QRP Labs QMX User Manual

2. Connectors
This is the QMX left panel.
Paddle connector
The paddle connector is a 3.5mm stereo jack socket and actually has THREE purposes:
1) Paddle for CW operation
Don’t worry if your paddle has a reversed pinout, or if you connect the dit and dah to a 3.5mm jack
plug incorrectly: there is a configuration item in the configuration menu (CW Keyer menu) allowing
you to swap the dit and dah in the firmware.
2) GPS interface
Here the 1pps signal from the GPS must be connected to the 3.5mm jack “tip” connection, and the
serial data (9600 baud) to the “ring” connection. In QMX these signals are 3.3V logic level;
however they are connected to 5V-tolerant I/O pins on the microcontroller so 5V logic level will
also work fine. If you are using a GPS module directly, and it has the common 2.8V output logic,
this will also work fine.
QMX operang manual; rmware 1_00_012 7

QRP Labs QMX Specifications

General

Brand	QRP Labs
Model	QMX
Category	Transceiver
Language	English

Summary

1. Overview of Features

QMX Portability

Highlights the small size and low current consumption for portable operations.

Synthesised VFO Tuning

Details the VFO tuning using a Si5351A chip and rotary encoder, with two VFOs.

CW Keyer and Break-in

Explains the integrated lambic keyer and full/semi break-in operation.

2. Connectors

Paddle Connector Functions

Details the 3.5mm stereo jack for paddle, GPS data, and microphone input.

Audio and DC Power Connectors

Describes the 3.5mm audio output and 2.1mm barrel jack DC input.

3. Display Elements

4. Operator Controls

4.1 Tune Rate

Explains how to adjust the VFO tuning rate using the rotary encoder.

4.2 Keyer Speed

Details how to adjust the CW keyer speed using the 'Select' button and encoder.

4.3 RIT

Explains how to adjust Receiver Incremental Tuning (RIT) using double-click and encoder.

4.4 VFO Mode

Describes selecting between VFO A, VFO B, and Split modes for operation.

5. Menu System

5.1 Saving Current Operating Parameters

Stores current operating conditions like VFO frequency, mode, and keyer speed upon power down.

5.3 Editing Configuration Parameters

Details the process of editing menu parameters using the rotary encoder and buttons.

5.8 Audio Menu

Controls audio settings like volume step and sidetone volume and its absolute/relative mode.

5.11 Keyer Menu

Configures CW keyer settings like mode, swap, weight, and auto-space.

5.16 Protection Menu

Configures protection features like SWR protection, threshold, and supply voltage monitoring.

5.19 Factory Reset

Resets the radio to its default factory configuration, erasing all custom settings.

5.20 Update Firmware

Guides the user through rebooting into bootloader mode for firmware updates via USB.

6. Operating QMX on Digital Modes

WSJT-X Configuration

Step-by-step guide for configuring WSJT-X for audio and CAT control with QMX.

7. Firmware Update Procedure

Entering Bootloader Mode

Explains methods to enter firmware update mode, including button presses and jumpers.

8. Terminal Applications

PC Terminal Emulator Setup

Guides setting up terminal emulators like PuTTY for connecting to QMX.

8.5 Band Configuration

Details configuring parameters for each amateur radio band, including frequencies and PTT.

8.6 Hardware Tests Menu

Accesses tools for optimizing and testing hardware, including filter sweeps and diagnostics.

8.7 PC and CAT Menu

Covers PC interface and CAT commands, including system config and input analysis.

9. Resources

10. Document Revision History