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A few years back I built a QRSS transmitter (for slow morse and WSPR) based on a recycled DLink DSL-502T router running OpenWRT and connected to an Si570 DDS module. ( ...
2. SI570 QRSS Beacon
My MEPT QRSS and WSPR beacon is controlled by a DLink DSL-502T running OpenWRT. The QRSS and WSPR messages are generated by directly controlling the frequency of an Si570 chip.  The interface ...

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