The "QMX+" (QRP+ Labs Multimode Xcvr): a feature-packed, high performance, 160-6m 3-5W CW and Digi-modes transceiver kit, including embedded SDR receiver, 24-bit 48 ksps USB sound card, CAT control, synthesized VFO with TCXO reference, CR2032 battery backed RTC, and internal GPS option. QMX+ may be used in CW modes standalone, or with a single USB cable to a PC for digi mode operation. QMX+ also incorporates standalone CW, FSKCW and WSPR beacon functionality (no PC connection required).
QMX+ shares most of its schematic, features and performance with QMX. QMX+ and QMX run the same firmware file. But QMX+ has a larger, easier-to-build format with a QCX+ style enclosure, with plenty of space for modifications and a Dev board kit to help get you started. It has a CR2032 battery-backed Real Time Clock (battery not included) and an internal optional GPS QLG3.
QMX+ transmits a SINGLE SIGNAL on FSK signal modes, it is not an SSB modulator with associated unwanted sideband and residual carrier, or intermodulation due to amplifier non-linearity. QMX+ outputs a pure single signal. QMX+ is, in the first firmware releases, suitable only for CW and single tone FSK modes, which covers the majority of digital modes in use today. This includes everything in WSJT-X, JS8Call, some fldigi modes e.g. RTTY, Olivia and more. QMX+ is not yet suitable for phase shift keyed modes such as PSK31 or modes involving multiple concurrent tones such as WinLink (a later SSB firmware release will enable this).
The Optional enclosure is black anodized extruded aluminium, very sturdy and elegant. The enclosure size is 106 x 55 x 146mm deep without protrusions (knobs and connectors). The front and rear panels are drilled and cut to match the QMX+ PCB with laser-etched lettering. The enclosure includes four self-adhesive feet and end panel securing screws.
Note that the included SMPS boards are also available separately in the spare parts section of the QRP Labs shop.
QMX+ is available in kit or assembled versions.
List of features:
- Full 160m to 6m band coverage
- CW and FSK Digi modes (SSB in future firmware release)
- All features of QCX+ (VFO A/B/Split, RIT, Message and frequency memories, beacon, keyer, etc)
- 3-5W output at 12V supply (can be built for 3-5W at 9V supply)
- SWR bridge built in
- Internal RTC powered by the common CR2032 coin cell battery (battery not included)
- Single signal digi mode transmission (zero unwanted sideband, zero residual carrier, zero intermodulation distortion)
- Solid-state band switching and transmit/receive switching under CAT control
- High performance embedded SDR SSB receiver with 60-70dB of unwanted sideband cancellation
- Built-in 24-bit 48ksps USB sound card
- Built-in USB Virtual COM Serial port for CAT control
- Si5351A Synthesized VFO with 25MHz TCXO as standard
- Easy to build single-board design, Professional quality 6-layer, through-hole plated, silk-screen printed PCBs
- All SMD components factory assembled
- Connectors: 2.1mm power barrel connector, USB-C (for audio and CAT control), BNC RF input/output, 3.5mm jacks for audio out, paddle/GPS/mic/PTT in, and PTT out
- Built-in test signal generator and testing tools
- GPS interface for frequency calibration, real time clock and location (internal WSPR beacon)
- IQ output mode for use with SDR software
- Switched mode regulators Receive current 80mA, Transmit current 1.0-1.1A for 5W output with 9V supply (around 0.7A for 5W with 12V supply).
- Internal microphone ready for the future SSB firmware
- 11 GPIO ports including a 3.5mm stereo jack socket on the rear panel labelled "AUX" that may be configured as a serial port
- Optional aluminium extruded cut/drilled/laser-etched black anodized enclosure
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