QMX Labs QMX SDR Transceiver

This primer considers QMX Labs QMX SDR Transceiver, the ideal radio for Low-Power QRP work.

Layout

There are four devices on the front of the radio: two knobs (VOL and TUNE) and two buttons. For these descriptions, we refer to:

• Left Knob: VOL
• Left Button: Menu, RIT and Keyer
• Right Button: A<->B, Preset, VFO A/B
• Right Knob: TUNE

Basic Operation Procedure

• Power Up: Hold Left Knob for a few seconds.
• Switch Modes: Short press the Left Knob to scroll through CW or DiGi modes.
• Switch Bands: Short double press the Left Knob to scroll between bands: 3.5 MHz (80 m), 5.3 MHz (60 m), 7 MHz (40 m), 10 MHz (30 m), 14 MHz (20 m).
• Adjust Frequency: Single click the Right Knob to move the cursor along the digits. Rotate the Right Knob to adjust the numerals.

Check the antenna Standing Wave Ratio (SWR)

1. Hold the Left Button for a few seconds until a menu appears (e.g., “Audio”).
2. Rotate the Right Knob to the Hardware tests option.
3. Press the Left Button to reach Tune SWR.
4. Press it again to see the SWR: menu, then press it once more to activate the SWR test on low power. (Ensure SWR is below 1.5).
5. Press the Right Button three times to return to the main screen.

Programme a CW Message

1. Hold the Left Button for a few seconds until the menu appears.
2. Rotate the Right Knob to the Messages option.
3. Press the Left Button to enter, then rotate the Right Knob to choose one of the 12 memories.
4. Press the Left Button to edit; an underline cursor will appear.
5. Use the Right Knob to select letters/numbers. Use the arrow characters (→←) to move the cursor forward or backward.
6. When finished, press the Right Button twice to return to the main screen.

Send a Stored Message

• Select: Double click the Right Knob and rotate it to scroll through messages.
• Send: Press the Left Button to transmit.
• Stop: Press the Right Button to stop sending.

Turn off Radio

Hold the Left Knob for a few seconds and the radio will shutdown.

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