QRP Labs QMX Transceiver

About the QMX

The QRP Labs QMX is a versatile and portable transceiver kit designed for amateur radio enthusiasts. It features a sophisticated Software Defined Radio (SDR) receiver and a 32-bit ARM Cortex M4 microcontroller, offering a wide range of functionalities for both CW and digital mode operations.

Key Features

• Portability: Compact size and low current consumption make it ideal for portable operations like SOTA (Summits on the Air) and POTA (Parks on the Air).
• Versatile Operation: Can be used as a standalone CW transceiver or as a Digimodes modem when connected to a PC.
• Synthesized VFO: Features a Si5351A or MS5351M synthesizer chip with a rotary encoder for tuning, offering two VFOs (A and B) and RIT functionality.
• Memory and Messaging: Includes 16 frequency presets and supports storage of 12 messages for automated transmissions.
• CW Keyer: Integrated lambic keyer with adjustable speed and support for various modes.
• Digital Modes: Seamless integration with PC software like WSJT-X for digital mode operation via a USB-C connection, which also provides a high-performance soundcard.
• SWR Measurement: Built-in SWR bridge for monitoring and protection.
• Real-time Clock: Display of current time, which can be set via GPS or manually.

Connectivity

The QMX offers various connectors for peripherals:

• Paddle Connector: For CW paddle input, GPS interface, or microphone and PTT input for SSB mode.
• Audio Connector: For connecting 32-ohm earphones.
• DC Connector: For power input (6.0V to 12.0V).
• RF Connector: A 50-ohm BNC connector for antenna connection.
• PTT Connector: For controlling external amplifiers.
• USB Connector: USB-C for PC connection, firmware updates, and CAT control.

The QMX+ model includes additional connectors for GPS and AUX functions.

Firmware and Updates

The QMX operates on firmware version 1.02_004. QRP Labs provides free firmware updates that enhance performance and add new features. Updates are performed via the USB connection, where the QMX appears as a USB Flash drive.

Resources

For detailed assembly instructions and further information, please refer to the separate assembly document and the official QRP Labs website.

Learn more about the QMX on the QRP Labs website.