serial terminal interface. There are additional serial ports which may be enabled at a later time
(firmware enhancement). The complete configuration menu is from the terminal too. Alignment
tools include an RF sweep tool which uses the QMX’ own internal signal generator injected into
the RF port, to sweep across the band pass filters so you can check whether the performance is
optimal and make adjustments if desired.
GPS Interface
The QMX kit has a GPS interface, which is used for calibration, setting the real time clock, and for
frequency and time discipline and locator setting during WSPR operation. The GPS interface
(1pps and 9600 baud serial data) shares the same pins as the paddle dit and dah signals
(necessary due to limited processor I/O). The style of this interface is the same as the earlier
QCX-series CW transceiver kits.
The GPS should only be connected during calibration functions or when the beacon is enabled.
Connection at other times puts the radio into practice mode (no RF emitted) to protect the PA. You
may temporarily connect the GPS while in ordinary operation mode, for the purposes of setting the
real time clock.
QRP Labs Firmware Update
A special feature of QRP Labs kits based on STM32-series microcontrollers is the QRP Labs
Firmware Update procedure (QFU). In firmware update mode, the radio appears to a USB-
connected PC as a USB Flash drive. Updating the firmware is a simple matter of downloading the
new firmware file, unzipping it, and copying it into QMX. Firmware updates will always be free.
They will deliver performance and functionality enhancements and bug fixes.
ASSEMBLY
Assembly of the transceiver is covered in a separate document.
Note: QMX PCB Rev 2 should be used with firmware 1_00_011 and above.
This document describes operation of QMX, and applies to the firmware version specified. This
manual will get you started with QMX, either as a standalone CW transceiver or with your WSJT-X
or other digi modes software in minutes.
PLEASE READ THE BASIC ASSEMBLY AND USE INSTRUCTIONS IN
THIS MANUAL VERY CAREFULLY BEFORE APPLYING POWER TO
THE BOARD!
QMX operang manual; rmware 1_00_012 6
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