Transmit status indication during QMX digital transmissions
The QRP Labs QDX transceiver front panel contains a 3mm red Status LED, which can inform the
operator the status during digital transmissions and firmware update. QMX has no such LED.
However, QMX has an indicator on the top left character of the LCD, under the ‘A’ symbol of VFO
A.
Note that the transceiver must be put into DIGI mode before attempting digital transmissions from
WSJT-X otherwise they’re just ignored.
1. TX status is a single dot:
This means that QMX has been put into transmit mode via an appropriate CAT command from
WSJT-X, however it is not receiving any audio, so there is no RF output. The usual reason for this
is that QMX has not been selected correctly as the output device in the WSJT-X audio settings
screen. Refer to the section above on the audio configuration. The single dot could also mean that
there is no audio because somewhere in your PC sound settings you have MUTE enabled.
2. TX status is two dots:
This means that QMX has been put into transmit mode via an appropriate CAT command, and
that it is receiving audio from the PC; however the audio level is too low, so there is no RF.
Remember that there is a “Rise Threshold” setting in the QMX Configuration terminal application,
which defaults to 80% of maximum value. If the amplitude of the audio sinewave coming from the
PC is less than 80%, key-down will never be triggered.
It is therefore highly recommended to set the audio output level of the PC to 100%. Unfortunately
this simple recommendation can be the cause of great confusion. The exact places to set the
volume varies also depending on the operating system (Windows, Linux, Mac). But in principle
there are THREE places on the PC that all affect the output channel volume, and all three need to
be set to 100%:
1. The output volume of the software application itself, for example the “Pwr” slider in the bottom
right area of the WSJT-X screen; these should always be left at maximum.
2. The output device corresponding to QMX must be set at 100% also. In Linux Sound Manager
(XUbuntu 18.04 example shown), the Output Devices tab for QMX should have its slider set to
100% as per the example below. Don’t set it to more than 100%!
QMX operang manual; rmware 1_00_012 54
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