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I could not find any information in the archives on GPS modules compatible with QMX, so I decided to give a €6 module I got from a local supplier a try ¨C successfully. That enables convenient use of QMX as a WSPR beacon, as there is no need to worry about setting the time on each power-up. The module referenced as GY-NEO6MV2 is based on the uBlox NEO-6M receiver and can sourced from a variety of sellers.?

The uBlox chip works at 3.3V logic, however, the module hosts an on-board regulator and can be powered via a 5V USB supply with the current draw of about ~60 to 90 mA. There is also a backup battery to keep satellite data (and RTC?). The default baud rate is what QMX expects (9600bps). On the mechanical side, the VCC, TX, and GND are exposed as a pin header and the PPS signal needs to be tapped from pin 3 of uBlox. There is a GPS fix indicator LED connected to that pin via a resistor as well. On my board, screw holes were not connected to the ground, so I soldered a goldpin connector to the edge of the closest one in order to mechanically strengthen the PPS tap and be able to disconnect if needed. I tapped the PPS signal from the nearby resistor as that was the closest to the extra connector. Note that there may be some variations and clones on the market, so I¡¯d recommend checking for continuity between the hole and the ground before you try. The only thing left was to connect the module to a 5V power supply and a 3.5mm jack according to the QMX documentation (Tip = PPS, Ring = TX on the module, Sleeve = Ground).?

Finally, here is a screenshot from the GPS Viewer terminal app.

73,

Kamil