QRP Labs QMX Transceiver

About the QMX

The QRP Labs QMX is a high-performance, 5 or 6-band multi-mode 5W QRP transceiver kit. It features a sophisticated SDR receiver powered by a 168MHz 32-bit ARM Cortex M4 microcontroller. The firmware continuously expands its capabilities, offering a wide range of functionalities for amateur radio enthusiasts.

Key Features

• Portability: Small size and low current consumption make it ideal for portable operations like SOTA and POTA.
• Versatile Operation: Can be used as a standalone CW transceiver or connected to a PC for digital modes (WSJT-X, etc.) via a single USB-C cable.
• Synthesized VFO: Features a Si5351A or MS5351M synthesizer chip with rotary encoder tuning, supporting two VFOs (A/B), split operation, and RIT.
• Memory Presets: Includes 16 frequency presets for quick access to favorite operating frequencies.
• Message Mode: Supports storage of 12 messages, each up to 50 characters long, for automated transmissions.
• CW Keyer: Integrated lambic keyer with configurable modes (A, B, Ultimatic) and adjustable speed.
• Full/Semi Break-in: Supports both full break-in (QSK) and semi break-in modes.
• CW Decoder: Built-in decoder useful for learning CW or entering text.
• Beacon Mode: Can be configured for CW, FSKCW, or WSPR beacon operation, with optional GPS integration for precise timing and location data.
• SWR Measurement: Integrated SWR bridge for continuous measurement and optional transmit prevention.
• Real-time Clock: Displayable real-time clock, settable manually or via GPS.
• High-Performance Audio: Features a 48ksps 24-bit USB soundcard for lossless audio transfer to/from a PC.
• CAT Control: Supports CAT control commands via a Virtual COM serial port, compatible with logging software and digital mode programs.

Connectivity

The QMX offers various connectors for peripherals:

• Paddle Connector: A 3.5mm stereo jack used for CW paddle, GPS interface, or microphone input.
• Audio Connector: Standard 3.5mm stereo jack for earphones.
• DC Connector: 2.1mm barrel jack for power input (6.0V to 12.0V).
• RF Connector: 50-ohm BNC connector for antenna connection.
• PTT Connector: 3.5mm stereo jack for PTT control of external amplifiers.
• USB Connector: USB-C type for PC connection (sound card, serial port, firmware updates).

The QMX+ model includes additional connectors like a SMA GPS connector and an AUX connector.

Important Notes

• Assembly instructions are provided in a separate document.
• Ensure the correct supply voltage (12.0V recommended) is used.
• Read the manual carefully before applying power to the board.

Further Information

For detailed operational procedures, menu system explanations, and advanced features, please refer to the full operating manual.

Visit QRP Labs for more information and firmware updates.