmer on this!
Additional information from Greg Majewski:
There is another Linux service, BRITTY, that does the same. BRITTY is a Braille service for
access by sight impaired people. I have encountered the problem with the G90 and Ubuntu on a
QMX operang manual; rmware 1_00_012 49
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