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QRP Labs QRSS TX Kit – Dave Richards AA7EE
GitHub - jaesparza/radio-beacon: A multimode radio beacon for QRSS (FSK-CW, CW) and WSPR. Implemented using AD9850 and STM32duino. Repository hosting schematics, software and other implementation notes.
QRSS RECEIVER FOR TWO BANDS
Crossing the pond with 100 milliwatts – NYC Resistor
WA0UWH - Electronics & HAM Radio Blog: Propeller QRSS and OPERA Beacon